United Airlines
flight
UA 2121:
Multiple routes
Ad mobi flat here (320x100px) 6074960173 M FlightWNum Top Flat
FLIGHT SCHEDULE
Direct Flights:
United Airlines UA2121
Effective 2026-08-11 through 2026-10-24
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 2:18, non-stop
Airbus A320 (320)
Airbus A320 (320)
Direct Flights:
United Airlines UA2121
Effective 2026-04-30 through 2026-05-20
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 2:19, non-stop
Airbus A320 (320)
Airbus A320 (320)
Direct Flights:
United Airlines UA2121
Effective 2026-03-29 through 2026-04-29
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 2:19, non-stop
Airbus A320 (320)
Airbus A320 (320)
Direct Flights:
United Airlines UA2121
Effective 2026-05-21 through 2026-08-10
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 2:18, non-stop
Airbus A320 (320)
Airbus A320 (320)
Direct Flights:
United Airlines UA2121
Effective from 2026-10-25
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 2:18, non-stop
Airbus A320 (320)
Airbus A320 (320)
Direct Flights:
United Airlines UA2121
Effective from 2026-03-29
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 2:43, non-stop
Boeing 737-900 (739)
Boeing 737-900 (739)
Direct Flights:
United Airlines UA2121
Valid until 2026-01-05
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 4:13, non-stop
Boeing 737-900 (739)
Boeing 737-900 (739)
Direct Flights:
United Airlines UA2121
Effective 2026-02-12 through 2026-03-04
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 2:34, non-stop
Boeing 737-800 (738)
Boeing 737-800 (738)
Direct Flights:
United Airlines UA2121
Effective 2026-03-29 through 2026-04-29
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 2:41, non-stop
Boeing 737-900 (739)
Boeing 737-900 (739)
Direct Flights:
United Airlines UA2121
Effective 2026-01-06 through 2026-01-18
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 2:37, non-stop
Boeing 737-800 (738)
Boeing 737-800 (738)
Direct Flights:
United Airlines UA2121
Operates only on 2026-01-19
Mon
Tue
-
-
Wed
-
-
Thu
-
-
Fri
-
-
Sat
-
-
Sun
-
-
Duration: 2:37, non-stop
Boeing 737 MAX 9 (7M9)
Boeing 737 MAX 9 (7M9)
Direct Flights:
United Airlines UA2121
Effective 2026-01-20 through 2026-02-03
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 2:37, non-stop
Boeing 737-800 (738)
Boeing 737-800 (738)
Direct Flights:
United Airlines UA2121
Operates only on 2026-02-04
Mon
-
-
Tue
-
-
Wed
Thu
-
-
Fri
-
-
Sat
-
-
Sun
-
-
Duration: 2:37, non-stop
Boeing 737 MAX 9 (7M9)
Boeing 737 MAX 9 (7M9)
Direct Flights:
United Airlines UA2121
Effective 2026-02-05 through 2026-02-10
Mon
Tue
Wed
-
-
Thu
Fri
Sat
Sun
Duration: 2:37, non-stop
Boeing 737-800 (738)
Boeing 737-800 (738)
Direct Flights:
United Airlines UA2121
Effective 2026-04-30 through 2026-05-20
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 2:29, non-stop
Boeing 737-900 (739)
Boeing 737-900 (739)
Direct Flights:
United Airlines UA2121
Effective from 2026-05-21
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 2:29, non-stop
Boeing 737-800 (738)
Boeing 737-800 (738)
Direct Flights:
United Airlines UA2121
Effective 2026-03-05 through 2026-03-28
Mon
-
-
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 2:34, non-stop
Boeing 737-800 (738)
Boeing 737-800 (738)
Direct Flights:
United Airlines UA2121
Effective 2026-03-09 through 2026-03-23
Mon
Tue
-
-
Wed
-
-
Thu
-
-
Fri
-
-
Sat
-
-
Sun
-
-
Duration: 2:35, non-stop
Airbus A320 (320)
Airbus A320 (320)
Direct Flights:
United Airlines UA2121
Operates only on 2026-02-11
Mon
-
-
Tue
-
-
Wed
Thu
-
-
Fri
-
-
Sat
-
-
Sun
-
-
Duration: 2:37, non-stop
Boeing 737-800 (738)
Boeing 737-800 (738)
Non-Direct Flights:
United Airlines UA2121
Effective 2026-08-11 through 2026-10-24
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 6:53, 1-stop
Airbus A320 (320)
Airbus A320 (320)
Non-Direct Flights:
United Airlines UA2121
Effective 2026-04-30 through 2026-05-20
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 6:46, 1-stop
Airbus A320 (320)
Airbus A320 (320)
Non-Direct Flights:
United Airlines UA2121
Effective 2026-03-29 through 2026-04-29
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 6:26, 1-stop
Airbus A320 (320)
Airbus A320 (320)
Non-Direct Flights:
United Airlines UA2121
Effective 2026-05-21 through 2026-08-10
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 6:26, 1-stop
Airbus A320 (320)
Airbus A320 (320)
Non-Direct Flights:
United Airlines UA2121
Effective from 2026-10-25
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 6:26, 1-stop
Airbus A320 (320)
Airbus A320 (320)
Non-Direct Flights:
United Airlines UA2121
Effective 2026-03-29 through 2026-04-29
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 6:46, 1-stop
Boeing 737-900 (739)
Boeing 737-900 (739)
Non-Direct Flights:
United Airlines UA2121
Effective from 2026-04-30
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 6:44, 1-stop
Boeing 737-900 (739)
Boeing 737-900 (739)
Non-Direct Flights:
United Airlines UA2121
Effective 2026-08-11 through 2026-10-24
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 10:54, 2-stop
Airbus A320 (320)
Airbus A320 (320)
Non-Direct Flights:
United Airlines UA2121
Effective 2026-04-30 through 2026-05-20
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 10:47, 2-stop
Airbus A320 (320)
Airbus A320 (320)
Non-Direct Flights:
United Airlines UA2121
Effective 2026-03-29 through 2026-04-29
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 10:29, 2-stop
Airbus A320 (320)
Airbus A320 (320)
Non-Direct Flights:
United Airlines UA2121
Effective 2026-05-21 through 2026-08-10
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 10:27, 2-stop
Airbus A320 (320)
Airbus A320 (320)
Non-Direct Flights:
United Airlines UA2121
Effective from 2026-10-25
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 10:27, 2-stop
Airbus A320 (320)
Airbus A320 (320)
Ad mobi box here (300x250px) 8888825773 M FlightWNum Bottom Box
Parallax here -
This flight number is listed as serving the following routes:
- Denver (DEN) - Grand Rapids (GRR)
- San Francisco (SFO) - Denver (DEN)
- San Francisco (SFO) - Grand Rapids (GRR)
- Seattle-Tacoma (SEA) - Denver (DEN)
- Seattle-Tacoma (SEA) - Grand Rapids (GRR)
- Seattle-Tacoma (SEA) - San Francisco (SFO)
- Washington Dulles (IAD) - Denver (DEN)