United Airlines flight UA 2666: Multiple routes

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Select flight date:
FLIGHT SCHEDULE
Direct Flights:
Daily 05:15 Chicago O'Hare (ORD) 1 06:52 Denver (DEN)
UA 2666 Non-stop Boeing 737-900 (739) 2:37 Effective from 2026-05-21
Daily 07:50 Denver (DEN) 09:15 Santa Ana (SNA)
UA 2666 Non-stop Boeing 737 MAX 8 (7M8) 2:25 Effective from 2026-05-21
Daily 08:00 Denver (DEN) 09:36 Santa Ana (SNA)
UA 2666 Non-stop Boeing 737 MAX 8 (7M8) 2:36 Effective 2026-01-06 through 2026-02-11
Daily 08:01 Denver (DEN) 09:38 Santa Ana (SNA)
UA 2666 Non-stop Airbus A320 (320) 2:37 Valid until 2026-01-05
Daily 08:05 Denver (DEN) 09:45 Santa Ana (SNA)
UA 2666 Non-stop Boeing 737 MAX 8 (7M8) 2:40 Effective 2026-02-12 through 2026-03-04
Daily 08:08 Denver (DEN) 09:48 Santa Ana (SNA)
UA 2666 Non-stop Boeing 737 MAX 8 (7M8) 2:40 Effective 2026-03-05 through 2026-03-28
Daily 08:08 Denver (DEN) 09:42 Santa Ana (SNA)
UA 2666 Non-stop Airbus A319 (319) 2:34 Effective 2026-03-29 through 2026-04-29
Daily 08:10 Denver (DEN) 09:44 Santa Ana (SNA)
UA 2666 Non-stop Airbus A320 (320) 2:34 Effective 2026-04-30 through 2026-05-20
Daily 11:00 Santa Ana (SNA) 12:40 San Francisco (SFO) 3
UA 2666 Non-stop Airbus A320 (320) 1:40 Effective from 2026-05-21
Non-Direct Flights:
Daily 05:15 Chicago O'Hare (ORD) 1 09:15 Santa Ana (SNA)
UA 2666 1-stop Boeing 737-900 (739) 6:00 Effective from 2026-05-21
Daily 07:50 Denver (DEN) 12:40 San Francisco (SFO) 3
UA 2666 1-stop Boeing 737 MAX 8 (7M8) 5:50 Effective from 2026-05-21
Daily 05:15 Chicago O'Hare (ORD) 1 12:40 San Francisco (SFO) 3
UA 2666 2-stop Boeing 737-900 (739) 9:25 Effective from 2026-05-21
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This flight number is listed as serving the following routes:


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United Airlines flight UA 2666: Multiple routes
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Select flight date:
FLIGHT SCHEDULE
Direct Flights:
United Airlines UA2666
05:15
Chicago O'Hare (ORD) 1

06:52
Denver (DEN)
Effective from 2026-05-21
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 2:37, non-stop
Boeing 737-900 (739)
Direct Flights:
United Airlines UA2666
07:50
Denver (DEN)

09:15
Santa Ana (SNA)
Effective from 2026-05-21
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 2:25, non-stop
Boeing 737 MAX 8 (7M8)
Direct Flights:
United Airlines UA2666
08:00
Denver (DEN)

09:36
Santa Ana (SNA)
Effective 2026-01-06 through 2026-02-11
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 2:36, non-stop
Boeing 737 MAX 8 (7M8)
Direct Flights:
United Airlines UA2666
08:01
Denver (DEN)

09:38
Santa Ana (SNA)
Valid until 2026-01-05
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 2:37, non-stop
Airbus A320 (320)
Direct Flights:
United Airlines UA2666
08:05
Denver (DEN)

09:45
Santa Ana (SNA)
Effective 2026-02-12 through 2026-03-04
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 2:40, non-stop
Boeing 737 MAX 8 (7M8)
Direct Flights:
United Airlines UA2666
08:08
Denver (DEN)

09:48
Santa Ana (SNA)
Effective 2026-03-05 through 2026-03-28
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 2:40, non-stop
Boeing 737 MAX 8 (7M8)
Direct Flights:
United Airlines UA2666
08:08
Denver (DEN)

09:42
Santa Ana (SNA)
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 UA2666
08:10
Denver (DEN)

09:44
Santa Ana (SNA)
Effective 2026-04-30 through 2026-05-20
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 2:34, non-stop
Airbus A320 (320)
Direct Flights:
United Airlines UA2666
11:00
Santa Ana (SNA)

12:40
San Francisco (SFO) 3
Effective from 2026-05-21
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 1:40, non-stop
Airbus A320 (320)
Non-Direct Flights:
United Airlines UA2666
05:15
Chicago O'Hare (ORD) 1

09:15
Santa Ana (SNA)
Effective from 2026-05-21
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 6:00, 1-stop
Boeing 737-900 (739)
Non-Direct Flights:
United Airlines UA2666
07:50
Denver (DEN)

12:40
San Francisco (SFO) 3
Effective from 2026-05-21
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 5:50, 1-stop
Boeing 737 MAX 8 (7M8)
Non-Direct Flights:
United Airlines UA2666
05:15
Chicago O'Hare (ORD) 1

12:40
San Francisco (SFO) 3
Effective from 2026-05-21
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 9:25, 2-stop
Boeing 737-900 (739)
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Parallax here -
This flight number is listed as serving the following routes:
  • Chicago O'Hare (ORD) - Denver (DEN)
  • Chicago O'Hare (ORD) - San Francisco (SFO)
  • Chicago O'Hare (ORD) - Santa Ana (SNA)
  • Denver (DEN) - San Francisco (SFO)
  • Denver (DEN) - Santa Ana (SNA)
  • Santa Ana (SNA) - San Francisco (SFO)
All United Airlines flights
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