Earn point on your loyalty program!arrow arc left

Cheap flights from St Louis (STL) to Denver (DEN)

Know your dates, get live prices in seconds
airplane logo

pin logo

calendar
Departure
calendar backward
Return
airplane logo
1 Adults (11+)
0 Children (2~11)
0 Infants (0~2)
Save up to 31%
Book Flight + Hotel at the same time

How to find the cheapest flight from St Louis (STL) to Denver (DEN)

How to find the cheapest flight from St Louis (STL) to Denver (DEN)
Some placeholder content for the first accordion panel. This panel is shown by default, thanks to the .show class.
How to find the cheapest flight from St Louis (STL) to Denver (DEN)
Some placeholder content for the first accordion panel. This panel is shown by default, thanks to the .show class.
How to find the cheapest flight from St Louis (STL) to Denver (DEN)
Some placeholder content for the first accordion panel. This panel is shown by default, thanks to the .show class.

Cheap flights from St Louis to Denver in November , December 2025

28 Nov - 17 Dec $ 129.00
STL
St Louis
Frontier Airlines
DIRECT
DEN
Denver
DEN
Denver
Frontier Airlines
DIRECT
STL
St Louis
Pick dates
28 Nov - 03 Dec $ 153.00
STL
St Louis
Frontier Airlines
DIRECT
DEN
Denver
DEN
Denver
Frontier Airlines
DIRECT
STL
St Louis
Pick dates
28 Nov - 10 Dec $ 159.00
STL
St Louis
Frontier Airlines
DIRECT
DEN
Denver
DEN
Denver
Frontier Airlines
DIRECT
STL
St Louis
Pick dates

Last minute flights from St Louis to Denver

28 Nov - 01 Dec $ 252.00
STL
St Louis
Frontier Airlines
DIRECT
DEN
Denver
DEN
Denver
Frontier Airlines
1 STOPS
STL
St Louis
Pick dates
28 Nov - 30 Nov $ 296.00
STL
St Louis
Frontier Airlines
DIRECT
DEN
Denver
DEN
Denver
Frontier Airlines
DIRECT
STL
St Louis
Pick dates
24 Nov - 30 Nov $ 807.00
STL
St Louis
United Airlines
DIRECT
DEN
Denver
DEN
Denver
United Airlines
DIRECT
STL
St Louis
Pick dates

One-way flights to Denver from St Louis

7:43 PM - 7:43 PM
Frontier Airlines
0 Stops
2h 34m
STL - DEN
$ 95
Kiwi
Pick dates
7:43 PM - 7:43 PM
Frontier Airlines
0 Stops
2h 34m
STL - DEN
$ 176
Kiwi
Pick dates
9:00 AM - 9:00 AM
United Airlines
0 Stops
2h 28m
STL - DEN
$ 439
Kiwi
Pick dates

How to find the cheapest flight from St Louis (STL) to Denver (DEN)

Related info for your journey
Some placeholder content for the first accordion panel. This panel is shown by default, thanks to the .show class.
How to find the cheapest flight from St Louis (STL) to Denver (DEN)
Some placeholder content for the first accordion panel. This panel is shown by default, thanks to the .show class.
How to find the cheapest flight from St Louis (STL) to Denver (DEN)
Some placeholder content for the first accordion panel. This panel is shown by default, thanks to the .show class.