United Airlines flight UA 644: Multiple routes

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FLIGHT SCHEDULE
Direct Flights:
Thu 07:00 New York LaGuardia (LGA) B 09:10 Denver (DEN)
UA 644 Non-stop Boeing 737 MAX 8 (7M8) 4:10 Operates only on 2025-06-26
Mon-Fri,Sun 07:00 New York LaGuardia (LGA) B 09:16 Denver (DEN)
UA 644 Non-stop Boeing 737 MAX 8 (7M8) 4:16 Effective 2025-06-27 through 2025-07-31
Sat 08:00 New York LaGuardia (LGA) B 10:16 Denver (DEN)
UA 644 Non-stop Boeing 737 MAX 8 (7M8) 4:16 Effective 2025-06-28 through 2025-07-26
Daily 08:00 Miami (MIA) 10:24 Denver (DEN)
UA 644 Non-stop Boeing 737-800 (738) 4:24 Effective 2025-08-01 through 2025-08-18
Daily 11:18 Denver (DEN) 13:00 Portland (PDX)
UA 644 Non-stop Airbus A321neo (32Q) 2:42 Effective 2025-05-22 through 2025-08-18
Daily 11:20 Denver (DEN) 13:03 Portland (PDX)
UA 644 Non-stop Airbus A321neo (32Q) 2:43 Effective 2025-09-25 through 2025-10-25
Daily 11:21 Denver (DEN) 13:15 Portland (PDX)
UA 644 Non-stop Airbus A321neo (32Q) 2:54 Effective 2025-08-19 through 2025-09-24
Daily 11:21 Denver (DEN) 13:15 Portland (PDX)
UA 644 Non-stop Boeing 737 MAX 9 (7M9) 2:54 Effective from 2025-10-26
Daily 15:41 Portland (PDX) 17:23 San Francisco (SFO) 3
UA 644 Non-stop Boeing 737-800 (738) 1:42 Effective 2025-12-02 through 2025-12-17
Daily 15:41 Portland (PDX) 17:23 San Francisco (SFO) 3
UA 644 Non-stop Boeing 737-800 (738) 1:42 Effective from 2026-02-12
Mon-Fri 15:42 Portland (PDX) 17:33 San Francisco (SFO) 3
UA 644 Non-stop Airbus A319 (319) 1:51 Effective 2025-05-22 through 2025-05-30
Daily 15:42 Portland (PDX) 17:33 San Francisco (SFO) 3
UA 644 Non-stop Airbus A319 (319) 1:51 Effective 2025-05-31 through 2025-06-25
Daily 15:44 Portland (PDX) 17:34 San Francisco (SFO) 3
UA 644 Non-stop Airbus A320 (320) 1:50 Effective 2025-08-19 through 2025-09-24
Daily 15:44 Portland (PDX) 17:35 San Francisco (SFO) 3
UA 644 Non-stop Airbus A320 (320) 1:51 Effective 2025-09-25 through 2025-10-25
Mon-Fri 15:56 Portland (PDX) 17:48 San Francisco (SFO) 3
UA 644 Non-stop Airbus A320 (320) 1:52 Valid until 2025-05-20
Wed 15:56 Portland (PDX) 17:48 San Francisco (SFO) 3
UA 644 Non-stop Boeing 737-900 (739) 1:52 Operates only on 2025-05-21
Daily 16:15 Portland (PDX) 18:10 San Francisco (SFO) 3
UA 644 Non-stop Boeing 737-800 (738) 1:55 Effective 2025-10-26 through 2025-12-01
Daily 20:55 San Francisco (SFO) 3 22:34 Eugene (EUG)
UA 644 Non-stop Airbus A319 (319) 1:39 Effective 2025-08-19 through 2025-09-24
Sat 21:00 San Francisco (SFO) 3 04:50 Pittsburgh (PIT)
UA 644 Non-stop Boeing 737 MAX 9 (7M9) 4:50 Effective 2025-06-07 through 2025-06-21
The flight arrives 1 day after departure.
Mon-Fri 21:05 San Francisco (SFO) 3 04:55 Pittsburgh (PIT)
UA 644 Non-stop Boeing 737 MAX 9 (7M9) 4:50 Effective 2025-05-22 through 2025-05-30
The flight arrives 1 day after departure.
Daily 21:05 San Francisco (SFO) 3 04:55 Pittsburgh (PIT)
UA 644 Non-stop Boeing 737 MAX 9 (7M9) 4:50 Effective 2025-05-31 through 2025-06-06
The flight arrives 1 day after departure.
Mon-Fri,Sun 21:05 San Francisco (SFO) 3 04:55 Pittsburgh (PIT)
UA 644 Non-stop Boeing 737 MAX 9 (7M9) 4:50 Effective 2025-06-08 through 2025-06-25
The flight arrives 1 day after departure.
Daily 21:14 San Francisco (SFO) 3 22:50 Eugene (EUG)
UA 644 Non-stop Boeing 737-800 (738) 1:36 Effective 2025-09-25 through 2025-10-25
Non-Direct Flights:
Thu 07:00 New York LaGuardia (LGA) B 13:00 Portland (PDX)
UA 644 1-stop Boeing 737 MAX 8 (7M8) 9:00 Operates only on 2025-06-26
Mon-Fri,Sun 07:00 New York LaGuardia (LGA) B 13:00 Portland (PDX)
UA 644 1-stop Boeing 737 MAX 8 (7M8) 9:00 Effective 2025-06-27 through 2025-07-31
Sat 08:00 New York LaGuardia (LGA) B 13:00 Portland (PDX)
UA 644 1-stop Boeing 737 MAX 8 (7M8) 8:00 Effective 2025-06-28 through 2025-07-26
Daily 08:00 Miami (MIA) 13:00 Portland (PDX)
UA 644 1-stop Boeing 737-800 (738) 8:00 Effective 2025-08-01 through 2025-08-18
Mon-Fri 11:18 Denver (DEN) 17:33 San Francisco (SFO) 3
UA 644 1-stop Airbus A321neo (32Q) 7:15 Effective 2025-05-22 through 2025-05-30
Daily 11:18 Denver (DEN) 17:33 San Francisco (SFO) 3
UA 644 1-stop Airbus A321neo (32Q) 7:15 Effective 2025-05-31 through 2025-06-25
Daily 11:20 Denver (DEN) 17:35 San Francisco (SFO) 3
UA 644 1-stop Airbus A321neo (32Q) 7:15 Effective 2025-09-25 through 2025-10-25
Daily 11:21 Denver (DEN) 17:34 San Francisco (SFO) 3
UA 644 1-stop Airbus A321neo (32Q) 7:13 Effective 2025-08-19 through 2025-09-24
Daily 11:21 Denver (DEN) 18:10 San Francisco (SFO) 3
UA 644 1-stop Boeing 737 MAX 9 (7M9) 7:49 Effective 2025-10-26 through 2025-12-01
Daily 11:21 Denver (DEN) 17:23 San Francisco (SFO) 3
UA 644 1-stop Boeing 737 MAX 9 (7M9) 7:02 Effective 2025-12-02 through 2025-12-17
Daily 11:21 Denver (DEN) 17:23 San Francisco (SFO) 3
UA 644 1-stop Boeing 737 MAX 9 (7M9) 7:02 Effective from 2026-02-12
Mon-Fri 15:42 Portland (PDX) 04:55 Pittsburgh (PIT)
UA 644 1-stop Airbus A319 (319) 10:13 Effective 2025-05-22 through 2025-05-30
The flight arrives 1 day after departure.
Daily 15:42 Portland (PDX) 04:55 Pittsburgh (PIT)
UA 644 1-stop Airbus A319 (319) 10:13 Effective 2025-05-31 through 2025-06-06
The flight arrives 1 day after departure.
Sat 15:42 Portland (PDX) 04:50 Pittsburgh (PIT)
UA 644 1-stop Airbus A319 (319) 10:08 Effective 2025-06-07 through 2025-06-21
The flight arrives 1 day after departure.
Mon-Fri,Sun 15:42 Portland (PDX) 04:55 Pittsburgh (PIT)
UA 644 1-stop Airbus A319 (319) 10:13 Effective 2025-06-08 through 2025-06-25
The flight arrives 1 day after departure.
Daily 15:44 Portland (PDX) 22:34 Eugene (EUG)
UA 644 1-stop Airbus A320 (320) 6:50 Effective 2025-08-19 through 2025-09-24
Daily 15:44 Portland (PDX) 22:50 Eugene (EUG)
UA 644 1-stop Airbus A320 (320) 7:06 Effective 2025-09-25 through 2025-10-25
Mon-Fri 11:18 Denver (DEN) 04:55 Pittsburgh (PIT)
UA 644 2-stop Airbus A321neo (32Q) 15:37 Effective 2025-05-22 through 2025-05-30
The flight arrives 1 day after departure.
Daily 11:18 Denver (DEN) 04:55 Pittsburgh (PIT)
UA 644 2-stop Airbus A321neo (32Q) 15:37 Effective 2025-05-31 through 2025-06-06
The flight arrives 1 day after departure.
Sat 11:18 Denver (DEN) 04:50 Pittsburgh (PIT)
UA 644 2-stop Airbus A321neo (32Q) 15:32 Effective 2025-06-07 through 2025-06-21
The flight arrives 1 day after departure.
Mon-Fri,Sun 11:18 Denver (DEN) 04:55 Pittsburgh (PIT)
UA 644 2-stop Airbus A321neo (32Q) 15:37 Effective 2025-06-08 through 2025-06-25
The flight arrives 1 day after departure.
Daily 11:20 Denver (DEN) 22:50 Eugene (EUG)
UA 644 2-stop Airbus A321neo (32Q) 12:30 Effective 2025-09-25 through 2025-10-25
Daily 11:21 Denver (DEN) 22:34 Eugene (EUG)
UA 644 2-stop Airbus A321neo (32Q) 12:13 Effective 2025-08-19 through 2025-09-24
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This flight number is listed as serving the following routes:
United Airlines flight UA 644: Multiple routes
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FLIGHT SCHEDULE
Direct Flights:

United Airlines UA644
Operates only on 2025-06-26
Mon
-
Tue
-
Wed
-
Thu
Fri
-
Sat
-
Sun
-
Duration: 4:10, non-stop
Boeing 737 MAX 8 (7M8)

United Airlines UA644
Effective 2025-06-27 through 2025-07-31
Mon
Tue
Wed
Thu
Fri
Sat
-
Sun
Duration: 4:16, non-stop
Boeing 737 MAX 8 (7M8)

United Airlines UA644
Effective 2025-06-28 through 2025-07-26
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
Sun
-
Duration: 4:16, non-stop
Boeing 737 MAX 8 (7M8)

United Airlines UA644
Effective 2025-08-01 through 2025-08-18
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 4:24, non-stop
Boeing 737-800 (738)

United Airlines UA644
Effective 2025-05-22 through 2025-08-18
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 2:42, non-stop
Airbus A321neo (32Q)

United Airlines UA644
Effective 2025-09-25 through 2025-10-25
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 2:43, non-stop
Airbus A321neo (32Q)

United Airlines UA644
Effective 2025-08-19 through 2025-09-24
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 2:54, non-stop
Airbus A321neo (32Q)

United Airlines UA644
Effective from 2025-10-26
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 2:54, non-stop
Boeing 737 MAX 9 (7M9)

United Airlines UA644
Effective 2025-12-02 through 2025-12-17
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 1:42, non-stop
Boeing 737-800 (738)

United Airlines UA644
Effective from 2026-02-12
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 1:42, non-stop
Boeing 737-800 (738)

United Airlines UA644
Effective 2025-05-22 through 2025-05-30
Mon
Tue
Wed
Thu
Fri
Sat
-
Sun
-
Duration: 1:51, non-stop
Airbus A319 (319)

United Airlines UA644
Effective 2025-05-31 through 2025-06-25
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 1:51, non-stop
Airbus A319 (319)

United Airlines UA644
Effective 2025-08-19 through 2025-09-24
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 1:50, non-stop
Airbus A320 (320)

United Airlines UA644
Effective 2025-09-25 through 2025-10-25
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 1:51, non-stop
Airbus A320 (320)

United Airlines UA644
Valid until 2025-05-20
Mon
Tue
Wed
Thu
Fri
Sat
-
Sun
-
Duration: 1:52, non-stop
Airbus A320 (320)

United Airlines UA644
Operates only on 2025-05-21
Mon
-
Tue
-
Wed
Thu
-
Fri
-
Sat
-
Sun
-
Duration: 1:52, non-stop
Boeing 737-900 (739)

United Airlines UA644
Effective 2025-10-26 through 2025-12-01
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 1:55, non-stop
Boeing 737-800 (738)

United Airlines UA644
Effective 2025-08-19 through 2025-09-24
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 1:39, non-stop
Airbus A319 (319)

United Airlines UA644
Effective 2025-06-07 through 2025-06-21
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
Sun
-
Duration: 4:50, non-stop
Boeing 737 MAX 9 (7M9)
The flight arrives 1 day after departure.

United Airlines UA644
Effective 2025-05-22 through 2025-05-30
Mon
Tue
Wed
Thu
Fri
Sat
-
Sun
-
Duration: 4:50, non-stop
Boeing 737 MAX 9 (7M9)
The flight arrives 1 day after departure.

United Airlines UA644
Effective 2025-05-31 through 2025-06-06
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 4:50, non-stop
Boeing 737 MAX 9 (7M9)
The flight arrives 1 day after departure.

United Airlines UA644
Effective 2025-06-08 through 2025-06-25
Mon
Tue
Wed
Thu
Fri
Sat
-
Sun
Duration: 4:50, non-stop
Boeing 737 MAX 9 (7M9)
The flight arrives 1 day after departure.

United Airlines UA644
Effective 2025-09-25 through 2025-10-25
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 1:36, non-stop
Boeing 737-800 (738)

Non-Direct Flights:

United Airlines UA644
Operates only on 2025-06-26
Mon
-
Tue
-
Wed
-
Thu
Fri
-
Sat
-
Sun
-
Duration: 9:00, 1-stop
Boeing 737 MAX 8 (7M8)

United Airlines UA644
Effective 2025-06-27 through 2025-07-31
Mon
Tue
Wed
Thu
Fri
Sat
-
Sun
Duration: 9:00, 1-stop
Boeing 737 MAX 8 (7M8)

United Airlines UA644
Effective 2025-06-28 through 2025-07-26
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
Sun
-
Duration: 8:00, 1-stop
Boeing 737 MAX 8 (7M8)

United Airlines UA644
Effective 2025-08-01 through 2025-08-18
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 8:00, 1-stop
Boeing 737-800 (738)

United Airlines UA644
Effective 2025-05-22 through 2025-05-30
Mon
Tue
Wed
Thu
Fri
Sat
-
Sun
-
Duration: 7:15, 1-stop
Airbus A321neo (32Q)

United Airlines UA644
Effective 2025-05-31 through 2025-06-25
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 7:15, 1-stop
Airbus A321neo (32Q)

United Airlines UA644
Effective 2025-09-25 through 2025-10-25
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 7:15, 1-stop
Airbus A321neo (32Q)

United Airlines UA644
Effective 2025-08-19 through 2025-09-24
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 7:13, 1-stop
Airbus A321neo (32Q)

United Airlines UA644
Effective 2025-10-26 through 2025-12-01
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 7:49, 1-stop
Boeing 737 MAX 9 (7M9)

United Airlines UA644
Effective 2025-12-02 through 2025-12-17
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 7:02, 1-stop
Boeing 737 MAX 9 (7M9)

United Airlines UA644
Effective from 2026-02-12
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 7:02, 1-stop
Boeing 737 MAX 9 (7M9)

United Airlines UA644
Effective 2025-05-22 through 2025-05-30
Mon
Tue
Wed
Thu
Fri
Sat
-
Sun
-
Duration: 10:13, 1-stop
Airbus A319 (319)
The flight arrives 1 day after departure.

United Airlines UA644
Effective 2025-05-31 through 2025-06-06
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 10:13, 1-stop
Airbus A319 (319)
The flight arrives 1 day after departure.

United Airlines UA644
Effective 2025-06-07 through 2025-06-21
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
Sun
-
Duration: 10:08, 1-stop
Airbus A319 (319)
The flight arrives 1 day after departure.

United Airlines UA644
Effective 2025-06-08 through 2025-06-25
Mon
Tue
Wed
Thu
Fri
Sat
-
Sun
Duration: 10:13, 1-stop
Airbus A319 (319)
The flight arrives 1 day after departure.

United Airlines UA644
Effective 2025-08-19 through 2025-09-24
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 6:50, 1-stop
Airbus A320 (320)

United Airlines UA644
Effective 2025-09-25 through 2025-10-25
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 7:06, 1-stop
Airbus A320 (320)

United Airlines UA644
11:18

04:55(+1)
Effective 2025-05-22 through 2025-05-30
Mon
Tue
Wed
Thu
Fri
Sat
-
Sun
-
Duration: 15:37, 2-stop
Airbus A321neo (32Q)
The flight arrives 1 day after departure.

United Airlines UA644
11:18

04:55(+1)
Effective 2025-05-31 through 2025-06-06
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 15:37, 2-stop
Airbus A321neo (32Q)
The flight arrives 1 day after departure.

United Airlines UA644
11:18

04:50(+1)
Effective 2025-06-07 through 2025-06-21
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
Sun
-
Duration: 15:32, 2-stop
Airbus A321neo (32Q)
The flight arrives 1 day after departure.

United Airlines UA644
11:18

04:55(+1)
Effective 2025-06-08 through 2025-06-25
Mon
Tue
Wed
Thu
Fri
Sat
-
Sun
Duration: 15:37, 2-stop
Airbus A321neo (32Q)
The flight arrives 1 day after departure.

United Airlines UA644
Effective 2025-09-25 through 2025-10-25
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 12:30, 2-stop
Airbus A321neo (32Q)

United Airlines UA644
Effective 2025-08-19 through 2025-09-24
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 12:13, 2-stop
Airbus A321neo (32Q)
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This flight number is listed as serving the following routes:
  • Denver (DEN) - Eugene (EUG)
  • Denver (DEN) - Pittsburgh (PIT)
  • Denver (DEN) - Portland (PDX)
  • Denver (DEN) - San Francisco (SFO)
  • Miami (MIA) - Denver (DEN)
  • Miami (MIA) - Portland (PDX)
  • New York LaGuardia (LGA) - Denver (DEN)
  • New York LaGuardia (LGA) - Portland (PDX)
  • Portland (PDX) - Eugene (EUG)
  • Portland (PDX) - Pittsburgh (PIT)
  • Portland (PDX) - San Francisco (SFO)
  • San Francisco (SFO) - Eugene (EUG)
  • San Francisco (SFO) - Pittsburgh (PIT)