United Airlines
flight
UA 644:
Multiple routes
FLIGHT SCHEDULE
Direct Flights:
United Airlines UA644
Effective 2026-04-30 through 2026-05-20
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 2:02, non-stop
Airbus A319 (319)
Airbus A319 (319)
Direct Flights:
United Airlines UA644
Effective 2026-03-29 through 2026-04-29
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 2:21, non-stop
Boeing 737-800 (738)
Boeing 737-800 (738)
Direct Flights:
United Airlines UA644
Valid until 2026-01-05
Mon
Tue
Wed
Thu
Fri
Sat
Sun
-
-
Duration: 4:42, non-stop
Boeing 737-800 (738)
Boeing 737-800 (738)
Direct Flights:
United Airlines UA644
Operates only on 2026-01-04
Mon
-
-
Tue
-
-
Wed
-
-
Thu
-
-
Fri
-
-
Sat
-
-
Sun
Duration: 4:42, non-stop
Boeing 737 MAX 8 (7M8)
Boeing 737 MAX 8 (7M8)
Direct Flights:
United Airlines UA644
Effective 2026-02-12 through 2026-03-04
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 4:30, non-stop
Boeing 737-800 (738)
Boeing 737-800 (738)
Direct Flights:
United Airlines UA644
Effective from 2026-05-21
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 2:15, non-stop
Airbus A320 (320)
Airbus A320 (320)
Direct Flights:
United Airlines UA644
Effective 2026-03-29 through 2026-04-29
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 2:47, non-stop
Boeing 737-900 (739)
Boeing 737-900 (739)
Direct Flights:
United Airlines UA644
Effective 2026-04-30 through 2026-05-20
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 2:54, non-stop
Boeing 737-900 (739)
Boeing 737-900 (739)
Direct Flights:
United Airlines UA644
Effective from 2026-05-21
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 2:54, non-stop
Boeing 737 MAX 9 (7M9)
Boeing 737 MAX 9 (7M9)
Direct Flights:
United Airlines UA644
Valid until 2026-01-05
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 2:55, non-stop
Boeing 737 MAX 9 (7M9)
Boeing 737 MAX 9 (7M9)
Direct Flights:
United Airlines UA644
Effective 2026-01-06 through 2026-02-02
Mon
Tue
Wed
Thu
Fri
Sat
-
-
Sun
Duration: 2:55, non-stop
Boeing 737 MAX 9 (7M9)
Boeing 737 MAX 9 (7M9)
Direct Flights:
United Airlines UA644
Effective 2026-01-10 through 2026-01-31
Mon
-
-
Tue
-
-
Wed
-
-
Thu
-
-
Fri
-
-
Sat
Sun
-
-
Duration: 2:55, non-stop
Boeing 737-800 (738)
Boeing 737-800 (738)
Direct Flights:
United Airlines UA644
Operates only on 2026-02-03
Mon
-
-
Tue
Wed
-
-
Thu
-
-
Fri
-
-
Sat
-
-
Sun
-
-
Duration: 2:56, non-stop
Airbus A319 (319)
Airbus A319 (319)
Direct Flights:
United Airlines UA644
Effective 2026-02-04 through 2026-02-07
Mon
-
-
Tue
-
-
Wed
Thu
-
-
Fri
-
-
Sat
Sun
-
-
Duration: 2:55, non-stop
Boeing 737-800 (738)
Boeing 737-800 (738)
Direct Flights:
United Airlines UA644
Effective 2026-02-05 through 2026-02-11
Mon
-
-
Tue
Wed
Thu
Fri
-
-
Sat
-
-
Sun
Duration: 2:55, non-stop
Boeing 737 MAX 9 (7M9)
Boeing 737 MAX 9 (7M9)
Direct Flights:
United Airlines UA644
Effective 2026-02-06 through 2026-02-09
Mon
Tue
-
-
Wed
-
-
Thu
-
-
Fri
Sat
-
-
Sun
-
-
Duration: 2:56, non-stop
Airbus A320 (320)
Airbus A320 (320)
Direct Flights:
United Airlines UA644
Effective 2026-02-12 through 2026-02-14
Mon
-
-
Tue
-
-
Wed
-
-
Thu
Fri
-
-
Sat
Sun
-
-
Duration: 2:54, non-stop
Boeing 737-800 (738)
Boeing 737-800 (738)
Direct Flights:
United Airlines UA644
Effective 2026-02-13 through 2026-03-04
Mon
Tue
Wed
Thu
-
-
Fri
Sat
-
-
Sun
-
-
Duration: 2:54, non-stop
Boeing 737 MAX 9 (7M9)
Boeing 737 MAX 9 (7M9)
Direct Flights:
United Airlines UA644
Effective 2026-02-15 through 2026-03-01
Mon
-
-
Tue
-
-
Wed
-
-
Thu
-
-
Fri
-
-
Sat
-
-
Sun
Duration: 2:54, non-stop
Airbus A320 (320)
Airbus A320 (320)
Direct Flights:
United Airlines UA644
Effective 2026-02-19 through 2026-02-26
Mon
-
-
Tue
-
-
Wed
-
-
Thu
Fri
-
-
Sat
-
-
Sun
-
-
Duration: 2:54, non-stop
Boeing 737 MAX 8 (7M8)
Boeing 737 MAX 8 (7M8)
Direct Flights:
United Airlines UA644
Effective 2026-02-21 through 2026-02-28
Mon
-
-
Tue
-
-
Wed
-
-
Thu
-
-
Fri
-
-
Sat
Sun
-
-
Duration: 2:54, non-stop
Boeing 737-800 (738)
Boeing 737-800 (738)
Direct Flights:
United Airlines UA644
Effective 2026-03-05 through 2026-03-11
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 2:54, non-stop
Boeing 737-900 (739)
Boeing 737-900 (739)
Direct Flights:
United Airlines UA644
Operates only on 2026-03-12
Mon
-
-
Tue
-
-
Wed
-
-
Thu
Fri
-
-
Sat
-
-
Sun
-
-
Duration: 2:54, non-stop
Boeing 737-800 (738)
Boeing 737-800 (738)
Direct Flights:
United Airlines UA644
Effective 2026-03-13 through 2026-03-28
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 2:54, non-stop
Boeing 737-900 (739)
Boeing 737-900 (739)
Non-Direct Flights:
United Airlines UA644
Effective 2026-04-30 through 2026-05-20
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 8:10, 1-stop
Airbus A319 (319)
Airbus A319 (319)
Non-Direct Flights:
United Airlines UA644
Effective 2026-03-29 through 2026-04-29
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 7:47, 1-stop
Boeing 737-800 (738)
Boeing 737-800 (738)
Non-Direct Flights:
United Airlines UA644
Valid until 2026-01-05
Mon
Tue
Wed
Thu
Fri
Sat
Sun
-
-
Duration: 9:05, 1-stop
Boeing 737-800 (738)
Boeing 737-800 (738)
Non-Direct Flights:
United Airlines UA644
Operates only on 2026-01-04
Mon
-
-
Tue
-
-
Wed
-
-
Thu
-
-
Fri
-
-
Sat
-
-
Sun
Duration: 9:05, 1-stop
Boeing 737 MAX 8 (7M8)
Boeing 737 MAX 8 (7M8)
Non-Direct Flights:
United Airlines UA644
Effective 2026-02-12 through 2026-03-04
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 9:04, 1-stop
Boeing 737-800 (738)
Boeing 737-800 (738)
Non-Direct Flights:
United Airlines UA644
Effective from 2026-05-21
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 6:35, 1-stop
Airbus A320 (320)
Airbus A320 (320)
This flight number is listed as serving the following routes:
- Dallas Fort Worth (DFW) - Denver (DEN)
- Dallas Fort Worth (DFW) - Portland (PDX)
- Denver (DEN) - Portland (PDX)
- Miami (MIA) - Denver (DEN)
- Miami (MIA) - Portland (PDX)
- Syracuse (SYR) - Denver (DEN)
- Syracuse (SYR) - Portland (PDX)