United Airlines
flight
UA 645:
Multiple routes
FLIGHT SCHEDULE
Direct Flights:
United Airlines UA645
Effective 2026-03-05 through 2026-03-28
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 4:15, non-stop
Boeing 737-800 (738)
Boeing 737-800 (738)
Direct Flights:
United Airlines UA645
Effective 2026-03-29 through 2026-04-29
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 4:11, non-stop
Boeing 737-800 (738)
Boeing 737-800 (738)
Direct Flights:
United Airlines UA645
Effective 2026-02-12 through 2026-03-04
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 4:15, non-stop
Boeing 737 MAX 8 (7M8)
Boeing 737 MAX 8 (7M8)
Direct Flights:
United Airlines UA645
Effective from 2026-04-30
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 4:05, non-stop
Boeing 737-800 (738)
Boeing 737-800 (738)
Direct Flights:
United Airlines UA645
Valid until 2026-01-03
Mon
Tue
Wed
Thu
Fri
Sat
Sun
-
-
Duration: 2:27, non-stop
Boeing 737-800 (738)
Boeing 737-800 (738)
Direct Flights:
United Airlines UA645
Valid until 2026-01-04
Mon
-
-
Tue
-
-
Wed
-
-
Thu
-
-
Fri
-
-
Sat
-
-
Sun
Duration: 2:28, non-stop
Airbus A321neo (32Q)
Airbus A321neo (32Q)
Direct Flights:
United Airlines UA645
Operates only on 2026-01-05
Mon
Tue
-
-
Wed
-
-
Thu
-
-
Fri
-
-
Sat
-
-
Sun
-
-
Duration: 2:27, non-stop
Boeing 737 MAX 8 (7M8)
Boeing 737 MAX 8 (7M8)
Direct Flights:
United Airlines UA645
Valid until 2026-01-05
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 1:35, non-stop
Boeing 737-800 (738)
Boeing 737-800 (738)
Direct Flights:
United Airlines UA645
Effective 2026-01-06 through 2026-02-10
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 1:42, non-stop
Boeing 737-800 (738)
Boeing 737-800 (738)
Direct Flights:
United Airlines UA645
Operates only on 2026-02-11
Mon
-
-
Tue
-
-
Wed
Thu
-
-
Fri
-
-
Sat
-
-
Sun
-
-
Duration: 1:42, non-stop
Boeing 737-900 (739)
Boeing 737-900 (739)
Direct Flights:
United Airlines UA645
Effective 2026-03-29 through 2026-04-29
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 1:39, non-stop
Airbus A319 (319)
Airbus A319 (319)
Direct Flights:
United Airlines UA645
Effective 2026-02-12 through 2026-03-04
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 1:34, non-stop
Boeing 737-800 (738)
Boeing 737-800 (738)
Direct Flights:
United Airlines UA645
Effective 2026-03-05 through 2026-03-28
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 1:34, non-stop
Boeing 737-800 (738)
Boeing 737-800 (738)
Direct Flights:
United Airlines UA645
Effective 2026-04-30 through 2026-05-20
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 1:26, non-stop
Boeing 737-800 (738)
Boeing 737-800 (738)
Direct Flights:
United Airlines UA645
Effective from 2026-05-21
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 1:26, non-stop
Airbus A320 (320)
Airbus A320 (320)
Non-Direct Flights:
United Airlines UA645
Effective 2026-03-05 through 2026-03-28
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 9:39, 1-stop
Boeing 737-800 (738)
Boeing 737-800 (738)
Non-Direct Flights:
United Airlines UA645
Effective 2026-03-29 through 2026-04-29
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 9:30, 1-stop
Boeing 737-800 (738)
Boeing 737-800 (738)
Non-Direct Flights:
United Airlines UA645
Effective 2026-02-12 through 2026-03-04
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 9:19, 1-stop
Boeing 737 MAX 8 (7M8)
Boeing 737 MAX 8 (7M8)
Non-Direct Flights:
United Airlines UA645
Effective from 2026-04-30
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 9:21, 1-stop
Boeing 737-800 (738)
Boeing 737-800 (738)
Non-Direct Flights:
United Airlines UA645
Valid until 2026-01-03
Mon
Tue
Wed
Thu
Fri
Sat
Sun
-
-
Duration: 4:50, 1-stop
Boeing 737-800 (738)
Boeing 737-800 (738)
Non-Direct Flights:
United Airlines UA645
Valid until 2026-01-04
Mon
-
-
Tue
-
-
Wed
-
-
Thu
-
-
Fri
-
-
Sat
-
-
Sun
Duration: 4:50, 1-stop
Airbus A321neo (32Q)
Airbus A321neo (32Q)
Non-Direct Flights:
United Airlines UA645
Operates only on 2026-01-05
Mon
Tue
-
-
Wed
-
-
Thu
-
-
Fri
-
-
Sat
-
-
Sun
-
-
Duration: 4:50, 1-stop
Boeing 737 MAX 8 (7M8)
Boeing 737 MAX 8 (7M8)
This flight number is listed as serving the following routes:
- Denver (DEN) - Sioux Falls (FSD)
- Los Angeles (LAX) - Denver (DEN)
- Los Angeles (LAX) - Sioux Falls (FSD)
- Tampa (TPA) - Denver (DEN)
- Tampa (TPA) - Sioux Falls (FSD)