United Airlines flight UA 1851: Multiple routes

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Select flight date:
FLIGHT SCHEDULE
Direct Flights:
Daily 08:46 Chicago O'Hare (ORD) 1 11:33 Vancouver (YVR) M
UA 1851 Non-stop Boeing 737-800 (738) 4:47 Effective 2026-03-29 through 2026-04-19
Daily 11:05 Ontario, Los Angeles (ONT) 2 12:34 San Francisco (SFO) 3
UA 1851 Non-stop Boeing 737-900 (739) 1:29 Effective 2026-04-30 through 2026-05-20
Daily 14:29 Fort Lauderdale (FLL) 1 17:03 Chicago O'Hare (ORD) 1
UA 1851 Non-stop Airbus A321neo (32Q) 3:34 Effective 2026-03-05 through 2026-03-28
Mon-Sat 14:30 Fort Lauderdale (FLL) 1 17:04 Chicago O'Hare (ORD) 1
UA 1851 Non-stop Airbus A321neo (32Q) 3:34 Effective 2026-02-12 through 2026-03-04
Sun 14:30 Fort Lauderdale (FLL) 1 17:03 Chicago O'Hare (ORD) 1
UA 1851 Non-stop Boeing 757-300 (753) 3:33 Effective 2026-02-15 through 2026-03-01
Daily 14:30 Fort Lauderdale (FLL) 1 16:57 Chicago O'Hare (ORD) 1
UA 1851 Non-stop Boeing 737-900 (739) 3:27 Effective from 2026-10-25
Daily 14:32 Fort Lauderdale (FLL) 1 17:04 Chicago O'Hare (ORD) 1
UA 1851 Non-stop Airbus A321neo (32Q) 3:32 Effective 2026-01-06 through 2026-02-11
Daily 17:00 Kalispell (FCA) 19:20 Denver (DEN)
UA 1851 Non-stop Airbus A319 (319) 2:20 Effective 2026-05-21 through 2026-07-06
Mon,Fri-Sun 17:00 Kalispell (FCA) 19:20 Denver (DEN)
UA 1851 Non-stop Airbus A319 (319) 2:20 Effective 2026-07-10 through 2026-08-03
Daily 17:00 Kalispell (FCA) 19:20 Denver (DEN)
UA 1851 Non-stop Airbus A319 (319) 2:20 Effective 2026-08-04 through 2026-10-24
Mon,Tue,Thu-Sun 17:15 Kalispell (FCA) 19:35 Denver (DEN)
UA 1851 Non-stop Boeing 737-800 (738) 2:20 Valid until 2026-01-04
Mon 17:15 Kalispell (FCA) 19:35 Denver (DEN)
UA 1851 Non-stop Airbus A320 (320) 2:20 Operates only on 2026-01-05
Daily 18:07 Chicago O'Hare (ORD) 1 21:26 Providence (PVD)
UA 1851 Non-stop Airbus A319 (319) 2:19 Effective 2026-01-06 through 2026-01-17
Mon,Sun 18:07 Chicago O'Hare (ORD) 1 21:26 Providence (PVD)
UA 1851 Non-stop Airbus A320 (320) 2:19 Effective 2026-01-18 through 2026-01-19
Daily 18:07 Chicago O'Hare (ORD) 1 21:26 Providence (PVD)
UA 1851 Non-stop Airbus A319 (319) 2:19 Effective 2026-01-20 through 2026-01-30
Sat 18:07 Chicago O'Hare (ORD) 1 21:26 Providence (PVD)
UA 1851 Non-stop Airbus A320 (320) 2:19 Operates only on 2026-01-31
Daily 18:07 Chicago O'Hare (ORD) 1 21:26 Providence (PVD)
UA 1851 Non-stop Airbus A319 (319) 2:19 Effective 2026-02-01 through 2026-02-10
Mon,Thu-Sun 18:20 Chicago O'Hare (ORD) 1 21:35 Hartford (BDL)
UA 1851 Non-stop Boeing 737-900 (739) 2:15 Effective 2026-02-12 through 2026-03-02
Tue,Wed 18:20 Chicago O'Hare (ORD) 1 21:35 Hartford (BDL)
UA 1851 Non-stop Boeing 737 MAX 9 (7M9) 2:15 Effective 2026-02-17 through 2026-03-04
Mon-Thu,Sat,Sun 19:59 Chicago O'Hare (ORD) 1 22:25 Ontario, Los Angeles (ONT) 2
UA 1851 Non-stop Boeing 737 MAX 8 (7M8) 4:26 Effective 2026-03-05 through 2026-03-28
Fri 19:59 Chicago O'Hare (ORD) 1 22:25 Ontario, Los Angeles (ONT) 2
UA 1851 Non-stop Boeing 737-700 (73G) 4:26 Effective 2026-03-06 through 2026-03-27
Non-Direct Flights:
Daily 14:29 Fort Lauderdale (FLL) 1 22:25 Ontario, Los Angeles (ONT) 2
UA 1851 1-stop Airbus A321neo (32Q) 10:56 Effective 2026-03-05 through 2026-03-28
Mon-Sat 14:30 Fort Lauderdale (FLL) 1 21:35 Hartford (BDL)
UA 1851 1-stop Airbus A321neo (32Q) 7:05 Effective 2026-02-12 through 2026-03-04
Sun 14:30 Fort Lauderdale (FLL) 1 21:35 Hartford (BDL)
UA 1851 1-stop Boeing 757-300 (753) 7:05 Effective 2026-02-15 through 2026-03-01
Daily 14:32 Fort Lauderdale (FLL) 1 21:26 Providence (PVD)
UA 1851 1-stop Airbus A321neo (32Q) 6:54 Effective 2026-01-06 through 2026-02-10
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This flight number is listed as serving the following routes:


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United Airlines flight UA 1851: Multiple routes
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Select flight date:
FLIGHT SCHEDULE
Direct Flights:
United Airlines UA1851
08:46
Chicago O'Hare (ORD) 1

11:33
Vancouver (YVR) M
Effective 2026-03-29 through 2026-04-19
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 4:47, non-stop
Boeing 737-800 (738)
Direct Flights:
United Airlines UA1851
11:05
Ontario, Los Angeles (ONT) 2

12:34
San Francisco (SFO) 3
Effective 2026-04-30 through 2026-05-20
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 1:29, non-stop
Boeing 737-900 (739)
Direct Flights:
United Airlines UA1851
14:29
Fort Lauderdale (FLL) 1

17:03
Chicago O'Hare (ORD) 1
Effective 2026-03-05 through 2026-03-28
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 3:34, non-stop
Airbus A321neo (32Q)
Direct Flights:
United Airlines UA1851
14:30
Fort Lauderdale (FLL) 1

17:04
Chicago O'Hare (ORD) 1
Effective 2026-02-12 through 2026-03-04
Mon
Tue
Wed
Thu
Fri
Sat
Sun
-
Duration: 3:34, non-stop
Airbus A321neo (32Q)
Direct Flights:
United Airlines UA1851
14:30
Fort Lauderdale (FLL) 1

17:03
Chicago O'Hare (ORD) 1
Effective 2026-02-15 through 2026-03-01
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
-
Sun
Duration: 3:33, non-stop
Boeing 757-300 (753)
Direct Flights:
United Airlines UA1851
14:30
Fort Lauderdale (FLL) 1

16:57
Chicago O'Hare (ORD) 1
Effective from 2026-10-25
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 3:27, non-stop
Boeing 737-900 (739)
Direct Flights:
United Airlines UA1851
14:32
Fort Lauderdale (FLL) 1

17:04
Chicago O'Hare (ORD) 1
Effective 2026-01-06 through 2026-02-11
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 3:32, non-stop
Airbus A321neo (32Q)
Direct Flights:
United Airlines UA1851
17:00
Kalispell (FCA)

19:20
Denver (DEN)
Effective 2026-05-21 through 2026-07-06
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 2:20, non-stop
Airbus A319 (319)
Direct Flights:
United Airlines UA1851
17:00
Kalispell (FCA)

19:20
Denver (DEN)
Effective 2026-07-10 through 2026-08-03
Mon
Tue
-
Wed
-
Thu
-
Fri
Sat
Sun
Duration: 2:20, non-stop
Airbus A319 (319)
Direct Flights:
United Airlines UA1851
17:00
Kalispell (FCA)

19:20
Denver (DEN)
Effective 2026-08-04 through 2026-10-24
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 2:20, non-stop
Airbus A319 (319)
Direct Flights:
United Airlines UA1851
17:15
Kalispell (FCA)

19:35
Denver (DEN)
Valid until 2026-01-04
Mon
Tue
Wed
-
Thu
Fri
Sat
Sun
Duration: 2:20, non-stop
Boeing 737-800 (738)
Direct Flights:
United Airlines UA1851
17:15
Kalispell (FCA)

19:35
Denver (DEN)
Operates only on 2026-01-05
Mon
Tue
-
Wed
-
Thu
-
Fri
-
Sat
-
Sun
-
Duration: 2:20, non-stop
Airbus A320 (320)
Direct Flights:
United Airlines UA1851
18:07
Chicago O'Hare (ORD) 1

21:26
Providence (PVD)
Effective 2026-01-06 through 2026-01-17
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 2:19, non-stop
Airbus A319 (319)
Direct Flights:
United Airlines UA1851
18:07
Chicago O'Hare (ORD) 1

21:26
Providence (PVD)
Effective 2026-01-18 through 2026-01-19
Mon
Tue
-
Wed
-
Thu
-
Fri
-
Sat
-
Sun
Duration: 2:19, non-stop
Airbus A320 (320)
Direct Flights:
United Airlines UA1851
18:07
Chicago O'Hare (ORD) 1

21:26
Providence (PVD)
Effective 2026-01-20 through 2026-01-30
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 2:19, non-stop
Airbus A319 (319)
Direct Flights:
United Airlines UA1851
18:07
Chicago O'Hare (ORD) 1

21:26
Providence (PVD)
Operates only on 2026-01-31
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
Sun
-
Duration: 2:19, non-stop
Airbus A320 (320)
Direct Flights:
United Airlines UA1851
18:07
Chicago O'Hare (ORD) 1

21:26
Providence (PVD)
Effective 2026-02-01 through 2026-02-10
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 2:19, non-stop
Airbus A319 (319)
Direct Flights:
United Airlines UA1851
18:20
Chicago O'Hare (ORD) 1

21:35
Hartford (BDL)
Effective 2026-02-12 through 2026-03-02
Mon
Tue
-
Wed
-
Thu
Fri
Sat
Sun
Duration: 2:15, non-stop
Boeing 737-900 (739)
Direct Flights:
United Airlines UA1851
18:20
Chicago O'Hare (ORD) 1

21:35
Hartford (BDL)
Effective 2026-02-17 through 2026-03-04
Mon
-
Tue
Wed
Thu
-
Fri
-
Sat
-
Sun
-
Duration: 2:15, non-stop
Boeing 737 MAX 9 (7M9)
Direct Flights:
United Airlines UA1851
19:59
Chicago O'Hare (ORD) 1

22:25
Ontario, Los Angeles (ONT) 2
Effective 2026-03-05 through 2026-03-28
Mon
Tue
Wed
Thu
Fri
-
Sat
Sun
Duration: 4:26, non-stop
Boeing 737 MAX 8 (7M8)
Direct Flights:
United Airlines UA1851
19:59
Chicago O'Hare (ORD) 1

22:25
Ontario, Los Angeles (ONT) 2
Effective 2026-03-06 through 2026-03-27
Mon
-
Tue
-
Wed
-
Thu
-
Fri
Sat
-
Sun
-
Duration: 4:26, non-stop
Boeing 737-700 (73G)
Non-Direct Flights:
United Airlines UA1851
14:29
Fort Lauderdale (FLL) 1

22:25
Ontario, Los Angeles (ONT) 2
Effective 2026-03-05 through 2026-03-28
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 10:56, 1-stop
Airbus A321neo (32Q)
Non-Direct Flights:
United Airlines UA1851
14:30
Fort Lauderdale (FLL) 1

21:35
Hartford (BDL)
Effective 2026-02-12 through 2026-03-04
Mon
Tue
Wed
Thu
Fri
Sat
Sun
-
Duration: 7:05, 1-stop
Airbus A321neo (32Q)
Non-Direct Flights:
United Airlines UA1851
14:30
Fort Lauderdale (FLL) 1

21:35
Hartford (BDL)
Effective 2026-02-15 through 2026-03-01
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
-
Sun
Duration: 7:05, 1-stop
Boeing 757-300 (753)
Non-Direct Flights:
United Airlines UA1851
14:32
Fort Lauderdale (FLL) 1

21:26
Providence (PVD)
Effective 2026-01-06 through 2026-02-10
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 6:54, 1-stop
Airbus A321neo (32Q)
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Parallax here -
This flight number is listed as serving the following routes:
  • Chicago O'Hare (ORD) - Hartford (BDL)
  • Chicago O'Hare (ORD) - Ontario, Los Angeles (ONT)
  • Chicago O'Hare (ORD) - Providence (PVD)
  • Chicago O'Hare (ORD) - Vancouver (YVR)
  • Fort Lauderdale (FLL) - Chicago O'Hare (ORD)
  • Fort Lauderdale (FLL) - Hartford (BDL)
  • Fort Lauderdale (FLL) - Ontario, Los Angeles (ONT)
  • Fort Lauderdale (FLL) - Providence (PVD)
  • Kalispell (FCA) - Denver (DEN)
  • Ontario, Los Angeles (ONT) - San Francisco (SFO)
All United Airlines flights
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