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Cheap flights from Colorado to St. Louis from $23

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Colorado to St. Louis departing on 1/14. 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
0 bags

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Find the cheapest flights from Colorado to St. Louis

Cheap round-trip flights

Enter your travel dates to find the best prices.
Frontier Logo
6:00 am - 7:41 pm
DEN
-
STL
12h 41m1 stop
Frontier Logo
7:43 pm - 9:15 pm
STL
-
DEN
2h 32mnonstop
$104Frontier
Fri, Feb 20 - Mon, Feb 23
Frontier Logo
6:50 am - 10:02 am
DEN
-
STL
2h 12mnonstop
Frontier Logo
8:32 pm - 12:21 pm
STL
-
DEN
16h 49m1 stop
$106Frontier
Sat, Jan 10 - Wed, Jan 14
United Airlines Logo
7:00 am - 1:16 pm
DRO
-
STL
5h 16m1 stop
United Airlines Logo
8:45 am - 12:36 pm
STL
-
DRO
4h 51m1 stop
$200United Airlines
Wed, Jan 21 - Sat, Jan 24
United Airlines Logo
1:38 pm - 8:58 pm
DRO
-
STL
6h 20m1 stop
United Airlines Logo
11:20 am - 8:31 pm
STL
-
DRO
10h 11m2 stops
$206United Airlines
Wed, Jan 21 - Sat, Jan 24
Delta Logo
3:10 pm - 11:39 pm
EGE
-
STL
7h 29m1 stop
Delta Logo
7:10 am - 2:05 pm
STL
-
EGE
7h 55m1 stop
$229Delta
Thu, Jan 15 - Sun, Jan 18
Southwest Logo
1:45 pm - 7:05 pm
COS
-
STL
4h 20m1 stop
Southwest Logo
2:25 pm - 10:00 pm
STL
-
COS
8h 35m1 stop
$273Southwest
Fri, Jan 9 - Thu, Jan 15
Southwest Logo
7:20 am - 4:50 pm
COS
-
STL
8h 30m2 stops
Southwest Logo
2:25 pm - 10:00 pm
STL
-
COS
8h 35m1 stop
$279Southwest
Fri, Jan 9 - Thu, Jan 15
American Airlines Logo
10:57 am - 6:14 pm
EGE
-
STL
6h 17m1 stop
American Airlines Logo
7:15 am - 12:27 pm
STL
-
EGE
6h 12m1 stop
$284American Airlines
Fri, Jan 9 - Sun, Jan 11
Delta Logo
12:00 pm - 11:25 pm
COS
-
STL
10h 25m2 stops
Delta Logo
6:00 am - 12:23 pm
STL
-
COS
7h 23m1 stop
$298Delta
Fri, Jan 16 - Mon, Jan 19
American Airlines Logo
11:12 am - 7:29 pm
EGE
-
STL
7h 17m1 stop
American Airlines Logo
6:44 pm - 12:27 pm
STL
-
EGE
18h 43m2 stops
$387American Airlines
Thu, Jan 15 - Sun, Jan 18

United Airlines flights from Colorado to St. Louis

Our best United Airlines deals on Colorado to St. Louis flight tickets
United Airlines
Jan 14
DEN10:10 amDenver Intl
2h 06m
STL1:16 pmLambert-St Louis
Jan 21
STL6:00 pmLambert-St Louis
2h 38m
DEN7:38 pmDenver Intl
$157
Find similar
United Airlines
Jan 21
DRO7:00 amDurango La Plata County
5h 16m
1 stop
STL1:16 pmLambert-St Louis
Jan 24
STL8:45 amLambert-St Louis
4h 51m
1 stop
DRO12:36 pmDurango La Plata County
$200
Find similar
United Airlines
Jan 21
DRO1:38 pmDurango La Plata County
6h 20m
1 stop
STL8:58 pmLambert-St Louis
Jan 24
STL11:20 amLambert-St Louis
10h 11m
2 stops
DRO8:31 pmDurango La Plata County
$206
Find similar

Frontier flights from Colorado to St. Louis

Our best Frontier deals on Colorado to St. Louis flight tickets
Frontier
Feb 20
DEN6:00 amDenver Intl
12h 41m
1 stop
STL7:41 pmLambert-St Louis
Feb 23
STL7:43 pmLambert-St Louis
2h 32m
DEN9:15 pmDenver Intl
$104
Find similar
Frontier
Jan 10
DEN6:50 amDenver Intl
2h 12m
STL10:02 amLambert-St Louis
Jan 14
STL8:32 pmLambert-St Louis
16h 49m
1 stop
DEN12:21 pmDenver Intl
$106
Find similar
Frontier
Jan 23
DEN3:38 pmDenver Intl
2h 06m
STL6:44 pmLambert-St Louis
Jan 26
STL9:45 pmLambert-St Louis
13h 47m
1 stop
DEN10:32 amDenver Intl
$108
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from Colorado to St. Louis 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 December 11, 2025.
Use the filters below to find and compare flights from Colorado to St. Louis that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

DenverSt. Louis

DEN - STL

DENSTL

Denver Intl

Fri 2/20

6:00 am-7:41 pm

1 stop12h 41m

Lambert-St Louis

Mon 2/23

7:43 pm-9:15 pm

Nonstop2h 32m

$104

DenverSt. Louis

DEN - STL

DENSTL

Denver Intl

Sat 1/10

6:50 am-10:02 am

Nonstop2h 12m

Lambert-St Louis

Wed 1/14

8:32 pm-12:21 pm

1 stop16h 49m

$106

DurangoSt. Louis

DRO - STL

DROSTL

Durango La Plata County

Wed 1/21

7:00 am-1:16 pm

1 stop5h 16m

Lambert-St Louis

Sat 1/24

8:45 am-12:36 pm

1 stop4h 51m

$200

DurangoSt. Louis

DRO - STL

DROSTL

Durango La Plata County

Wed 1/21

1:38 pm-8:58 pm

1 stop6h 20m

Lambert-St Louis

Sat 1/24

11:20 am-8:31 pm

2 stops10h 11m

$206

VailSt. Louis

EGE - STL

EGESTL

Vail Eagle County

Thu 1/15

3:10 pm-11:39 pm

1 stop7h 29m

Lambert-St Louis

Sun 1/18

7:10 am-2:05 pm

1 stop7h 55m

$229

Colorado SpringsSt. Louis

COS - STL

COSSTL

Colorado Springs

Fri 1/9

1:45 pm-7:05 pm

1 stop4h 20m

Lambert-St Louis

Thu 1/15

2:25 pm-10:00 pm

1 stop8h 35m

$273

Colorado SpringsSt. Louis

COS - STL

COSSTL

Colorado Springs

Fri 1/9

7:20 am-4:50 pm

2 stops8h 30m

Lambert-St Louis

Thu 1/15

2:25 pm-10:00 pm

1 stop8h 35m

$279

VailSt. Louis

EGE - STL

EGESTL

Vail Eagle County

Fri 1/9

10:57 am-6:14 pm

1 stop6h 17m

Lambert-St Louis

Sun 1/11

7:15 am-12:27 pm

1 stop6h 12m

$284

Colorado SpringsSt. Louis

COS - STL

COSSTL

Colorado Springs

Fri 1/16

12:00 pm-11:25 pm

2 stops10h 25m

Lambert-St Louis

Mon 1/19

6:00 am-12:23 pm

1 stop7h 23m

$298

VailSt. Louis

EGE - STL

EGESTL

Vail Eagle County

Thu 1/15

11:12 am-7:29 pm

1 stop7h 17m

Lambert-St Louis

Sun 1/18

6:44 pm-12:27 pm

2 stops18h 43m

$387

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 St. Louis from

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

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 St. Louis?

In general, January is the cheapest month to fly from Colorado to St. Louis. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $168. The month of February is another great option to travel to St. Louis, with average flight prices from Colorado averaging around $177.

What is the cheapest day to depart on your flight to St. Louis?

The cheapest day to depart on your flight to St. Louis is on a Friday when prices can be found for as low as $227. This is often the case because there is less demand to fly during this day of the week. If your travel schedule is flexible, try to avoid departing on a Sunday because tickets tend to average around $319. These prices are subject to change though, so be sure to set up a Price Alert for flights to St. Louis.

What is the cheapest time of day to depart on your flight to St. Louis?

Flying to St. Louis from Colorado in the morning is the least expensive time of day to depart. momondo users have found prices as low as $254 when looking at flights departing in the morning. In the afternoon is when there is more demand to fly to St. Louis, so prices are often more expensive at around $308 per ticket.

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

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

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

You are more likely to see cheaper flights to St. Louis from Colorado when booking weeks ahead of your departure date. In general, you can expect to find flights to St. Louis for around $234 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to St. Louis from Colorado for as low as $165 on momondo.

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

There are 4 cabin classes available to choose from on Colorado to Lambert-St Louis 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 Colorado to St. Louis flights?

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

Cheap Colorado to St. Louis flight deals and tips

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

Best Price Found

$86

Fastest flight time

1h 58m

Direct flights

Every day

Airports in St. Louis

1 airport
The best one-way flight to St. Louis from Colorado in the past 72 hours is $86. The best round-trip flight deal from Colorado to St. Louis found on momondo in the last 72 hours is $188.
The fastest flight from Colorado to St. Louis takes 1h 58m
Direct flights go from Colorado to St. Louis every day.
There is 1 airport in St. Louis. From Colorado there are direct flights to Lambert-St Louis (STL).
Search flight deals

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

    Prices for flights from Colorado to Lambert-St Louis Airport are refreshed on a daily basis.

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

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

    The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Colorado to Lambert-St Louis Airport.

  • What documentation or ID do you need to fly to Lambert-St Louis Airport?

    The required travel and health documents for your Lambert-St Louis Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Lambert-St Louis Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

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

Best airlines flying from Colorado to St. Louis

Compare and see reviews for airlines that fly from Colorado to St. Louis with momondo
Airline
Rating
Free Cancellation
Price
FrontierPriceFrom $54Free CancellationRating
5.8
3,084 reviews
Search Frontier flights
United AirlinesPriceFrom $158Free CancellationRating
7.4
9,095 reviews
Search United Airlines flights
SouthwestPriceFrom $177Free CancellationRating
7.9
4,252 reviews
Search Southwest flights
American AirlinesPriceFrom $227Free CancellationRating
7.2
11,048 reviews
Search American Airlines flights

Traveling to a place near St. Louis?

Book flights to St. Louis if you plan to visit one of these locations
St. Charles
Chesterfield
Hermann
Fairview Heights
Maryland Heights
O'Fallon
Florissant
Fenton
Wentzville
St. Peters
Collinsville
Alton
Farmington
Festus
Clayton
Glencoe
Edwardsville
Eureka
Litchfield
Shrewsbury

Why use momondo?

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

To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to St. Louis from Colorado.

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

Yes. All flights to St. Louis from Colorado on momondo can be compared and filtered by various policies on offer, including flexible booking.

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

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 St. Louis from Colorado.

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

Yes. momondo can track prices for Colorado to St. Louis 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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