United Airlines flight UA 1857: Multiple routes

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Select flight date:
FLIGHT SCHEDULE
Direct Flights:
Sat 07:40 Boston Logan (BOS) B 09:36 Chicago O'Hare (ORD) 1
UA 1857 Non-stop Boeing 737 MAX 8 (7M8) 2:56 Operates only on 2025-05-31
Sat 07:44 Boston Logan (BOS) B 09:39 Chicago O'Hare (ORD) 1
UA 1857 Non-stop Boeing 737-900 (739) 2:55 Effective 2025-06-28 through 2025-07-26
Mon,Thu,Fri,Sun 07:45 Boston Logan (BOS) B 09:43 Chicago O'Hare (ORD) 1
UA 1857 Non-stop Boeing 737-800 (738) 2:58 Effective 2025-05-22 through 2025-06-26
Sat 07:45 Boston Logan (BOS) B 09:43 Chicago O'Hare (ORD) 1
UA 1857 Non-stop Boeing 737 MAX 8 (7M8) 2:58 Operates only on 2025-05-24
Mon,Thu,Fri,Sun 07:45 Boston Logan (BOS) B 09:43 Chicago O'Hare (ORD) 1
UA 1857 Non-stop Boeing 737-900 (739) 2:58 Effective 2025-06-27 through 2025-07-31
Daily 10:37 Chicago O'Hare (ORD) 1 14:56 Miami (MIA)
UA 1857 Non-stop Airbus A321neo (32Q) 3:19 Valid until 2025-05-21
Daily 10:45 Chicago O'Hare (ORD) 1 14:55 Miami (MIA)
UA 1857 Non-stop Boeing 737-800 (738) 3:10 Effective from 2025-10-26
Daily 10:50 Chicago O'Hare (ORD) 1 15:10 Miami (MIA)
UA 1857 Non-stop Boeing 737-800 (738) 3:20 Effective 2025-06-26 through 2025-07-03
Fri 10:50 Chicago O'Hare (ORD) 1 15:10 Miami (MIA)
UA 1857 Non-stop Boeing 737 MAX 9 (7M9) 3:20 Operates only on 2025-07-04
Daily 10:50 Chicago O'Hare (ORD) 1 15:10 Miami (MIA)
UA 1857 Non-stop Boeing 737-800 (738) 3:20 Effective 2025-07-05 through 2025-07-31
Daily 10:50 Chicago O'Hare (ORD) 1 15:07 Miami (MIA)
UA 1857 Non-stop Boeing 737-800 (738) 3:17 Effective 2025-08-19 through 2025-09-24
Daily 10:54 Chicago O'Hare (ORD) 1 15:14 Miami (MIA)
UA 1857 Non-stop Boeing 737-800 (738) 3:20 Effective 2025-05-22 through 2025-06-25
Daily 10:54 Chicago O'Hare (ORD) 1 15:14 Miami (MIA)
UA 1857 Non-stop Boeing 737-800 (738) 3:20 Effective 2025-08-01 through 2025-08-18
Daily 10:55 Chicago O'Hare (ORD) 1 15:12 Miami (MIA)
UA 1857 Non-stop Boeing 737-800 (738) 3:17 Effective 2025-09-25 through 2025-10-25
Thu 18:14 Miami (MIA) 21:17 San Francisco (SFO) 3
UA 1857 Non-stop Boeing 737 MAX 8 (7M8) 6:03 Operates only on 2025-05-22
Fri 18:14 Miami (MIA) 21:17 San Francisco (SFO) 3
UA 1857 Non-stop Boeing 737-900 (739) 6:03 Operates only on 2025-05-23
Mon,Thu,Fri,Sun 18:14 Miami (MIA) 21:17 San Francisco (SFO) 3
UA 1857 Non-stop Boeing 737 MAX 9 (7M9) 6:03 Effective 2025-05-25 through 2025-05-30
Tue,Wed 18:14 Miami (MIA) 21:15 San Francisco (SFO) 3
UA 1857 Non-stop Boeing 737 MAX 9 (7M9) 6:01 Effective 2025-05-27 through 2025-05-28
Mon-Fri,Sun 18:17 Miami (MIA) 21:20 San Francisco (SFO) 3
UA 1857 Non-stop Boeing 737 MAX 9 (7M9) 6:03 Effective 2025-06-01 through 2025-06-25
Sat 18:23 Miami (MIA) 21:26 San Francisco (SFO) 3
UA 1857 Non-stop Boeing 737 MAX 9 (7M9) 6:03 Effective 2025-05-24 through 2025-05-31
Sat 18:35 Miami (MIA) 21:38 San Francisco (SFO) 3
UA 1857 Non-stop Boeing 737 MAX 9 (7M9) 6:03 Effective 2025-06-07 through 2025-06-21
Non-Direct Flights:
Sat 07:40 Boston Logan (BOS) B 15:14 Miami (MIA)
UA 1857 1-stop Boeing 737 MAX 8 (7M8) 7:34 Operates only on 2025-05-31
Sat 07:44 Boston Logan (BOS) B 15:10 Miami (MIA)
UA 1857 1-stop Boeing 737-900 (739) 7:26 Effective 2025-06-28 through 2025-07-26
Mon,Thu,Fri,Sun 07:45 Boston Logan (BOS) B 15:14 Miami (MIA)
UA 1857 1-stop Boeing 737-800 (738) 7:29 Effective 2025-05-22 through 2025-06-23
Sat 07:45 Boston Logan (BOS) B 15:14 Miami (MIA)
UA 1857 1-stop Boeing 737 MAX 8 (7M8) 7:29 Operates only on 2025-05-24
Thu 07:45 Boston Logan (BOS) B 15:10 Miami (MIA)
UA 1857 1-stop Boeing 737-800 (738) 7:25 Operates only on 2025-06-26
Mon,Thu,Fri,Sun 07:45 Boston Logan (BOS) B 15:10 Miami (MIA)
UA 1857 1-stop Boeing 737-900 (739) 7:25 Effective 2025-06-27 through 2025-07-31
Mon,Thu,Fri,Sun 10:54 Chicago O'Hare (ORD) 1 21:17 San Francisco (SFO) 3
UA 1857 1-stop Boeing 737-800 (738) 12:23 Effective 2025-05-22 through 2025-05-30
Sat 10:54 Chicago O'Hare (ORD) 1 21:26 San Francisco (SFO) 3
UA 1857 1-stop Boeing 737-800 (738) 12:32 Effective 2025-05-24 through 2025-05-31
Tue,Wed 10:54 Chicago O'Hare (ORD) 1 21:15 San Francisco (SFO) 3
UA 1857 1-stop Boeing 737-800 (738) 12:21 Effective 2025-05-27 through 2025-05-28
Mon-Fri,Sun 10:54 Chicago O'Hare (ORD) 1 21:20 San Francisco (SFO) 3
UA 1857 1-stop Boeing 737-800 (738) 12:26 Effective 2025-06-01 through 2025-06-25
Sat 10:54 Chicago O'Hare (ORD) 1 21:38 San Francisco (SFO) 3
UA 1857 1-stop Boeing 737-800 (738) 12:44 Effective 2025-06-07 through 2025-06-21
Sat 07:40 Boston Logan (BOS) B 21:26 San Francisco (SFO) 3
UA 1857 2-stop Boeing 737 MAX 8 (7M8) 16:46 Operates only on 2025-05-31
Mon,Thu,Fri,Sun 07:45 Boston Logan (BOS) B 21:17 San Francisco (SFO) 3
UA 1857 2-stop Boeing 737-800 (738) 16:32 Effective 2025-05-22 through 2025-05-30
Sat 07:45 Boston Logan (BOS) B 21:26 San Francisco (SFO) 3
UA 1857 2-stop Boeing 737 MAX 8 (7M8) 16:41 Operates only on 2025-05-24
Mon,Thu,Fri,Sun 07:45 Boston Logan (BOS) B 21:20 San Francisco (SFO) 3
UA 1857 2-stop Boeing 737-800 (738) 16:35 Effective 2025-06-01 through 2025-06-23
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This flight number is listed as serving the following routes:


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United Airlines flight UA 1857: Multiple routes
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Select flight date:
FLIGHT SCHEDULE
Direct Flights:
United Airlines UA1857
07:40
Boston Logan (BOS) B

09:36
Chicago O'Hare (ORD) 1
Operates only on 2025-05-31
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
Sun
-
Duration: 2:56, non-stop
Boeing 737 MAX 8 (7M8)
United Airlines UA1857
07:44
Boston Logan (BOS) B

09:39
Chicago O'Hare (ORD) 1
Effective 2025-06-28 through 2025-07-26
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
Sun
-
Duration: 2:55, non-stop
Boeing 737-900 (739)
United Airlines UA1857
07:45
Boston Logan (BOS) B

09:43
Chicago O'Hare (ORD) 1
Effective 2025-05-22 through 2025-06-26
Mon
Tue
-
Wed
-
Thu
Fri
Sat
-
Sun
Duration: 2:58, non-stop
Boeing 737-800 (738)
United Airlines UA1857
07:45
Boston Logan (BOS) B

09:43
Chicago O'Hare (ORD) 1
Operates only on 2025-05-24
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
Sun
-
Duration: 2:58, non-stop
Boeing 737 MAX 8 (7M8)
United Airlines UA1857
07:45
Boston Logan (BOS) B

09:43
Chicago O'Hare (ORD) 1
Effective 2025-06-27 through 2025-07-31
Mon
Tue
-
Wed
-
Thu
Fri
Sat
-
Sun
Duration: 2:58, non-stop
Boeing 737-900 (739)
United Airlines UA1857
10:37
Chicago O'Hare (ORD) 1

14:56
Miami (MIA)
Valid until 2025-05-21
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 3:19, non-stop
Airbus A321neo (32Q)
United Airlines UA1857
10:45
Chicago O'Hare (ORD) 1

14:55
Miami (MIA)
Effective from 2025-10-26
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 3:10, non-stop
Boeing 737-800 (738)
United Airlines UA1857
10:50
Chicago O'Hare (ORD) 1

15:10
Miami (MIA)
Effective 2025-06-26 through 2025-07-03
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 3:20, non-stop
Boeing 737-800 (738)
United Airlines UA1857
10:50
Chicago O'Hare (ORD) 1

15:10
Miami (MIA)
Operates only on 2025-07-04
Mon
-
Tue
-
Wed
-
Thu
-
Fri
Sat
-
Sun
-
Duration: 3:20, non-stop
Boeing 737 MAX 9 (7M9)
United Airlines UA1857
10:50
Chicago O'Hare (ORD) 1

15:10
Miami (MIA)
Effective 2025-07-05 through 2025-07-31
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 3:20, non-stop
Boeing 737-800 (738)
United Airlines UA1857
10:50
Chicago O'Hare (ORD) 1

15:07
Miami (MIA)
Effective 2025-08-19 through 2025-09-24
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 3:17, non-stop
Boeing 737-800 (738)
United Airlines UA1857
10:54
Chicago O'Hare (ORD) 1

15:14
Miami (MIA)
Effective 2025-05-22 through 2025-06-25
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 3:20, non-stop
Boeing 737-800 (738)
United Airlines UA1857
10:54
Chicago O'Hare (ORD) 1

15:14
Miami (MIA)
Effective 2025-08-01 through 2025-08-18
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 3:20, non-stop
Boeing 737-800 (738)
United Airlines UA1857
10:55
Chicago O'Hare (ORD) 1

15:12
Miami (MIA)
Effective 2025-09-25 through 2025-10-25
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 3:17, non-stop
Boeing 737-800 (738)
United Airlines UA1857
18:14
Miami (MIA)

21:17
San Francisco (SFO) 3
Operates only on 2025-05-22
Mon
-
Tue
-
Wed
-
Thu
Fri
-
Sat
-
Sun
-
Duration: 6:03, non-stop
Boeing 737 MAX 8 (7M8)
United Airlines UA1857
18:14
Miami (MIA)

21:17
San Francisco (SFO) 3
Operates only on 2025-05-23
Mon
-
Tue
-
Wed
-
Thu
-
Fri
Sat
-
Sun
-
Duration: 6:03, non-stop
Boeing 737-900 (739)
United Airlines UA1857
18:14
Miami (MIA)

21:17
San Francisco (SFO) 3
Effective 2025-05-25 through 2025-05-30
Mon
Tue
-
Wed
-
Thu
Fri
Sat
-
Sun
Duration: 6:03, non-stop
Boeing 737 MAX 9 (7M9)
United Airlines UA1857
18:14
Miami (MIA)

21:15
San Francisco (SFO) 3
Effective 2025-05-27 through 2025-05-28
Mon
-
Tue
Wed
Thu
-
Fri
-
Sat
-
Sun
-
Duration: 6:01, non-stop
Boeing 737 MAX 9 (7M9)
United Airlines UA1857
18:17
Miami (MIA)

21:20
San Francisco (SFO) 3
Effective 2025-06-01 through 2025-06-25
Mon
Tue
Wed
Thu
Fri
Sat
-
Sun
Duration: 6:03, non-stop
Boeing 737 MAX 9 (7M9)
United Airlines UA1857
18:23
Miami (MIA)

21:26
San Francisco (SFO) 3
Effective 2025-05-24 through 2025-05-31
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
Sun
-
Duration: 6:03, non-stop
Boeing 737 MAX 9 (7M9)
United Airlines UA1857
18:35
Miami (MIA)

21:38
San Francisco (SFO) 3
Effective 2025-06-07 through 2025-06-21
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
Sun
-
Duration: 6:03, non-stop
Boeing 737 MAX 9 (7M9)
Non-Direct Flights:
United Airlines UA1857
07:40
Boston Logan (BOS) B

15:14
Miami (MIA)
Operates only on 2025-05-31
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
Sun
-
Duration: 7:34, 1-stop
Boeing 737 MAX 8 (7M8)
United Airlines UA1857
07:44
Boston Logan (BOS) B

15:10
Miami (MIA)
Effective 2025-06-28 through 2025-07-26
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
Sun
-
Duration: 7:26, 1-stop
Boeing 737-900 (739)
United Airlines UA1857
07:45
Boston Logan (BOS) B

15:14
Miami (MIA)
Effective 2025-05-22 through 2025-06-23
Mon
Tue
-
Wed
-
Thu
Fri
Sat
-
Sun
Duration: 7:29, 1-stop
Boeing 737-800 (738)
United Airlines UA1857
07:45
Boston Logan (BOS) B

15:14
Miami (MIA)
Operates only on 2025-05-24
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
Sun
-
Duration: 7:29, 1-stop
Boeing 737 MAX 8 (7M8)
United Airlines UA1857
07:45
Boston Logan (BOS) B

15:10
Miami (MIA)
Operates only on 2025-06-26
Mon
-
Tue
-
Wed
-
Thu
Fri
-
Sat
-
Sun
-
Duration: 7:25, 1-stop
Boeing 737-800 (738)
United Airlines UA1857
07:45
Boston Logan (BOS) B

15:10
Miami (MIA)
Effective 2025-06-27 through 2025-07-31
Mon
Tue
-
Wed
-
Thu
Fri
Sat
-
Sun
Duration: 7:25, 1-stop
Boeing 737-900 (739)
United Airlines UA1857
10:54
Chicago O'Hare (ORD) 1

21:17
San Francisco (SFO) 3
Effective 2025-05-22 through 2025-05-30
Mon
Tue
-
Wed
-
Thu
Fri
Sat
-
Sun
Duration: 12:23, 1-stop
Boeing 737-800 (738)
United Airlines UA1857
10:54
Chicago O'Hare (ORD) 1

21:26
San Francisco (SFO) 3
Effective 2025-05-24 through 2025-05-31
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
Sun
-
Duration: 12:32, 1-stop
Boeing 737-800 (738)
United Airlines UA1857
10:54
Chicago O'Hare (ORD) 1

21:15
San Francisco (SFO) 3
Effective 2025-05-27 through 2025-05-28
Mon
-
Tue
Wed
Thu
-
Fri
-
Sat
-
Sun
-
Duration: 12:21, 1-stop
Boeing 737-800 (738)
United Airlines UA1857
10:54
Chicago O'Hare (ORD) 1

21:20
San Francisco (SFO) 3
Effective 2025-06-01 through 2025-06-25
Mon
Tue
Wed
Thu
Fri
Sat
-
Sun
Duration: 12:26, 1-stop
Boeing 737-800 (738)
United Airlines UA1857
10:54
Chicago O'Hare (ORD) 1

21:38
San Francisco (SFO) 3
Effective 2025-06-07 through 2025-06-21
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
Sun
-
Duration: 12:44, 1-stop
Boeing 737-800 (738)
United Airlines UA1857
07:40
Boston Logan (BOS) B

21:26
San Francisco (SFO) 3
Operates only on 2025-05-31
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
Sun
-
Duration: 16:46, 2-stop
Boeing 737 MAX 8 (7M8)
United Airlines UA1857
07:45
Boston Logan (BOS) B

21:17
San Francisco (SFO) 3
Effective 2025-05-22 through 2025-05-30
Mon
Tue
-
Wed
-
Thu
Fri
Sat
-
Sun
Duration: 16:32, 2-stop
Boeing 737-800 (738)
United Airlines UA1857
07:45
Boston Logan (BOS) B

21:26
San Francisco (SFO) 3
Operates only on 2025-05-24
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
Sun
-
Duration: 16:41, 2-stop
Boeing 737 MAX 8 (7M8)
United Airlines UA1857
07:45
Boston Logan (BOS) B

21:20
San Francisco (SFO) 3
Effective 2025-06-01 through 2025-06-23
Mon
Tue
-
Wed
-
Thu
Fri
Sat
-
Sun
Duration: 16:35, 2-stop
Boeing 737-800 (738)
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This flight number is listed as serving the following routes:
  • Boston Logan (BOS) - Chicago O'Hare (ORD)
  • Boston Logan (BOS) - Miami (MIA)
  • Boston Logan (BOS) - San Francisco (SFO)
  • Chicago O'Hare (ORD) - Miami (MIA)
  • Chicago O'Hare (ORD) - San Francisco (SFO)
  • Miami (MIA) - San Francisco (SFO)
All United Airlines flights
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