Frontier Airlines flights from Saint Louis (STL) to Denver (DEN).

FLIGHT SCHEDULE
Direct Flights:
Sun 12:03 Saint Louis (STL) 1 13:36 Denver (DEN) Frontier Airlines F9 3301 Non-stop Airbus A320neo (32N) 2:33 Effective 2026-02-01 through 2026-02-08
Mon 13:40 Saint Louis (STL) 1 15:16 Denver (DEN) Frontier Airlines F9 3301 Non-stop Airbus A320neo (32N) 2:36 Effective 2026-01-26 through 2026-02-09
Mon 13:54 Saint Louis (STL) 1 15:30 Denver (DEN) Frontier Airlines F9 3301 Non-stop Airbus A320 (320) 2:36 Effective 2026-02-16 through 2026-03-02
Fri 13:59 Saint Louis (STL) 1 15:35 Denver (DEN) Frontier Airlines F9 3301 Non-stop Airbus A320neo (32N) 2:36 Effective 2026-02-13 through 2026-02-27
Sat 14:51 Saint Louis (STL) 1 16:18 Denver (DEN) Frontier Airlines F9 3301 Non-stop Airbus A320neo (32N) 2:27 Effective 2026-02-14 through 2026-02-28
Wed 15:43 Saint Louis (STL) 1 17:20 Denver (DEN) Frontier Airlines F9 3301 Non-stop Airbus A320neo (32N) 2:37 Operates only on 2026-01-14
Sat 15:43 Saint Louis (STL) 1 17:20 Denver (DEN) Frontier Airlines F9 3301 Non-stop Airbus A321neo (32Q) 2:37 Operates only on 2026-01-17
Wed,Sat 15:46 Saint Louis (STL) 1 17:23 Denver (DEN) Frontier Airlines F9 3301 Non-stop Airbus A320neo (32N) 2:37 Effective 2026-01-21 through 2026-02-07
Wed 16:51 Saint Louis (STL) 1 18:25 Denver (DEN) Frontier Airlines F9 4567 Non-stop Airbus A320neo (32N) 2:34 Effective 2026-02-11 through 2026-03-04
Fri 19:27 Saint Louis (STL) 1 20:59 Denver (DEN) Frontier Airlines F9 4567 Non-stop Airbus A321neo (32Q) 2:32 Operates only on 2026-01-16
Mon 19:36 Saint Louis (STL) 1 21:08 Denver (DEN) Frontier Airlines F9 4567 Non-stop Airbus A320neo (32N) 2:32 Operates only on 2026-01-19
Fri 19:39 Saint Louis (STL) 1 21:11 Denver (DEN) Frontier Airlines F9 4567 Non-stop Airbus A321neo (32Q) 2:32 Effective 2026-01-23 through 2026-02-06
Fri 19:43 Saint Louis (STL) 1 21:15 Denver (DEN) Frontier Airlines F9 4567 Non-stop Airbus A320neo (32N) 2:32 Valid until 2026-01-02
Mon,Wed,Sat 19:43 Saint Louis (STL) 1 21:15 Denver (DEN) Frontier Airlines F9 4567 Non-stop Airbus A321neo (32Q) 2:32 Valid until 2026-01-05
Mon,Wed,Fri,Sat 19:43 Saint Louis (STL) 1 21:15 Denver (DEN) Frontier Airlines F9 4567 Non-stop Airbus A320neo (32N) 2:32 Effective 2026-01-07 through 2026-01-12
Mon,Thu,Fri,Sun 19:43 Saint Louis (STL) 1 21:15 Denver (DEN) Frontier Airlines F9 4567 Non-stop Airbus A321neo (32Q) 2:32 Effective 2026-04-02 through 2026-04-13
Mon,Wed,Fri,Sat 20:12 Saint Louis (STL) 1 21:49 Denver (DEN) Frontier Airlines F9 4567 Non-stop Airbus A321neo (32Q) 2:37 Effective 2026-03-06 through 2026-03-30

A domestic route departing from the Saint Louis airport (STL) and arriving at Denver airport (DEN).
The flight distance is 767 miles, or 1235 km.
The timezone of the departure airport is UTC-6 , and the timezone of the arrival airport is UTC-7 . Current time at the point of departure is (loading...), and (loading...) at the point of arrival. There is a (loading...) hour time difference between the airports.
For direct flights, the flight time varies between 2:27 and 2:37.

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FLIGHT SCHEDULE

Direct Flights:

Frontier Airlines F93301

12:03

Saint Louis (STL) 1

13:36

Denver (DEN)

Effective 2026-02-01 through 2026-02-08

Mon
-

Tue
-

Wed
-

Thu
-

Fri
-

Sat
-

Sun

Duration: 2:33, non-stop
Airbus A320neo (32N)

Direct Flights:

Frontier Airlines F93301

13:40

Saint Louis (STL) 1

15:16

Denver (DEN)

Effective 2026-01-26 through 2026-02-09

Mon

Tue
-

Wed
-

Thu
-

Fri
-

Sat
-

Sun
-

Duration: 2:36, non-stop
Airbus A320neo (32N)

Direct Flights:

Frontier Airlines F93301

13:54

Saint Louis (STL) 1

15:30

Denver (DEN)

Effective 2026-02-16 through 2026-03-02

Mon

Tue
-

Wed
-

Thu
-

Fri
-

Sat
-

Sun
-

Duration: 2:36, non-stop
Airbus A320 (320)

Direct Flights:

Frontier Airlines F93301

13:59

Saint Louis (STL) 1

15:35

Denver (DEN)

Effective 2026-02-13 through 2026-02-27

Mon
-

Tue
-

Wed
-

Thu
-

Fri

Sat
-

Sun
-

Duration: 2:36, non-stop
Airbus A320neo (32N)

Direct Flights:

Frontier Airlines F93301

14:51

Saint Louis (STL) 1

16:18

Denver (DEN)

Effective 2026-02-14 through 2026-02-28

Mon
-

Tue
-

Wed
-

Thu
-

Fri
-

Sat

Sun
-

Duration: 2:27, non-stop
Airbus A320neo (32N)

Direct Flights:

Frontier Airlines F93301

15:43

Saint Louis (STL) 1

17:20

Denver (DEN)

Operates only on 2026-01-14

Mon
-

Tue
-

Wed

Thu
-

Fri
-

Sat
-

Sun
-

Duration: 2:37, non-stop
Airbus A320neo (32N)

Direct Flights:

Frontier Airlines F93301

15:43

Saint Louis (STL) 1

17:20

Denver (DEN)

Operates only on 2026-01-17

Mon
-

Tue
-

Wed
-

Thu
-

Fri
-

Sat

Sun
-

Duration: 2:37, non-stop
Airbus A321neo (32Q)

Direct Flights:

Frontier Airlines F93301

15:46

Saint Louis (STL) 1

17:23

Denver (DEN)

Effective 2026-01-21 through 2026-02-07

Mon
-

Tue
-

Wed

Thu
-

Fri
-

Sat

Sun
-

Duration: 2:37, non-stop
Airbus A320neo (32N)

Direct Flights:

Frontier Airlines F94567

16:51

Saint Louis (STL) 1

18:25

Denver (DEN)

Effective 2026-02-11 through 2026-03-04

Mon
-

Tue
-

Wed

Thu
-

Fri
-

Sat
-

Sun
-

Duration: 2:34, non-stop
Airbus A320neo (32N)

Direct Flights:

Frontier Airlines F94567

19:27

Saint Louis (STL) 1

20:59

Denver (DEN)

Operates only on 2026-01-16

Mon
-

Tue
-

Wed
-

Thu
-

Fri

Sat
-

Sun
-

Duration: 2:32, non-stop
Airbus A321neo (32Q)

Direct Flights:

Frontier Airlines F94567

19:36

Saint Louis (STL) 1

21:08

Denver (DEN)

Operates only on 2026-01-19

Mon

Tue
-

Wed
-

Thu
-

Fri
-

Sat
-

Sun
-

Duration: 2:32, non-stop
Airbus A320neo (32N)

Direct Flights:

Frontier Airlines F94567

19:39

Saint Louis (STL) 1

21:11

Denver (DEN)

Effective 2026-01-23 through 2026-02-06

Mon
-

Tue
-

Wed
-

Thu
-

Fri

Sat
-

Sun
-

Duration: 2:32, non-stop
Airbus A321neo (32Q)

Direct Flights:

Frontier Airlines F94567

19:43

Saint Louis (STL) 1

21:15

Denver (DEN)

Valid until 2026-01-02

Mon
-

Tue
-

Wed
-

Thu
-

Fri

Sat
-

Sun
-

Duration: 2:32, non-stop
Airbus A320neo (32N)

Direct Flights:

Frontier Airlines F94567

19:43

Saint Louis (STL) 1

21:15

Denver (DEN)

Valid until 2026-01-05

Mon

Tue
-

Wed

Thu
-

Fri
-

Sat

Sun
-

Duration: 2:32, non-stop
Airbus A321neo (32Q)

Direct Flights:

Frontier Airlines F94567

19:43

Saint Louis (STL) 1

21:15

Denver (DEN)

Effective 2026-01-07 through 2026-01-12

Mon

Tue
-

Wed

Thu
-

Fri

Sat

Sun
-

Duration: 2:32, non-stop
Airbus A320neo (32N)

Direct Flights:

Frontier Airlines F94567

19:43

Saint Louis (STL) 1

21:15

Denver (DEN)

Effective 2026-04-02 through 2026-04-13

Mon

Tue
-

Wed
-

Thu

Fri

Sat
-

Sun

Duration: 2:32, non-stop
Airbus A321neo (32Q)

Direct Flights:

Frontier Airlines F94567

20:12

Saint Louis (STL) 1

21:49

Denver (DEN)

Effective 2026-03-06 through 2026-03-30

Mon

Tue
-

Wed

Thu
-

Fri

Sat

Sun
-

Duration: 2:37, non-stop
Airbus A321neo (32Q)

A domestic route departing from the Saint Louis airport (STL) and arriving at Denver airport (DEN).
The flight distance is 767 miles, or 1235 km.
The timezone of the departure airport is UTC-6 , and the timezone of the arrival airport is UTC-7 . Current time at the point of departure is (loading...), and (loading...) at the point of arrival. There is a (loading...) hour time difference between the airports.
For direct flights, the flight time varies between 2:27 and 2:37.

All STL-DEN flights

All Frontier Airlines flights

Return (DEN-STL) flights

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