United Airlines flight UA 646: Multiple routes

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FLIGHT SCHEDULE
Direct Flights:
Daily 09:38 Houston George Bush (IAH) E 11:49 San Luis Potosi (SLP)
UA 646 Non-stop Boeing 737-700 (73G) 2:11 Valid until 2026-01-05
Daily 10:01 Houston George Bush (IAH) E 11:04 San Luis Potosi (SLP)
UA 646 Non-stop Boeing 737-700 (73G) 2:03 Effective 2026-05-21 through 2026-08-17
Daily 11:05 Orlando (MCO) B 13:26 Washington Dulles (IAD)
UA 646 Non-stop Boeing 737 MAX 9 (7M9) 2:21 Effective 2026-03-29 through 2026-04-29
Daily 11:07 Orlando (MCO) B 13:28 Washington Dulles (IAD)
UA 646 Non-stop Boeing 737-900 (739) 2:21 Effective 2026-04-30 through 2026-05-20
Daily 11:50 Salt Lake City (SLC) 18:11 Newark Liberty, New York (EWR) C
UA 646 Non-stop Boeing 737 MAX 8 (7M8) 4:21 Effective 2026-08-24 through 2026-09-07
Sat 11:50 Salt Lake City (SLC) 18:11 Newark Liberty, New York (EWR) C
UA 646 Non-stop Boeing 737 MAX 8 (7M8) 4:21 Effective 2026-09-12 through 2026-10-17
Wed 13:00 Raleigh/Durham (RDU) 2 15:19 Houston George Bush (IAH) C
UA 646 Non-stop Boeing 737 MAX 8 (7M8) 3:19 Operates only on 2026-02-04
Fri 13:56 New Orleans (MSY) 16:56 San Francisco (SFO) 3
UA 646 Non-stop Boeing 737-800 (738) 5:00 Effective 2026-03-06 through 2026-03-27
Mon,Wed-Fri 14:38 New Orleans (MSY) 17:39 San Francisco (SFO) 3
UA 646 Non-stop Boeing 737-800 (738) 5:01 Effective 2026-02-12 through 2026-03-04
Tue 14:38 New Orleans (MSY) 17:39 San Francisco (SFO) 3
UA 646 Non-stop Boeing 737-800 (738) 5:01 Operates only on 2026-02-17
Thu,Sat,Sun 14:39 New Orleans (MSY) 17:39 San Francisco (SFO) 3
UA 646 Non-stop Boeing 737-800 (738) 5:00 Effective 2026-03-05 through 2026-03-08
Mon-Thu,Sun 14:39 New Orleans (MSY) 17:41 San Francisco (SFO) 3
UA 646 Non-stop Airbus A319 (319) 5:02 Effective 2026-03-09 through 2026-03-26
Sat 14:39 New Orleans (MSY) 17:39 San Francisco (SFO) 3
UA 646 Non-stop Boeing 737-800 (738) 5:00 Effective 2026-03-14 through 2026-03-28
Sun 14:43 New Orleans (MSY) 17:44 San Francisco (SFO) 3
UA 646 Non-stop Boeing 737-800 (738) 5:01 Effective 2026-02-15 through 2026-03-01
Daily 15:25 Grand Rapids (GRR) 16:30 Denver (DEN)
UA 646 Non-stop Boeing 737-800 (738) 3:05 Effective 2026-01-06 through 2026-02-03
Daily 15:25 Grand Rapids (GRR) 16:30 Denver (DEN)
UA 646 Non-stop Boeing 737-800 (738) 3:05 Effective 2026-02-05 through 2026-02-11
Mon,Wed-Fri 18:42 San Francisco (SFO) 3 19:50 San Luis Obispo (SBP)
UA 646 Non-stop Airbus A320 (320) 1:08 Effective 2026-02-12 through 2026-03-04
Sun 18:47 San Francisco (SFO) 3 19:55 San Luis Obispo (SBP)
UA 646 Non-stop Airbus A320 (320) 1:08 Effective 2026-02-15 through 2026-03-01
Non-Direct Flights:
Mon,Wed-Fri 14:38 New Orleans (MSY) 19:50 San Luis Obispo (SBP)
UA 646 1-stop Boeing 737-800 (738) 7:12 Effective 2026-02-12 through 2026-03-04
Sun 14:43 New Orleans (MSY) 19:55 San Luis Obispo (SBP)
UA 646 1-stop Boeing 737-800 (738) 7:12 Effective 2026-02-15 through 2026-03-01
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This flight number is listed as serving the following routes:


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United Airlines flight UA 646: Multiple routes
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Select flight date:
FLIGHT SCHEDULE
Direct Flights:
United Airlines UA646
09:38
Houston George Bush (IAH) E

11:49
San Luis Potosi (SLP)
Valid until 2026-01-05
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 2:11, non-stop
Boeing 737-700 (73G)
Direct Flights:
United Airlines UA646
10:01
Houston George Bush (IAH) E

11:04
San Luis Potosi (SLP)
Effective 2026-05-21 through 2026-08-17
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 2:03, non-stop
Boeing 737-700 (73G)
Direct Flights:
United Airlines UA646
11:05
Orlando (MCO) B

13:26
Washington Dulles (IAD)
Effective 2026-03-29 through 2026-04-29
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 2:21, non-stop
Boeing 737 MAX 9 (7M9)
Direct Flights:
United Airlines UA646
11:07
Orlando (MCO) B

13:28
Washington Dulles (IAD)
Effective 2026-04-30 through 2026-05-20
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 2:21, non-stop
Boeing 737-900 (739)
Direct Flights:
United Airlines UA646
11:50
Salt Lake City (SLC)

18:11
Newark Liberty, New York (EWR) C
Effective 2026-08-24 through 2026-09-07
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 4:21, non-stop
Boeing 737 MAX 8 (7M8)
Direct Flights:
United Airlines UA646
11:50
Salt Lake City (SLC)

18:11
Newark Liberty, New York (EWR) C
Effective 2026-09-12 through 2026-10-17
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
Sun
-
Duration: 4:21, non-stop
Boeing 737 MAX 8 (7M8)
Direct Flights:
United Airlines UA646
13:00
Raleigh/Durham (RDU) 2

15:19
Houston George Bush (IAH) C
Operates only on 2026-02-04
Mon
-
Tue
-
Wed
Thu
-
Fri
-
Sat
-
Sun
-
Duration: 3:19, non-stop
Boeing 737 MAX 8 (7M8)
Direct Flights:
United Airlines UA646
13:56
New Orleans (MSY)

16:56
San Francisco (SFO) 3
Effective 2026-03-06 through 2026-03-27
Mon
-
Tue
-
Wed
-
Thu
-
Fri
Sat
-
Sun
-
Duration: 5:00, non-stop
Boeing 737-800 (738)
Direct Flights:
United Airlines UA646
14:38
New Orleans (MSY)

17:39
San Francisco (SFO) 3
Effective 2026-02-12 through 2026-03-04
Mon
Tue
-
Wed
Thu
Fri
Sat
-
Sun
-
Duration: 5:01, non-stop
Boeing 737-800 (738)
Direct Flights:
United Airlines UA646
14:38
New Orleans (MSY)

17:39
San Francisco (SFO) 3
Operates only on 2026-02-17
Mon
-
Tue
Wed
-
Thu
-
Fri
-
Sat
-
Sun
-
Duration: 5:01, non-stop
Boeing 737-800 (738)
Direct Flights:
United Airlines UA646
14:39
New Orleans (MSY)

17:39
San Francisco (SFO) 3
Effective 2026-03-05 through 2026-03-08
Mon
-
Tue
-
Wed
-
Thu
Fri
-
Sat
Sun
Duration: 5:00, non-stop
Boeing 737-800 (738)
Direct Flights:
United Airlines UA646
14:39
New Orleans (MSY)

17:41
San Francisco (SFO) 3
Effective 2026-03-09 through 2026-03-26
Mon
Tue
Wed
Thu
Fri
-
Sat
-
Sun
Duration: 5:02, non-stop
Airbus A319 (319)
Direct Flights:
United Airlines UA646
14:39
New Orleans (MSY)

17:39
San Francisco (SFO) 3
Effective 2026-03-14 through 2026-03-28
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
Sun
-
Duration: 5:00, non-stop
Boeing 737-800 (738)
Direct Flights:
United Airlines UA646
14:43
New Orleans (MSY)

17:44
San Francisco (SFO) 3
Effective 2026-02-15 through 2026-03-01
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
-
Sun
Duration: 5:01, non-stop
Boeing 737-800 (738)
Direct Flights:
United Airlines UA646
15:25
Grand Rapids (GRR)

16:30
Denver (DEN)
Effective 2026-01-06 through 2026-02-03
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 3:05, non-stop
Boeing 737-800 (738)
Direct Flights:
United Airlines UA646
15:25
Grand Rapids (GRR)

16:30
Denver (DEN)
Effective 2026-02-05 through 2026-02-11
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 3:05, non-stop
Boeing 737-800 (738)
Direct Flights:
United Airlines UA646
18:42
San Francisco (SFO) 3

19:50
San Luis Obispo (SBP)
Effective 2026-02-12 through 2026-03-04
Mon
Tue
-
Wed
Thu
Fri
Sat
-
Sun
-
Duration: 1:08, non-stop
Airbus A320 (320)
Direct Flights:
United Airlines UA646
18:47
San Francisco (SFO) 3

19:55
San Luis Obispo (SBP)
Effective 2026-02-15 through 2026-03-01
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
-
Sun
Duration: 1:08, non-stop
Airbus A320 (320)
Non-Direct Flights:
United Airlines UA646
14:38
New Orleans (MSY)

19:50
San Luis Obispo (SBP)
Effective 2026-02-12 through 2026-03-04
Mon
Tue
-
Wed
Thu
Fri
Sat
-
Sun
-
Duration: 7:12, 1-stop
Boeing 737-800 (738)
Non-Direct Flights:
United Airlines UA646
14:43
New Orleans (MSY)

19:55
San Luis Obispo (SBP)
Effective 2026-02-15 through 2026-03-01
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
-
Sun
Duration: 7:12, 1-stop
Boeing 737-800 (738)
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This flight number is listed as serving the following routes:
  • Grand Rapids (GRR) - Denver (DEN)
  • Houston George Bush (IAH) - San Luis Potosi (SLP)
  • New Orleans (MSY) - San Francisco (SFO)
  • New Orleans (MSY) - San Luis Obispo (SBP)
  • Orlando (MCO) - Washington Dulles (IAD)
  • Raleigh/Durham (RDU) - Houston George Bush (IAH)
  • Salt Lake City (SLC) - Newark Liberty, New York (EWR)
  • San Francisco (SFO) - San Luis Obispo (SBP)
All United Airlines flights
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