Flights from St. Louis to Denver

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Our cheapest offers for flights from St. Louis to Denver

Here you can compare cheap flights from St. Louis (STL) to Denver (DEN) for one-way or return trips. The following offers were searched for and found on idealo during the last few days. Or start your own flight search to Denver. Prices and availability may change at any time.

Outbound Return Airlines Shop Baggage Price
Best option
St. Louis
Denver
Outbound
04/26/25
direct
UA2625
02h 30min
Return
05/23/25
1 Stopover (ORD)
UA0532, UA2100
07h 03min
United Airlines ?
$306
St. Louis
Denver
Outbound
04/26/25
direct
UA2625
02h 30min
Return
05/23/25
direct
UA0758
01h 58min
United Airlines ?
$1,185
St. Louis
Denver
Outbound
04/26/25
direct
UA2625
02h 30min
Return
05/23/25
1 Stopover (ORD)
UA0532, UA2100
07h 03min
United Airlines ?
$322
St. Louis
Denver
Outbound
04/26/25
direct
UA0464
02h 29min
Return
05/23/25
1 Stopover (ORD)
UA0532, UA2100
07h 03min
United Airlines ?
$337
St. Louis
Denver
Outbound
04/26/25
1 Stopover (CLT)
AA0858, AA1283
08h 05min
Return
05/23/25
1 Stopover (CLT)
AA2878, AA2497
08h 47min
American Airlines ?
$515
St. Louis
Denver
Outbound
04/26/25
1 Stopover (SEA)
AS0388, AS0642
08h 44min
Return
05/23/25
1 Stopover (SEA)
AS0682, AS0472
10h 21min
Alaska Airlines ?
$579
Prices based on recent searches, subject to last-minute changes
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Tips and tricks to help you find cheap flights from St. Louis to Denver

Favorite airline: Frontier Airlines
100 % of bookings on this flight route are made with Frontier Airlines, United Airlines and Delta.
Frontier Airlines
55 %
United Airlines
36 %
Delta
9 %
Direct flights are cheaper
Direct flights on this route are $162.00 cheaper on average than flights with a stopover.
non stop flight
1 stop
02h 28min
08h 30min
$117
$279
The favorite connection is non-stop
Non-stop flights are especially popular on this route. 88 % of travelers will book a direct flight.
Route
bookings
Direct flights
02h 28min, from $117
88 %
1 stopover Detroit Metropolitan Wayne County Airport, MI
08h 30min, from $279
12 %

Important flight information

Flight information: St. Louis - Denver

Roundtrip from $305.73
Flight duration min. 02:20 / max. 11:15
Return flight duration min. 01:50/ max. 07:30
Distance 1237 km
Flights per week 123
Departure airport Airport St. Louis - Lambert International Airport (STL)
Arrival airport Airport Denver International Airport, CO (DEN)
Destination country Flights to United States
Alternative routes to United States
Alternative flights to Denver
Flight destinations with a similar price
Flight destinations with a similar price
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* Prices may vary, please check the travel details given by the online travel agency before booking. Prices include taxes.