$129 Cheap Flights from Colorado Springs (COS) to St. Louis (STL)

View $129 flight on Tue, Jan 20, 2026Opens in a new window

Popular airlines from Colorado Springs Airport (COS) to St. Louis Lambert Intl. Airport (STL)

Cheap Flights from Colorado Springs to St. Louis (COS-STL)

Prices were available within the past 7 days and start at $129 for one-way flights and $259 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Southwest Airlines
Thu, Jan 15 - Sun, Jan 18
COS
Colorado Springs
STL
St. Louis
$259 Roundtrip, found 5 days ago
$259
Roundtrip
found 5 days ago
Select Southwest Airlines flight, departing Thu, Jan 15 from Colorado Springs to St. Louis, returning Sun, Jan 18, priced at $259 found 5 days ago
American Airlines
Thu, Jan 15 - Sun, Jan 18
COS
Colorado Springs
STL
St. Louis
$259 Roundtrip, found 5 days ago
$259
Roundtrip
found 5 days ago
Select American Airlines flight, departing Thu, Jan 15 from Colorado Springs to St. Louis, returning Sun, Jan 18, priced at $259 found 5 days ago
Delta
Sat, Feb 14 - Sat, Feb 28
COS
Colorado Springs
STL
St. Louis
$270 Roundtrip, found 5 days ago
$270
Roundtrip
found 5 days ago
Select Delta flight, departing Sat, Feb 14 from Colorado Springs to St. Louis, returning Sat, Feb 28, priced at $270 found 5 days ago
Delta
Mon, Nov 24 - Thu, Nov 27
COS
Colorado Springs
STL
St. Louis
$281 Roundtrip, found 10 hours ago
$281
Roundtrip
found 10 hours ago
Select Delta flight, departing Mon, Nov 24 from Colorado Springs to St. Louis, returning Thu, Nov 27, priced at $281 found 10 hours ago
Southwest Airlines
Sat, Dec 6 - Tue, Dec 9
COS
Colorado Springs
STL
St. Louis
$282 Roundtrip, found 5 days ago
$282
Roundtrip
found 5 days ago
Select Southwest Airlines flight, departing Sat, Dec 6 from Colorado Springs to St. Louis, returning Tue, Dec 9, priced at $282 found 5 days ago
Delta
Tue, Dec 16 - Wed, Dec 31
COS
Colorado Springs
STL
St. Louis
$284 Roundtrip, found 3 hours ago
$284
Roundtrip
found 3 hours ago
Select Delta flight, departing Tue, Dec 16 from Colorado Springs to St. Louis, returning Wed, Dec 31, priced at $284 found 3 hours ago
Southwest Airlines
Thu, Jan 15 - Sun, Jan 18
COS
Colorado Springs
STL
St. Louis
$285 Roundtrip, found 5 days ago
$285
Roundtrip
found 5 days ago
Select Southwest Airlines flight, departing Thu, Jan 15 from Colorado Springs to St. Louis, returning Sun, Jan 18, priced at $285 found 5 days ago
United
Mon, Nov 24 - Mon, Dec 1
COS
Colorado Springs
STL
St. Louis
$287 Roundtrip, just found
$287
Roundtrip
just found
Select United flight, departing Mon, Nov 24 from Colorado Springs to St. Louis, returning Mon, Dec 1, priced at $287 just found
United
Sat, Dec 6 - Tue, Dec 9
COS
Colorado Springs
STL
St. Louis
$288 Roundtrip, found 5 days ago
$288
Roundtrip
found 5 days ago
Select United flight, departing Sat, Dec 6 from Colorado Springs to St. Louis, returning Tue, Dec 9, priced at $288 found 5 days ago
Southwest Airlines
Sat, Dec 6 - Mon, Dec 8
COS
Colorado Springs
STL
St. Louis
$288 Roundtrip, found 3 days ago
$288
Roundtrip
found 3 days ago
Select Southwest Airlines flight, departing Sat, Dec 6 from Colorado Springs to St. Louis, returning Mon, Dec 8, priced at $288 found 3 days ago

Find the cheapest month to fly from Colorado Springs (COS) to St. Louis (STL)

October is typically the cheapest month to fly

From $176 - $561 per traveler.

Alternative airports near St. Louis

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Lambert-St. Louis Intl. STL. Cheapest option available. Average driving time to city center is 20 minutes. Flights from $470
STL
Lambert-St. Louis Intl.
Cheapest
Average driving time to city center20 min
Flights from $470
Flights from Colorado Springs (COS) to St. Louis (STL)
Origin airport
Colorado Springs
Destination airport
Lambert-St. Louis Intl.
Airlines serving
American Airlines, Delta, Southwest Airlines, United
Roundtrip price
$258
Distance
771 mi

Colorado Springs to St. Louis Flights

The cheapest times to fly from Colorado Springs to St. Louis

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Colorado Springs to St. Louis are during the month of January. You can find some of the cheapest flights from Colorado Springs to St. Louis with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Colorado Springs to St. Louis

Sunday is one of the best days to book for cheap flights from Colorado Springs to St. Louis: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from Colorado Springs to St. Louis

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Colorado Springs to St. Louis in 2025. You can also book with separate airlines for your outbound and return journeys, from $129 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Colorado Springs to St. Louis flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your Colorado Springs to St. Louis airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Frequently asked questions

How much does a flight from Colorado Springs Airport (COS) to Lambert-St. Louis Intl. Airport (STL) cost?
Secure a cheap one-way flight from $129 or cheap return flight from $259 from Colorado Springs Airport (COS) to Lambert-St. Louis Intl. Airport (STL) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to see our cheapest flight offers on this route.
What is the cheapest month to fly from Colorado Springs Airport (COS) to Lambert-St. Louis Intl. Airport (STL)?
January is the most affordable month to fly from COS to STL. Traveling outside of peak seasons is often the key to finding better deals on flights.
What is the cheapest airline that flies from Colorado Springs Airport (COS) to Lambert-St. Louis Intl. Airport (STL)?
Expedia's filter tool lets you easily compare different airlines, departure times and fares all in one place. Customize the search to your preferences, then sort by "Price (lowest to highest)" to find the carrier with the cheapest COS to STL flight.
How many flights per day from Colorado Springs Airport (COS) to Lambert-St. Louis Intl. Airport (STL)?
You'll have to hop on a flight with a layover when traveling from Colorado Springs Airport (COS) to Lambert-St. Louis Intl. Airport (STL). Direct flights don't operate daily on this route. However, just filter your search to include one or two stops to discover an option that works for you.
What day of the week has the most flights from COS to STL?
You'll typically find Tuesday the quietest day for flights, while Fridays are often the busiest.* However this can vary from season to season and during peak travel times or public holidays.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Colorado Springs Airport (COS) to Lambert-St. Louis Intl. Airport (STL)?
To avoid possible delays on the Colorado Springs Airport (COS) to Lambert-St. Louis Intl. Airport (STL) route, fly before 3 PM. Later departures are 22% more likely to be canceled.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
Is it cheaper to buy a plane ticket from Colorado Springs Airport (COS) to Lambert-St. Louis Intl. Airport (STL) last-minute?
Booking your plane ticket from COS to STL shortly before your trip is generally more expensive. But if there's some wiggle room with your departure dates and times, you could bag a cheap last-minute fare.
Is it cheaper to book a COS to STL flight and hotel package?
Compared with arranging flights and hotels separately, booking a COS to STL flight and hotel package with Expedia could lead to significant savings. Better still, managing everything in one place takes the hassle out of travel planning. Just pick your flights and choose from our extensive range of stays, then customize your trip with other add-ons like activities and car rentals.
Can I cancel or change the date of my flight from Colorado Springs Airport (COS) to Lambert-St. Louis Intl. Airport (STL)?
Usually, it's possible to cancel or reschedule your COS to STL flight. However, for bookings made more than 24 hours ago, additional fees may apply. Check your airline's policies in your itinerary to see what changes are allowed and if any costs are involved. You'll also find more details on our Customer Service portal.

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*Available to One Key members.