HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news

Cheap flights from Memphis to Colorado Springs (MEM - COS) from $98

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 5/21. 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.
MEM — COS
May 2 — May 91
From?
To?
Thu 5/2
Thu 5/9
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

The best prices from Memphis to Colorado Springs are usually found in October or February, booked 54 days in advance, depart on a Tuesday or Saturday and return on a Saturday

Cheap flight deals from Memphis to Colorado Springs

Discover tips and strategies to find the most affordable flight options for your journey from Memphis (MEM) to Colorado Springs (COS). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated April 27, 2024.

Popular in

March

Cheapest in

October

Round-trip from

$306

One-way from

$98
High demand for flights, 24% potential price rise
Search Deals
Best time to find cheap flights, 33% potential price drop
Search Deals
From Memphis to Colorado Springs
Search Deals
One-way flight from Memphis to Colorado Springs
Search Deals

What is the cheapest day to fly round-trip from Memphis to Colorado Springs?

Thursday flights are found to be more expensive to fly from Memphis to Colorado Springs. This shouldn’t discourage you from searching, as you can still find great deals by being flexible with your options. Use our search form to find deals on tickets to Colorado Springs.

How far in advance should I book a flight from Memphis to Colorado Springs?

To save up to 179% on this flight, we recommend booking at least 35 days prior to travel. The price may fluctuate and will likely increase closer to your departure date. Users on Cheapflights have found tickets from Memphis to Colorado Springs from $315 1-2 weeks out and tickets from $576 for flights departing within the next 72 hours.

What is the cheapest month to fly from Memphis to Colorado Springs?

Flights from Memphis to Colorado Springs lean towards being more expensive in March. Prices are generally better when you fly from Memphis to Colorado Springs in October, with the cheapest ticket starting at $206.

When is the cheapest time to fly from Memphis to Colorado Springs (MEM - COS)?

It’s typically best to fly out from Memphis to Colorado Springs in the afternoon. Doing so could potentially save you 27% on the flight price compared to flying at noon, which is usually more expensive.

Cheap United Airlines flights from Memphis to Colorado Springs

Explore cheap flight options specifically provided by United Airlines for the route between Memphis and Colorado Springs. 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 2,991,349 searches. Data last updated April 27, 2024.
Peruse some of the lowest-priced United Airlines flights we've found from Memphis to Colorado Springs. Make sure to check back often as deals are often changing.
Sat 5/253:31 pmMEM - COS
1 stop6h 06mUnited Airlines
Tue 5/284:30 pmCOS - MEM
1 stop5h 01mUnited Airlines
Deal found 4/26$311
Sat 5/256:55 pmMEM - COS
2 stops14h 44mUnited Airlines
Tue 5/284:30 pmCOS - MEM
1 stop5h 01mUnited Airlines
Deal found 4/26$380
Sun 5/56:36 amMEM - COS
2 stops12h 25mUnited Airlines
Thu 5/912:16 pmCOS - MEM
1 stop4h 47mUnited Airlines
Deal found 4/26$713
Sun 5/55:10 pmMEM - COS
2 stops16h 44mUnited Airlines
Thu 5/91:45 pmCOS - MEM
2 stops7h 03mUnited Airlines
Deal found 4/26$1,607

Cheap Delta flights from Memphis to Colorado Springs

Explore cheap flight options specifically provided by Delta for the route between Memphis and Colorado Springs. 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 2,991,349 searches. Data last updated April 27, 2024.
Have a look at some of the cheapest available Delta flights departing from Memphis and landing in Colorado Springs. If these deals don't fit your criteria, make sure to check back soon as new deals are always added.
Tue 7/94:11 pmMEM - COS
1 stop5h 50mDelta
Tue 7/1611:16 amCOS - MEM
1 stop5h 14mDelta
Deal found 4/26$216
Tue 7/96:10 amMEM - COS
1 stop5h 11mDelta
Tue 7/1611:16 amCOS - MEM
2 stops11h 01mDelta
Deal found 4/26$406
Tue 7/96:10 amMEM - COS
1 stop5h 11mDelta
Tue 7/1611:16 amCOS - MEM
2 stops11h 01mDelta
Deal found 4/27$457
Tue 7/912:00 pmMEM - COS
2 stops10h 01mDelta
Tue 7/1611:16 amCOS - MEM
2 stops11h 01mDelta
Deal found 4/26$627
Tue 7/912:00 pmMEM - COS
2 stops10h 01mDelta
Tue 7/1611:16 amCOS - MEM
2 stops11h 01mDelta
Deal found 4/27$678
Sat 5/258:04 amMEM - COS
2 stops12h 29mDelta
Tue 5/288:20 amCOS - MEM
2 stops11h 20mDelta
Deal found 4/26$1,629

Cheap Memphis to Colorado Springs flights in April & May 2024

Find cheap flight options from Memphis to Colorado Springs specifically for the months of April and May 2024. Explore affordable fares based on user searches. Over the last 7 days, Cheapflights users made 2,991,349 searches. Prices were last updated on April 27, 2024.
These are some of the best deals we've found on flights to Colorado Springs in 2024 at this time. If these deals don't appeal to you, be sure to come back soon for more options.
Sat 5/253:31 pmMEM - COS
1 stop6h 06mUnited Airlines
Tue 5/284:30 pmCOS - MEM
1 stop5h 01mUnited Airlines
Deal found 4/26$311
Sat 5/256:55 pmMEM - COS
2 stops14h 44mUnited Airlines
Tue 5/284:30 pmCOS - MEM
1 stop5h 01mUnited Airlines
Deal found 4/26$380
Sun 5/55:20 amMEM - COS
1 stop5h 42mAmerican Airlines
Thu 5/910:51 amCOS - MEM
1 stop6h 57mAmerican Airlines
Deal found 4/26$510
Sun 5/56:36 amMEM - COS
2 stops12h 25mUnited Airlines
Thu 5/912:16 pmCOS - MEM
1 stop4h 47mUnited Airlines
Deal found 4/26$713
Sun 5/55:10 pmMEM - COS
2 stops16h 44mUnited Airlines
Thu 5/91:45 pmCOS - MEM
2 stops7h 03mUnited Airlines
Deal found 4/26$1,607
Sat 5/258:04 amMEM - COS
2 stops12h 29mDelta
Tue 5/288:20 amCOS - MEM
2 stops11h 20mDelta
Deal found 4/26$1,629

Memphis to Colorado Springs 2024 flight deals

Discover exclusive flight deals for travel between Memphis and Colorado Springs in 2024. Find excellent offers based on user searches. Over the last 7 days, Cheapflights users made 2,991,349 searches. Data last updated April 27, 2024.
These are some of the best deals we've found on flights to Colorado Springs in 2024 at this time. If these deals don't appeal to you, be sure to come back soon for more options.
Wed 8/215:57 amMEM - COS
1 stop4h 30mAmerican Airlines
Sat 8/241:02 pmCOS - MEM
1 stop6h 09mAmerican Airlines
Deal found 4/27$178
Wed 8/217:55 amMEM - COS
1 stop6h 24mAmerican Airlines
Sat 8/241:02 pmCOS - MEM
2 stops9h 09mAmerican Airlines
Deal found 4/27$181
Tue 7/94:11 pmMEM - COS
1 stop5h 50mDelta
Tue 7/1611:16 amCOS - MEM
1 stop5h 14mDelta
Deal found 4/26$216
Wed 8/217:41 amMEM - COS
2 stops8h 56mAmerican Airlines
Sat 8/241:02 pmCOS - MEM
2 stops9h 09mAmerican Airlines
Deal found 4/27$224
Sat 5/253:31 pmMEM - COS
1 stop6h 06mUnited Airlines
Tue 5/284:30 pmCOS - MEM
1 stop5h 01mUnited Airlines
Deal found 4/26$311
Sat 5/256:55 pmMEM - COS
2 stops14h 44mUnited Airlines
Tue 5/284:30 pmCOS - MEM
1 stop5h 01mUnited Airlines
Deal found 4/26$380
Tue 7/96:10 amMEM - COS
1 stop5h 11mDelta
Tue 7/1611:16 amCOS - MEM
2 stops11h 01mDelta
Deal found 4/26$406
Tue 7/96:10 amMEM - COS
1 stop5h 11mDelta
Tue 7/1611:16 amCOS - MEM
2 stops11h 01mDelta
Deal found 4/27$457
Sun 5/55:20 amMEM - COS
1 stop5h 42mAmerican Airlines
Thu 5/910:51 amCOS - MEM
1 stop6h 57mAmerican Airlines
Deal found 4/26$510

Memphis to Colorado Springs flights leaving soon

Find last-minute flight options from Memphis to Colorado Springs 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 2,991,349 searches. Data last updated April 27, 2024.
Consider one of these great deals we found on last-minute flights from Memphis to Colorado Springs. To prevent any unwanted surprises, users should verify their flight info before booking.
Sun 5/55:20 amMEM - COS
1 stop5h 42mAmerican Airlines
Thu 5/910:51 amCOS - MEM
1 stop6h 57mAmerican Airlines
Deal found 4/26$510
Sun 5/56:36 amMEM - COS
2 stops12h 25mUnited Airlines
Thu 5/912:16 pmCOS - MEM
1 stop4h 47mUnited Airlines
Deal found 4/26$713
Sun 5/55:10 pmMEM - COS
2 stops16h 44mUnited Airlines
Thu 5/91:45 pmCOS - MEM
2 stops7h 03mUnited Airlines
Deal found 4/26$1,607

One-way flights to Colorado Springs from Memphis

Search for one-way flight options from Memphis to Colorado Springs. 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 2,991,349 searches. Data last updated April 27, 2024.
Users in need of a one-way flight from Memphis to Colorado Springs can choose from these deals. Users can also find round-trip Memphis to Colorado Springs flights by using the search form above.
Tue 5/215:39 amMEM - COS
1 stop5h 21mAmerican Airlines
Deal found 4/25$98
Wed 5/295:39 amMEM - COS
1 stop5h 21mAmerican Airlines
Deal found 4/25$118
Wed 5/296:30 amMEM - COS
2 stops13h 32mUnited Airlines
Deal found 4/25$223
Tue 5/215:10 pmMEM - COS
2 stops16h 44mUnited Airlines
Deal found 4/25$231

Find flights from Memphis to Colorado Springs within your budget

Customize your flight search to find flights from Memphis to Colorado Springs 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 2,991,349 searches. Data last updated April 27, 2024.

Fly from

Any airport

Fly to

Any airport

Budget

$178 - $627

Route

Depart

Return

Price

MemphisColorado Springs

MEM - COS

MEMCOS

Memphis

Wed 8/21

1 stop4h 30m

Colorado Springs

Sat 8/24

1 stop6h 09m

$178

MemphisColorado Springs

MEM - COS

MEMCOS

Memphis

Wed 8/21

1 stop6h 24m

Colorado Springs

Sat 8/24

2 stops9h 09m

$181

MemphisColorado Springs

MEM - COS

MEMCOS

Memphis

Tue 7/9

1 stop5h 50m

Colorado Springs

Tue 7/16

1 stop5h 14m

$216

MemphisColorado Springs

MEM - COS

MEMCOS

Memphis

Wed 8/21

2 stops8h 56m

Colorado Springs

Sat 8/24

2 stops9h 09m

$224

MemphisColorado Springs

MEM - COS

MEMCOS

Memphis

Sat 5/25

1 stop6h 06m

Colorado Springs

Tue 5/28

1 stop5h 01m

$311

MemphisColorado Springs

MEM - COS

MEMCOS

Memphis

Sat 5/25

2 stops14h 44m

Colorado Springs

Tue 5/28

1 stop5h 01m

$380

MemphisColorado Springs

MEM - COS

MEMCOS

Memphis

Tue 7/9

1 stop5h 11m

Colorado Springs

Tue 7/16

2 stops11h 01m

$406

MemphisColorado Springs

MEM - COS

MEMCOS

Memphis

Tue 7/9

1 stop5h 11m

Colorado Springs

Tue 7/16

2 stops11h 01m

$457

MemphisColorado Springs

MEM - COS

MEMCOS

Memphis

Tue 7/9

2 stops10h 01m

Colorado Springs

Tue 7/16

2 stops11h 01m

$627

Flights are sorted by cheapest first

Deals found on 4/27

When is the best time to book a flight from Memphis to Colorado Springs?

Use this chart to determine the optimal time to book a round-trip flight from Memphis to Colorado Springs. Price data was last updated on January 28, 2024.
Booking 34 days in advance of your planned departure date is, on average, the best time to get cheap flights from Memphis to Colorado Springs. The general trend is that the closer you book to the departure date, the more expensive your flight will be.
Search Deals

When is the cheapest time to fly from Memphis to Colorado Springs?

Use this chart to determine the cheapest time to fly round-trip from Memphis to Colorado Springs. Price data was last updated on April 21, 2024.
Morning
Noon
Afternoon
Evening
All times are departure.
Travelers seeking maximum savings on their Memphis to Colorado Springs flight should consider departing on Thursday evenings when fares are most often at their lowest. Friday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.
Search Deals

Average price of flights to Colorado Springs by month

Plan your trip from Memphis to Colorado Springs by taking into account the cheapest months to travel. The average price of a one-way flight from Memphis to Colorado Springs is currently $168 while a round-trip flight costs $331. Price data was last updated on April 21, 2024.

Currently, January is the cheapest month in which you can book a flight from Memphis to Colorado Springs (average of $306). Flying from Memphis to Colorado Springs in June is currently the most expensive (average of $468). 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.

January

$306

February

$336

March

$409

April

$362

May

$396

June

$468

July

$439

August

$345

September

$355

October

$328

November

$347

December

$315

Temperature and rainfall in Colorado Springs by month

Plan your trip to Colorado Springs by taking into account the average temperature and rainfall totals by month.

COS

Temperature

30.2 - 71.6 °F

Reviews of airlines servicing Colorado Springs

Get insights into the airlines that provide service to Colorado Springs. 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 Colorado Springs. Reviews last updated April 27, 2024.
Get a feel of what it's like to fly with United Airlines, Delta and American Airlines from Memphis to Colorado Springs by reading reviews from past customers. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.1
Very good
10,951 reviews
Check prices

Comfort

7.9

Boarding

8.2

Food

7.4

Entertainment

8.0

Overall

8.1

Crew

8.6

Reviews

1 / 10

Terrible flight crew that skipped our row for service multiple times.

Delta
8.1
Very good
10,951 reviews
Delta
8.1
Very good
10,951 reviews
Check prices

Comfort

7.9

Boarding

8.2

Food

7.4

Entertainment

8.0

Overall

8.1

Crew

8.6

Reviews

1 / 10

Terrible flight crew that skipped our row for service multiple times.

United Airlines
7.4
Good
11,228 reviews
Delta
8.1
Very good
10,951 reviews
Check prices

Comfort

7.9

Boarding

8.2

Food

7.4

Entertainment

8.0

Overall

8.1

Crew

8.6

Reviews

1 / 10

Terrible flight crew that skipped our row for service multiple times.

American Airlines
7.3
Good
14,875 reviews
Delta
8.1
Very good
10,951 reviews
Check prices

Comfort

7.9

Boarding

8.2

Food

7.4

Entertainment

8.0

Overall

8.1

Crew

8.6

Reviews

1 / 10

Terrible flight crew that skipped our row for service multiple times.

Related info for your journey

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

  • Can I find flights from Memphis to Colorado Springs for under $200 on Cheapflights?

    Yes, there are multiple flights from Memphis to Colorado Springs for under $200. The cheapest flight booked recently is on American Airlines for just $178, but on average you can expect to pay $480.

  • Are there last-minute flights available from Memphis to Colorado Springs for under $600?

    There are currently 3+ open flights from Memphis to Colorado Springs within the next 7 days for less than $600.

  • What are the cheapest airlines flying from Memphis to Colorado Springs round-trip?

    Flying on American Airlines is currently your cheapest option to Colorado Springs, with prices starting at $178. Additional round-trip tickets that might be worth considering are offered by Delta and United Airlines, with the lowest prices starting at $216 and $311, respectively. American Airlines is currently priced 51% below the average price you’ll pay for this route.

  • What are the most popular airlines that fly from Memphis to Colorado Springs?

    When booking a flight from Memphis to Colorado Springs, you may want to consider flying on American Airlines, Delta or United Airlines as they are the most popular for this route.

  • What does MEM to COS mean?

    Great question - MEM to COS just means Memphis Airport to Colorado Springs Airport. Now you’ll know what these unique codes when you look for flights!

  • Can I find deals for flights from Memphis to Colorado Springs that include extra baggage allowance?

    The amount of baggage you can bring on your Memphis to Colorado Springs 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 Memphis to Colorado Springs with specific airlines?

    Yes, Cheapflights allows you to browse and filter Memphis to Colorado Springs 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 Memphis to Colorado Springs that include hotel bookings?

    Yes. In addition to deals on Memphis to Colorado Springs flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Memphis to Colorado Springs?

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

  • Can I find deals for business class flights from Memphis to Colorado Springs?

    Yes. Cheapflights offers flight deals from Memphis to Colorado Springs 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 Memphis to Colorado Springs that allow pets onboard?

    Many airlines flying from Memphis to Colorado Springs 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 Memphis to Colorado Springs?

    Yes, you can often find last-minute deals on Memphis to Colorado Springs 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 Memphis to Colorado Springs flight deals updated?

    The Memphis to Colorado Springs flight deals you see on this page were last updated on 4/27.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Memphis to Colorado Springs
See prices for flight routes from nearby airports that may be better suited for you.

Nashville to Denver flights
Memphis to Denver flights
Knoxville to Denver flights
Chattanooga to Denver flights
Nashville to Colorado Springs flights
Blountville to Denver flights
Nashville to Durango flights
Knoxville to Colorado Springs flights
Knoxville to Durango flights
Nashville to Aspen flights
Memphis to Durango flights
Chattanooga to Colorado Springs flights
Nashville to Grand Junction flights
Knoxville to Aspen flights
Memphis to Vail flights
Memphis to Montrose flights
Knoxville to Montrose flights
Nashville to Vail flights
Memphis to Aspen flights
Blountville to Colorado Springs flights
Nashville to Gunnison flights
Memphis to Grand Junction flights
Nashville to Montrose flights
Knoxville to Vail flights
Knoxville to Grand Junction flights
Chattanooga to Aspen flights
Blountville to Grand Junction flights
Blountville to Montrose flights
Memphis to Hayden flights
Nashville to Alamosa flights

Top 3 airlines flying from Memphis to Colorado Springs

Discover the top 3 airlines that operate flights from Memphis to Colorado Springs. 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 2,991,349 searches. Data last updated April 27, 2024.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$206Average$358FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
DeltaCheapest$216Average$265FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
American AirlinesCheapest$225Average$344FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
USA to Bora Bora flights
Chicago to Atlanta flights
USA to London flights
Orlando to Hawaii flights
Seattle to Miami flights
Detroit to Tampa flights
Chicago to Boston flights
New York to Toronto flights
Aruba to Curaçao flights
Miami to Orlando flights
Baltimore to Orlando flights
Memphis to Columbia, Missouri flights

Search flights from Memphis to Colorado Springs by cabin class

Find flights from Memphis to Colorado Springs, based on your preferred cabin class, be it economy, premium economy, business, or first class.
First Class
Business Class
Prem Econ Class
Economy Class

Book a flight to one of these trending destinations

User searches for flights to these destinations increased 20% or more in the past 90 days compared to other destinations
Flights to Perugia Sant Egidio
Flights to Biarritz Parme
Flights to Argostoli Cephalonia
Flights to Melilla
Flights to Milas–Bodrum
Flights to Girona Costa Brava
Flights to Fez Sais
Flights to Zakynthos Dionsios Salomos
Flights to Bourgas
Flights to Bodø
Flights to Reggio Calabria Tito Menniti
Flights to Bastia Poretta
Flights to Skiathos
Flights to Kalamata
Flights to Batumi
Flights to Menorca/Mahon
Flights to Kristiansand Kjevik
Flights to Champaign University-Willard
Flights to Kagoshima
Flights to Ohrid
Flights to Clermont-Ferrand Aulnat
Flights to Parikia Paros
Flights to Lanzhou Arpt
Flights to Mason City

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 Memphis to Colorado Springs?

Deals for Memphis to Colorado Springs flights are sourced from 900+ travel sites when you use Cheapflights. When all flight results come back, Cheapflights lets you sort and filter flights using different criteria to choose better, like price, airport, cabin class, and plenty of other options.

Why should you use Cheapflights to find cheap flight tickets from Memphis to Colorado Springs?

Cheapflights simply makes it quick and affordable to book flights from Memphis to Colorado Springs 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 Memphis to Colorado Springs with no change fees?

Certainly. Search results for flights to Colorado Springs from Memphis shown to you on Cheapflights can be narrowed down with different useful search filters, which includes flexible booking options.

Can Cheapflights notify me if prices for flights from Memphis to Colorado Springs become cheaper?

Of course! You can now track prices for flights from Memphis to Colorado Springs and get an alert from Cheapflights when they change. Have a valid email address ready and click the bell icon next to the flight deals above to set up your price alerts.

100% Free
Cheapflights is completely free to use, so you can start saving the moment you arrive.
Book with Flexibility
Our users can plan ahead with confidence and find flights with no change fees
Travel Smart
Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.
View all available airlines