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Cheap flights from St. Louis to Denver from $28

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 Denver departing on 1/18. 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 St. Louis to Denver

Cheap round-trip flights

These are some of the best round-trip flight deals from St. Louis to Denver 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 St. Louis to Denver.

Cheap last minute flights

Planning a quick getaway from St. Louis to Denver? 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 Denver, so you can enjoy a seamless trip without layovers.

Cheap bus & train deals from St. Louis to Denver

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

All round-trip flight deals to Denver

The cheapest plane tickets to Denver found on KAYAK recently.
7:09 pm - 8:37 pmSTL-DEN
2h 28mnonstop
6:00 am - 9:16 amDEN-STL
2h 16mnonstop
$57Frontier
Find Deal
Sat, Jan 18 - Wed, Jan 22
7:09 pm - 8:37 pmSTL-DEN
2h 28mnonstop
6:00 am - 9:16 amDEN-STL
2h 16mnonstop
$58Frontier
Find Deal
Sat, Jan 18 - Wed, Jan 22
7:09 pm - 8:37 pmSTL-DEN
2h 28mnonstop
6:00 am - 9:16 amDEN-STL
2h 16mnonstop
$59Frontier
Find Deal
Sat, Jan 18 - Wed, Jan 22
6:49 pm - 8:25 pmSTL-DEN
2h 36mnonstop
6:00 am - 9:06 amDEN-STL
2h 06mnonstop
$67Frontier
Find Deal
Fri, Jan 10 - Sat, Jan 11
1:40 pm - 3:05 pmSTL-DEN
2h 25mnonstop
7:20 pm - 10:20 pmDEN-STL
2h 00mnonstop
$178Southwest
Find Deal
Tue, Jan 14 - Tue, Jan 21
8:00 am - 12:28 pmSTL-DEN
5h 28m1 stop
7:45 am - 2:14 pmDEN-STL
5h 29m1 stop
$196United Airlines
Find Deal
Tue, Jan 28 - Sat, Feb 1
8:15 pm - 9:45 pmSTL-DEN
2h 30mnonstop
7:20 pm - 10:20 pmDEN-STL
2h 00mnonstop
$198Southwest
Find Deal
Thu, Feb 6 - Tue, Feb 11
11:41 am - 5:47 pmSTL-DEN
7h 06m1 stop
9:26 am - 4:23 pmDEN-STL
5h 57m1 stop
$207American Airlines
Find Deal
Sat, Feb 1 - Tue, Feb 4
4:36 pm - 6:13 pmSTL-DEN
2h 37mnonstop
1:25 pm - 4:28 pmDEN-STL
2h 03mnonstop
$237United Airlines
Find Deal
Sat, Jan 11 - Thu, Jan 16
5:00 pm - 10:47 pmSTL-DEN
6h 47m1 stop
4:15 pm - 11:14 pmDEN-STL
5h 59m1 stop
$276Delta
Find Deal
Tue, Jan 7 - Sat, Jan 11
7:09 pm - 8:37 pmSTL-DEN
2h 28mnonstop
$28Frontier
Find Deal
Sat, Jan 18
7:09 pm - 8:37 pmSTL-DEN
2h 28mnonstop
$29Frontier
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Wed, Jan 29
4:36 pm - 6:13 pmSTL-DEN
2h 37mnonstop
$79United Airlines
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Tue, Jan 21
5:30 pm - 9:58 pmSTL-DEN
5h 28m1 stop
$88United Airlines
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Tue, Feb 11
6:00 am - 10:31 amSTL-DEN
5h 31m1 stop
$98Delta
Find Deal
Wed, Jan 29
11:38 am - 3:45 pmSTL-DEN
5h 07m1 stop
$99American Airlines
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Wed, Jan 29
7:40 am - 3:20 pmSTL-DEN
8h 40m1 stop
$108Delta
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Wed, Jan 15
7:40 am - 1:45 pmSTL-DEN
7h 05m2 stops
$153Southwest
Find Deal
Sat, Jan 18
11:05 am - 12:35 pmSTL-DEN
2h 30mnonstop
$164Southwest
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Thu, Jan 16
7:04 am - 5:48 pmSTL-DEN
11h 44m1 stop
$270American Airlines
Find Deal
Tue, Dec 24
6:49 pm - 8:25 pmSTL-DEN
2h 36mnonstop
5:05 am - 8:13 amDEN-STL
2h 08mnonstop
$148Frontier
Find Deal
Mon, Dec 23 - Sat, Dec 28
6:49 pm - 8:25 pmSTL-DEN
2h 36mnonstop
5:05 am - 8:13 amDEN-STL
2h 08mnonstop
$158Frontier
Find Deal
Mon, Dec 23 - Fri, Dec 27
10:09 pm - 11:48 pmSTL-DEN
2h 39mnonstop
5:05 am - 8:13 amDEN-STL
2h 08mnonstop
$166Frontier
Find Deal
Sun, Dec 22 - Fri, Dec 27
6:04 pm - 11:30 pmSTL-DEN
6h 26m1 stop
4:19 pm - 10:06 pmDEN-STL
4h 47m1 stop
$576Delta
Find Deal
Mon, Dec 23 - Sat, Dec 28
8:35 am - 10:13 amSTL-DEN
2h 38mnonstop
6:00 am - 2:24 pmDEN-STL
7h 24m1 stop
$602United Airlines
Find Deal
Sat, Dec 21 - Wed, Jan 1
10:35 am - 2:35 pmSTL-DEN
5h 00m1 stop
6:00 am - 2:24 pmDEN-STL
7h 24m1 stop
$611United Airlines
Find Deal
Sun, Dec 22 - Wed, Jan 1
7:07 pm - 12:11 amSTL-DEN
6h 04m1 stop
5:25 am - 1:20 pmDEN-STL
6h 55m1 stop
$646Delta
Find Deal
Sun, Dec 22 - Tue, Dec 31
5:29 pm - 10:05 pmSTL-DEN
5h 36m1 stop
5:00 am - 10:45 amDEN-STL
4h 45m1 stop
$696American Airlines
Find Deal
Sat, Dec 21 - Thu, Jan 2
9:20 am - 4:40 pmSTL-DEN
32h 20m3 stops
6:20 pm - 4:25 pmDEN-STL
21h 05m3 stops
Fri, Dec 20 - Mon, Dec 23
1:00 pm - 4:40 pmSTL-DEN
28h 40m3 stops
6:20 pm - 4:25 pmDEN-STL
21h 05m3 stops
Thu, Dec 19 - Mon, Dec 23
7:09 pm - 8:37 pmSTL-DEN
2h 28mnonstop
6:00 am - 9:16 amDEN-STL
2h 16mnonstop
$57Frontier
Find Deal
Sat, Jan 18 - Wed, Jan 22
7:09 pm - 8:37 pmSTL-DEN
2h 28mnonstop
6:00 am - 9:16 amDEN-STL
2h 16mnonstop
$58Frontier
Find Deal
Sat, Jan 18 - Wed, Jan 22
7:09 pm - 8:37 pmSTL-DEN
2h 28mnonstop
6:00 am - 9:16 amDEN-STL
2h 16mnonstop
$59Frontier
Find Deal
Sat, Jan 18 - Wed, Jan 22
6:49 pm - 8:25 pmSTL-DEN
2h 36mnonstop
6:00 am - 9:06 amDEN-STL
2h 06mnonstop
$67Frontier
Find Deal
Fri, Jan 10 - Sat, Jan 11
8:15 pm - 9:45 pmSTL-DEN
2h 30mnonstop
9:50 am - 12:55 pmDEN-STL
2h 05mnonstop
$158Southwest
Find Deal
Tue, Feb 18 - Tue, Feb 25
1:40 pm - 3:05 pmSTL-DEN
2h 25mnonstop
7:20 pm - 10:20 pmDEN-STL
2h 00mnonstop
$178Southwest
Find Deal
Tue, Jan 14 - Tue, Jan 21
8:35 pm - 10:05 pmSTL-DEN
2h 30mnonstop
7:20 pm - 10:20 pmDEN-STL
2h 00mnonstop
$198Southwest
Find Deal
Tue, Jan 28 - Thu, Jan 30
4:36 pm - 6:13 pmSTL-DEN
2h 37mnonstop
1:25 pm - 4:28 pmDEN-STL
2h 03mnonstop
$237United Airlines
Find Deal
Sat, Jan 11 - Thu, Jan 16
4:36 pm - 6:13 pmSTL-DEN
2h 37mnonstop
5:37 pm - 8:43 pmDEN-STL
2h 06mnonstop
$257United Airlines
Find Deal
Sat, Jan 18 - Tue, Jan 21
1:45 pm - 3:15 pmSTL-DEN
2h 30mnonstop
5:37 pm - 8:43 pmDEN-STL
2h 06mnonstop
$277United Airlines
Find Deal
Thu, Jan 16 - Tue, Jan 21

Frontier flights from St. Louis to Denver

Our best Frontier deals on St. Louis to Denver flight tickets
Frontier
Jan 18
STL7:09 pmLambert-St Louis
2h 28m
DEN8:37 pmDenver Intl
Jan 22
DEN6:00 amDenver Intl
2h 16m
STL9:16 amLambert-St Louis
Frontier
Jan 18
STL7:09 pmLambert-St Louis
2h 28m
DEN8:37 pmDenver Intl
Jan 22
DEN6:00 amDenver Intl
2h 16m
STL9:16 amLambert-St Louis
Frontier
Jan 18
STL7:09 pmLambert-St Louis
2h 28m
DEN8:37 pmDenver Intl
Jan 22
DEN6:00 amDenver Intl
2h 16m
STL9:16 amLambert-St Louis

United Airlines flights from St. Louis to Denver

Our best United Airlines deals on St. Louis to Denver flight tickets
United Airlines
Jan 28
STL8:00 amLambert-St Louis
5h 28m
1 stop
DEN12:28 pmDenver Intl
Feb 1
DEN7:45 amDenver Intl
5h 29m
1 stop
STL2:14 pmLambert-St Louis
United Airlines
Jan 11
STL4:36 pmLambert-St Louis
2h 37m
DEN6:13 pmDenver Intl
Jan 16
DEN1:25 pmDenver Intl
2h 03m
STL4:28 pmLambert-St Louis
United Airlines
Jan 18
STL4:36 pmLambert-St Louis
2h 37m
DEN6:13 pmDenver Intl
Jan 21
DEN5:37 pmDenver Intl
2h 06m
STL8:43 pmLambert-St Louis

See travel insights to Denver from

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

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

What is the cheapest month to fly to Denver?

The cheapest month to fly to Denver from St. Louis is in April. Flight prices, which tend to average around $135, are often lower during this time because this is during the off-season. If you don’t want to visit Denver in April, then you should wait until May to fly from St. Louis, when ticket prices are also cheap, with an average price of $148.

What is the cheapest day to depart on your flight to Denver?

The cheapest day to depart on your flight to Denver is on a Tuesday when prices can be found for as low as $131. This is often the case because there is less demand to fly during this day of the week. The most expensive day to fly to Denver is Sunday, with ticket prices averaging around $228.

What is the cheapest time of day to depart on your flight to Denver?

The cheapest time of day to fly to Denver is in the evening when flights can be purchased for as low as $112. Flights at noon are often more expensive with an average ticket price of $301.

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

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

How far in advance should I book a flight to Denver?

The best time to book a flight to Denver from St. Louis is 23 days out, which is when prices tend to be around $168. Don’t hesitate to check prices now though because momondo users recently found tickets for as low as $80.

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

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

You could potentially save up to 89% on your flight if you consider stops on a St. Louis to Denver flight.

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

As of December 2024, prices for St. Louis to Denver flights are approximately 39% more expensive when compared to flights at the same time last year.

When to book flights from St. Louis to Denver

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

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

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

Best Price Found

$28

Fastest flight time

2h 25m

Direct flights

Every day

Airports in Denver

1 airport
The best one-way flight to Denver from St. Louis in the past 72 hours is $28. The best round-trip flight deal from St. Louis to Denver found on momondo in the last 72 hours is $57.
The fastest flight from St. Louis to Denver takes 2h 25m
Direct flights go from St. Louis to Denver every day.
There is 1 airport near Denver: Denver Intl (DEN)

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

    The straight-line distance from Lambert-St Louis to Denver Intl is 794.2 mi. Typically, this will take 2h 25m by plane in normal conditions.

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

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

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

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

    The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Lambert-St Louis Airport to Denver Intl Airport.

  • What documentation or ID do you need to fly to Denver Intl Airport?

    The necessary travel and health documents for your Denver Intl 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 St. Louis to Denver?

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


Best airlines flying from St. Louis to Denver

Compare and see reviews for airlines that fly from St. Louis to Denver with momondo
Airline
Rating
Free Cancellation
Price
FrontierPriceFrom $46Free CancellationRating
6.1
3,479 reviews
Search Frontier flights
United AirlinesPriceFrom $149Free CancellationRating
7.4
9,055 reviews
Search United Airlines flights
SouthwestPriceFrom $160Free CancellationRating
8.1
4,848 reviews
Search Southwest flights
DeltaPriceFrom $168Free CancellationRating
8.0
8,604 reviews
Search Delta flights
American AirlinesPriceFrom $192Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
  • Southwest Flights From St. Louis to Denver

    The lowest priced Southwest flight from St. Louis to Denver from the last 72 hours was $160. Generally, Southwest has 18 flights on this route every week with an average price of $278. Southwest is rated 8.1/10 by our users.

  • United Airlines Flights From St. Louis to Denver

    Across 9,059 United Airlines reviews on momondo, the average score is 7.4/10. United Airlines flies from St. Louis to Denver about 4 times each week, with ticket deals ranging from $149 to $313. Price data is based on momondo searches in the last 72 hours.


Why use momondo?

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

Finding the right flight to Denver from St. Louis is quick and easy when you have a range of options in front of you, from reputable agents and recognisable airlines. Options that can then be filtered down to find the best fit. That is what momondo does. We make finding flights to Denver quick and easy, saving you time and money.

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

momondo does allow users to show only those flights to Denver from St. Louis which offer a flexible booking policy as well as other useful filters and features.

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

momondo provides multiple filters to help you find the best flight to Denver from St. Louis. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.

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

Of course. momondo tracks the price of St. Louis to Denver flights. All you need is a valid email address and we will do the rest; it is that quick and easy.


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