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Cheap flights from Colorado to St. Louis from $41

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 12/20. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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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
7:05 am - 10:14 amDEN-STL
2h 09mnonstop
Frontier Logo
7:43 pm - 9:15 pmSTL-DEN
2h 32mnonstop
$93Frontier
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Sat, Dec 13 - Mon, Dec 15
Frontier Logo
6:50 am - 10:02 amDEN-STL
2h 12mnonstop
Frontier Logo
7:43 pm - 9:17 pmSTL-DEN
2h 34mnonstop
$97Frontier
Find Deal
Fri, Nov 21 - Sat, Nov 22
Frontier Logo
6:50 am - 10:02 amDEN-STL
2h 12mnonstop
Frontier Logo
7:57 pm - 9:31 pmSTL-DEN
2h 34mnonstop
$98Frontier
Find Deal
Fri, Nov 21 - Sun, Nov 23
Multiple Airlines Logo
4:08 pm - 2:29 pmDEN-STL
45h 21m2 stops
Multiple Airlines Logo
7:43 pm - 9:17 pmSTL-DEN
2h 34mnonstop
$155Multiple Airlines
Find Deal
Tue, Nov 18 - Fri, Nov 21
Delta Logo
1:53 pm - 11:40 pmHDN-STL
8h 47m1 stop
Delta Logo
8:50 am - 2:46 pmSTL-HDN
6h 56m1 stop
$217Delta
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Tue, Mar 10 - Wed, Mar 11
American Airlines Logo
6:00 am - 1:40 pmDRO-STL
6h 40m1 stop
American Airlines Logo
5:17 am - 9:51 amSTL-DRO
5h 34m1 stop
$248American Airlines
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Thu, Nov 20 - Mon, Nov 24
United Airlines Logo
1:35 pm - 10:45 pmGJT-STL
8h 10m2 stops
United Airlines Logo
4:43 pm - 9:58 pmSTL-GJT
6h 15m1 stop
$264United Airlines
Find Deal
Wed, Nov 19 - Sun, Nov 23
United Airlines Logo
11:00 am - 4:28 pmDRO-STL
4h 28m1 stop
United Airlines Logo
4:37 pm - 10:14 pmSTL-DRO
6h 37m1 stop
$270United Airlines
Find Deal
Tue, Dec 9 - Sat, Dec 13
Delta Logo
6:00 pm - 8:24 amCOS-STL
13h 24m2 stops
Delta Logo
6:00 am - 12:36 pmSTL-COS
7h 36m1 stop
$298Delta
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Thu, Dec 4 - Sun, Dec 7
American Airlines Logo
4:04 pm - 11:51 pmEGE-STL
6h 47m1 stop
American Airlines Logo
7:00 am - 11:50 amSTL-EGE
5h 50m1 stop
$319American Airlines
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Fri, Feb 27 - Tue, Mar 3

Frontier flights from Colorado to St. Louis

Our best Frontier deals on Colorado to St. Louis flight tickets
Frontier
Dec 13
DEN7:05 amDenver Intl
2h 09m
STL10:14 amLambert-St Louis
Dec 15
STL7:43 pmLambert-St Louis
2h 32m
DEN9:15 pmDenver Intl
$93
Find similar
Frontier
Nov 21
DEN6:50 amDenver Intl
2h 12m
STL10:02 amLambert-St Louis
Nov 22
STL7:43 pmLambert-St Louis
2h 34m
DEN9:17 pmDenver Intl
$97
Find similar
Frontier
Nov 21
DEN6:50 amDenver Intl
2h 12m
STL10:02 amLambert-St Louis
Nov 23
STL7:57 pmLambert-St Louis
2h 34m
DEN9:31 pmDenver Intl
$98
Find similar

United Airlines flights from Colorado to St. Louis

Our best United Airlines deals on Colorado to St. Louis flight tickets
United Airlines
Nov 19
GJT1:35 pmGrand Junction Regnl
8h 10m
2 stops
STL10:45 pmLambert-St Louis
Nov 23
STL4:43 pmLambert-St Louis
6h 15m
1 stop
GJT9:58 pmGrand Junction Regnl
$264
Find similar
United Airlines
Dec 9
DRO11:00 amDurango La Plata County
4h 28m
1 stop
STL4:28 pmLambert-St Louis
Dec 13
STL4:37 pmLambert-St Louis
6h 37m
1 stop
DRO10:14 pmDurango La Plata County
$270
Find similar
United Airlines
Feb 28
DRO7:00 amDurango La Plata County
5h 14m
1 stop
STL1:14 pmLambert-St Louis
Mar 3
STL7:41 amLambert-St Louis
10h 15m
2 stops
DRO4:56 pmDurango La Plata County
$276
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 November 6, 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

Sat 12/13

7:05 am-10:14 am

Nonstop2h 09m

Lambert-St Louis

Mon 12/15

7:43 pm-9:15 pm

Nonstop2h 32m

$93

DenverSt. Louis

DEN - STL

DENSTL

Denver Intl

Fri 11/21

6:50 am-10:02 am

Nonstop2h 12m

Lambert-St Louis

Sat 11/22

7:43 pm-9:17 pm

Nonstop2h 34m

$97

DenverSt. Louis

DEN - STL

DENSTL

Denver Intl

Fri 11/21

6:50 am-10:02 am

Nonstop2h 12m

Lambert-St Louis

Sun 11/23

7:57 pm-9:31 pm

Nonstop2h 34m

$98

DenverSt. Louis

DEN - STL

DENSTL

Denver Intl

Tue 11/18

4:08 pm-2:29 pm

2 stops45h 21m

Lambert-St Louis

Fri 11/21

7:43 pm-9:17 pm

Nonstop2h 34m

$155

HaydenSt. Louis

HDN - STL

HDNSTL

Hayden Yampa Valley

Tue 3/10

1:53 pm-11:40 pm

1 stop8h 47m

Lambert-St Louis

Wed 3/11

8:50 am-2:46 pm

1 stop6h 56m

$217

DurangoSt. Louis

DRO - STL

DROSTL

Durango La Plata County

Thu 11/20

6:00 am-1:40 pm

1 stop6h 40m

Lambert-St Louis

Mon 11/24

5:17 am-9:51 am

1 stop5h 34m

$248

Grand JunctionSt. Louis

GJT - STL

GJTSTL

Grand Junction Regnl

Wed 11/19

1:35 pm-10:45 pm

2 stops8h 10m

Lambert-St Louis

Sun 11/23

4:43 pm-9:58 pm

1 stop6h 15m

$264

DurangoSt. Louis

DRO - STL

DROSTL

Durango La Plata County

Tue 12/9

11:00 am-4:28 pm

1 stop4h 28m

Lambert-St Louis

Sat 12/13

4:37 pm-10:14 pm

1 stop6h 37m

$270

Colorado SpringsSt. Louis

COS - STL

COSSTL

Colorado Springs

Thu 12/4

6:00 pm-8:24 am

2 stops13h 24m

Lambert-St Louis

Sun 12/7

6:00 am-12:36 pm

1 stop7h 36m

$298

VailSt. Louis

EGE - STL

EGESTL

Vail Eagle County

Fri 2/27

4:04 pm-11:51 pm

1 stop6h 47m

Lambert-St Louis

Tue 3/3

7:00 am-11:50 am

1 stop5h 50m

$319

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 $161. The month of February is another great option to travel to St. Louis, with average flight prices from Colorado averaging around $188.

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 $228. 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 $321. 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 $251 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 $309 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 $229 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 $158 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

$101

Fastest flight time

2h 00m

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 $101. The best round-trip flight deal from Colorado to St. Louis found on momondo in the last 72 hours is $206.
The fastest flight from Colorado to St. Louis takes 2h 00m
Direct flights go from Colorado to St. Louis every day.
There is 1 airport near St. Louis: 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 $55Free CancellationRating
5.8
3,116 reviews
Search Frontier flights
United AirlinesPriceFrom $155Free CancellationRating
7.4
9,007 reviews
Search United Airlines flights
SouthwestPriceFrom $177Free CancellationRating
8.0
4,241 reviews
Search Southwest flights
American AirlinesPriceFrom $227Free CancellationRating
7.2
11,040 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
Florissant
Maryland Heights
O'Fallon
Wentzville
Fenton
Collinsville
St. Peters
Alton
Farmington
Festus
Glencoe
Edwardsville
Clayton
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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