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Cheap flights from Denver to St. Louis 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 Denver to St. Louis departing on 12/18. 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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Find the cheapest flights from Denver to St. Louis

Cheap round-trip flights

These are some of the best round-trip flight deals from Denver to St. Louis that have been recently found on momondo from popular airlines, departing in the coming months.

Cheap one-way flights

Flying one-way? These are some of the best deals recently discovered on momondo for flights from Denver to St. Louis.

Cheap last minute flights

Planning a quick getaway from Denver to St. Louis? These are the last-minute flight deals available now.

Cheap direct flights

If you prefer a non-stop journey, check out our latest direct flight deals to St. Louis, so you can enjoy a seamless trip without layovers.

Cheap bus & train deals from Denver to St. Louis

Find recent round-trip train or bus tickets from Denver to St. Louis.

All round-trip flight deals to St. Louis

The cheapest plane tickets to St. Louis found on KAYAK recently.
5:05 am - 8:13 amDEN-STL
2h 08mnonstop
6:46 pm - 8:22 pmSTL-DEN
2h 36mnonstop
$67Frontier
Find Deal
Wed, Dec 11 - Fri, Dec 13
5:05 am - 8:13 amDEN-STL
2h 08mnonstop
6:46 pm - 8:22 pmSTL-DEN
2h 36mnonstop
$68Frontier
Find Deal
Wed, Dec 4 - Wed, Dec 11
9:40 am - 12:48 pmDEN-STL
2h 08mnonstop
8:27 am - 10:05 amSTL-DEN
2h 38mnonstop
$197United Airlines
Find Deal
Sun, Jan 26 - Fri, Jan 31
7:10 pm - 10:16 pmDEN-STL
2h 06mnonstop
4:43 pm - 6:20 pmSTL-DEN
2h 37mnonstop
$207United Airlines
Find Deal
Thu, Dec 19 - Tue, Dec 24
6:05 pm - 12:38 amDEN-STL
5h 33m1 stop
2:00 pm - 7:43 pmSTL-DEN
6h 43m1 stop
$216Delta
Find Deal
Sun, Jan 26 - Fri, Jan 31
2:23 pm - 10:26 pmDEN-STL
7h 03m1 stop
7:05 pm - 12:24 amSTL-DEN
6h 19m1 stop
$236Delta
Find Deal
Wed, Dec 11 - Fri, Dec 13
6:45 pm - 9:45 pmDEN-STL
2h 00mnonstop
6:35 am - 8:00 amSTL-DEN
2h 25mnonstop
$248Southwest
Find Deal
Mon, Dec 9 - Thu, Dec 12
9:26 am - 3:15 pmDEN-STL
4h 49m1 stop
5:45 am - 10:14 amSTL-DEN
5h 29m1 stop
$276American Airlines
Find Deal
Sat, Dec 7 - Sun, Dec 8
5:00 am - 10:46 amDEN-STL
4h 46m1 stop
5:45 am - 10:14 amSTL-DEN
5h 29m1 stop
$278American Airlines
Find Deal
Wed, Dec 4 - Sun, Dec 8
12:25 pm - 8:05 pmDEN-STL
6h 40m2 stops
8:30 pm - 12:40 amSTL-DEN
5h 10m1 stop
$321Southwest
Find Deal
Sat, Dec 7 - Sun, Dec 8
5:05 am - 8:13 amDEN-STL
2h 08mnonstop
$34Frontier
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Wed, Dec 18
5:05 am - 8:13 amDEN-STL
2h 08mnonstop
$38Frontier
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Sat, Dec 7
7:47 am - 2:36 pmDEN-STL
5h 49m1 stop
$88United Airlines
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Wed, Feb 19
5:20 pm - 8:26 pmDEN-STL
2h 06mnonstop
$99United Airlines
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Tue, Dec 24
12:55 am - 9:22 amDEN-STL
7h 27m1 stop
$108Delta
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Fri, Dec 13
7:00 am - 3:30 pmDEN-STL
7h 30m1 stop
$118American Airlines
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Thu, Dec 12
12:55 am - 9:22 amDEN-STL
7h 27m1 stop
$128Delta
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Fri, Dec 6
8:20 pm - 11:20 pmDEN-STL
2h 00mnonstop
$139Southwest
Find Deal
Thu, Dec 12
10:25 am - 7:35 pmDEN-STL
8h 10m2 stops
$143Southwest
Find Deal
Sat, Feb 8
5:00 am - 10:46 amDEN-STL
4h 46m1 stop
$278American Airlines
Find Deal
Mon, Dec 2
9:30 am - 12:34 pmDEN-STL
2h 04mnonstop
5:02 pm - 8:39 amSTL-DEN
16h 37m1 stop
$281Frontier
Find Deal
Sun, Nov 24 - Tue, Dec 3
9:03 pm - 12:06 amDEN-STL
2h 03mnonstop
5:02 pm - 11:35 pmSTL-DEN
7h 33m1 stop
$283Frontier
Find Deal
Thu, Nov 21 - Tue, Dec 3
5:43 pm - 8:45 pmDEN-STL
2h 02mnonstop
4:31 pm - 6:02 pmSTL-DEN
2h 31mnonstop
$557United Airlines
Find Deal
Thu, Nov 21 - Tue, Dec 3
5:43 pm - 8:45 pmDEN-STL
2h 02mnonstop
8:30 am - 10:00 amSTL-DEN
2h 30mnonstop
$567United Airlines
Find Deal
Sun, Nov 24 - Thu, Dec 5
8:15 am - 11:15 amDEN-STL
2h 00mnonstop
4:45 pm - 6:10 pmSTL-DEN
2h 25mnonstop
$598Southwest
Find Deal
Sun, Nov 24 - Tue, Dec 3
2:25 pm - 9:55 pmDEN-STL
6h 30m1 stop
10:21 am - 4:12 pmSTL-DEN
6h 51m1 stop
$611Delta
Find Deal
Fri, Nov 22 - Tue, Dec 3
12:55 am - 9:09 amDEN-STL
7h 14m1 stop
7:40 am - 3:07 pmSTL-DEN
8h 27m1 stop
$631Delta
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Sat, Nov 23 - Thu, Dec 5
7:00 am - 1:30 pmDEN-STL
29h 30m3 stops
9:50 am - 7:24 amSTL-DEN
22h 34m3 stops
Sun, Nov 24 - Tue, Nov 26
7:00 am - 1:30 pmDEN-STL
29h 30m3 stops
9:20 am - 4:40 pmSTL-DEN
32h 20m3 stops
Sun, Nov 24 - Mon, Dec 2
6:10 am - 9:20 amDEN-STL
2h 10mnonstop
11:55 am - 1:20 pmSTL-DEN
2h 25mnonstop
$813Southwest
Find Deal
Thu, Nov 21 - Thu, Nov 21
5:05 am - 8:13 amDEN-STL
2h 08mnonstop
6:46 pm - 8:22 pmSTL-DEN
2h 36mnonstop
$67Frontier
Find Deal
Wed, Dec 11 - Fri, Dec 13
5:05 am - 8:13 amDEN-STL
2h 08mnonstop
6:46 pm - 8:22 pmSTL-DEN
2h 36mnonstop
$68Frontier
Find Deal
Wed, Dec 4 - Wed, Dec 11
6:00 am - 9:16 amDEN-STL
2h 16mnonstop
7:09 pm - 8:37 pmSTL-DEN
2h 28mnonstop
$72Frontier
Find Deal
Sat, Jan 18 - Mon, Jan 20
5:05 am - 8:13 amDEN-STL
2h 08mnonstop
6:46 pm - 8:22 pmSTL-DEN
2h 36mnonstop
$89Frontier
Find Deal
Wed, Dec 11 - Fri, Dec 13
9:40 am - 12:48 pmDEN-STL
2h 08mnonstop
8:27 am - 10:05 amSTL-DEN
2h 38mnonstop
$197United Airlines
Find Deal
Sun, Jan 26 - Fri, Jan 31
7:10 pm - 10:16 pmDEN-STL
2h 06mnonstop
4:43 pm - 6:20 pmSTL-DEN
2h 37mnonstop
$207United Airlines
Find Deal
Thu, Dec 19 - Tue, Dec 24
6:45 pm - 9:45 pmDEN-STL
2h 00mnonstop
6:35 am - 8:00 amSTL-DEN
2h 25mnonstop
$248Southwest
Find Deal
Mon, Dec 9 - Thu, Dec 12
9:40 am - 12:43 pmDEN-STL
2h 03mnonstop
8:30 am - 10:00 amSTL-DEN
2h 30mnonstop
$257United Airlines
Find Deal
Sat, Dec 7 - Sun, Dec 8
8:20 pm - 11:20 pmDEN-STL
2h 00mnonstop
5:30 am - 7:00 amSTL-DEN
2h 30mnonstop
$278Southwest
Find Deal
Fri, Dec 6 - Sun, Dec 8
6:45 pm - 9:45 pmDEN-STL
2h 00mnonstop
10:50 pm - 12:15 amSTL-DEN
2h 25mnonstop
$408Southwest
Find Deal
Tue, Dec 24 - Thu, Dec 26

Frontier flights from Denver to St. Louis

Our best Frontier deals on Denver to St. Louis flight tickets
Frontier
Dec 11
DEN5:05 amDenver Intl
2h 08m
STL8:13 amLambert-St Louis
Dec 13
STL6:46 pmLambert-St Louis
2h 36m
DEN8:22 pmDenver Intl
Frontier
Dec 4
DEN5:05 amDenver Intl
2h 08m
STL8:13 amLambert-St Louis
Dec 11
STL6:46 pmLambert-St Louis
2h 36m
DEN8:22 pmDenver Intl
Frontier
Jan 18
DEN6:00 amDenver Intl
2h 16m
STL9:16 amLambert-St Louis
Jan 20
STL7:09 pmLambert-St Louis
2h 28m
DEN8:37 pmDenver Intl

United Airlines flights from Denver to St. Louis

Our best United Airlines deals on Denver to St. Louis flight tickets
United Airlines
Jan 26
DEN9:40 amDenver Intl
2h 08m
STL12:48 pmLambert-St Louis
Jan 31
STL8:27 amLambert-St Louis
2h 38m
DEN10:05 amDenver Intl
United Airlines
Dec 19
DEN7:10 pmDenver Intl
2h 06m
STL10:16 pmLambert-St Louis
Dec 24
STL4:43 pmLambert-St Louis
2h 37m
DEN6:20 pmDenver Intl
United Airlines
Dec 19
DEN7:50 amDenver Intl
5h 34m
1 stop
STL2:24 pmLambert-St Louis
Dec 24
STL8:35 amLambert-St Louis
2h 38m
DEN10:13 amDenver Intl

See travel insights to St. Louis from

How to get the cheapest flight ticket from Denver 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 from Denver to St. Louis?

January. The cheapest time of year to fly to St. Louis from Denver is January. Most expensive is November

What is the cheapest day to depart Denver for St. Louis?

Wednesday. The cheapest day of the week is typically Wednesday. The most expensive is typically Sunday

When is the cheapest time to fly from Denver to St. Louis?

In the evening. Denver to St. Louis flights are approximately 49% more expensive at noon than in the evening

What is the cheapest Denver to St. Louis flight route?

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

How far in advance should you book Denver to St. Louis flights?

58 days before. The cheapest time to buy a flight from Denver to St. Louis is approximately 58 days to departure

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

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

How have Denver to St. Louis flight prices changed over time?

As of November 2024, prices for Denver to St. Louis flights are approximately 71% more expensive when compared to flights at the same time last year.

What is the typical price of a round-trip flight between Denver and St. Louis?


When to book flights from Denver to St. Louis

Are you open to changing your travel dates? Check out the ideal times to fly from Denver to St. Louis according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Denver to St. Louis (DEN to STL) flight deals and tips

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

Best Price Found

$34

Fastest flight time

1h 58m

Direct flights

Every day

Airports in St. Louis

1 airport
The best one-way flight to St. Louis from Denver in the past 72 hours is $34. The best round-trip flight deal from Denver to St. Louis found on momondo in the last 72 hours is $67.
The fastest flight from Denver to St. Louis takes 1h 58m
Direct flights go from Denver to St. Louis every day.
There is 1 airport near St. Louis: Lambert-St Louis (STL)

  • How far is Denver Intl to Lambert-St Louis by plane?

    The distance between Denver Intl and Lambert-St Louis is about 794.2 mi. A reasonable flight in good conditions will take 1h 58m.

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

    Prices for flights from Denver Intl Airport to Lambert-St Louis Airport were last updated today.

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

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

    The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Denver Intl Airport to Lambert-St Louis Airport.

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

    The necessary travel and health documents for your Lambert-St Louis Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

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

  • What is the most popular airline from Denver to St. Louis?


Best airlines flying from Denver to St. Louis

Compare and see reviews for airlines that fly from Denver to St. Louis with momondo
Airline
Rating
Free Cancellation
Price
FrontierPriceFrom $51Free CancellationRating
6.1
3,539 reviews
Search Frontier flights
SouthwestPriceFrom $140Free CancellationRating
8.1
5,015 reviews
Search Southwest flights
United AirlinesPriceFrom $149Free CancellationRating
7.4
9,173 reviews
Search United Airlines flights
  • Southwest Flights From Denver to St. Louis

    Southwest is one of the most popular airlines flying from Denver to St. Louis, operating 28 flights/week on average for this route. A good Southwest flight deal for Denver to St. Louis starts from $140 round-trip, up to an average price of $278. Our users have rated Southwest at 8.1/10.

  • United Airlines Flights From Denver to St. Louis

    Another popular option for Denver to St. Louis flights is United Airlines (7.4/10, 9,173 ratings). United Airlines flies from Denver to St. Louis around 14 times per week, with deals starting from $149 round-trip and rising to an average price of around $315.


Why use momondo?

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

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from Denver to St. Louis. momondo saves you time and could save you money on your trip.

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

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

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

Once you have performed a search for Denver to St. Louis flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.

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

If you are simply researching potential flights to St. Louis, momondo offers a useful price alert feature which will track prices for flights to St. Louis from Denver and alert you when they change.


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