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Cheap flights from St. Louis to Denver from $33

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 9/16. 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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Sun 6/23
Sun 6/30

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Easily compare round-trip flights from St. Louis to Denver

Below you can see the best fares for your round-trip flight route over the next six months. All fares were found on momondo this week. Browse the quickest and cheapest flights from St. Louis to Denver by changing tabs
Frontier
Aug 28
STL8:00 pmLambert-St Louis
2h 28m
DEN9:28 pmDenver Intl
Aug 31
DEN6:26 amDenver Intl
2h 11m
STL9:37 amLambert-St Louis
Frontier
Aug 14
STL8:00 pmLambert-St Louis
2h 28m
DEN9:28 pmDenver Intl
Aug 17
DEN6:26 amDenver Intl
2h 11m
STL9:37 amLambert-St Louis
Frontier
Sep 12
STL3:53 pmLambert-St Louis
2h 24m
DEN5:17 pmDenver Intl
Sep 14
DEN6:26 amDenver Intl
2h 11m
STL9:37 amLambert-St Louis
Frontier
Aug 21
STL8:00 pmLambert-St Louis
2h 28m
DEN9:28 pmDenver Intl
Aug 25
DEN11:46 amDenver Intl
2h 07m
STL2:53 pmLambert-St Louis
Multiple Airlines
Jul 5
STL10:24 amLambert-St Louis
8h 25m
1 stop
DEN5:49 pmDenver Intl
Jul 10
DEN6:15 amDenver Intl
2h 10m
STL9:25 amLambert-St Louis
Frontier
Aug 20
STL10:32 pmLambert-St Louis
2h 29m
DEN12:01 amDenver Intl
Aug 29
DEN11:46 amDenver Intl
2h 07m
STL2:53 pmLambert-St Louis

Find the cheapest one-way flights from St. Louis to Denver

If you're looking for one-way flights from St. Louis to Denver, view some of our deals below provided by Frontier and United Airlines
Frontier
Sep 16
STL8:00 pmLambert-St Louis
2h 28m
DEN9:28 pmDenver Intl
Frontier
Jul 13
STL8:02 pmLambert-St Louis
2h 23m
DEN9:25 pmDenver Intl
United Airlines
Aug 17
STL5:30 pmLambert-St Louis
6h 22m
1 stop
DEN10:52 pmDenver Intl

Find the cheapest direct flights from St. Louis to Denver

Frontier
Aug 28
STL8:00 pmLambert-St Louis
2h 28m
DEN9:28 pmDenver Intl
Aug 31
DEN6:26 amDenver Intl
2h 11m
STL9:37 amLambert-St Louis
Frontier
Aug 14
STL8:00 pmLambert-St Louis
2h 28m
DEN9:28 pmDenver Intl
Aug 17
DEN6:26 amDenver Intl
2h 11m
STL9:37 amLambert-St Louis
Frontier
Sep 12
STL3:53 pmLambert-St Louis
2h 24m
DEN5:17 pmDenver Intl
Sep 14
DEN6:26 amDenver Intl
2h 11m
STL9:37 amLambert-St Louis
Frontier
Aug 21
STL8:00 pmLambert-St Louis
2h 28m
DEN9:28 pmDenver Intl
Aug 25
DEN11:46 amDenver Intl
2h 07m
STL2:53 pmLambert-St Louis
Frontier
Aug 20
STL10:32 pmLambert-St Louis
2h 29m
DEN12:01 amDenver Intl
Aug 29
DEN11:46 amDenver Intl
2h 07m
STL2:53 pmLambert-St Louis
Frontier
Sep 21
STL8:00 pmLambert-St Louis
2h 28m
DEN9:28 pmDenver Intl
Sep 25
DEN6:26 amDenver Intl
2h 11m
STL9:37 amLambert-St Louis

Search last-minute flights to Denver from St. Louis

Find and compare round-trip flight prices for your last-minute flight from St. Louis to Denver
Frontier
Jun 25
STL3:47 pmLambert-St Louis
2h 29m
DEN5:16 pmDenver Intl
Jul 1
DEN6:20 amDenver Intl
2h 09m
STL9:29 amLambert-St Louis
Frontier
Jun 24
STL8:22 pmLambert-St Louis
2h 30m
DEN9:52 pmDenver Intl
Jun 25
DEN11:39 amDenver Intl
2h 08m
STL2:47 pmLambert-St Louis
Multiple Airlines
Jun 27
STL7:29 pmLambert-St Louis
9h 26m
1 stop
DEN3:55 amDenver Intl
Jul 4
DEN5:50 pmDenver Intl
14h 39m
1 stop
STL9:29 amLambert-St Louis
Frontier
Jun 28
STL5:36 pmLambert-St Louis
2h 24m
DEN7:00 pmDenver Intl
Jul 2
DEN11:39 amDenver Intl
2h 08m
STL2:47 pmLambert-St Louis
Delta
Jun 25
STL6:06 amLambert-St Louis
5h 53m
1 stop
DEN10:59 amDenver Intl
Jun 30
DEN12:55 amDenver Intl
7h 14m
1 stop
STL9:09 amLambert-St Louis
Frontier
Jun 25
STL3:47 pmLambert-St Louis
2h 29m
DEN5:16 pmDenver Intl
Jun 29
DEN6:20 amDenver Intl
2h 09m
STL9:29 amLambert-St Louis

Frontier flights from St. Louis to Denver

Our best Frontier deals on St. Louis to Denver flight tickets
Frontier
Aug 28
STL8:00 pmLambert-St Louis
2h 28m
DEN9:28 pmDenver Intl
Aug 31
DEN6:26 amDenver Intl
2h 11m
STL9:37 amLambert-St Louis
Frontier
Aug 14
STL8:00 pmLambert-St Louis
2h 28m
DEN9:28 pmDenver Intl
Aug 17
DEN6:26 amDenver Intl
2h 11m
STL9:37 amLambert-St Louis
Frontier
Sep 12
STL3:53 pmLambert-St Louis
2h 24m
DEN5:17 pmDenver Intl
Sep 14
DEN6:26 amDenver Intl
2h 11m
STL9:37 amLambert-St Louis

Sun Country Air flights from St. Louis to Denver

Our best Sun Country Air deals on St. Louis to Denver flight tickets
Sun Country Air
Jul 12
STL5:25 pmLambert-St Louis
17h 04m
1 stop
DEN9:29 amDenver Intl
Jul 15
DEN6:40 pmDenver Intl
16h 44m
1 stop
STL12:24 pmLambert-St Louis
Sun Country Air
Jul 21
STL5:33 pmLambert-St Louis
25h 23m
1 stop
DEN5:56 pmDenver Intl
Jul 28
DEN7:35 pmDenver Intl
19h 34m
1 stop
STL4:09 pmLambert-St Louis

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 cheapest month to fly from St. Louis to Denver?

October. The cheapest time of year to fly to Denver from St. Louis is October. Most expensive is December

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

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

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

In the evening. St. Louis to Denver flights are approximately 58% more expensive at noon than in the evening

What is the cheapest airline that flies to Denver from St. Louis?

Frontier. American Airlines, Delta, and Frontier are the most popular carriers operating from St. Louis to Denver

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

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

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

27 days before. The cheapest time to buy a flight from St. Louis to Denver is approximately 27 days to departure

How many flights depart from St. Louis to Denver on average per day?

As of June 2024, there are 18 flights per week flying from St. Louis to Denver. The most common time of day flights depart is 3:00PM, with 50% of flights taking off in the afternoon.

How many flights depart from St. Louis to Denver on average per week?

129 flights are operational weekly from St. Louis to Denver as of June 2024. The most popular departure day for this route is Monday, with 17% of flights per week taking off on this day.

What cabin class options are available on St. Louis to Denver flights?

There are 3 cabin classes available to choose from on St. Louis to Denver 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?

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

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

$33

Fastest flight time

2h 18m

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 $33. The best round-trip flight deal from St. Louis to Denver found on momondo in the last 72 hours is $47.
The fastest flight from St. Louis to Denver takes 2h 18m
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 18m 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.


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 $38Free CancellationRating
6.2
3,939 reviews
Search Frontier flights
United AirlinesPriceFrom $119Free CancellationRating
7.4
10,000 reviews
Search United Airlines flights
DeltaPriceFrom $182Free CancellationRating
8.0
10,000 reviews
Search Delta flights
American AirlinesPriceFrom $193Free CancellationRating
7.3
10,000 reviews
Search American Airlines flights
  • United Airlines Flights From St. Louis to Denver

    The lowest priced United Airlines flight from St. Louis to Denver from the last 72 hours was $119. Generally, United Airlines has 26 flights on this route every week with an average price of $298. United Airlines is rated 7.4/10 by our users.

  • Frontier Flights From St. Louis to Denver

    Across 3,939 Frontier reviews on momondo, the average score is 6.2/10. Frontier flies from St. Louis to Denver about 4 times each week, with ticket deals ranging from $38 to $111. 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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Sun 6/23
Sun 6/30
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