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Cheap flights from Illinois to Denver (DEN) from $37

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 6/12. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
ORD — DEN
Jun 2 — Jun 91
From?
To?
Sun 6/2
Sun 6/9
1 adult, Economy
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How far in advance should I book a flight from Illinois to Denver?

When searching for a good deal, it’s best to be prepared for potential fluctuations in price. We recommend booking at least 29 days in advance, which can save you up to 37% on flights from Illinois to Denver compared to booking the week you need them. Waiting 29 days out may not be for everyone, so we have options available for flights within the next two weeks, with the lowest price starting at $173. For sooner than that we have options available in the next 3 days from $315.

What is the cheapest month to fly from Illinois to Denver?

April can be a great time to fly to Denver from Illinois with a flight ticket averaging about $191. Cheapflights users have found deals in the month of April for as cheap as $39. The most expensive prices can be found in the month of July.

When is the cheapest time to fly from Illinois to Denver (IL - DEN)?

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Illinois to Denver as you normally would.

Cheap Allegiant Air flights from Illinois to Denver

Explore cheap flight options specifically provided by Allegiant Air for the route between Illinois and Denver. Find affordable fares and compare prices with other airlines to secure the best deal for your journey. Over the last 7 days, Cheapflights users made 2,740,132 searches. Data last updated May 28, 2024.
Take a peek at the cheapest Allegiant Air flights we've detected traveling from Illinois to Denver. Make sure to check back often as deals are often changing.
Fri 8/169:40 amPIA - DEN
Nonstop2h 18mAllegiant Air
Fri 8/2311:48 amDEN - PIA
Nonstop2h 03mAllegiant Air
Deal found 5/27$125
Mon 7/13:36 pmPIA - DEN
Nonstop2h 19mAllegiant Air
Fri 7/55:47 pmDEN - PIA
Nonstop2h 00mAllegiant Air
Deal found 5/27$155
Mon 6/33:43 pmPIA - DEN
Nonstop2h 27mAllegiant Air
Fri 6/145:45 pmDEN - PIA
Nonstop2h 04mAllegiant Air
Deal found 5/27$159
Fri 8/239:40 amPIA - DEN
Nonstop2h 18mAllegiant Air
Mon 8/2611:48 amDEN - PIA
Nonstop2h 03mAllegiant Air
Deal found 5/28$181
Fri 5/313:43 pmPIA - DEN
Nonstop2h 27mAllegiant Air
Mon 6/36:00 pmDEN - PIA
Nonstop2h 02mAllegiant Air
Deal found 5/28$213
Fri 6/73:36 pmPIA - DEN
Nonstop2h 19mAllegiant Air
Fri 6/215:45 pmDEN - PIA
Nonstop2h 04mAllegiant Air
Deal found 5/28$227
Fri 6/143:36 pmPIA - DEN
Nonstop2h 19mAllegiant Air
Fri 6/285:45 pmDEN - PIA
Nonstop2h 04mAllegiant Air
Deal found 5/28$231

Cheap American Airlines flights from Illinois to Denver

Explore cheap flight options specifically provided by American Airlines for the route between Illinois and Denver. Find affordable fares and compare prices with other airlines to secure the best deal for your journey. Over the last 7 days, Cheapflights users made 2,740,132 searches. Data last updated May 28, 2024.
Have a look at some of the cheapest available American Airlines flights departing from Illinois and landing in Denver. Deals are refreshing constantly so come back soon for more options.
Fri 9/137:00 amMLI - DEN
1 stop9h 20mAmerican Airlines
Sun 9/157:01 amDEN - MLI
1 stop7h 58mAmerican Airlines
Deal found 5/27$145
Thu 7/184:28 pmMLI - DEN
1 stop7h 04mAmerican Airlines
Mon 7/229:09 amDEN - MLI
1 stop5h 21mAmerican Airlines
Deal found 5/27$147
Mon 6/33:50 pmMLI - DEN
1 stop8h 12mAmerican Airlines
Sun 6/97:21 amDEN - MLI
1 stop4h 28mAmerican Airlines
Deal found 5/26$148
Tue 10/86:50 amMLI - DEN
1 stop8h 38mAmerican Airlines
Sun 10/205:12 amDEN - MLI
1 stop9h 49mAmerican Airlines
Deal found 5/26$165
Wed 8/149:09 amSTL - DEN
1 stop7h 27mAmerican Airlines
Sat 8/1711:59 pmDEN - STL
1 stop7h 12mAmerican Airlines
Deal found 5/27$195
Tue 6/43:20 pmORD - DEN
1 stop8h 46mAmerican Airlines
Tue 6/119:51 amDEN - ORD
1 stop6h 41mAmerican Airlines
Deal found 5/27$254
Wed 5/294:25 pmPIA - DEN
1 stop7h 41mAmerican Airlines
Wed 6/512:32 pmDEN - PIA
1 stop4h 22mAmerican Airlines
Deal found 5/28$269
Tue 6/43:20 pmORD - DEN
1 stop6h 45mAmerican Airlines
Mon 6/1011:59 pmDEN - ORD
1 stop7h 56mAmerican Airlines
Deal found 5/27$274

Cheap Illinois to Denver flights in May & June 2024

Find cheap flight options from Illinois to Denver specifically for the months of May and June 2024. Explore affordable fares based on user searches. Over the last 7 days, Cheapflights users made 2,740,132 searches. Prices were last updated on May 28, 2024.
The lowest fares we've come across on flights traveling from Illinois to Denver in May and June 2024. Check back in a little while for more flight options.
Thu 6/63:32 pmSTL - DEN
Nonstop2h 29mFrontier
Mon 6/106:20 amDEN - STL
Nonstop2h 09mFrontier
Deal found 5/28$59
Tue 6/186:00 amORD - DEN
Nonstop2h 45mFrontier
Tue 6/259:10 pmDEN - ORD
Nonstop2h 30mFrontier
Deal found 5/27$60
Thu 6/65:01 amMDW - DEN
Nonstop2h 46mFrontier
Tue 6/119:45 amDEN - MDW
Nonstop2h 24mFrontier
Deal found 5/28$60
Sat 6/1510:26 pmMDW - DEN
Nonstop2h 54mFrontier
Wed 6/198:38 amDEN - MDW
Nonstop2h 22mFrontier
Deal found 5/28$64
Wed 6/128:02 pmSTL - DEN
Nonstop2h 30mFrontier
Tue 6/1811:39 amDEN - STL
Nonstop2h 08mFrontier
Deal found 5/28$66
Tue 6/256:00 amORD - DEN
Nonstop2h 45mFrontier
Tue 7/29:10 pmDEN - ORD
Nonstop2h 30mFrontier
Deal found 5/28$67
Tue 6/256:00 amORD - DEN
Nonstop2h 45mFrontier
Tue 7/29:10 pmDEN - ORD
Nonstop2h 30mFrontier
Deal found 5/27$68
Mon 6/38:04 pmSTL - DEN
Nonstop2h 31mFrontier
Thu 6/611:24 amDEN - STL
Nonstop2h 08mFrontier
Deal found 5/28$68
Wed 6/125:55 amMDW - DEN
Nonstop2h 46mFrontier
Wed 6/198:38 amDEN - MDW
Nonstop2h 22mFrontier
Deal found 5/27$68

Illinois to Denver 2024 flight deals

Discover exclusive flight deals for travel between Illinois and Denver in 2024. Find excellent offers based on user searches. Over the last 7 days, Cheapflights users made 2,740,132 searches. Data last updated May 28, 2024.
The lowest fares we've come across on flights traveling from Illinois to Denver in May and June 2024. Check back in a little while for more flight options.
Sat 6/1510:26 pmMDW - DEN
Nonstop2h 54mFrontier
Wed 6/198:38 amDEN - MDW
Nonstop2h 22mFrontier
Deal found 5/28$64
Wed 6/128:02 pmSTL - DEN
Nonstop2h 30mFrontier
Tue 6/1811:39 amDEN - STL
Nonstop2h 08mFrontier
Deal found 5/28$66
Tue 6/256:00 amORD - DEN
Nonstop2h 45mFrontier
Tue 7/29:10 pmDEN - ORD
Nonstop2h 30mFrontier
Deal found 5/28$67
Tue 6/256:00 amORD - DEN
Nonstop2h 45mFrontier
Tue 7/29:10 pmDEN - ORD
Nonstop2h 30mFrontier
Deal found 5/27$68
Mon 6/38:04 pmSTL - DEN
Nonstop2h 31mFrontier
Thu 6/611:24 amDEN - STL
Nonstop2h 08mFrontier
Deal found 5/28$68
Wed 7/106:15 amMDW - DEN
Nonstop2h 41mFrontier
Sat 7/136:34 pmDEN - MDW
Nonstop2h 26mFrontier
Deal found 5/28$68
Thu 6/66:00 amORD - DEN
Nonstop2h 45mFrontier
Wed 6/125:13 pmDEN - ORD
Nonstop2h 35mFrontier
Deal found 5/28$70
Tue 6/186:00 amMDW - DEN
Nonstop2h 44mFrontier
Tue 6/259:45 amDEN - MDW
Nonstop2h 24mFrontier
Deal found 5/27$70
Wed 7/178:02 pmSTL - DEN
Nonstop2h 23mFrontier
Sat 7/206:15 amDEN - STL
Nonstop2h 10mFrontier
Deal found 5/27$71

Non-stop flights to Denver from Illinois

Discover non-stop flight options from Illinois to Denver. Find direct flights with no layovers, providing a convenient travel experience. Explore non-stop flight options based on user searches, and compare prices and availability for your desired travel dates. Over the last 7 days, Cheapflights users made 2,740,132 searches. Data last updated May 28, 2024.
If you're seeking options on non-stop flights from Illinois to Denver, check out these fares. Users seeking other options on flights from Illinois to Denver should update the search form at the top of the page.
Tue 6/116:00 amORD - DEN
Nonstop2h 45mFrontier
Wed 6/125:13 pmDEN - ORD
Nonstop2h 35mFrontier
Deal found 5/28$57
Sat 9/145:56 pmORD - DEN
Nonstop2h 39mFrontier
Wed 9/189:27 pmDEN - ORD
Nonstop2h 36mFrontier
Deal found 5/28$58
Thu 6/63:32 pmSTL - DEN
Nonstop2h 29mFrontier
Thu 6/1311:24 amDEN - STL
Nonstop2h 08mFrontier
Deal found 5/28$58
Thu 6/63:32 pmSTL - DEN
Nonstop2h 29mFrontier
Mon 6/106:20 amDEN - STL
Nonstop2h 09mFrontier
Deal found 5/28$59
Tue 6/186:00 amORD - DEN
Nonstop2h 45mFrontier
Tue 6/259:10 pmDEN - ORD
Nonstop2h 30mFrontier
Deal found 5/27$60
Wed 6/128:02 pmSTL - DEN
Nonstop2h 30mFrontier
Wed 6/196:20 amDEN - STL
Nonstop2h 09mFrontier
Deal found 5/28$61
Sat 6/1510:26 pmMDW - DEN
Nonstop2h 54mFrontier
Wed 6/198:38 amDEN - MDW
Nonstop2h 22mFrontier
Deal found 5/28$64
Wed 6/128:02 pmSTL - DEN
Nonstop2h 30mFrontier
Tue 6/1811:39 amDEN - STL
Nonstop2h 08mFrontier
Deal found 5/28$66
Tue 6/186:00 amORD - DEN
Nonstop2h 45mFrontier
Tue 6/189:10 pmDEN - ORD
Nonstop2h 30mFrontier
Deal found 5/28$67

Illinois to Denver flights leaving soon

Find last-minute flight options from Illinois to Denver for spontaneous travel. Discover available flights and compare prices based on user searches. Secure great deals and offers for spontaneous trips with quick booking options. Over the last 7 days, Cheapflights users made 2,740,132 searches. Data last updated May 28, 2024.
Check out these flights departing soon from Illinois to Denver. Tip: verify your flight details before completing your reservation.
Thu 6/66:00 amORD - DEN
Nonstop2h 45mFrontier
Wed 6/125:13 pmDEN - ORD
Nonstop2h 35mFrontier
Deal found 5/28$70
Tue 6/42:45 pmMDW - DEN
Nonstop2h 47mFrontier
Tue 6/111:46 pmDEN - MDW
Nonstop2h 24mFrontier
Deal found 5/27$75
Tue 6/410:44 pmSTL - DEN
Nonstop2h 36mFrontier
Thu 7/44:51 pmDEN - STL
Nonstop2h 11mFrontier
Deal found 5/28$78
Wed 6/55:55 amMDW - DEN
Nonstop2h 46mFrontier
Wed 6/128:38 amDEN - MDW
Nonstop2h 22mFrontier
Deal found 5/27$79
Tue 6/48:00 amORD - DEN
Nonstop2h 55mFrontier
Thu 6/69:10 pmDEN - ORD
Nonstop2h 30mFrontier
Deal found 5/28$79
Mon 6/35:01 amMDW - DEN
Nonstop2h 48mFrontier
Tue 6/111:46 pmDEN - MDW
Nonstop2h 24mFrontier
Deal found 5/28$84
Wed 6/55:55 amMDW - DEN
Nonstop2h 46mFrontier
Sat 6/86:04 pmDEN - MDW
Nonstop2h 26mFrontier
Deal found 5/28$85
Tue 6/46:00 amMDW - DEN
Nonstop2h 47mFrontier
Mon 6/108:38 amDEN - MDW
Nonstop2h 22mFrontier
Deal found 5/27$88
Tue 6/48:00 amORD - DEN
Nonstop2h 55mFrontier
Tue 6/119:10 pmDEN - ORD
Nonstop2h 30mFrontier
Deal found 5/28$88

One-way flights to Denver from Illinois

Search for one-way flight options from Illinois to Denver. Find affordable one-way fares based on user searches. Compare prices and availability to plan your one-way journey according to your preferred dates and budget. Over the last 7 days, Cheapflights users made 2,740,132 searches. Data last updated May 28, 2024.
If you're seeking multiple options on one-way flights from Illinois to Denver, be sure to check out these deals, which are updated often. Those seeking round-trip flights from Illinois to Denver should utilize the search form at the the top of the page.
Wed 6/125:55 amMDW - DEN
Nonstop2h 46mFrontier
Deal found 5/27$37
Tue 6/46:00 amMDW - DEN
Nonstop2h 47mFrontier
Deal found 5/27$38
Tue 6/186:00 amMDW - DEN
Nonstop2h 44mFrontier
Deal found 5/27$39
Wed 7/178:02 pmSTL - DEN
Nonstop2h 23mFrontier
Deal found 5/27$39
Wed 6/269:53 pmORD - DEN
Nonstop2h 57mFrontier
Deal found 5/27$39
Tue 6/42:45 pmMDW - DEN
Nonstop2h 47mFrontier
Deal found 5/27$40
Tue 7/163:47 pmSTL - DEN
Nonstop2h 22mFrontier
Deal found 5/27$40
Wed 6/269:53 pmORD - DEN
Nonstop2h 57mFrontier
Deal found 5/27$40
Tue 7/22:06 pmMDW - DEN
Nonstop2h 45mFrontier
Deal found 5/27$41

Find flights from Illinois to Denver within your budget

Customize your flight search to find flights from Illinois to Denver that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,740,132 searches. Data last updated May 28, 2024.

Fly from

Any airport

Fly to

Any airport

Budget

$58 - $179

Route

Depart

Return

Price

Lambert-St LouisDenver Intl

STL - DEN

STLDEN

Lambert-St Louis

Sat 9/21

Nonstop2h 28m

Denver Intl

Wed 9/25

Nonstop2h 11m

$58

Lambert-St LouisDenver Intl

STL - DEN

STLDEN

Lambert-St Louis

Wed 6/12

Nonstop2h 30m

Denver Intl

Wed 6/19

Nonstop2h 09m

$61

Chicago MidwayDenver Intl

MDW - DEN

MDWDEN

Chicago Midway

Sat 6/15

Nonstop2h 54m

Denver Intl

Wed 6/19

Nonstop2h 22m

$64

Lambert-St LouisDenver Intl

STL - DEN

STLDEN

Lambert-St Louis

Tue 6/25

Nonstop2h 29m

Denver Intl

Tue 7/2

Nonstop2h 08m

$66

Chicago O'Hare IntlDenver Intl

ORD - DEN

ORDDEN

Chicago O'Hare Intl

Tue 6/18

Nonstop2h 45m

Denver Intl

Tue 6/18

Nonstop2h 30m

$67

Chicago O'Hare IntlDenver Intl

ORD - DEN

ORDDEN

Chicago O'Hare Intl

Tue 7/2

Nonstop2h 45m

Denver Intl

Fri 7/5

1 stop4h 34m

$112

Greater PeoriaDenver Intl

PIA - DEN

PIADEN

Greater Peoria

Fri 8/16

Nonstop2h 18m

Denver Intl

Fri 8/23

Nonstop2h 03m

$125

Moline Quad-CityDenver Intl

MLI - DEN

MLIDEN

Moline Quad-City

Fri 9/13

1 stop9h 20m

Denver Intl

Sun 9/15

1 stop7h 58m

$145

Chicago O'Hare IntlDenver Intl

ORD - DEN

ORDDEN

Chicago O'Hare Intl

Mon 7/1

1 stop21h 53m

Denver Intl

Fri 7/5

1 stop15h 48m

$179

Flights are sorted by cheapest first

Deals found on 5/27

No data available for this route at this time. Please check back soon.

Best time to book a flight from Illinois to Denver

Have a flexible travel schedule? Discover the best time to fly to Denver from Illinois with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Reviews of airlines servicing Denver

Get insights into the airlines that provide service to Denver. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Denver. Reviews last updated May 28, 2024.
Get a feel of what it's like to fly with Allegiant Air, American Airlines and Frontier from Illinois to Denver by reading reviews from past customers. In addition to providing an overall rating, users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.2
Very good
5,984 reviews
Check prices

Overall

8.2

Boarding

8.3

Food

7.3

Entertainment

7.8

Comfort

8.1

Crew

8.7

Reviews

1 / 10

The seats are too narrow and uncomfortable. I do appreciate that there was room for my knees. I hate the boarding circus.

Southwest
8.2
Very good
5,984 reviews
Southwest
8.2
Very good
5,984 reviews
Check prices

Overall

8.2

Boarding

8.3

Food

7.3

Entertainment

7.8

Comfort

8.1

Crew

8.7

Reviews

1 / 10

The seats are too narrow and uncomfortable. I do appreciate that there was room for my knees. I hate the boarding circus.

Alaska Airlines
8.1
Very good
9,194 reviews
Southwest
8.2
Very good
5,984 reviews
Check prices

Overall

8.2

Boarding

8.3

Food

7.3

Entertainment

7.8

Comfort

8.1

Crew

8.7

Reviews

1 / 10

The seats are too narrow and uncomfortable. I do appreciate that there was room for my knees. I hate the boarding circus.

Delta
8.0
Very good
10,476 reviews
Southwest
8.2
Very good
5,984 reviews
Check prices

Overall

8.2

Boarding

8.3

Food

7.3

Entertainment

7.8

Comfort

8.1

Crew

8.7

Reviews

1 / 10

The seats are too narrow and uncomfortable. I do appreciate that there was room for my knees. I hate the boarding circus.

WestJet
7.5
Good
2,871 reviews
Southwest
8.2
Very good
5,984 reviews
Check prices

Overall

8.2

Boarding

8.3

Food

7.3

Entertainment

7.8

Comfort

8.1

Crew

8.7

Reviews

1 / 10

The seats are too narrow and uncomfortable. I do appreciate that there was room for my knees. I hate the boarding circus.

United Airlines
7.4
Good
10,799 reviews
Southwest
8.2
Very good
5,984 reviews
Check prices

Overall

8.2

Boarding

8.3

Food

7.3

Entertainment

7.8

Comfort

8.1

Crew

8.7

Reviews

1 / 10

The seats are too narrow and uncomfortable. I do appreciate that there was room for my knees. I hate the boarding circus.

Related info for your journey

Find useful and relevant information for your journey from Illinois to Denver. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly into for flights to Denver from Illinois?

    For a flight from Illinois to Denver, you will be flying into Denver Intl. Denver Intl (DEN) is just 18.5 mi from the center of the city.

  • Can I find flights from Illinois to Denver for under $100 on Cheapflights?

    Yes, there are multiple flights from Illinois to Denver for under $100. The cheapest flight booked recently is on Frontier for just $58, but on average you can expect to pay $70.

  • Are there nonstop flights from Illinois to Denver for under $100 on Cheapflights?

    Cheapflights has at least 20 direct flights from Illinois to Denver under $100. A good price for a nonstop flight from Illinois to Denver is less than $66.

  • Are there last-minute flights available from Illinois to Denver for under $100?

    There are currently 20+ open flights from Illinois to Denver within the next 7 days for less than $100.

  • What days are nonstop flights available from Illinois to Denver?

    Nonstop flights are available for this route on the following days: Sunday, Wednesday, Thursday, Friday, Saturday.

  • How many flights depart from Illinois to Denver on average per day?

    On average 35 flights depart from Illinois to Denver per day.
    Early Morning (Midnight to 6am) - 6% of flight departures
    Morning (6am - Noon) - 11% of flight departures
    Afternoon (Noon - 6pm) - 31% of flight departures
    Evening (6pm - Midnight) - 51% of flight departures

  • How long is the flight from Illinois to Denver?

    Airlines like Frontier fly from Illinois to Denver in about 2h 28m. The time it takes to get you to your destination is usually consistent. Airlines will cover a distance of 891 mi. All flights are typically nonstop.

  • What are the most popular routes from Illinois to Denver?

    While some choose either Lambert-St Louis - Denver Intl or Chicago Midway - Denver Intl, Chicago O'Hare Intl - Denver Intl is the most popular route from Illinois to Denver.

  • What are the most reliable airlines from Illinois to Denver?

    The top 3 most reliable airlines when flying from Illinois to Denver are Scandinavian Airlines (89%), Southwest (82%) and Copa Airlines (81%).

  • What are the cheapest flights from Illinois to Denver?

    While on average a flight from Illinois to Denver is generally $536, our data shows the cheapest flight currently is $39. When looking at the most popular route, (Chicago O'Hare Intl - Denver Intl), you can expect to pay $96 for that flight.

  • What does ORD to DEN mean?

    These are just IATA (International Air Transport Association) codes. They are used in aviation to identify and differentiate airports. That’s why a Chicago O'Hare Intl Airport to Denver Intl Airport flight would often be abbreviated as a ORD to DEN flight. While you’re still figuring out your travel plans, it’s not a bad idea to learn the names and codes of other airports around these areas: Chicago Midway Airport (MDW), Moline Quad-City Airport (MLI), Greater Peoria Airport (PIA), Bloomington-Normal Airport (BMI), Springfield Capital Airport (SPI).

  • Can I find deals for flights from Illinois to Denver that include extra baggage allowance?

    The amount of baggage you can bring on your Illinois to Denver flight depends on the airline and the type of fare you've chosen. After entering your flight details, you'll be able to view the specific baggage policies for each deal in the search results. Keep in mind that certain deals may offer additional baggage allowance.

  • Can I find deals on flights from Illinois to Denver with specific airlines?

    Yes, Cheapflights allows you to browse and filter Illinois to Denver flight deals by airline. After entering your origin and destination, use the available filters to view flights offered by airlines.

  • Can I find deals for flights from Illinois to Denver that include hotel bookings?

    Yes. In addition to deals on Illinois to Denver flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Illinois to Denver?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Illinois to Denver.

  • Can I find deals for business class flights from Illinois to Denver?

    Yes. Cheapflights offers flight deals from Illinois to Denver by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • Can I find deals for flights from Illinois to Denver that allow pets onboard?

    Many airlines flying from Illinois to Denver offer the option to travel with pets. After selecting a flight deal, you can find more information about the airline's pet policy on their official website or by contacting the airline directly. Please note that additional fees and restrictions may apply.

  • Can I find deals on last-minute flights from Illinois to Denver?

    Yes, you can often find last-minute deals on Illinois to Denver flights on Cheapflights. However, these deals can vary and may not always be available. We recommend checking back frequently or signing up for price alerts for the most up-to-date deals.

  • How recently were the Illinois to Denver flight deals updated?

    The Illinois to Denver flight deals you see on this page were last updated on 5/28.

  • What are the most popular airlines that fly from Illinois to Denver?

    When booking a flight from Illinois to Denver, you may want to consider flying on American Airlines, Delta or Frontier as they are the most popular for this route.

  • When is the best time to book a flight from Illinois to Denver?

    Currently, December is the cheapest month in which you can book a flight from Illinois to Denver (average of $192). Flying from Illinois to Denver in July is currently the most expensive (average of $272). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

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Alternative routes for Illinois to Denver
See prices for flight routes from nearby airports that may be better suited for you.

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Top 7 airlines flying from Illinois to Denver

Discover the top 7 airlines that operate flights from Illinois to Denver. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,740,132 searches. Data last updated May 28, 2024.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$36Average$122FlexibilityNo cancel feeOn-time62%
Search Frontier flights
Allegiant AirCheapest$95Average$180FlexibilityNo cancel feeOn-time88%
Search Allegiant Air flights
Spirit AirlinesCheapest$96Average$165FlexibilityNo cancel feeOn-time65%
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Search flights from Illinois to Denver by cabin class

Find flights from Illinois to Denver, based on your preferred cabin class, be it economy, premium economy, business, or first class.
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Hourly flight availability from Illinois to Denver

Find hourly flight availability from Illinois to Denver. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated May 28, 2024.
4%of flight departuresEarly morningMidnight to 6 am
37%of flight departuresMorning6 am to noon
38%of flight departuresAfternoonNoon to 6 pm
21%of flight departuresEvening6 pm to midnight
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Fly with Cheapflights

Find the best flight deals on Cheapflights, where travelers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights from Illinois to Denver?

900+ travel sites are searched through when a user searches for a flight using Cheapflights. From the search interface, users can use filters to choose airlines, airports, flight times, cabin classes and more to their preference. Book your flight to Denver from Illinois today with Cheapflights!

Why should you use Cheapflights to find cheap flight tickets from Illinois to Denver?

Cheapflights simply makes it quick and affordable to book flights from Illinois to Denver by bringing together all flight options from hundreds of airlines and agencies online — and put it in one place for you to choose from. Plus, Cheapflights is 100% free to use for all.

Can Cheapflights find flights from Illinois to Denver with no change fees?

Yes, we can. To see specific flights from Illinois to Denver with no change fees, users can toggle flexible booking options after using the search form above to find flights.

Can Cheapflights notify me if prices for flights from Illinois to Denver become cheaper?

Yes, Cheapflights offers price alerts on Illinois to Denver flights so you can book your travel at the perfect time. Price Alerts can be enabled by clicking the bell icon next to the flight deals above and providing your email address where you want to receive the alerts.

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