United Airlines flight UA 421: Multiple routes

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Select flight date:
FLIGHT SCHEDULE
Direct Flights:
Daily 11:05 Santa Ana (SNA) 14:28 Denver (DEN)
UA 421 Non-stop Boeing 737 MAX 8 (7M8) 2:23 Effective 2026-01-06 through 2026-02-11
Daily 11:10 Santa Ana (SNA) 14:29 Denver (DEN)
UA 421 Non-stop Boeing 737 MAX 8 (7M8) 2:19 Effective 2026-02-12 through 2026-03-04
Daily 11:10 Santa Ana (SNA) 14:34 Denver (DEN)
UA 421 Non-stop Airbus A320 (320) 2:24 Effective 2026-04-30 through 2026-05-20
Daily 11:15 Santa Ana (SNA) 14:34 Denver (DEN)
UA 421 Non-stop Boeing 737 MAX 8 (7M8) 2:19 Effective 2026-03-05 through 2026-03-28
Daily 11:15 Santa Ana (SNA) 14:39 Denver (DEN)
UA 421 Non-stop Airbus A319 (319) 2:24 Effective 2026-03-29 through 2026-04-29
Daily 11:30 Santa Ana (SNA) 14:40 Denver (DEN)
UA 421 Non-stop Boeing 737 MAX 8 (7M8) 2:10 Effective from 2026-05-21
Daily 16:25 Salt Lake City (SLC) 17:57 Denver (DEN)
UA 421 Non-stop Boeing 737-800 (738) 1:32 Valid until 2026-01-05
Mon,Wed,Fri-Sun 18:49 Denver (DEN) 22:15 Milwaukee (MKE)
UA 421 Non-stop Airbus A319 (319) 2:26 Valid until 2026-01-05
Thu 18:49 Denver (DEN) 22:15 Milwaukee (MKE)
UA 421 Non-stop Airbus A320 (320) 2:26 Operates only on 2026-01-01
Non-Direct Flights:
Daily 16:25 Salt Lake City (SLC) 22:15 Milwaukee (MKE)
UA 421 1-stop Boeing 737-800 (738) 4:50 Valid until 2026-01-05
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This flight number is listed as serving the following routes:


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United Airlines flight UA 421: Multiple routes
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Select flight date:
FLIGHT SCHEDULE
Direct Flights:
United Airlines UA421
11:05
Santa Ana (SNA)

14:28
Denver (DEN)
Effective 2026-01-06 through 2026-02-11
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 2:23, non-stop
Boeing 737 MAX 8 (7M8)
Direct Flights:
United Airlines UA421
11:10
Santa Ana (SNA)

14:29
Denver (DEN)
Effective 2026-02-12 through 2026-03-04
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 2:19, non-stop
Boeing 737 MAX 8 (7M8)
Direct Flights:
United Airlines UA421
11:10
Santa Ana (SNA)

14:34
Denver (DEN)
Effective 2026-04-30 through 2026-05-20
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 2:24, non-stop
Airbus A320 (320)
Direct Flights:
United Airlines UA421
11:15
Santa Ana (SNA)

14:34
Denver (DEN)
Effective 2026-03-05 through 2026-03-28
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 2:19, non-stop
Boeing 737 MAX 8 (7M8)
Direct Flights:
United Airlines UA421
11:15
Santa Ana (SNA)

14:39
Denver (DEN)
Effective 2026-03-29 through 2026-04-29
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 2:24, non-stop
Airbus A319 (319)
Direct Flights:
United Airlines UA421
11:30
Santa Ana (SNA)

14:40
Denver (DEN)
Effective from 2026-05-21
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 2:10, non-stop
Boeing 737 MAX 8 (7M8)
Direct Flights:
United Airlines UA421
16:25
Salt Lake City (SLC)

17:57
Denver (DEN)
Valid until 2026-01-05
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 1:32, non-stop
Boeing 737-800 (738)
Direct Flights:
United Airlines UA421
18:49
Denver (DEN)

22:15
Milwaukee (MKE)
Valid until 2026-01-05
Mon
Tue
-
Wed
Thu
-
Fri
Sat
Sun
Duration: 2:26, non-stop
Airbus A319 (319)
Direct Flights:
United Airlines UA421
18:49
Denver (DEN)

22:15
Milwaukee (MKE)
Operates only on 2026-01-01
Mon
-
Tue
-
Wed
-
Thu
Fri
-
Sat
-
Sun
-
Duration: 2:26, non-stop
Airbus A320 (320)
Non-Direct Flights:
United Airlines UA421
16:25
Salt Lake City (SLC)

22:15
Milwaukee (MKE)
Valid until 2026-01-05
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 4:50, 1-stop
Boeing 737-800 (738)
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This flight number is listed as serving the following routes:
  • Denver (DEN) - Milwaukee (MKE)
  • Salt Lake City (SLC) - Denver (DEN)
  • Salt Lake City (SLC) - Milwaukee (MKE)
  • Santa Ana (SNA) - Denver (DEN)
All United Airlines flights
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