A city skyline with a prominent arch bridge at sunset.

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

Be in the know
Get alerts if flight prices drop or rise*
Book smarter
Save up to 30% on select hotels after you book a flight*
Earn twice
Earn your airline miles on top of our OneKeyCash
Learn about One Key

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

Prices were available within the past 7 days and start at $189 for one-way flights and $333 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

All deals

One way

Roundtrip

Wed, Dec 2 - Sat, Dec 5

COS

Colorado Springs

STL

St. Louis

$333

Roundtrip

found 2 days ago

Tue, Oct 6 - Wed, Oct 7

COS

Colorado Springs

STL

St. Louis

$333

Roundtrip

found 2 days ago

Wed, Sep 30 - Tue, Oct 13

COS

Colorado Springs

STL

St. Louis

$366

Roundtrip

found 3 days ago

Mon, Nov 9 - Tue, Nov 17

COS

Colorado Springs

STL

St. Louis

$376

Roundtrip

found 4 days ago

Wed, Dec 2 - Sat, Dec 5

COS

Colorado Springs

STL

St. Louis

$378

Roundtrip

found 2 days ago

Wed, Dec 2 - Sat, Dec 5

COS

Colorado Springs

STL

St. Louis

$379

Roundtrip

found 2 days ago

Fri, Oct 23 - Sat, Oct 24

COS

Colorado Springs

STL

St. Louis

$381

Roundtrip

found 2 days ago

Tue, Nov 10 - Wed, Nov 18

COS

Colorado Springs

STL

St. Louis

$382

Roundtrip

found 5 days ago

Thu, Oct 29 - Thu, Nov 19

COS

Colorado Springs

STL

St. Louis

$383

Roundtrip

found 3 days ago

Fri, Nov 13 - Mon, Nov 23

COS

Colorado Springs

STL

St. Louis

$386

Roundtrip

found 3 days ago

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

March is typically the cheapest month to fly

From $206 - $548 per traveler.

What you need to know for your flight from Colorado Springs to Lambert-St. Louis Intl.

Colorado Springs (COS) to St. Louis (STL) at a glance

Travelers can choose from a range of airlines offering flights from Colorado Springs (COS) to St. Louis (STL) on this domestic short-haul route. Whether you prefer full-service or budget-friendly options, you can compare flight prices to find the itinerary that aligns with your budget and schedule. As you plan your visit, don’t miss the chance to explore the iconic sights and vibrant neighborhoods of St. Louis. Here are the essential details for your journey from Colorado Springs Airport to Lambert-St. Louis International Airport.

Fastest (typical) flight duration: around 3h 15m in-flight, plus roughly 1h 15m layover with one stop
Route distance: roughly 800 miles (1,290 km)
Flights per week: around 10 departures on average
Typical fares (one-way): economy tickets often range from $110–$380, depending on seasonality and how far ahead you book

Flights from Colorado Springs Airport (COS) to Lambert-St. Louis International Airport (STL)

Based on recent traveler bookings, the top airlines flying from Colorado Springs to St. Louis are often favored for their one-stop services, typically featuring layovers at Denver International Airport (DEN, approximately 1 hour 15 minutes), Dallas-Fort Worth International Airport (DFW, about 1 hour 15 minutes), and Love Field Airport (DAL, around 1 hour 30 minutes). These choices allow you to customize your travel experience by balancing price, total travel time, and cabin class for the best possible itinerary.

United: As a comprehensive airline providing one-stop options, United offers one-way fares generally ranging from $135 to $395. This carrier manages around 41% of the departures on this route. Passengers can expect an in-flight duration of 3 hours and 15 minutes, with a total travel time of about 4 hours and 45 minutes, including layovers.
Southwest Airlines: Known as a budget-friendly airline, Southwest Airlines provides one-stop services with one-way fares typically between $110 and $380. It accounts for approximately 34% of the departures on this route. Travelers can anticipate an in-flight time of 3 hours and 15 minutes, leading to an overall journey time of around 4 hours and 45 minutes, factoring in layovers.
American Airlines: This full-service airline offers one-stop flights, with one-way ticket prices usually ranging from $110 to $380. American Airlines covers about 22% of the departures for this route. The in-flight duration is approximately 3 hours and 15 minutes, while the entire travel time, including layovers, is roughly 4 hours and 45 minutes.
Delta: As another full-service option, Delta offers one-stop services with one-way fares generally from $115 to $225. This airline accounts for about 4% of the departures on this route. Expect an in-flight time of around 3 hours and 15 minutes, with a total journey time of nearly 4 hours and 45 minutes, including layovers.

Travelers flying from Colorado Springs to St. Louis can opt for an upgrade, as American Airlines provides first-class service on this route.

Best time to fly from Colorado Springs (COS) to St. Louis (STL)

The most popular months for travelers flying from Colorado Springs to St. Louis are March, April, and October, when peak temperatures in St. Louis reach up to 58.6°F in October. If you prefer quieter travel, consider November, the least busy and relatively cheaper time to visit with fewer crowds and temperatures around 46.2°F. For better deals, August usually offers the lowest average one-way fare around $195. Flight availability peaks in July, with approximately 13 flights per week, making it easier to find convenient departure times. February has the fewest flights, with approximately 8 flights per week.

Cheapest time to fly: August usually offers good deals with average one-way fare around $195, roughly 13% cheaper than the yearly average.
More budget-friendly months to fly: November, September, and October typically offer average one-way fares roughly ranging from $201 to $213.
Most flight options: July has the highest number of flights from Colorado Springs to St. Louis, with approximately 13 flights per week, giving you more flexibility in scheduling your trip.

Month	Temperature	Demand	Weekly Flights	Average one-way Fare
January	31.6°F (-0.2°C)	Moderately Low	9	$242
February	34.9°F (1.6°C)	Average	8	$224
March	46.4°F (8.0°C)	Moderately High	9	$279
April	56.1°F (13.4°C)	Moderately High	9	$231
May	66.6°F (19.2°C)	Average	11	$214
June	76.1°F (24.5°C)	Average	11	$217
July	78.6°F (25.9°C)	Average	13	$243
August	77.0°F (25.0°C)	Average	10	$195
September	70.9°F (21.6°C)	Average	10	$202
October	58.6°F (14.8°C)	Moderately High	10	$213
November	46.2°F (7.9°C)	Moderately Low	11	$201
December	37.8°F (3.2°C)	Moderately Low	10	$234

*Average one-way fare is based on Expedia flight booking data from January 2025 to April 2026 for the specified route and travel class and may change depending on availability, dates, and demand.

Alternative route from Colorado Springs (COS) to St. Louis (STL)

Denver to St. Louis (DEN-STL): Located about 73 miles from Colorado Springs Airport (COS), Denver International Airport (DEN) offers a range of one-way economy fares from approximately $45 to $415, which can vary based on the season and when you book your ticket. Travelers can choose between non-stop and one-stop flights on this route. Major airlines operating here include low-cost Southwest Airlines and United. First-class service is also offered for those seeking a more premium experience.

How to find the best prices for flights from Colorado Springs (COS) to St. Louis (STL)

Getting some of the best deals on flights from Colorado Springs to St. Louis is all about timing and flexibility. Here are some key tips to help you save:

Best times to book and fly: cheaper fares are usually available when booking at least two months in advance, although most travelers tend to book between two to eight weeks ahead. Afternoon departures from 12 PM to 6 PM often offer lower prices, while morning flights from 5 AM to 12 PM are the most popular. Additionally, flying on Wednesday generally results in cheaper fares, while Friday remains the busiest travel day.
Set up price alerts: stay updated on price changes by using Expedia's Price Tracker. Receive alerts when fares drop for your selected route.
Bundle and save: bundle your flight and hotel to save on Expedia, or unlock a hotel deal after booking your flight.*
Compare flight options: use Expedia's search tool to compare airlines, routes, direct vs. non-direct flights, and flight times. You can also sort by price to find the most affordable options.
Stay flexible with dates: being open to different travel days can sometimes help you find better prices on flights and hotels.
Think about luggage: nowadays, it's important to check the airline's baggage policies to find the best value. That may be paying for an additional carry-on bag or booking a ticket with checked luggage included. Either way, double-check your allowance before confirming your booking to avoid excess baggage fees at the airport.

*Members only. Savings vary and are not available on all bundles. Select hotels.

Arriving at Lambert-St. Louis International Airport from Colorado Springs Airport

St. Louis welcomes travelers from Colorado Springs with a range of transport options based on price, convenience, and proximity. Here's how to reach St. Louis efficiently:

Hotel transfer: Transfers offer a convenient way to reach your hotel in St. Louis, with private rides that can be arranged in advance.
Car rental: Renting a car from Lambert-St. Louis International Airport is a great option if you plan to explore and sightsee beyond the city. Browse cheap car rentals at Lambert-St. Louis International Airport on Expedia.
Taxi/ride-hailing: Taxis and ride-hailing services may be available from designated pickup areas outside the terminal, check locally on arrival.
Public transportation: From Lambert-St. Louis International Airport, Lambert Main Terminal Station, a metro station, is located just 0.1 miles away on foot, providing quick access to public transportation.

Frequently asked questions

How much does a flight from Colorado Springs, CO (COS) to St. Louis, MO (STL-Lambert-St. Louis Intl.) cost?

You can find cheap one-way flights from $189 and cheap return flights from $333 Colorado Springs, CO (COS) to St. Louis, MO (STL-Lambert-St. Louis Intl.) with Expedia. One-way flights generally range between $134 and $504, and roundtrip flights usually range from $324 to $846. Flight prices vary based on the month and day of the week you want to travel, as well as the airline and how far in advance you book your ticket. Filter your search on Expedia by "Price (lowest to highest)" to see the cheapest fares first, and use the Price Tracking tool to receive alerts when Colorado Springs, CO (COS) to St. Louis, MO (STL-Lambert-St. Louis Intl.) ticket fares go up or down.*Typical price ranges based on flights available on Expedia in the last year. Prices include multi-airline options.

What is the cheapest month to fly from Colorado Springs, CO (COS) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?

September is the cheapest month to fly from Colorado Springs (COS) to St. Louis (STL), with average return fares around $307. This price is about 20% lower than the average, as travel demand tends to drop after summer. Other budget-friendly months include January and August.*Averages based on flights available on Expedia in the last year.

Which airlines fly direct from Colorado Springs, CO (COS) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?

Enter COS to STL and your travel dates, then apply the 'Nonstop' filter to see only direct flights.

How do I find cheap flights from Colorado Springs, CO (COS) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?

To find a cheap flight from Colorado Springs, CO (COS) to St. Louis, MO (STL-Lambert-St. Louis Intl.), be flexible with your dates. Traveling outside of peak vacation months and booking a mid-week flight can help you save. Early morning and late night flights are often more affordable, too. Expedia allows you to compare flight times, airlines and routes all in one place to find low fares. You can also set up Price Tracking and receive alerts when fares go up or down.

What is the best time to fly from Colorado Springs, CO (COS) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?

Flying from Colorado Springs, CO (COS) to St. Louis, MO (STL) is best done in September or January. These months feature average return flight prices of about $307, making them economical choices. September is popular for travel, while January offers a quieter experience, perfect for those looking to avoid the crowds.*Prices based on flights available on Expedia in the last year.

What is the earliest flight from Colorado Springs, CO (COS) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?

The earliest flight from Colorado Springs (COS) to Lambert-St. Louis International (STL) typically departs at around 5:00 AM, operated by American Airlines. This seasonal service is active in July, making it a great option for early travelers. To compare early flights on Expedia, select the "Early Morning" and "Morning" filters in your search.

What are the most popular departure times for flights from Colorado Springs, CO (COS) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?

The most popular departure times for flights from Colorado Springs, CO (COS) to St. Louis, MO (STL) are in the early morning, from 6am to 9am. About 33% of passengers prefer this time window. Many major carriers, including Southwest Airlines and United Airlines, offer flights during this window. This timing works well because it allows you to arrive in St. Louis with plenty of time to enjoy your day.

How long does it take to fly from Colorado Springs, CO (COS) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?

A flight from COS to STL with a layover takes around 5 hours 50 minutes, with the route covering approximately 771 miles. Keep in mind that actual flight times can vary due to wind patterns, weather, and air traffic.

Can you fly business or first class from Colorado Springs, CO (COS) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?

You can fly first class between COS and STL. First class cabins are available on:

Delta Air Lines
United Airlines
American Airlines

How do I earn miles on a Colorado Springs, CO (COS) to St. Louis, MO (STL-Lambert-St. Louis Intl.) flight with Expedia?

It's easy to earn miles on a Colorado Springs, CO (COS) to St. Louis, MO (STL-Lambert-St. Louis Intl.) flight when you book with Expedia. Before you confirm your booking, simply select your frequent flyer program and enter your program number. As a member of One Key™, you can also earn OneKeyCash™* on top of your airline miles when you book with Expedia.*Excludes taxes and fees. OneKeyCash is not redeemable for cash and can only be used on Expedia and other participating brands.

What airports do you fly into for St. Louis from COS (COS)?

From COS (COS), you can fly into Lambert-St. Louis Intl. (STL) to reach St. Louis. Some flights may connect through major hubs like Denver Intl. (DEN), Love Field (DAL), Harry Reid Intl. (LAS) before reaching St. Louis. Compare routes and airports on Expedia to find the best flight options for your travel plans.

Is it cheaper to buy a plane ticket from Colorado Springs, CO (COS) to St. Louis, MO (STL-Lambert-St. Louis Intl.) at the last minute?

Typically, booking a last minute flight from Colorado Springs, CO (COS) to St. Louis, MO (STL-Lambert-St. Louis Intl.) will be more expensive than booking in advance. As the departure date approaches, there are usually fewer seats available which can drive up the cost. However, if there's some wiggle room with your travel dates and times, you could bag a cheap last-minute fare.

Is it cheaper to book a Colorado Springs, CO (COS) to St. Louis, MO (STL-Lambert-St. Louis Intl.) flight and hotel package?

Securing a Colorado Springs, CO (COS) to St. Louis, MO (STL-Lambert-St. Louis Intl.) St Louis Vacation Packages is usually cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your travels all in one place. Select from our extensive range of stays and then add flights, activities and car rentals to your booking. Bundle everything together, and you could save hundreds of dollars.

Can I cancel or change the date of my flight from Colorado Springs, CO (COS) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?

If you booked your Colorado Springs, CO (COS) to St. Louis, MO (STL-Lambert-St. Louis Intl.) flight within the last 24 hours, you may be able to modify or cancel it without any fees. Depending on the airline and the type of ticket you have, additional charges may apply for changes beyond this timeframe. Airline policies and contact information can be found in your itinerary or confirmation email. Or, head to our Customer Service portal if you'd like more information.

Travel information

Origin airport	Colorado Springs
Destination airport	Lambert-St. Louis Intl.
Airlines serving	American Airlines, Delta, Southwest Airlines, United
Roundtrip price	$332
Distance	771 mi

Book with confidence

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 December. 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 2026. You can also book with separate airlines for your outbound and return journeys, from $189 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.

*Flight schedules are subject to change.

*Available to One Key members.

Explore a world of travel with Expedia

Flights

$189 Cheap Flights from Colorado Springs (COS) to St. Louis (STL)

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

Be in the know

Book smarter

Earn twice

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

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

March is typically the cheapest month to flyMarch is typically the cheapest month to fly

What you need to know for your flight from Colorado Springs to Lambert-St. Louis Intl.

Colorado Springs (COS) to St. Louis (STL) at a glance

Flights from Colorado Springs Airport (COS) to Lambert-St. Louis International Airport (STL)

Best time to fly from Colorado Springs (COS) to St. Louis (STL)

Alternative route from Colorado Springs (COS) to St. Louis (STL)

How to find the best prices for flights from Colorado Springs (COS) to St. Louis (STL)

Arriving at Lambert-St. Louis International Airport from Colorado Springs Airport

Frequently asked questions

Travel information

Book with confidence

Colorado Springs to St. Louis Flights

Explore a world of travel with Expedia

March is typically the cheapest month to fly