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Cheap flights from St. Louis to Colorado from $34

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 4/20. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
1 adult, Economy, 0 bags

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Find the cheapest flights from St. Louis to Colorado

Cheap round-trip flights

Enter your travel dates to find the best prices.
Frontier Logo
8:08 pm - 9:41 pm
STL
-
DEN
2h 33mnonstop
Frontier Logo
4:15 pm - 7:23 pm
DEN
-
STL
2h 08mnonstop
$85Frontier
Sat, May 9 - Mon, May 18
Frontier Logo
8:08 pm - 9:41 pm
STL
-
DEN
2h 33mnonstop
Frontier Logo
4:15 pm - 7:23 pm
DEN
-
STL
2h 08mnonstop
$86Frontier
Sat, May 9 - Mon, May 11
Southwest Logo
6:20 am - 9:20 am
STL
-
COS
4h 00m
1 stop
Southwest Logo
4:45 pm - 11:15 pm
COS
-
STL
5h 30m
1 stop
$231Southwest
Thu, May 7 - Tue, May 12
Southwest Logo
6:05 am - 11:35 am
STL
-
COS
6h 30m
1 stop
Southwest Logo
7:05 am - 1:00 pm
COS
-
STL
4h 55m
2 stops
$236Southwest
Thu, May 7 - Tue, May 12
American Airlines Logo
6:11 pm - 10:25 pm
STL
-
COS
5h 14m
1 stop
American Airlines Logo
1:39 pm - 7:30 pm
COS
-
STL
4h 51m
1 stop
$241American Airlines
Tue, Apr 21 - Sat, Apr 25
Delta Logo
11:42 am - 10:13 pm
STL
-
COS
11h 31m
2 stops
Delta Logo
11:55 am - 11:36 pm
COS
-
STL
10h 41m
2 stops
$251Delta
Tue, Apr 28 - Tue, May 5
United Airlines Logo
8:54 am - 12:40 pm
STL
-
HDN
4h 46m
1 stop
United Airlines Logo
1:40 pm - 8:54 pm
HDN
-
STL
6h 14m
1 stop
$271United Airlines
Tue, Apr 21 - Sat, Apr 25
Delta Logo
2:20 pm - 10:13 pm
STL
-
COS
8h 53m
1 stop
Delta Logo
7:59 am - 4:50 pm
COS
-
STL
7h 51m
2 stops
$277Delta
Tue, Apr 21 - Sat, Apr 25
American Airlines Logo
6:11 pm - 11:32 pm
STL
-
COS
6h 21m
1 stop
American Airlines Logo
5:13 pm - 10:59 pm
COS
-
STL
4h 46m
1 stop
$280American Airlines
Sat, May 9 - Mon, May 11
United Airlines Logo
5:59 pm - 11:59 pm
STL
-
COS
7h 00m
1 stop
United Airlines Logo
3:25 pm - 8:43 pm
COS
-
STL
4h 18m
1 stop
$287United Airlines
Fri, May 8 - Sat, May 9

Frontier flights from St. Louis to Colorado

Our best Frontier deals on St. Louis to Colorado flight tickets
Frontier
May 9
STL8:08 pmLambert-St Louis
2h 33m
DEN9:41 pmDenver Intl
May 11
DEN4:15 pmDenver Intl
2h 08m
STL7:23 pmLambert-St Louis
$85
Frontier
May 9
STL8:08 pmLambert-St Louis
2h 33m
DEN9:41 pmDenver Intl
May 11
DEN4:15 pmDenver Intl
2h 08m
STL7:23 pmLambert-St Louis
$86
Frontier
May 2
STL8:17 pmLambert-St Louis
2h 33m
DEN9:50 pmDenver Intl
May 4
DEN4:20 pmDenver Intl
2h 12m
STL7:32 pmLambert-St Louis
$87

American Airlines flights from St. Louis to Colorado

Our best American Airlines deals on St. Louis to Colorado flight tickets
American Airlines
Apr 21
STL6:11 pmLambert-St Louis
5h 14m
1 stop
COS10:25 pmColorado Springs
Apr 25
COS1:39 pmColorado Springs
4h 51m
1 stop
STL7:30 pmLambert-St Louis
$241
American Airlines
May 9
STL6:11 pmLambert-St Louis
6h 21m
1 stop
COS11:32 pmColorado Springs
May 11
COS5:13 pmColorado Springs
4h 46m
1 stop
STL10:59 pmLambert-St Louis
$280
American Airlines
Apr 30
STL7:12 amLambert-St Louis
5h 46m
1 stop
MTJ11:58 amMontrose County
May 7
MTJ12:42 pmMontrose County
5h 48m
1 stop
STL7:30 pmLambert-St Louis
$285

momondo Fare Finder

 
Customize your flight search to find flights from St. Louis to Colorado 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, momondo users made 832,500 searches. Data last updated April 3, 2026.
Use the filters below to find and compare flights from St. Louis to Colorado that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip
Quickest round-trip

St. LouisDenver

STL - DEN

STLDEN

Lambert-St Louis

Sat 5/9

8:08 pm-9:41 pm

Nonstop2h 33m

Denver Intl

Mon 5/18

4:15 pm-7:23 pm

Nonstop2h 08m

$85

St. LouisDenver

STL - DEN

STLDEN

Lambert-St Louis

Sat 5/9

8:08 pm-9:41 pm

Nonstop2h 33m

Denver Intl

Mon 5/11

4:15 pm-7:23 pm

Nonstop2h 08m

$86

St. LouisColorado Springs

STL - COS

STLCOS

Lambert-St Louis

Thu 5/7

6:20 am-9:20 am

1 stop4h 00m

Colorado Springs

Tue 5/12

4:45 pm-11:15 pm

1 stop5h 30m

$231

St. LouisColorado Springs

STL - COS

STLCOS

Lambert-St Louis

Thu 5/7

6:05 am-11:35 am

1 stop6h 30m

Colorado Springs

Tue 5/12

7:05 am-1:00 pm

2 stops4h 55m

$236

St. LouisColorado Springs

STL - COS

STLCOS

Lambert-St Louis

Tue 4/21

6:11 pm-10:25 pm

1 stop5h 14m

Colorado Springs

Sat 4/25

1:39 pm-7:30 pm

1 stop4h 51m

$241

St. LouisColorado Springs

STL - COS

STLCOS

Lambert-St Louis

Tue 4/28

11:42 am-10:13 pm

2 stops11h 31m

Colorado Springs

Tue 5/5

11:55 am-11:36 pm

2 stops10h 41m

$251

St. LouisHayden

STL - HDN

STLHDN

Lambert-St Louis

Tue 4/21

8:54 am-12:40 pm

1 stop4h 46m

Hayden Yampa Valley

Sat 4/25

1:40 pm-8:54 pm

1 stop6h 14m

$271

St. LouisColorado Springs

STL - COS

STLCOS

Lambert-St Louis

Tue 4/21

2:20 pm-10:13 pm

1 stop8h 53m

Colorado Springs

Sat 4/25

7:59 am-4:50 pm

2 stops7h 51m

$277

St. LouisColorado Springs

STL - COS

STLCOS

Lambert-St Louis

Sat 5/9

6:11 pm-11:32 pm

1 stop6h 21m

Colorado Springs

Mon 5/11

5:13 pm-10:59 pm

1 stop4h 46m

$280

St. LouisColorado Springs

STL - COS

STLCOS

Lambert-St Louis

Fri 5/8

5:59 pm-11:59 pm

1 stop7h 00m

Colorado Springs

Sat 5/9

3:25 pm-8:43 pm

1 stop4h 18m

$287

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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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 October is, on average, the cheapest month to fly to Colorado from St. Louis, with most prices found around $177. The month of September is another great option to travel to Colorado, with average flight prices from St. Louis averaging around $191.

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 $296. 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 $412.

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 $189. At noon is when there is more demand to fly to Colorado, so prices are often more expensive at around $446 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 $234 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 $177 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

$161

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 $161. The best round-trip flight deal from St. Louis to Colorado found on momondo in the last 72 hours is $273.
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?

  • 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?

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
FrontierPriceFrom $56Free CancellationRating
5.7
3,000 reviews
Search Frontier flights
DeltaPriceFrom $108Free CancellationRating
7.9
8,374 reviews
Search Delta flights
United AirlinesPriceFrom $159Free CancellationRating
7.4
9,538 reviews
Search United Airlines flights
SouthwestPriceFrom $174Free CancellationRating
8.0
4,344 reviews
Search Southwest flights
American AirlinesPriceFrom $201Free CancellationRating
7.1
11,551 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.

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