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Cheap flights from St. Louis (STL) to Ontario from $113

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 6/11. 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.
STL — YYZ
May 21 — May 281
From?
To?
Tue 5/21
Tue 5/28
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

How far in advance should I book a flight from St. Louis to Region of Ontario?

To save on the cost of your flight from St. Louis to Region of Ontario, book at least 24 days before your planned departure. Booking around this time can save you about 128% on the cost of this flight compared to booking a flight leaving this week. We have found prices from $259 if you need a flight within two weeks. For flights within the next 72 hours, you can find tickets from as low as $473.

What is the cheapest month to fly from St. Louis to Region of Ontario?

March is one of the best times of the year to fly to Region of Ontario from St. Louis. Prices for March average $364 per person but you can even find prices for as low as $176. The most expensive prices can be found in the month of February. Opting for a March flight can save you 80% on your journey compared to booking in February

When is the cheapest time to fly from St. Louis to Region of Ontario (STL - ON)?

When flying from St. Louis to Region of Ontario, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

Cheap Air Canada flights from St. Louis to Ontario

Explore cheap flight options specifically provided by Air Canada for the route between St. Louis and Ontario. 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 2,637,452 searches. Data last updated May 16, 2024.
Check out some of the cheapest Air Canada flights we've come across from St. Louis to Ontario. It's recommended that users confirm their flight details before booking.
Tue 5/289:50 amSTL - YYZ
Nonstop2h 01mAir Canada
Wed 6/192:15 pmYYZ - STL
Nonstop2h 06mAir Canada
Deal found 5/14$443
Wed 7/1710:10 amSTL - YUL
1 stop7h 08mAir Canada
Wed 7/2411:10 amYUL - STL
1 stop5h 11mAir Canada
Deal found 5/15$471
Thu 6/2011:00 amSTL - YYZ
Nonstop1h 59mAir Canada
Thu 6/272:15 pmYYZ - STL
Nonstop2h 06mAir Canada
Deal found 5/14$509
Mon 6/244:05 pmSTL - YYZ
Nonstop1h 59mAir Canada
Thu 6/272:15 pmYYZ - STL
Nonstop2h 06mAir Canada
Deal found 5/15$533
Sat 6/228:05 amSTL - YYZ
1 stop4h 43mAir Canada
Thu 7/46:55 pmYYZ - STL
Nonstop2h 06mAir Canada
Deal found 5/15$537
Sat 7/612:00 pmSTL - YUL
Nonstop2h 23mAir Canada
Fri 7/127:30 pmYUL - STL
Nonstop2h 35mAir Canada
Deal found 5/15$566
Tue 8/612:00 pmSTL - YUL
Nonstop2h 23mAir Canada
Sat 8/1710:10 amYUL - STL
1 stop6h 11mAir Canada
Deal found 5/16$577
Sun 8/114:05 pmSTL - YYZ
Nonstop1h 59mAir Canada
Sat 8/174:00 pmYYZ - STL
1 stop6h 05mAir Canada
Deal found 5/15$579
Sun 6/29:50 amSTL - YYZ
Nonstop2h 01mAir Canada
Thu 6/66:55 pmYYZ - STL
Nonstop2h 06mAir Canada
Deal found 5/15$586

Cheap United Airlines flights from St. Louis to Ontario

Explore cheap flight options specifically provided by United Airlines for the route between St. Louis and Ontario. 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 2,637,452 searches. Data last updated May 16, 2024.
Take a gander at the lowest prices we've found on United Airlines flights from St. Louis to Ontario. Check back soon if you're not seeing flights that suit your needs.
Tue 5/2811:38 amSTL - YYZ
1 stop7h 14mUnited Airlines
Wed 6/192:15 pmYYZ - STL
Nonstop2h 06mUnited Airlines
Deal found 5/14$453
Sat 6/85:31 pmSTL - YYZ
1 stop5h 27mUnited Airlines
Tue 6/112:15 pmYYZ - STL
Nonstop2h 06mUnited Airlines
Deal found 5/14$518
Mon 8/125:30 pmSTL - YYZ
1 stop15h 28mUnited Airlines
Fri 8/307:00 amYYZ - STL
2 stops27h 56mUnited Airlines
Deal found 5/15$567
Mon 8/124:05 pmSTL - YYZ
Nonstop1h 59mUnited Airlines
Fri 8/302:15 pmYYZ - STL
Nonstop2h 06mUnited Airlines
Deal found 5/15$575
Wed 5/226:30 amSTL - YYZ
1 stop6h 17mUnited Airlines
Sun 5/262:15 pmYYZ - STL
Nonstop2h 06mUnited Airlines
Deal found 5/16$1,025
Wed 5/2210:10 amSTL - YYZ
1 stop4h 33mUnited Airlines
Wed 5/296:55 pmYYZ - STL
Nonstop2h 06mUnited Airlines
Deal found 5/16$1,040
Thu 6/69:50 amSTL - YYZ
Nonstop2h 01mUnited Airlines
Wed 6/122:15 pmYYZ - STL
Nonstop2h 06mUnited Airlines
Deal found 5/14$1,479
Thu 6/69:50 amSTL - YYZ
Nonstop2h 01mUnited Airlines
Mon 6/106:55 pmYYZ - STL
Nonstop2h 06mUnited Airlines
Deal found 5/14$1,571

Cheap St. Louis to Ontario flights in May & June 2024

Find cheap flight options from St. Louis to Ontario specifically for the months of May and June 2024. Explore affordable fares based on user searches. Over the last 7 days, Cheapflights users made 2,637,452 searches. Prices were last updated on May 16, 2024.
These are some of the most attractive deals on flights from St. Louis to Ontario in 2024. Check back regularly for other flight deals.
Fri 6/76:10 pmSTL - YYZ
2 stops24h 25mMultiple Airlines
Tue 6/118:20 pmYYZ - STL
1 stop17h 45mMultiple Airlines
Deal found 5/14$271
Thu 6/138:12 pmSTL - YYZ
2 stops16h 48mMultiple Airlines
Thu 6/206:30 amYYZ - STL
1 stop11h 58mMultiple Airlines
Deal found 5/14$283
Thu 6/138:12 pmSTL - YYZ
1 stop17h 16mMultiple Airlines
Thu 6/206:30 amYYZ - STL
1 stop11h 58mMultiple Airlines
Deal found 5/14$289
Tue 6/1111:57 amSTL - YUL
3 stops23h 18mMultiple Airlines
Tue 6/186:50 amYUL - STL
1 stop8h 33mMultiple Airlines
Deal found 5/14$301
Fri 6/76:10 pmSTL - YYZ
2 stops24h 25mMultiple Airlines
Tue 6/112:40 pmYYZ - STL
2 stops23h 25mMultiple Airlines
Deal found 5/14$313
Fri 6/77:29 pmSTL - YYZ
1 stop10h 13mMultiple Airlines
Tue 6/116:30 amYYZ - STL
1 stop8h 53mMultiple Airlines
Deal found 5/14$319
Fri 6/76:10 pmSTL - YYZ
2 stops24h 25mMultiple Airlines
Tue 6/1111:59 amYYZ - STL
3 stops26h 06mMultiple Airlines
Deal found 5/14$325
Sat 6/2211:34 amSTL - YYZ
1 stop11h 28mMultiple Airlines
Tue 7/26:30 amYYZ - STL
1 stop8h 53mMultiple Airlines
Deal found 5/15$327
Thu 6/67:45 amSTL - YYZ
2 stops10h 50mMultiple Airlines
Wed 6/122:00 pmYYZ - STL
1 stop28h 28mMultiple Airlines
Deal found 5/14$328

St. Louis to Ontario 2024 flight deals

Discover exclusive flight deals for travel between St. Louis and Ontario in 2024. Find excellent offers based on user searches. Over the last 7 days, Cheapflights users made 2,637,452 searches. Data last updated May 16, 2024.
These are some of the most attractive deals on flights from St. Louis to Ontario in 2024. Check back regularly for other flight deals.
Fri 6/76:10 pmSTL - YYZ
2 stops24h 25mMultiple Airlines
Tue 6/118:20 pmYYZ - STL
1 stop17h 45mMultiple Airlines
Deal found 5/14$271
Thu 6/138:12 pmSTL - YYZ
2 stops16h 48mMultiple Airlines
Thu 6/206:30 amYYZ - STL
1 stop11h 58mMultiple Airlines
Deal found 5/14$283
Thu 6/138:12 pmSTL - YYZ
1 stop17h 16mMultiple Airlines
Thu 6/206:30 amYYZ - STL
1 stop11h 58mMultiple Airlines
Deal found 5/14$289
Tue 6/1111:57 amSTL - YUL
3 stops23h 18mMultiple Airlines
Tue 6/186:50 amYUL - STL
1 stop8h 33mMultiple Airlines
Deal found 5/14$301
Fri 6/76:10 pmSTL - YYZ
2 stops24h 25mMultiple Airlines
Tue 6/112:40 pmYYZ - STL
2 stops23h 25mMultiple Airlines
Deal found 5/14$313
Fri 6/77:29 pmSTL - YYZ
1 stop10h 13mMultiple Airlines
Tue 6/116:30 amYYZ - STL
1 stop8h 53mMultiple Airlines
Deal found 5/14$319
Fri 6/76:10 pmSTL - YYZ
2 stops24h 25mMultiple Airlines
Tue 6/1111:59 amYYZ - STL
3 stops26h 06mMultiple Airlines
Deal found 5/14$325
Sat 6/2211:34 amSTL - YYZ
1 stop11h 28mMultiple Airlines
Tue 7/26:30 amYYZ - STL
1 stop8h 53mMultiple Airlines
Deal found 5/15$327
Thu 6/67:45 amSTL - YYZ
2 stops10h 50mMultiple Airlines
Wed 6/122:00 pmYYZ - STL
1 stop28h 28mMultiple Airlines
Deal found 5/14$328

Non-stop flights to Ontario from St. Louis

Discover non-stop flight options from St. Louis to Ontario. 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 2,637,452 searches. Data last updated May 16, 2024.
If you're seeking options on non-stop flights from St. Louis to Ontario, check out these fares. If you're looking for other options for flights from St. Louis to Ontario, make sure to update the search form at the top of page.
Tue 5/289:50 amSTL - YYZ
Nonstop2h 01mAir Canada
Wed 6/192:15 pmYYZ - STL
Nonstop2h 06mAir Canada
Deal found 5/14$443
Thu 6/2011:00 amSTL - YYZ
Nonstop1h 59mAir Canada
Thu 6/272:15 pmYYZ - STL
Nonstop2h 06mAir Canada
Deal found 5/14$509
Mon 6/244:05 pmSTL - YYZ
Nonstop1h 59mAir Canada
Thu 6/272:15 pmYYZ - STL
Nonstop2h 06mAir Canada
Deal found 5/15$533
Sat 6/224:05 pmSTL - YYZ
Nonstop1h 59mAir Canada
Tue 7/22:15 pmYYZ - STL
Nonstop2h 06mAir Canada
Deal found 5/15$537
Wed 9/412:00 pmSTL - YUL
Nonstop2h 23mAir Canada
Thu 9/57:30 pmYUL - STL
Nonstop2h 35mAir Canada
Deal found 5/16$541
Tue 8/612:00 pmSTL - YUL
Nonstop2h 23mAir Canada
Sat 8/177:30 pmYUL - STL
Nonstop2h 35mAir Canada
Deal found 5/15$566
Wed 8/710:10 amSTL - YYZ
Nonstop1h 59mAir Canada
Mon 8/126:55 pmYYZ - STL
Nonstop2h 06mAir Canada
Deal found 5/15$574
Mon 8/124:05 pmSTL - YYZ
Nonstop1h 59mUnited Airlines
Fri 8/302:15 pmYYZ - STL
Nonstop2h 06mUnited Airlines
Deal found 5/15$575
Thu 6/139:50 amSTL - YYZ
Nonstop2h 01mAir Canada
Thu 6/206:55 pmYYZ - STL
Nonstop2h 06mAir Canada
Deal found 5/14$584

St. Louis to Ontario flights leaving soon

Find last-minute flight options from St. Louis to Ontario 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 2,637,452 searches. Data last updated May 16, 2024.
Book one of these great deals on flights from St. Louis to Ontario. Users should double check the flight they book to ensure it matches the day, time, and destination they're looking for.
Thu 5/237:45 amSTL - YYZ
2 stops10h 50mMultiple Airlines
Fri 5/248:15 pmYYZ - STL
1 stop15h 13mMultiple Airlines
Deal found 5/16$491
Thu 5/237:45 amSTL - YYZ
2 stops10h 50mMultiple Airlines
Sat 5/258:30 pmYYZ - STL
1 stop11h 38mMultiple Airlines
Deal found 5/16$496
Fri 5/247:45 amSTL - YYZ
2 stops12h 12mMultiple Airlines
Sat 5/258:30 pmYYZ - STL
1 stop11h 38mMultiple Airlines
Deal found 5/16$535
Thu 5/237:45 amSTL - YYZ
2 stops10h 50mMultiple Airlines
Sun 5/266:30 amYYZ - STL
1 stop11h 59mMultiple Airlines
Deal found 5/16$541
Wed 5/228:07 amSTL - YYZ
1 stop9h 23mAmerican Airlines
Wed 5/2911:50 amYYZ - STL
1 stop8h 40mAmerican Airlines
Deal found 5/15$552
Fri 5/247:45 amSTL - YYZ
2 stops12h 12mMultiple Airlines
Sun 5/266:30 amYYZ - STL
1 stop11h 59mMultiple Airlines
Deal found 5/16$580
Sat 5/257:23 pmSTL - YYZ
1 stop10h 12mMultiple Airlines
Sun 5/268:15 pmYYZ - STL
1 stop25h 05mMultiple Airlines
Deal found 5/16$582
Thu 5/237:23 pmSTL - YYZ
1 stop10h 17mMultiple Airlines
Sat 5/258:30 pmYYZ - STL
1 stop11h 38mMultiple Airlines
Deal found 5/16$626
Fri 5/245:37 pmSTL - YYZ
1 stop17h 02mMultiple Airlines
Sat 5/258:30 pmYYZ - STL
1 stop11h 38mMultiple Airlines
Deal found 5/16$628

One-way flights to Ontario from St. Louis

Search for one-way flight options from St. Louis to Ontario. 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 2,637,452 searches. Data last updated May 16, 2024.
Users traveling one-way from St. Louis to Ontario can select one of these great deals. Users in need of a round-trip flight from St. Louis to Ontario instead should update the search form at the top of page.
Tue 6/1111:57 amSTL - YYZ
1 stop10h 29mMultiple Airlines
Deal found 5/15$113
Tue 6/1111:57 amSTL - YYZ
1 stop10h 29mMultiple Airlines
Deal found 5/15$114
Thu 6/137:45 amSTL - YYZ
2 stops10h 50mMultiple Airlines
Deal found 5/15$128
Thu 6/138:12 pmSTL - YYZ
1 stop26h 14mMultiple Airlines
Deal found 5/15$131
Sun 6/237:44 pmSTL - YYZ
1 stop27h 38mMultiple Airlines
Deal found 5/15$136
Tue 6/1111:57 amSTL - YYZ
2 stops17h 45mMultiple Airlines
Deal found 5/15$152
Sun 6/305:45 pmSTL - YUL
1 stop15h 56mSun Country Air
Deal found 5/16$153
Mon 6/246:16 pmSTL - YYZ
1 stop19h 12mMultiple Airlines
Deal found 5/15$158
Sun 6/166:30 amSTL - YYZ
1 stop10h 02mSun Country Air
Deal found 5/15$166

Find flights from St. Louis to Ontario within your budget

Customize your flight search to find flights from St. Louis to Ontario 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 2,637,452 searches. Data last updated May 16, 2024.

Fly from

Any airport

Fly to

Any airport

Budget

$271 - $510

Route

Depart

Return

Price

Lambert-St LouisToronto Pearson Intl

STL - YYZ

STLYYZ

Lambert-St Louis

Fri 6/7

2 stops24h 25m

Toronto Pearson Intl

Tue 6/11

1 stop17h 45m

$271

Lambert-St LouisToronto Pearson Intl

STL - YYZ

STLYYZ

Lambert-St Louis

Thu 6/13

2 stops16h 48m

Toronto Pearson Intl

Thu 6/20

1 stop11h 58m

$283

Lambert-St LouisToronto Pearson Intl

STL - YYZ

STLYYZ

Lambert-St Louis

Thu 6/13

1 stop17h 16m

Toronto Pearson Intl

Thu 6/20

1 stop11h 58m

$289

Lambert-St LouisToronto Pearson Intl

STL - YYZ

STLYYZ

Lambert-St Louis

Tue 5/28

Nonstop2h 01m

Toronto Pearson Intl

Wed 6/19

Nonstop2h 06m

$443

Lambert-St LouisMontreal Pierre Elliott Trudeau Intl

STL - YUL

STLYUL

Lambert-St Louis

Tue 6/11

1 stop8h 55m

Montreal Pierre Elliott Trudeau Intl

Tue 6/18

1 stop8h 30m

$447

Lambert-St LouisMontreal Pierre Elliott Trudeau Intl

STL - YUL

STLYUL

Lambert-St Louis

Wed 9/4

1 stop5h 00m

Montreal Pierre Elliott Trudeau Intl

Thu 9/5

1 stop5h 44m

$449

Lambert-St LouisToronto Pearson Intl

STL - YYZ

STLYYZ

Lambert-St Louis

Tue 5/28

1 stop7h 14m

Toronto Pearson Intl

Wed 6/19

Nonstop2h 06m

$453

Lambert-St LouisToronto Pearson Intl

STL - YYZ

STLYYZ

Lambert-St Louis

Mon 8/12

1 stop8h 29m

Toronto Pearson Intl

Fri 8/30

1 stop8h 38m

$464

Lambert-St LouisMontreal Pierre Elliott Trudeau Intl

STL - YUL

STLYUL

Lambert-St Louis

Wed 9/4

1 stop11h 54m

Montreal Pierre Elliott Trudeau Intl

Thu 9/5

Nonstop2h 35m

$510

Flights are sorted by cheapest first

Deals found on 5/14

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

Reviews of airlines servicing Ontario

Get insights into the airlines that provide service to Ontario. 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 Ontario. Reviews last updated May 16, 2024.
Peruse reviews from past customers who have flown with Air Canada, United Airlines and American Airlines from St. Louis to Ontario to help guide your decision. In addition to providing an overall rating, users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.1
Very good
9,157 reviews
Check prices

Entertainment

7.3

Boarding

8.2

Comfort

7.9

Food

7.3

Crew

8.6

Overall

8.1

Reviews

1 / 10

Paid a lot for our exit row seats and they weren’t that roomy.

Alaska Airlines
8.1
Very good
9,157 reviews
Alaska Airlines
8.1
Very good
9,157 reviews
Check prices

Entertainment

7.3

Boarding

8.2

Comfort

7.9

Food

7.3

Crew

8.6

Overall

8.1

Reviews

1 / 10

Paid a lot for our exit row seats and they weren’t that roomy.

Delta
8.0
Very good
10,673 reviews
Alaska Airlines
8.1
Very good
9,157 reviews
Check prices

Entertainment

7.3

Boarding

8.2

Comfort

7.9

Food

7.3

Crew

8.6

Overall

8.1

Reviews

1 / 10

Paid a lot for our exit row seats and they weren’t that roomy.

KLM
7.9
Good
1,568 reviews
Alaska Airlines
8.1
Very good
9,157 reviews
Check prices

Entertainment

7.3

Boarding

8.2

Comfort

7.9

Food

7.3

Crew

8.6

Overall

8.1

Reviews

1 / 10

Paid a lot for our exit row seats and they weren’t that roomy.

Aeromexico
7.6
Good
2,528 reviews
Alaska Airlines
8.1
Very good
9,157 reviews
Check prices

Entertainment

7.3

Boarding

8.2

Comfort

7.9

Food

7.3

Crew

8.6

Overall

8.1

Reviews

1 / 10

Paid a lot for our exit row seats and they weren’t that roomy.

WestJet
7.5
Good
2,919 reviews
Alaska Airlines
8.1
Very good
9,157 reviews
Check prices

Entertainment

7.3

Boarding

8.2

Comfort

7.9

Food

7.3

Crew

8.6

Overall

8.1

Reviews

1 / 10

Paid a lot for our exit row seats and they weren’t that roomy.

Related info for your journey

Find useful and relevant information for your journey from St. Louis to Ontario. 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 from for flights from St. Louis to Ontario?

    Lambert-St Louis (STL) is the airport you will fly out of if you book a flight from St. Louis to Ontario. It is only a 12.7 mi journey to Lambert-St Louis (STL) from St. Louis’s city center.

  • Can I find flights from St. Louis to Region of Ontario for under $300 on Cheapflights?

    Yes, there are multiple flights from St. Louis to Region of Ontario for under $300. The cheapest flight booked recently is on Multiple Airlines for just $271, but on average you can expect to pay $334.

  • Are there nonstop flights from St. Louis to Region of Ontario for under $500 on Cheapflights?

    Cheapflights has at least 20 direct flights from St. Louis to Region of Ontario under $500. A good price for a nonstop flight from St. Louis to Region of Ontario is less than $662.

  • Are there last-minute flights available from St. Louis to Region of Ontario for under $500?

    There are currently 20+ open flights from St. Louis to Region of Ontario within the next 7 days for less than $500.

  • What are the cheapest airlines to fly from St. Louis to Region of Ontario one-way?

    One-way options have recently been found by users for as low as $153 on Sun Country Air. Other airlines that offer cheap prices include American Airlines from $204 and Delta from $208 one-way.

  • What are the most popular routes from St. Louis to Region of Ontario?

    When deciding which route to take from St. Louis to Region of Ontario consider Lambert-St Louis - Toronto Pearson Intl, Lambert-St Louis - Montreal Pierre Elliott Trudeau Intl or Lambert-St Louis - Ottawa as they are the most popular.

  • What are the most popular airlines that fly from St. Louis to Region of Ontario?

    American Airlines, Air Canada and United Airlines are the most popular airlines when flying from St. Louis to Region of Ontario.

  • What are the most reliable airlines from St. Louis to Region of Ontario?

    No one likes to see their flight delayed. When booking a flight from St. Louis to Region of Ontario consider choosing United Airlines (84%), Air Canada (82%) or Jazz (82%) as they are the most reliable in getting you off to your destination on time.

  • What are the cheapest flights from St. Louis to Region of Ontario?

    Looking for the cheapest flight from St. Louis to Region of Ontario? While on average our users pay $2,157, our data indicates the cheapest price to be $262. The most popular route (Lambert-St Louis - Toronto Pearson Intl), is priced around $255.

  • What does STL to YYZ mean?

    Great question - STL to YYZ just means Lambert-St Louis Airport to Toronto Pearson Intl Airport. Now you’ll know what these unique codes when you look for flights! This flight route has multiple associated airports, so we think it might be helpful to learn the name and codes of them as well. They are Ottawa Airport (YOW), Toronto Island Airport (YTZ), Hamilton Airport (YHM), London Airport (YXU), Toronto Kitchener-Waterloo Airport (YKF).

  • Can I find deals for flights from St. Louis to Ontario that include extra baggage allowance?

    The amount of baggage you can bring on your St. Louis to Ontario 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 St. Louis to Ontario with specific airlines?

    Yes, Cheapflights allows you to browse and filter St. Louis to Ontario 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 St. Louis to Ontario that include hotel bookings?

    Yes. In addition to deals on St. Louis to Ontario flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from St. Louis to Ontario?

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

  • Can I find deals for business class flights from St. Louis to Ontario?

    Yes. Cheapflights offers flight deals from St. Louis to Ontario 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 St. Louis to Ontario that allow pets onboard?

    Many airlines flying from St. Louis to Ontario 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 St. Louis to Ontario?

    Yes, you can often find last-minute deals on St. Louis to Ontario 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 St. Louis to Region of Ontario flight deals updated?

    The St. Louis to Region of Ontario flight deals you see on this page were last updated on 5/15.

See more FAQs

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Alternative routes for St. Louis to Ontario
See prices for flight routes from nearby airports that may be better suited for you.

Kansas City to Vancouver Intl flights
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Joplin to Pierre Elliott Trudeau Intl flights
Columbia to Pierre Elliott Trudeau Intl flights

Top 3 airlines flying from St. Louis to Ontario

Discover the top 3 airlines that operate flights from St. Louis to Ontario. 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 2,637,452 searches. Data last updated May 16, 2024.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapest$188Average$450FlexibilityNo cancel feeOn-time67%
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United AirlinesCheapest$228Average$680FlexibilityNo cancel feeOn-time69%
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American AirlinesCheapest$288Average$551FlexibilityNo cancel feeOn-time71%
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Search flights from St. Louis to Ontario by cabin class

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

Find hourly flight availability from St. Louis to Ontario. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated May 16, 2024.
0%of flight departuresEarly morningMidnight to 6 am
50%of flight departuresMorning6 am to noon
50%of flight departuresAfternoonNoon to 6 pm
0%of flight departuresEvening6 pm to midnight
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6 AM
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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 St. Louis to Ontario?

Cheapflights makes it easy to find St. Louis to Ontario flights by helping our users search from 900+ travel sites for deals. We also provide you with filters for cabin, price, airline, airports, number of stops, and many more to narrow down that perfect flight.

Why should you use Cheapflights to find cheap flight tickets from St. Louis to Ontario?

Millions of users choose and trust Cheapflights to book the best flight deals from St. Louis to Ontario for free. We help you search and compare prices from hundreds of airlines for the right flight just for you.

Can Cheapflights find flights from St. Louis to Ontario with no change fees?

Need flexible booking options for your flight to Ontario from St. Louis? Don’t worry, Cheapflights have you covered. Use our search filter to only show flights with no change fees.

Can Cheapflights notify me if prices for flights from St. Louis to Ontario become cheaper?

Yes, Cheapflights has a feature called Price Alert, which notifies users when flight prices change. Track prices for your flight to Ontario from St. Louis today and book when prices fit your budget.

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