United Airlines flight UA 643: Multiple routes

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Select flight date:
FLIGHT SCHEDULE
Direct Flights:
Daily 10:35 San Francisco (SFO) 3 12:11 Santa Ana (SNA)
UA 643 Non-stop Boeing 737 MAX 8 (7M8) 1:36 Effective 2025-09-25 through 2025-10-25
Daily 10:35 San Francisco (SFO) 3 12:13 Santa Ana (SNA)
UA 643 Non-stop Boeing 737-800 (738) 1:38 Effective 2026-01-06 through 2026-02-11
Daily 10:42 San Francisco (SFO) 3 12:18 Santa Ana (SNA)
UA 643 Non-stop Boeing 737 MAX 8 (7M8) 1:36 Effective 2025-08-19 through 2025-09-24
Daily 10:42 San Francisco (SFO) 3 12:17 Santa Ana (SNA)
UA 643 Non-stop Boeing 737-800 (738) 1:35 Effective 2025-10-26 through 2025-12-17
Daily 10:43 San Francisco (SFO) 3 12:21 Santa Ana (SNA)
UA 643 Non-stop Airbus A320 (320) 1:38 Effective 2025-12-18 through 2026-01-05
Daily 10:45 San Francisco (SFO) 3 12:27 Santa Ana (SNA)
UA 643 Non-stop Boeing 737-800 (738) 1:42 Effective from 2026-02-12
Daily 13:00 Santa Ana (SNA) 16:14 Denver (DEN)
UA 643 Non-stop Boeing 737 MAX 8 (7M8) 2:14 Effective 2025-08-19 through 2025-09-24
Mon-Thu,Sat,Sun 13:15 Santa Ana (SNA) 16:33 Denver (DEN)
UA 643 Non-stop Boeing 737 MAX 8 (7M8) 2:18 Effective 2025-06-26 through 2025-07-31
Fri 13:15 Santa Ana (SNA) 16:33 Denver (DEN)
UA 643 Non-stop Boeing 737-800 (738) 2:18 Effective 2025-06-27 through 2025-07-25
Daily 13:15 Santa Ana (SNA) 16:35 Denver (DEN)
UA 643 Non-stop Boeing 737 MAX 8 (7M8) 2:20 Effective 2025-09-25 through 2025-10-25
Daily 13:20 Santa Ana (SNA) 16:34 Denver (DEN)
UA 643 Non-stop Boeing 737-800 (738) 2:14 Effective from 2025-10-26
Daily 17:20 Denver (DEN) 19:47 Wichita (ICT)
UA 643 Non-stop Airbus A320 (320) 1:27 Effective 2025-09-25 through 2025-10-25
Daily 17:30 Denver (DEN) 19:55 Wichita (ICT)
UA 643 Non-stop Airbus A319 (319) 1:25 Valid until 2025-05-21
Daily 17:40 Denver (DEN) 20:12 Wichita (ICT)
UA 643 Non-stop Airbus A320 (320) 1:32 Effective 2025-08-19 through 2025-09-24
Daily 17:43 Denver (DEN) 20:15 Wichita (ICT)
UA 643 Non-stop Airbus A320 (320) 1:32 Effective 2025-05-22 through 2025-06-25
Daily 17:50 Denver (DEN) 20:22 Wichita (ICT)
UA 643 Non-stop Airbus A319 (319) 1:32 Effective 2025-06-26 through 2025-08-18
Daily 18:00 Denver (DEN) 20:32 Wichita (ICT)
UA 643 Non-stop Airbus A319 (319) 1:32 Effective from 2025-10-26
Non-Direct Flights:
Daily 10:35 San Francisco (SFO) 3 16:35 Denver (DEN)
UA 643 1-stop Boeing 737 MAX 8 (7M8) 5:00 Effective 2025-09-25 through 2025-10-25
Daily 10:35 San Francisco (SFO) 3 16:34 Denver (DEN)
UA 643 1-stop Boeing 737-800 (738) 4:59 Effective 2026-01-06 through 2026-02-11
Daily 10:42 San Francisco (SFO) 3 16:14 Denver (DEN)
UA 643 1-stop Boeing 737 MAX 8 (7M8) 4:32 Effective 2025-08-19 through 2025-09-24
Daily 10:42 San Francisco (SFO) 3 16:34 Denver (DEN)
UA 643 1-stop Boeing 737-800 (738) 4:52 Effective 2025-10-26 through 2025-12-17
Daily 10:43 San Francisco (SFO) 3 16:34 Denver (DEN)
UA 643 1-stop Airbus A320 (320) 4:51 Effective 2025-12-18 through 2026-01-05
Daily 10:45 San Francisco (SFO) 3 16:34 Denver (DEN)
UA 643 1-stop Boeing 737-800 (738) 4:49 Effective from 2026-02-12
Daily 13:00 Santa Ana (SNA) 20:12 Wichita (ICT)
UA 643 1-stop Boeing 737 MAX 8 (7M8) 5:12 Effective 2025-08-19 through 2025-09-24
Mon-Thu,Sat,Sun 13:15 Santa Ana (SNA) 20:22 Wichita (ICT)
UA 643 1-stop Boeing 737 MAX 8 (7M8) 5:07 Effective 2025-06-26 through 2025-07-31
Fri 13:15 Santa Ana (SNA) 20:22 Wichita (ICT)
UA 643 1-stop Boeing 737-800 (738) 5:07 Effective 2025-06-27 through 2025-07-25
Daily 13:15 Santa Ana (SNA) 19:47 Wichita (ICT)
UA 643 1-stop Boeing 737 MAX 8 (7M8) 4:32 Effective 2025-09-25 through 2025-10-25
Daily 13:20 Santa Ana (SNA) 20:32 Wichita (ICT)
UA 643 1-stop Boeing 737-800 (738) 5:12 Effective from 2025-10-26
Daily 10:35 San Francisco (SFO) 3 19:47 Wichita (ICT)
UA 643 2-stop Boeing 737 MAX 8 (7M8) 7:12 Effective 2025-09-25 through 2025-10-25
Daily 10:35 San Francisco (SFO) 3 20:32 Wichita (ICT)
UA 643 2-stop Boeing 737-800 (738) 7:57 Effective 2026-01-06 through 2026-02-11
Daily 10:42 San Francisco (SFO) 3 20:12 Wichita (ICT)
UA 643 2-stop Boeing 737 MAX 8 (7M8) 7:30 Effective 2025-08-19 through 2025-09-24
Daily 10:42 San Francisco (SFO) 3 20:32 Wichita (ICT)
UA 643 2-stop Boeing 737-800 (738) 7:50 Effective 2025-10-26 through 2025-12-17
Daily 10:43 San Francisco (SFO) 3 20:32 Wichita (ICT)
UA 643 2-stop Airbus A320 (320) 7:49 Effective 2025-12-18 through 2026-01-05
Daily 10:45 San Francisco (SFO) 3 20:32 Wichita (ICT)
UA 643 2-stop Boeing 737-800 (738) 7:47 Effective from 2026-02-12
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This flight number is listed as serving the following routes:


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United Airlines flight UA 643: Multiple routes
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Select flight date:
FLIGHT SCHEDULE
Direct Flights:
United Airlines UA643
10:35
San Francisco (SFO) 3

12:11
Santa Ana (SNA)
Effective 2025-09-25 through 2025-10-25
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 1:36, non-stop
Boeing 737 MAX 8 (7M8)
United Airlines UA643
10:35
San Francisco (SFO) 3

12:13
Santa Ana (SNA)
Effective 2026-01-06 through 2026-02-11
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 1:38, non-stop
Boeing 737-800 (738)
United Airlines UA643
10:42
San Francisco (SFO) 3

12:18
Santa Ana (SNA)
Effective 2025-08-19 through 2025-09-24
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 1:36, non-stop
Boeing 737 MAX 8 (7M8)
United Airlines UA643
10:42
San Francisco (SFO) 3

12:17
Santa Ana (SNA)
Effective 2025-10-26 through 2025-12-17
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 1:35, non-stop
Boeing 737-800 (738)
United Airlines UA643
10:43
San Francisco (SFO) 3

12:21
Santa Ana (SNA)
Effective 2025-12-18 through 2026-01-05
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 1:38, non-stop
Airbus A320 (320)
United Airlines UA643
10:45
San Francisco (SFO) 3

12:27
Santa Ana (SNA)
Effective from 2026-02-12
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 1:42, non-stop
Boeing 737-800 (738)
United Airlines UA643
13:00
Santa Ana (SNA)

16:14
Denver (DEN)
Effective 2025-08-19 through 2025-09-24
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 2:14, non-stop
Boeing 737 MAX 8 (7M8)
United Airlines UA643
13:15
Santa Ana (SNA)

16:33
Denver (DEN)
Effective 2025-06-26 through 2025-07-31
Mon
Tue
Wed
Thu
Fri
-
Sat
Sun
Duration: 2:18, non-stop
Boeing 737 MAX 8 (7M8)
United Airlines UA643
13:15
Santa Ana (SNA)

16:33
Denver (DEN)
Effective 2025-06-27 through 2025-07-25
Mon
-
Tue
-
Wed
-
Thu
-
Fri
Sat
-
Sun
-
Duration: 2:18, non-stop
Boeing 737-800 (738)
United Airlines UA643
13:15
Santa Ana (SNA)

16:35
Denver (DEN)
Effective 2025-09-25 through 2025-10-25
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 2:20, non-stop
Boeing 737 MAX 8 (7M8)
United Airlines UA643
13:20
Santa Ana (SNA)

16:34
Denver (DEN)
Effective from 2025-10-26
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 2:14, non-stop
Boeing 737-800 (738)
United Airlines UA643
17:20
Denver (DEN)

19:47
Wichita (ICT)
Effective 2025-09-25 through 2025-10-25
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 1:27, non-stop
Airbus A320 (320)
United Airlines UA643
17:30
Denver (DEN)

19:55
Wichita (ICT)
Valid until 2025-05-21
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 1:25, non-stop
Airbus A319 (319)
United Airlines UA643
17:40
Denver (DEN)

20:12
Wichita (ICT)
Effective 2025-08-19 through 2025-09-24
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 1:32, non-stop
Airbus A320 (320)
United Airlines UA643
17:43
Denver (DEN)

20:15
Wichita (ICT)
Effective 2025-05-22 through 2025-06-25
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 1:32, non-stop
Airbus A320 (320)
United Airlines UA643
17:50
Denver (DEN)

20:22
Wichita (ICT)
Effective 2025-06-26 through 2025-08-18
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 1:32, non-stop
Airbus A319 (319)
United Airlines UA643
18:00
Denver (DEN)

20:32
Wichita (ICT)
Effective from 2025-10-26
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 1:32, non-stop
Airbus A319 (319)
Non-Direct Flights:
United Airlines UA643
10:35
San Francisco (SFO) 3

16:35
Denver (DEN)
Effective 2025-09-25 through 2025-10-25
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 5:00, 1-stop
Boeing 737 MAX 8 (7M8)
United Airlines UA643
10:35
San Francisco (SFO) 3

16:34
Denver (DEN)
Effective 2026-01-06 through 2026-02-11
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 4:59, 1-stop
Boeing 737-800 (738)
United Airlines UA643
10:42
San Francisco (SFO) 3

16:14
Denver (DEN)
Effective 2025-08-19 through 2025-09-24
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 4:32, 1-stop
Boeing 737 MAX 8 (7M8)
United Airlines UA643
10:42
San Francisco (SFO) 3

16:34
Denver (DEN)
Effective 2025-10-26 through 2025-12-17
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 4:52, 1-stop
Boeing 737-800 (738)
United Airlines UA643
10:43
San Francisco (SFO) 3

16:34
Denver (DEN)
Effective 2025-12-18 through 2026-01-05
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 4:51, 1-stop
Airbus A320 (320)
United Airlines UA643
10:45
San Francisco (SFO) 3

16:34
Denver (DEN)
Effective from 2026-02-12
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 4:49, 1-stop
Boeing 737-800 (738)
United Airlines UA643
13:00
Santa Ana (SNA)

20:12
Wichita (ICT)
Effective 2025-08-19 through 2025-09-24
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 5:12, 1-stop
Boeing 737 MAX 8 (7M8)
United Airlines UA643
13:15
Santa Ana (SNA)

20:22
Wichita (ICT)
Effective 2025-06-26 through 2025-07-31
Mon
Tue
Wed
Thu
Fri
-
Sat
Sun
Duration: 5:07, 1-stop
Boeing 737 MAX 8 (7M8)
United Airlines UA643
13:15
Santa Ana (SNA)

20:22
Wichita (ICT)
Effective 2025-06-27 through 2025-07-25
Mon
-
Tue
-
Wed
-
Thu
-
Fri
Sat
-
Sun
-
Duration: 5:07, 1-stop
Boeing 737-800 (738)
United Airlines UA643
13:15
Santa Ana (SNA)

19:47
Wichita (ICT)
Effective 2025-09-25 through 2025-10-25
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 4:32, 1-stop
Boeing 737 MAX 8 (7M8)
United Airlines UA643
13:20
Santa Ana (SNA)

20:32
Wichita (ICT)
Effective from 2025-10-26
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 5:12, 1-stop
Boeing 737-800 (738)
United Airlines UA643
10:35
San Francisco (SFO) 3

19:47
Wichita (ICT)
Effective 2025-09-25 through 2025-10-25
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 7:12, 2-stop
Boeing 737 MAX 8 (7M8)
United Airlines UA643
10:35
San Francisco (SFO) 3

20:32
Wichita (ICT)
Effective 2026-01-06 through 2026-02-11
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 7:57, 2-stop
Boeing 737-800 (738)
United Airlines UA643
10:42
San Francisco (SFO) 3

20:12
Wichita (ICT)
Effective 2025-08-19 through 2025-09-24
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 7:30, 2-stop
Boeing 737 MAX 8 (7M8)
United Airlines UA643
10:42
San Francisco (SFO) 3

20:32
Wichita (ICT)
Effective 2025-10-26 through 2025-12-17
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 7:50, 2-stop
Boeing 737-800 (738)
United Airlines UA643
10:43
San Francisco (SFO) 3

20:32
Wichita (ICT)
Effective 2025-12-18 through 2026-01-05
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 7:49, 2-stop
Airbus A320 (320)
United Airlines UA643
10:45
San Francisco (SFO) 3

20:32
Wichita (ICT)
Effective from 2026-02-12
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 7:47, 2-stop
Boeing 737-800 (738)
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Parallax here -
This flight number is listed as serving the following routes:
  • Denver (DEN) - Wichita (ICT)
  • San Francisco (SFO) - Denver (DEN)
  • San Francisco (SFO) - Santa Ana (SNA)
  • San Francisco (SFO) - Wichita (ICT)
  • Santa Ana (SNA) - Denver (DEN)
  • Santa Ana (SNA) - Wichita (ICT)
All United Airlines flights
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