What is the cheapest airline that flies from Lambert-St Louis to Colorado?

Frontier, American Airlines, and Delta are the most popular carriers operating from Lambert-St Louis to Colorado

What airlines fly to Colorado?

Frontier, United Airlines and Southwest are the top three most popular airlines that fly to Colorado from St. Louis according to our data. Frontier is the first choice among our users, with 41% of people opting to fly with this airline when traveling to Colorado. Keep in mind that there are 5 different airlines that fly to Colorado on a routine basis, so you have a few additional options to choose from.

How many flights depart from St. Louis to Colorado on average per day?

11 flights are operational daily from St. Louis to Colorado as of July 2025. The most popular departure time for this route is 5:00AM, with 40% of flights per day taking off in the afternoon.

How many flights depart from St. Louis to Colorado on average per week?

The number of flights available between St. Louis and Colorado is 79 per week as of July 2025. The most frequent departure day is Thu, with 23% of weekly flights leaving on this day.

When did momondo last update prices for flights from Lambert-St Louis Airport to Colorado?

Prices for flights from Lambert-St Louis Airport to Colorado refresh daily.

How many operators does momondo search for flights from Lambert-St Louis Airport to Colorado?

As of July 2025, there are 5 operators available to choose from for flights from Lambert-St Louis Airport to Colorado.

How old do you have to be to fly from Lambert-St Louis Airport to Colorado?

Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Lambert-St Louis Airport to Colorado.

What documentation or ID do you need to fly to Colorado?

The travel and health documents you'll need for your trip to Colorado may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Colorado. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

$30 Cheap Flights from St. Louis to Colorado in 2025

1 adult

0 bags

Discover deals from 900+ travel sites with momondo.

Save money when you book flights with momondo

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize your results.

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Not ready to book? to track prices.

Search flight deals

Find the cheapest flights from St. Louis to Colorado

Round-trip

One-way

Last minute

Direct

Cheap round-trip flights

7:52 pm - 9:20 pmSTL-DEN

2h 28mnonstop

6:00 am - 9:07 amDEN-STL

2h 07mnonstop

$69Frontier

Find Deal

Sat, Oct 25 - Tue, Oct 28

7:55 pm - 9:20 pmSTL-DEN

2h 25mnonstop

6:00 am - 9:06 amDEN-STL

2h 06mnonstop

$78Frontier

Find Deal

Fri, Sep 19 - Sat, Sep 27

5:55 am - 7:15 amSTL-DEN

2h 20mnonstop

5:15 pm - 8:15 pmDEN-STL

2h 00mnonstop

$157Southwest

Find Deal

Wed, Oct 8 - Wed, Oct 8

10:08 am - 4:04 pmSTL-ASE

6h 56m1 stop

4:37 pm - 10:59 pmASE-STL

5h 22m1 stop

$229American Airlines

Find Deal

Fri, Aug 22 - Fri, Aug 29

5:15 am - 9:50 amSTL-EGE

5h 35m1 stop

2:40 pm - 10:59 pmEGE-STL

7h 19m1 stop

$229American Airlines

Find Deal

Fri, Aug 22 - Fri, Aug 29

1:26 pm - 8:39 pmSTL-COS

8h 13m1 stop

5:49 pm - 12:24 amCOS-STL

5h 35m1 stop

$237Delta

Find Deal

Sat, Sep 27 - Tue, Oct 7

1:26 pm - 8:39 pmSTL-COS

8h 13m1 stop

5:55 pm - 8:44 amCOS-STL

13h 49m2 stops

$242Delta

Find Deal

Sat, Sep 27 - Fri, Oct 3

1:35 pm - 7:15 pmSTL-COS

6h 40m2 stops

6:00 am - 5:40 pmCOS-STL

10h 40m2 stops

$247Southwest

Find Deal

Wed, Aug 27 - Wed, Sep 3

4:40 pm - 8:36 pmSTL-DRO

4h 56m1 stop

5:30 am - 12:43 pmDRO-STL

6h 13m1 stop

$253United Airlines

Find Deal

Tue, Aug 19 - Tue, Aug 26

9:00 am - 12:32 pmSTL-DRO

4h 32m1 stop

5:30 am - 2:33 pmDRO-STL

8h 03m2 stops

$259United Airlines

Find Deal

Tue, Aug 19 - Tue, Aug 26

Frontier flights from St. Louis to Colorado

Our best Frontier deals on St. Louis to Colorado flight tickets

Frontier

Oct 25

STL7:52 pmLambert-St Louis

2h 28m

DEN9:20 pmDenver Intl

Oct 28

DEN6:00 amDenver Intl

2h 07m

STL9:07 amLambert-St Louis

$69

Find similar

Frontier

Sep 19

STL7:55 pmLambert-St Louis

2h 25m

DEN9:20 pmDenver Intl

Sep 27

DEN6:00 amDenver Intl

2h 06m

STL9:06 amLambert-St Louis

$78

Find similar

Frontier

Oct 3

STL7:55 pmLambert-St Louis

2h 25m

DEN9:20 pmDenver Intl

Oct 5

DEN6:00 amDenver Intl

2h 06m

STL9:06 amLambert-St Louis

$82

Find similar

Delta flights from St. Louis to Colorado

Our best Delta deals on St. Louis to Colorado flight tickets

Delta

Aug 13

STL5:11 pmLambert-St Louis

6h 44m

1 stop

DEN10:55 pmDenver Intl

Aug 18

DEN12:59 amDenver Intl

6h 13m

1 stop

STL8:12 amLambert-St Louis

$237

Find similar

Delta

Sep 27

STL1:26 pmLambert-St Louis

8h 13m

1 stop

COS8:39 pmColorado Springs

Oct 3

COS5:55 pmColorado Springs

13h 49m

2 stops

STL8:44 amLambert-St Louis

$242

Find similar

Delta

Aug 20

STL7:35 amLambert-St Louis

5h 58m

1 stop

GJT12:33 pmGrand Junction Regnl

Aug 24

GJT6:54 pmGrand Junction Regnl

4h 44m

1 stop

STL12:38 amLambert-St Louis

$249

Find similar

Fly from

Fly to

Route

Depart

Return

Price

St. LouisDenver

STL - DEN

STLDEN

Lambert-St Louis

Sat 10/25

7:52 pm-9:20 pm

Nonstop2h 28m

Denver Intl

Tue 10/28

6:00 am-9:07 am

Nonstop2h 07m

$69

St. LouisDenver

STL - DEN

STLDEN

Lambert-St Louis

Fri 9/19

7:55 pm-9:20 pm

Nonstop2h 25m

Denver Intl

Sat 9/27

6:00 am-9:06 am

Nonstop2h 06m

$78

St. LouisDenver

STL - DEN

STLDEN

Lambert-St Louis

Wed 10/8

5:55 am-7:15 am

Nonstop2h 20m

Denver Intl

Wed 10/8

5:15 pm-8:15 pm

Nonstop2h 00m

$157

St. LouisAspen

STL - ASE

STLASE

Lambert-St Louis

Fri 8/22

10:08 am-4:04 pm

1 stop6h 56m

Aspen Pitkin County

Fri 8/29

4:37 pm-10:59 pm

1 stop5h 22m

$229

St. LouisVail

STL - EGE

STLEGE

Lambert-St Louis

Fri 8/22

5:15 am-9:50 am

1 stop5h 35m

Vail Eagle County

Fri 8/29

2:40 pm-10:59 pm

1 stop7h 19m

$229

St. LouisColorado Springs

STL - COS

STLCOS

Lambert-St Louis

Sat 9/27

1:26 pm-8:39 pm

1 stop8h 13m

Colorado Springs

Tue 10/7

5:49 pm-12:24 am

1 stop5h 35m

$237

St. LouisColorado Springs

STL - COS

STLCOS

Lambert-St Louis

Sat 9/27

1:26 pm-8:39 pm

1 stop8h 13m

Colorado Springs

Fri 10/3

5:55 pm-8:44 am

2 stops13h 49m

$242

St. LouisColorado Springs

STL - COS

STLCOS

Lambert-St Louis

Wed 8/27

1:35 pm-7:15 pm

2 stops6h 40m

Colorado Springs

Wed 9/3

6:00 am-5:40 pm

2 stops10h 40m

$247

St. LouisDurango

STL - DRO

STLDRO

Lambert-St Louis

Tue 8/19

4:40 pm-8:36 pm

1 stop4h 56m

Durango La Plata County

Tue 8/26

5:30 am-12:43 pm

1 stop6h 13m

$253

St. LouisDurango

STL - DRO

STLDRO

Lambert-St Louis

Tue 8/19

9:00 am-12:32 pm

1 stop4h 32m

Durango La Plata County

Tue 8/26

5:30 am-2:33 pm

2 stops8h 03m

$259

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

How to get the cheapest flight ticket from St. Louis to Colorado

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

Prices

Airlines

Other information

What is the cheapest month to fly to Colorado?

The month of September is, on average, the cheapest month to fly to Colorado from St. Louis, with most prices found around $157. The month of August is another great option to travel to Colorado, with average flight prices from St. Louis averaging around $161.

What is the cheapest day to depart on your flight to Colorado?

The cheapest day to depart from St. Louis to Colorado is on a Wednesday when prices can be found for as low as $297. On the other hand, Sunday is the most expensive day to depart from St. Louis because it is more convenient for both business and leisure travelers. As a result, prices tend to be around $419.

What is the cheapest time of day to depart on your flight to Colorado?

The cheapest time of day to fly to Colorado is in the evening when flights can be purchased for as low as $180. In the morning is when there is more demand to fly to Colorado, so prices are often more expensive at around $467 per ticket.

What is the cheapest Lambert-St Louis to Colorado flight route?

Fly from Lambert-St Louis to Denver Intl for the best Lambert-St Louis - Colorado flight prices

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

You are more likely to see cheaper flights to Colorado from St. Louis when booking weeks ahead of your departure date. In general, you can expect to find flights to Colorado for around $216 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Colorado from St. Louis for as low as $148 on momondo.

What cabin class options are available on Lambert-St Louis to Colorado flights?

There are 4 cabin classes available to choose from on Lambert-St Louis to Colorado flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Can stopping save me money on St. Louis to Colorado flights?

No. A direct flight is the cheapest option for a flight between St. Louis to Colorado.

Cheap St. Louis to Colorado flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from St. Louis to Colorado

Best Price Found	$30
Fastest flight time	2h 20m
Direct flights	Every day
Airports in Colorado	2 airports

The best one-way flight to Colorado from St. Louis in the past 72 hours is $30. The best round-trip flight deal from St. Louis to Colorado found on momondo in the last 72 hours is $69.

The fastest flight from St. Louis to Colorado takes 2h 20m

Direct flights go from St. Louis to Colorado every day.

There are 2 airports near Colorado: Colorado Springs (COS), Denver Intl (DEN)

Search flight deals

When did momondo last update prices for flights from Lambert-St Louis Airport to Colorado?
Prices for flights from Lambert-St Louis Airport to Colorado refresh daily.
How many operators does momondo search for flights from Lambert-St Louis Airport to Colorado?
As of July 2025, there are 5 operators available to choose from for flights from Lambert-St Louis Airport to Colorado.
How old do you have to be to fly from Lambert-St Louis Airport to Colorado?
Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Lambert-St Louis Airport to Colorado.
What documentation or ID do you need to fly to Colorado?
The travel and health documents you'll need for your trip to Colorado may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Colorado. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.
What is the most popular plane model from St. Louis to Colorado?
Based on momondo bookings for flights between St. Louis and Colorado, the leading plane model is Boeing 737-800 Passenger/BBJ2 (winglets), making up 17.49% of the total bookings. Other popular models include Boeing 737 MAX 8 with 16.61%, Boeing 737-700 Passenger/BBJ1 (winglets) with 12.93%, and Airbus A320-100/200 with 11.07%.

Best airlines flying from St. Louis to Colorado

Compare and see reviews for airlines that fly from St. Louis to Colorado with momondo

Airline	Rating	Free Cancellation	Price
Frontier	PriceFrom $45	Free Cancellation	Rating 5.9 3,239 reviews	Search Frontier flights
Delta	PriceFrom $128	Free Cancellation	Rating 8.0 7,981 reviews	Search Delta flights
United Airlines	PriceFrom $154	Free Cancellation	Rating 7.4 8,900 reviews	Search United Airlines flights
Southwest	PriceFrom $177	Free Cancellation	Rating 8.0 4,246 reviews	Search Southwest flights
American Airlines	PriceFrom $201	Free Cancellation	Rating 7.2 10,000 reviews	Search American Airlines flights

Why use momondo?

Why should I use momondo to find a flight deal from St. Louis to Colorado?

momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from St. Louis to Colorado. Millions of users trust and use momondo every year so you are in good hands.

Can I find flights from St. Louis to Colorado with flexible booking policies on momondo?

All flight searches from St. Louis to Colorado on momondo can be filtered to show those which offer flexible booking policies.

How can momondo help me find flights from St. Louis to Colorado?

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to Colorado from St. Louis.

I’m not ready to book a flight from St. Louis to Colorado right now. Can momondo alert me if prices change?

Yes. momondo can track prices for St. Louis to Colorado flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.

An easier way to manage your Colorado trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

Start using Trips

Find my bookings

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

1 adult

Tue 8/5

Tue 8/12

Email me momondo's favorite deals

By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to Colorado

Popular cities in Colorado

Flights to New Yorkfrom $39

Flights to Los Angelesfrom $37

Flights to Miamifrom $58

Flights to Chicagofrom $59

Flights to Orlandofrom $54

Flights to Las Vegasfrom $35

Flights to San Franciscofrom $49

Flights to Washington, D.C.from $49

Flights to Bostonfrom $77

Flights to Atlantafrom $29

Flights to Dallasfrom $55

Flights to Seattlefrom $93

Cheap flights from St. Louis to Colorado from $30

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from St. Louis to Colorado departing on 11/5. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

Big names and deals

Big names and deals

Filter for what you want

Filter for what you want

Trusted and free

Trusted and free

Price Alerts

Price Alerts

Find the cheapest flights from St. Louis to Colorado

Cheap round-trip flights

Cheap one-way flights

Cheap last minute flights

Cheap direct flights

Frontier flights from St. Louis to Colorado

Our best Frontier deals on St. Louis to Colorado flight tickets

Delta flights from St. Louis to Colorado

Our best Delta deals on St. Louis to Colorado flight tickets

momondo Fare Finder

Use the filters below to find and compare flights from St. Louis to Colorado that are best for you.

See travel insights to Colorado from

How to get the cheapest flight ticket from St. Louis to Colorado

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest month to fly to Colorado?

The month of September is, on average, the cheapest month to fly to Colorado from St. Louis, with most prices found around $157. The month of August is another great option to travel to Colorado, with average flight prices from St. Louis averaging around $161.

What is the cheapest day to depart on your flight to Colorado?

What is the cheapest time of day to depart on your flight to Colorado?

The cheapest time of day to fly to Colorado is in the evening when flights can be purchased for as low as $180. In the morning is when there is more demand to fly to Colorado, so prices are often more expensive at around $467 per ticket.

What is the cheapest Lambert-St Louis to Colorado flight route?

Fly from Lambert-St Louis to Denver Intl for the best Lambert-St Louis - Colorado flight prices

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

What cabin class options are available on Lambert-St Louis to Colorado flights?

There are 4 cabin classes available to choose from on Lambert-St Louis to Colorado flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Can stopping save me money on St. Louis to Colorado flights?

No. A direct flight is the cheapest option for a flight between St. Louis to Colorado.

What is the cheapest airline that flies from Lambert-St Louis to Colorado?

Frontier, American Airlines, and Delta are the most popular carriers operating from Lambert-St Louis to Colorado

What airlines fly to Colorado?

How many flights depart from St. Louis to Colorado on average per day?

11 flights are operational daily from St. Louis to Colorado as of July 2025. The most popular departure time for this route is 5:00AM, with 40% of flights per day taking off in the afternoon.

How many flights depart from St. Louis to Colorado on average per week?

The number of flights available between St. Louis and Colorado is 79 per week as of July 2025. The most frequent departure day is Thu, with 23% of weekly flights leaving on this day.

Cheap St. Louis to Colorado flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from St. Louis to Colorado

Best Price Found

Fastest flight time

Direct flights

Airports in Colorado

When did momondo last update prices for flights from Lambert-St Louis Airport to Colorado?

How many operators does momondo search for flights from Lambert-St Louis Airport to Colorado?

How old do you have to be to fly from Lambert-St Louis Airport to Colorado?

What documentation or ID do you need to fly to Colorado?

What is the most popular plane model from St. Louis to Colorado?

Best airlines flying from St. Louis to Colorado

Compare and see reviews for airlines that fly from St. Louis to Colorado with momondo

Why use momondo?

Why should I use momondo to find a flight deal from St. Louis to Colorado?

Can I find flights from St. Louis to Colorado with flexible booking policies on momondo?

How can momondo help me find flights from St. Louis to Colorado?

I’m not ready to book a flight from St. Louis to Colorado right now. Can momondo alert me if prices change?

An easier way to manage your Colorado trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

Find better results for your trip to Colorado

Popular cities in Colorado

Popular flights according to clicks in the last 7 days on momondo