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

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FLIGHT SCHEDULE
Direct Flights:
Mon,Wed-Sun 14:50 Saint Louis (STL) 1 16:26 Denver (DEN) United Airlines UA 333 Non-stop Airbus A319 (319) 2:36 Effective 2026-03-05 through 2026-03-28
Tue 16:30 Saint Louis (STL) 1 18:06 Denver (DEN) United Airlines UA 333 Non-stop Airbus A319 (319) 2:36 Effective 2026-03-10 through 2026-03-24
Daily 05:20 Saint Louis (STL) 1 06:40 Denver (DEN) United Airlines UA 362 Non-stop Airbus A319 (319) 2:20 Effective 2026-05-21 through 2026-10-24
Wed-Fri,Sun 18:00 Saint Louis (STL) 1 19:38 Denver (DEN) United Airlines UA 551 Non-stop Boeing 737-800 (738) 2:38 Effective 2026-01-07 through 2026-01-18
Mon,Wed-Fri,Sun 18:00 Saint Louis (STL) 1 19:38 Denver (DEN) United Airlines UA 551 Non-stop Boeing 737-800 (738) 2:38 Effective 2026-01-19 through 2026-01-25
Wed-Fri,Sun 18:00 Saint Louis (STL) 1 19:38 Denver (DEN) United Airlines UA 551 Non-stop Boeing 737-800 (738) 2:38 Effective 2026-01-28 through 2026-02-11
Mon,Wed,Sun 17:55 Saint Louis (STL) 1 19:30 Denver (DEN) United Airlines UA 725 Non-stop Boeing 737-900 (739) 2:35 Effective 2026-03-08 through 2026-03-25
Thu 18:02 Saint Louis (STL) 1 19:37 Denver (DEN) United Airlines UA 725 Non-stop Boeing 737-900 (739) 2:35 Effective 2026-03-05 through 2026-03-26
Fri 18:05 Saint Louis (STL) 1 19:40 Denver (DEN) United Airlines UA 725 Non-stop Boeing 737-900 (739) 2:35 Effective 2026-03-06 through 2026-03-27
Wed-Fri,Sun 14:45 Saint Louis (STL) 1 16:24 Denver (DEN) United Airlines UA 1229 Non-stop Airbus A319 (319) 2:39 Effective 2026-01-07 through 2026-01-18
Mon,Wed-Fri,Sun 14:45 Saint Louis (STL) 1 16:24 Denver (DEN) United Airlines UA 1229 Non-stop Airbus A319 (319) 2:39 Effective 2026-01-19 through 2026-01-25
Wed-Fri,Sun 14:45 Saint Louis (STL) 1 16:24 Denver (DEN) United Airlines UA 1229 Non-stop Airbus A319 (319) 2:39 Effective 2026-01-28 through 2026-02-11
Mon,Tue,Sat 16:15 Saint Louis (STL) 1 17:53 Denver (DEN) United Airlines UA 1229 Non-stop Boeing 737-800 (738) 2:38 Effective 2026-01-06 through 2026-01-17
Mon,Tue,Sat 16:15 Saint Louis (STL) 1 17:53 Denver (DEN) United Airlines UA 1229 Non-stop Boeing 737-800 (738) 2:38 Effective 2026-01-20 through 2026-02-10
Sat 16:30 Saint Louis (STL) 1 18:04 Denver (DEN) United Airlines UA 1236 Non-stop Boeing 737-800 (738) 2:34 Effective 2026-02-14 through 2026-02-28
Mon,Tue 16:30 Saint Louis (STL) 1 18:05 Denver (DEN) United Airlines UA 1236 Non-stop Airbus A319 (319) 2:35 Effective 2026-02-17 through 2026-03-03
Daily 16:30 Saint Louis (STL) 1 17:50 Denver (DEN) United Airlines UA 1236 Non-stop Airbus A319 (319) 2:20 Effective from 2026-09-24
Mon,Wed,Thu 18:00 Saint Louis (STL) 1 19:34 Denver (DEN) United Airlines UA 1236 Non-stop Boeing 737-800 (738) 2:34 Effective 2026-02-12 through 2026-02-19
Fri,Sun 18:00 Saint Louis (STL) 1 19:35 Denver (DEN) United Airlines UA 1236 Non-stop Airbus A319 (319) 2:35 Effective 2026-02-13 through 2026-02-15
Fri 18:00 Saint Louis (STL) 1 19:34 Denver (DEN) United Airlines UA 1236 Non-stop Boeing 737 MAX 8 (7M8) 2:34 Effective 2026-02-20 through 2026-02-27
Sun 18:00 Saint Louis (STL) 1 19:35 Denver (DEN) United Airlines UA 1236 Non-stop Airbus A319 (319) 2:35 Effective 2026-02-22 through 2026-03-01
Wed,Thu 18:00 Saint Louis (STL) 1 19:34 Denver (DEN) United Airlines UA 1236 Non-stop Boeing 737-800 (738) 2:34 Effective 2026-02-25 through 2026-03-04
Daily 18:02 Saint Louis (STL) 1 19:36 Denver (DEN) United Airlines UA 1236 Non-stop Airbus A319 (319) 2:34 Effective 2026-03-29 through 2026-04-29
Daily 13:30 Saint Louis (STL) 1 15:00 Denver (DEN) United Airlines UA 1380 Non-stop Airbus A320 (320) 2:30 Effective from 2026-05-21
Daily 14:33 Saint Louis (STL) 1 16:06 Denver (DEN) United Airlines UA 1380 Non-stop Boeing 737 MAX 8 (7M8) 2:33 Effective 2026-04-30 through 2026-05-20
Daily 14:45 Saint Louis (STL) 1 16:21 Denver (DEN) United Airlines UA 1380 Non-stop Boeing 737-800 (738) 2:36 Valid until 2026-01-05
Mon,Wed-Fri,Sun 14:45 Saint Louis (STL) 1 16:21 Denver (DEN) United Airlines UA 1380 Non-stop Airbus A319 (319) 2:36 Effective 2026-02-12 through 2026-02-22
Wed-Fri,Sun 14:45 Saint Louis (STL) 1 16:21 Denver (DEN) United Airlines UA 1380 Non-stop Airbus A319 (319) 2:36 Effective 2026-02-25 through 2026-03-04
Daily 14:50 Saint Louis (STL) 1 16:24 Denver (DEN) United Airlines UA 1380 Non-stop Airbus A319 (319) 2:34 Effective 2026-03-29 through 2026-04-29
Daily 08:41 Saint Louis (STL) 1 10:16 Denver (DEN) United Airlines UA 1396 Non-stop Boeing 737-800 (738) 2:35 Effective 2026-02-12 through 2026-03-04
Daily 08:45 Saint Louis (STL) 1 10:21 Denver (DEN) United Airlines UA 1396 Non-stop Boeing 737-800 (738) 2:36 Effective 2026-01-06 through 2026-02-11
Daily 09:00 Saint Louis (STL) 1 10:35 Denver (DEN) United Airlines UA 1396 Non-stop Boeing 737-800 (738) 2:35 Valid until 2026-01-04
Mon 09:00 Saint Louis (STL) 1 10:32 Denver (DEN) United Airlines UA 1396 Non-stop Airbus A320 (320) 2:32 Operates only on 2026-01-05
Daily 09:00 Saint Louis (STL) 1 10:35 Denver (DEN) United Airlines UA 1396 Non-stop Boeing 737-900 (739) 2:35 Effective 2026-03-05 through 2026-03-28
Daily 08:54 Saint Louis (STL) 1 10:28 Denver (DEN) United Airlines UA 1415 Non-stop Airbus A319 (319) 2:34 Effective 2026-04-30 through 2026-05-20
Daily 09:00 Saint Louis (STL) 1 10:34 Denver (DEN) United Airlines UA 1415 Non-stop Airbus A320 (320) 2:34 Effective 2026-03-29 through 2026-04-29
Daily 09:13 Saint Louis (STL) 1 10:35 Denver (DEN) United Airlines UA 1415 Non-stop Airbus A320 (320) 2:22 Effective from 2026-05-21
Daily 16:30 Saint Louis (STL) 1 17:50 Denver (DEN) United Airlines UA 2651 Non-stop Airbus A319 (319) 2:20 Effective 2026-05-21 through 2026-09-23
Daily 18:00 Saint Louis (STL) 1 19:33 Denver (DEN) United Airlines UA 2651 Non-stop Boeing 737-800 (738) 2:33 Effective 2026-04-30 through 2026-05-20
Daily 05:30 Saint Louis (STL) 1 07:10 Denver (DEN) United Airlines UA 5620 Non-stop Embraer EMB 175 (E7W) 2:40 Effective 2026-03-05 through 2026-03-28

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Parallax here STL-DEN

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 2:20 and 2:40.

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

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FLIGHT SCHEDULE

Direct Flights:

United Airlines UA333

14:50

Saint Louis (STL) 1

16:26

Denver (DEN)

Effective 2026-03-05 through 2026-03-28

Mon

Tue
-

Wed

Thu

Fri

Sat

Sun

Duration: 2:36, non-stop
Airbus A319 (319)

Direct Flights:

United Airlines UA333

16:30

Saint Louis (STL) 1

18:06

Denver (DEN)

Effective 2026-03-10 through 2026-03-24

Mon
-

Tue

Wed
-

Thu
-

Fri
-

Sat
-

Sun
-

Duration: 2:36, non-stop
Airbus A319 (319)

Direct Flights:

United Airlines UA362

05:20

Saint Louis (STL) 1

06:40

Denver (DEN)

Effective 2026-05-21 through 2026-10-24

Mon

Tue

Wed

Thu

Fri

Sat

Sun

Duration: 2:20, non-stop
Airbus A319 (319)

Direct Flights:

United Airlines UA551

18:00

Saint Louis (STL) 1

19:38

Denver (DEN)

Effective 2026-01-07 through 2026-01-18

Mon
-

Tue
-

Wed

Thu

Fri

Sat
-

Sun

Duration: 2:38, non-stop
Boeing 737-800 (738)

Direct Flights:

United Airlines UA551

18:00

Saint Louis (STL) 1

19:38

Denver (DEN)

Effective 2026-01-19 through 2026-01-25

Mon

Tue
-

Wed

Thu

Fri

Sat
-

Sun

Duration: 2:38, non-stop
Boeing 737-800 (738)

Direct Flights:

United Airlines UA551

18:00

Saint Louis (STL) 1

19:38

Denver (DEN)

Effective 2026-01-28 through 2026-02-11

Mon
-

Tue
-

Wed

Thu

Fri

Sat
-

Sun

Duration: 2:38, non-stop
Boeing 737-800 (738)

Direct Flights:

United Airlines UA725

17:55

Saint Louis (STL) 1

19:30

Denver (DEN)

Effective 2026-03-08 through 2026-03-25

Mon

Tue
-

Wed

Thu
-

Fri
-

Sat
-

Sun

Duration: 2:35, non-stop
Boeing 737-900 (739)

Direct Flights:

United Airlines UA725

18:02

Saint Louis (STL) 1

19:37

Denver (DEN)

Effective 2026-03-05 through 2026-03-26

Mon
-

Tue
-

Wed
-

Thu

Fri
-

Sat
-

Sun
-

Duration: 2:35, non-stop
Boeing 737-900 (739)

Direct Flights:

United Airlines UA725

18:05

Saint Louis (STL) 1

19:40

Denver (DEN)

Effective 2026-03-06 through 2026-03-27

Mon
-

Tue
-

Wed
-

Thu
-

Fri

Sat
-

Sun
-

Duration: 2:35, non-stop
Boeing 737-900 (739)

Direct Flights:

United Airlines UA1229

14:45

Saint Louis (STL) 1

16:24

Denver (DEN)

Effective 2026-01-07 through 2026-01-18

Mon
-

Tue
-

Wed

Thu

Fri

Sat
-

Sun

Duration: 2:39, non-stop
Airbus A319 (319)

Direct Flights:

United Airlines UA1229

14:45

Saint Louis (STL) 1

16:24

Denver (DEN)

Effective 2026-01-19 through 2026-01-25

Mon

Tue
-

Wed

Thu

Fri

Sat
-

Sun

Duration: 2:39, non-stop
Airbus A319 (319)

Direct Flights:

United Airlines UA1229

14:45

Saint Louis (STL) 1

16:24

Denver (DEN)

Effective 2026-01-28 through 2026-02-11

Mon
-

Tue
-

Wed

Thu

Fri

Sat
-

Sun

Duration: 2:39, non-stop
Airbus A319 (319)

Direct Flights:

United Airlines UA1229

16:15

Saint Louis (STL) 1

17:53

Denver (DEN)

Effective 2026-01-06 through 2026-01-17

Mon

Tue

Wed
-

Thu
-

Fri
-

Sat

Sun
-

Duration: 2:38, non-stop
Boeing 737-800 (738)

Direct Flights:

United Airlines UA1229

16:15

Saint Louis (STL) 1

17:53

Denver (DEN)

Effective 2026-01-20 through 2026-02-10

Mon

Tue

Wed
-

Thu
-

Fri
-

Sat

Sun
-

Duration: 2:38, non-stop
Boeing 737-800 (738)

Direct Flights:

United Airlines UA1236

16:30

Saint Louis (STL) 1

18:04

Denver (DEN)

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

Mon
-

Tue
-

Wed
-

Thu
-

Fri
-

Sat

Sun
-

Duration: 2:34, non-stop
Boeing 737-800 (738)

Direct Flights:

United Airlines UA1236

16:30

Saint Louis (STL) 1

18:05

Denver (DEN)

Effective 2026-02-17 through 2026-03-03

Mon

Tue

Wed
-

Thu
-

Fri
-

Sat
-

Sun
-

Duration: 2:35, non-stop
Airbus A319 (319)

Direct Flights:

United Airlines UA1236

16:30

Saint Louis (STL) 1

17:50

Denver (DEN)

Effective from 2026-09-24

Mon

Tue

Wed

Thu

Fri

Sat

Sun

Duration: 2:20, non-stop
Airbus A319 (319)

Direct Flights:

United Airlines UA1236

18:00

Saint Louis (STL) 1

19:34

Denver (DEN)

Effective 2026-02-12 through 2026-02-19

Mon

Tue
-

Wed

Thu

Fri
-

Sat
-

Sun
-

Duration: 2:34, non-stop
Boeing 737-800 (738)

Direct Flights:

United Airlines UA1236

18:00

Saint Louis (STL) 1

19:35

Denver (DEN)

Effective 2026-02-13 through 2026-02-15

Mon
-

Tue
-

Wed
-

Thu
-

Fri

Sat
-

Sun

Duration: 2:35, non-stop
Airbus A319 (319)

Direct Flights:

United Airlines UA1236

18:00

Saint Louis (STL) 1

19:34

Denver (DEN)

Effective 2026-02-20 through 2026-02-27

Mon
-

Tue
-

Wed
-

Thu
-

Fri

Sat
-

Sun
-

Duration: 2:34, non-stop
Boeing 737 MAX 8 (7M8)

Direct Flights:

United Airlines UA1236

18:00

Saint Louis (STL) 1

19:35

Denver (DEN)

Effective 2026-02-22 through 2026-03-01

Mon
-

Tue
-

Wed
-

Thu
-

Fri
-

Sat
-

Sun

Duration: 2:35, non-stop
Airbus A319 (319)

Direct Flights:

United Airlines UA1236

18:00

Saint Louis (STL) 1

19:34

Denver (DEN)

Effective 2026-02-25 through 2026-03-04

Mon
-

Tue
-

Wed

Thu

Fri
-

Sat
-

Sun
-

Duration: 2:34, non-stop
Boeing 737-800 (738)

Direct Flights:

United Airlines UA1236

18:02

Saint Louis (STL) 1

19:36

Denver (DEN)

Effective 2026-03-29 through 2026-04-29

Mon

Tue

Wed

Thu

Fri

Sat

Sun

Duration: 2:34, non-stop
Airbus A319 (319)

Direct Flights:

United Airlines UA1380

13:30

Saint Louis (STL) 1

15:00

Denver (DEN)

Effective from 2026-05-21

Mon

Tue

Wed

Thu

Fri

Sat

Sun

Duration: 2:30, non-stop
Airbus A320 (320)

Direct Flights:

United Airlines UA1380

14:33

Saint Louis (STL) 1

16:06

Denver (DEN)

Effective 2026-04-30 through 2026-05-20

Mon

Tue

Wed

Thu

Fri

Sat

Sun

Duration: 2:33, non-stop
Boeing 737 MAX 8 (7M8)

Direct Flights:

United Airlines UA1380

14:45

Saint Louis (STL) 1

16:21

Denver (DEN)

Valid until 2026-01-05

Mon

Tue

Wed

Thu

Fri

Sat

Sun

Duration: 2:36, non-stop
Boeing 737-800 (738)

Direct Flights:

United Airlines UA1380

14:45

Saint Louis (STL) 1

16:21

Denver (DEN)

Effective 2026-02-12 through 2026-02-22

Mon

Tue
-

Wed

Thu

Fri

Sat
-

Sun

Duration: 2:36, non-stop
Airbus A319 (319)

Direct Flights:

United Airlines UA1380

14:45

Saint Louis (STL) 1

16:21

Denver (DEN)

Effective 2026-02-25 through 2026-03-04

Mon
-

Tue
-

Wed

Thu

Fri

Sat
-

Sun

Duration: 2:36, non-stop
Airbus A319 (319)

Direct Flights:

United Airlines UA1380

14:50

Saint Louis (STL) 1

16:24

Denver (DEN)

Effective 2026-03-29 through 2026-04-29

Mon

Tue

Wed

Thu

Fri

Sat

Sun

Duration: 2:34, non-stop
Airbus A319 (319)

Direct Flights:

United Airlines UA1396

08:41

Saint Louis (STL) 1

10:16

Denver (DEN)

Effective 2026-02-12 through 2026-03-04

Mon

Tue

Wed

Thu

Fri

Sat

Sun

Duration: 2:35, non-stop
Boeing 737-800 (738)

Direct Flights:

United Airlines UA1396

08:45

Saint Louis (STL) 1

10:21

Denver (DEN)

Effective 2026-01-06 through 2026-02-11

Mon

Tue

Wed

Thu

Fri

Sat

Sun

Duration: 2:36, non-stop
Boeing 737-800 (738)

Direct Flights:

United Airlines UA1396

09:00

Saint Louis (STL) 1

10:35

Denver (DEN)

Valid until 2026-01-04

Mon

Tue

Wed

Thu

Fri

Sat

Sun

Duration: 2:35, non-stop
Boeing 737-800 (738)

Direct Flights:

United Airlines UA1396

09:00

Saint Louis (STL) 1

10:32

Denver (DEN)

Operates only on 2026-01-05

Mon

Tue
-

Wed
-

Thu
-

Fri
-

Sat
-

Sun
-

Duration: 2:32, non-stop
Airbus A320 (320)

Direct Flights:

United Airlines UA1396

09:00

Saint Louis (STL) 1

10:35

Denver (DEN)

Effective 2026-03-05 through 2026-03-28

Mon

Tue

Wed

Thu

Fri

Sat

Sun

Duration: 2:35, non-stop
Boeing 737-900 (739)

Direct Flights:

United Airlines UA1415

08:54

Saint Louis (STL) 1

10:28

Denver (DEN)

Effective 2026-04-30 through 2026-05-20

Mon

Tue

Wed

Thu

Fri

Sat

Sun

Duration: 2:34, non-stop
Airbus A319 (319)

Direct Flights:

United Airlines UA1415

09:00

Saint Louis (STL) 1

10:34

Denver (DEN)

Effective 2026-03-29 through 2026-04-29

Mon

Tue

Wed

Thu

Fri

Sat

Sun

Duration: 2:34, non-stop
Airbus A320 (320)

Direct Flights:

United Airlines UA1415

09:13

Saint Louis (STL) 1

10:35

Denver (DEN)

Effective from 2026-05-21

Mon

Tue

Wed

Thu

Fri

Sat

Sun

Duration: 2:22, non-stop
Airbus A320 (320)

Direct Flights:

United Airlines UA2651

16:30

Saint Louis (STL) 1

17:50

Denver (DEN)

Effective 2026-05-21 through 2026-09-23

Mon

Tue

Wed

Thu

Fri

Sat

Sun

Duration: 2:20, non-stop
Airbus A319 (319)

Direct Flights:

United Airlines UA2651

18:00

Saint Louis (STL) 1

19:33

Denver (DEN)

Effective 2026-04-30 through 2026-05-20

Mon

Tue

Wed

Thu

Fri

Sat

Sun

Duration: 2:33, non-stop
Boeing 737-800 (738)

Direct Flights:

United Airlines UA5620

05:30

Saint Louis (STL) 1

07:10

Denver (DEN)

Effective 2026-03-05 through 2026-03-28

Mon

Tue

Wed

Thu

Fri

Sat

Sun

Duration: 2:40, non-stop
Embraer EMB 175 (E7W)

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Parallax here STL-DEN

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 2:20 and 2:40.

All STL-DEN flights

All United Airlines flights

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