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 43% of people opting to fly with this airline when traveling to Colorado. Keep in mind that there are 4 different airlines that fly to Colorado on a routine basis, so you have a few additional options to choose from.

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

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

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

The number of flights available between St. Louis and Colorado is 107 per week as of July 2026. The most frequent departure day is Mon, with 18% of weekly flights leaving on this day.

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

15 flights are operational daily from St. Louis to Colorado as of July 2026. The most popular departure time for this route is 5:00AM, with 40% of flights per day taking off in the afternoon.

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 2026, there are 4 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.

$96 Cheap Flights from St. Louis to Colorado in 2026

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from St. Louis to Colorado

Round-trip

One-way

Last minute

Direct

Cheap round-trip flights

Enter your travel dates to find the best prices.

8:08 pm - 9:44 pm

STL

DEN

2h 36mnonstop

5:05 am - 2:56 pm

DEN

STL

8h 51m

1 stop

$155Frontier

Tue, Aug 11 - Thu, Aug 13

8:08 pm - 9:44 pm

STL

DEN

2h 36mnonstop

5:23 pm - 2:56 pm

DEN

STL

20h 33m

1 stop

$156Frontier

Mon, Aug 10 - Wed, Aug 12

3:39 pm - 9:38 pm

STL

COS

6h 59m

1 stop

6:00 am - 2:33 pm

COS

STL

7h 33m

1 stop

$239Delta

Tue, Aug 18 - Thu, Aug 20

9:00 am - 1:20 pm

STL

COS

5h 20m

1 stop

7:00 am - 3:30 pm

COS

STL

7h 30m

2 stops

$249Southwest

Sat, Aug 22 - Sat, Aug 29

9:00 am - 1:20 pm

STL

COS

5h 20m

1 stop

10:25 am - 8:10 pm

COS

STL

8h 45m

2 stops

$251Southwest

Sat, Sep 12 - Mon, Sep 14

9:00 am - 2:27 pm

STL

MTJ

6h 27m

1 stop

1:42 pm - 8:38 pm

MTJ

STL

5h 56m

1 stop

$259United Airlines

Sat, Sep 12 - Sat, Sep 19

9:00 am - 2:27 pm

STL

MTJ

6h 27m

1 stop

1:42 pm - 10:59 pm

MTJ

STL

8h 17m

2 stops

$264United Airlines

Sat, Sep 12 - Sat, Sep 19

5:42 am - 9:18 am

STL

COS

4h 36m

1 stop

3:51 pm - 11:42 pm

COS

STL

6h 51m

1 stop

$271American Airlines

Fri, Aug 28 - Mon, Aug 31

7:00 am - 12:15 pm

STL

COS

6h 15m

1 stop

11:27 am - 11:58 pm

COS

STL

11h 31m

2 stops

$276Delta

Fri, Aug 28 - Mon, Aug 31

5:42 am - 12:10 pm

STL

GUC

7h 28m

1 stop

12:55 pm - 7:51 pm

GUC

STL

5h 56m

1 stop

$329American Airlines

Wed, Sep 2 - Sun, Sep 6

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Frontier flights from St. Louis to Colorado

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

Frontier

Aug 11

STL8:08 pmLambert-St Louis

2h 36m

DEN9:44 pmDenver Intl

Aug 13

DEN5:05 amDenver Intl

8h 51m

1 stop

STL2:56 pmLambert-St Louis

$155

Frontier

Aug 7

STL4:57 pmLambert-St Louis

17h 06m

1 stop

DEN9:03 amDenver Intl

Aug 10

DEN4:10 pmDenver Intl

2h 13m

STL7:23 pmLambert-St Louis

$156

Frontier

Aug 8

STL3:41 pmLambert-St Louis

5h 51m

1 stop

DEN8:32 pmDenver Intl

Aug 17

DEN4:10 pmDenver Intl

2h 13m

STL7:23 pmLambert-St Louis

$157

Southwest flights from St. Louis to Colorado

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

Southwest

Sep 19

STL8:25 amLambert-St Louis

8h 05m

2 stops

COS3:30 pmColorado Springs

Sep 22

COS7:20 amColorado Springs

4h 55m

1 stop

STL1:15 pmLambert-St Louis

$249

Southwest

Sep 12

STL9:00 amLambert-St Louis

5h 20m

1 stop

COS1:20 pmColorado Springs

Sep 14

COS10:25 amColorado Springs

8h 45m

2 stops

STL8:10 pmLambert-St Louis

$251

Southwest

Sep 19

STL8:25 amLambert-St Louis

8h 05m

2 stops

COS3:30 pmColorado Springs

Sep 22

COS7:20 amColorado Springs

8h 25m

2 stops

STL4:45 pmLambert-St Louis

$255

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

Quickest round-trip

St. LouisDenver

STL - DEN

STLDEN

Lambert-St Louis

Tue 8/11

8:08 pm-9:44 pm

Nonstop2h 36m

Denver Intl

Thu 8/13

5:05 am-2:56 pm

1 stop8h 51m

$155

St. LouisDenver

STL - DEN

STLDEN

Lambert-St Louis

Mon 8/10

8:08 pm-9:44 pm

Nonstop2h 36m

Denver Intl

Wed 8/12

5:23 pm-2:56 pm

1 stop20h 33m

$156

St. LouisColorado Springs

STL - COS

STLCOS

Lambert-St Louis

Tue 8/18

3:39 pm-9:38 pm

1 stop6h 59m

Colorado Springs

Thu 8/20

6:00 am-2:33 pm

1 stop7h 33m

$239

St. LouisColorado Springs

STL - COS

STLCOS

Lambert-St Louis

Sat 8/22

9:00 am-1:20 pm

1 stop5h 20m

Colorado Springs

Sat 8/29

7:00 am-3:30 pm

2 stops7h 30m

$249

St. LouisColorado Springs

STL - COS

STLCOS

Lambert-St Louis

Sat 9/12

9:00 am-1:20 pm

1 stop5h 20m

Colorado Springs

Mon 9/14

10:25 am-8:10 pm

2 stops8h 45m

$251

St. LouisMontrose

STL - MTJ

STLMTJ

Lambert-St Louis

Sat 9/12

9:00 am-2:27 pm

1 stop6h 27m

Montrose County

Sat 9/19

1:42 pm-8:38 pm

1 stop5h 56m

$259

St. LouisMontrose

STL - MTJ

STLMTJ

Lambert-St Louis

Sat 9/12

9:00 am-2:27 pm

1 stop6h 27m

Montrose County

Sat 9/19

1:42 pm-10:59 pm

2 stops8h 17m

$264

St. LouisColorado Springs

STL - COS

STLCOS

Lambert-St Louis

Fri 8/28

5:42 am-9:18 am

1 stop4h 36m

Colorado Springs

Mon 8/31

3:51 pm-11:42 pm

1 stop6h 51m

$271

St. LouisColorado Springs

STL - COS

STLCOS

Lambert-St Louis

Fri 8/28

7:00 am-12:15 pm

1 stop6h 15m

Colorado Springs

Mon 8/31

11:27 am-11:58 pm

2 stops11h 31m

$276

St. LouisGunnison

STL - GUC

STLGUC

Lambert-St Louis

Wed 9/2

5:42 am-12:10 pm

1 stop7h 28m

Gunnison

Sun 9/6

12:55 pm-7:51 pm

1 stop5h 56m

$329

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 April is, on average, the cheapest month to fly to Colorado from St. Louis, with most prices found around $34. The month of November is another great option to travel to Colorado, with average flight prices from St. Louis averaging around $42.

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 Saturday when prices can be found for as low as $311. 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 $427.

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 $211. In the morning is when there is more demand to fly to Colorado, so prices are often more expensive at around $437 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 from St. Louis 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 $246 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 $182 on momondo.

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

There are 4 cabin classes available to choose from on 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	$180
Fastest flight time	2h 15m
Direct flights	Every day
Airports in Colorado	87 airports

The best one-way flight to Colorado from St. Louis in the past 72 hours is $180. The best round-trip flight deal from St. Louis to Colorado found on momondo in the last 72 hours is $302.

The fastest flight from St. Louis to Colorado takes 2h 15m

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

There are 87 airports in Colorado. From St. Louis there are direct flights to Denver Intl (DEN).

Search flight deals

Frequently asked questions about flying from St. Louis to Colorado

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 2026, there are 4 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 MAX 8, making up 20.85% of the total bookings. Other popular models include Boeing 737-800 Passenger/BBJ2 (winglets) with 16.05%, Boeing 737-800 with 16.03%, and Airbus A320neo with 13.33%.

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 $56	Free Cancellation	Rating 5.6 2,834 reviews	Search Frontier flights
American Airlines	PriceFrom $158	Free Cancellation	Rating 7.1 11,790 reviews	Search American Airlines flights
United Airlines	PriceFrom $168	Free Cancellation	Rating 7.4 9,953 reviews	Search United Airlines flights
Southwest	PriceFrom $169	Free Cancellation	Rating 7.9 4,250 reviews	Search Southwest 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.

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Popular cities in Colorado

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Cheap flights from St. Louis to Colorado from $96

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 7/22. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

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Frontier flights from St. Louis to Colorado

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

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

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See travel insights to Colorado from

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

What is the cheapest month to fly to Colorado?

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?

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

How far in advance should I book a flight from St. Louis to Colorado?

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

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

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

What airlines fly to Colorado?

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

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

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

Frequently asked questions about flying 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?

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

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

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