United Airlines flight UA 688: Multiple routes

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Select flight date:
FLIGHT SCHEDULE
Direct Flights:
Daily 06:00 San Francisco (SFO) 3 07:31 Los Angeles (LAX) 7
UA 688 Non-stop Boeing 737-800 (738) 1:31 Valid until 2026-01-05
Sat,Sun 07:00 Las Vegas Harry Reid (LAS) 3 14:20 Washington Dulles (IAD)
UA 688 Non-stop Boeing 737 MAX 9 (7M9) 4:20 Effective 2026-05-23 through 2026-06-21
Sat 08:10 Las Vegas Harry Reid (LAS) 3 15:47 Washington Dulles (IAD)
UA 688 Non-stop Boeing 737-900 (739) 4:37 Effective 2026-04-04 through 2026-04-25
Sat 08:35 Las Vegas Harry Reid (LAS) 3 15:55 Washington Dulles (IAD)
UA 688 Non-stop Boeing 737 MAX 9 (7M9) 4:20 Effective 2026-05-02 through 2026-05-16
Sat 08:35 Las Vegas Harry Reid (LAS) 3 15:55 Washington Dulles (IAD)
UA 688 Non-stop Boeing 737 MAX 9 (7M9) 4:20 Effective 2026-08-22 through 2026-09-05
Daily 08:40 Los Angeles (LAX) 7 16:22 Washington Dulles (IAD)
UA 688 Non-stop Boeing 787-9 (789) 4:42 Valid until 2026-01-05
Tue 10:05 Salt Lake City (SLC) 15:59 Washington Dulles (IAD)
UA 688 Non-stop Boeing 737-800 (738) 3:54 Operates only on 2026-01-06
Mon-Wed 10:05 Salt Lake City (SLC) 15:59 Washington Dulles (IAD)
UA 688 Non-stop Boeing 737-700 (73G) 3:54 Effective 2026-01-07 through 2026-02-11
Thu-Sun 10:05 Salt Lake City (SLC) 15:59 Washington Dulles (IAD)
UA 688 Non-stop Boeing 737 MAX 8 (7M8) 3:54 Effective 2026-01-08 through 2026-02-08
Mon-Wed,Sun 17:10 Washington Dulles (IAD) 18:48 Boston Logan (BOS) B
UA 688 Non-stop Airbus A320 (320) 1:38 Valid until 2026-01-04
Mon,Thu,Fri 17:10 Washington Dulles (IAD) 18:48 Boston Logan (BOS) B
UA 688 Non-stop Airbus A319 (319) 1:38 Valid until 2026-01-05
Daily 17:10 Washington Dulles (IAD) 19:06 Boston Logan (BOS) B
UA 688 Non-stop Boeing 737-900 (739) 1:56 Effective 2026-03-29 through 2026-05-20
Daily 17:10 Washington Dulles (IAD) 18:44 Boston Logan (BOS) B
UA 688 Non-stop Boeing 737-900 (739) 1:34 Effective from 2026-05-21
Daily 17:20 Washington Dulles (IAD) 18:57 Boston Logan (BOS) B
UA 688 Non-stop Boeing 737-900 (739) 1:37 Effective 2026-01-06 through 2026-02-11
Daily 17:27 Washington Dulles (IAD) 19:08 Boston Logan (BOS) B
UA 688 Non-stop Boeing 737-900 (739) 1:41 Effective 2026-02-12 through 2026-03-07
Daily 17:55 Washington Dulles (IAD) 19:36 Boston Logan (BOS) B
UA 688 Non-stop Boeing 737-900 (739) 1:41 Effective 2026-03-08 through 2026-03-28
Non-Direct Flights:
Daily 06:00 San Francisco (SFO) 3 16:22 Washington Dulles (IAD)
UA 688 1-stop Boeing 737-800 (738) 7:22 Valid until 2026-01-05
Sat,Sun 07:00 Las Vegas Harry Reid (LAS) 3 18:44 Boston Logan (BOS) B
UA 688 1-stop Boeing 737 MAX 9 (7M9) 8:44 Effective 2026-05-23 through 2026-06-21
Sat 08:10 Las Vegas Harry Reid (LAS) 3 19:06 Boston Logan (BOS) B
UA 688 1-stop Boeing 737-900 (739) 7:56 Effective 2026-04-04 through 2026-04-25
Sat 08:35 Las Vegas Harry Reid (LAS) 3 19:06 Boston Logan (BOS) B
UA 688 1-stop Boeing 737 MAX 9 (7M9) 7:31 Effective 2026-05-02 through 2026-05-16
Sat 08:35 Las Vegas Harry Reid (LAS) 3 18:44 Boston Logan (BOS) B
UA 688 1-stop Boeing 737 MAX 9 (7M9) 7:09 Effective 2026-08-22 through 2026-09-05
Mon-Fri,Sun 08:40 Los Angeles (LAX) 7 18:48 Boston Logan (BOS) B
UA 688 1-stop Boeing 787-9 (789) 7:08 Valid until 2026-01-05
Tue 10:05 Salt Lake City (SLC) 18:57 Boston Logan (BOS) B
UA 688 1-stop Boeing 737-800 (738) 6:52 Operates only on 2026-01-06
Mon-Wed 10:05 Salt Lake City (SLC) 18:57 Boston Logan (BOS) B
UA 688 1-stop Boeing 737-700 (73G) 6:52 Effective 2026-01-07 through 2026-02-11
Thu-Sun 10:05 Salt Lake City (SLC) 18:57 Boston Logan (BOS) B
UA 688 1-stop Boeing 737 MAX 8 (7M8) 6:52 Effective 2026-01-08 through 2026-02-08
Mon-Fri,Sun 06:00 San Francisco (SFO) 3 18:48 Boston Logan (BOS) B
UA 688 2-stop Boeing 737-800 (738) 9:48 Valid until 2026-01-05
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This flight number is listed as serving the following routes:


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United Airlines flight UA 688: Multiple routes
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Select flight date:
FLIGHT SCHEDULE
Direct Flights:
United Airlines UA688
06:00
San Francisco (SFO) 3

07:31
Los Angeles (LAX) 7
Valid until 2026-01-05
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 1:31, non-stop
Boeing 737-800 (738)
Direct Flights:
United Airlines UA688
07:00
Las Vegas Harry Reid (LAS) 3

14:20
Washington Dulles (IAD)
Effective 2026-05-23 through 2026-06-21
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
Sun
Duration: 4:20, non-stop
Boeing 737 MAX 9 (7M9)
Direct Flights:
United Airlines UA688
08:10
Las Vegas Harry Reid (LAS) 3

15:47
Washington Dulles (IAD)
Effective 2026-04-04 through 2026-04-25
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
Sun
-
Duration: 4:37, non-stop
Boeing 737-900 (739)
Direct Flights:
United Airlines UA688
08:35
Las Vegas Harry Reid (LAS) 3

15:55
Washington Dulles (IAD)
Effective 2026-05-02 through 2026-05-16
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
Sun
-
Duration: 4:20, non-stop
Boeing 737 MAX 9 (7M9)
Direct Flights:
United Airlines UA688
08:35
Las Vegas Harry Reid (LAS) 3

15:55
Washington Dulles (IAD)
Effective 2026-08-22 through 2026-09-05
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
Sun
-
Duration: 4:20, non-stop
Boeing 737 MAX 9 (7M9)
Direct Flights:
United Airlines UA688
08:40
Los Angeles (LAX) 7

16:22
Washington Dulles (IAD)
Valid until 2026-01-05
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 4:42, non-stop
Boeing 787-9 (789)
Direct Flights:
United Airlines UA688
10:05
Salt Lake City (SLC)

15:59
Washington Dulles (IAD)
Operates only on 2026-01-06
Mon
-
Tue
Wed
-
Thu
-
Fri
-
Sat
-
Sun
-
Duration: 3:54, non-stop
Boeing 737-800 (738)
Direct Flights:
United Airlines UA688
10:05
Salt Lake City (SLC)

15:59
Washington Dulles (IAD)
Effective 2026-01-07 through 2026-02-11
Mon
Tue
Wed
Thu
-
Fri
-
Sat
-
Sun
-
Duration: 3:54, non-stop
Boeing 737-700 (73G)
Direct Flights:
United Airlines UA688
10:05
Salt Lake City (SLC)

15:59
Washington Dulles (IAD)
Effective 2026-01-08 through 2026-02-08
Mon
-
Tue
-
Wed
-
Thu
Fri
Sat
Sun
Duration: 3:54, non-stop
Boeing 737 MAX 8 (7M8)
Direct Flights:
United Airlines UA688
17:10
Washington Dulles (IAD)

18:48
Boston Logan (BOS) B
Valid until 2026-01-04
Mon
Tue
Wed
Thu
-
Fri
-
Sat
-
Sun
Duration: 1:38, non-stop
Airbus A320 (320)
Direct Flights:
United Airlines UA688
17:10
Washington Dulles (IAD)

18:48
Boston Logan (BOS) B
Valid until 2026-01-05
Mon
Tue
-
Wed
-
Thu
Fri
Sat
-
Sun
-
Duration: 1:38, non-stop
Airbus A319 (319)
Direct Flights:
United Airlines UA688
17:10
Washington Dulles (IAD)

19:06
Boston Logan (BOS) B
Effective 2026-03-29 through 2026-05-20
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 1:56, non-stop
Boeing 737-900 (739)
Direct Flights:
United Airlines UA688
17:10
Washington Dulles (IAD)

18:44
Boston Logan (BOS) B
Effective from 2026-05-21
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 1:34, non-stop
Boeing 737-900 (739)
Direct Flights:
United Airlines UA688
17:20
Washington Dulles (IAD)

18:57
Boston Logan (BOS) B
Effective 2026-01-06 through 2026-02-11
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 1:37, non-stop
Boeing 737-900 (739)
Direct Flights:
United Airlines UA688
17:27
Washington Dulles (IAD)

19:08
Boston Logan (BOS) B
Effective 2026-02-12 through 2026-03-07
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 1:41, non-stop
Boeing 737-900 (739)
Direct Flights:
United Airlines UA688
17:55
Washington Dulles (IAD)

19:36
Boston Logan (BOS) B
Effective 2026-03-08 through 2026-03-28
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 1:41, non-stop
Boeing 737-900 (739)
Non-Direct Flights:
United Airlines UA688
06:00
San Francisco (SFO) 3

16:22
Washington Dulles (IAD)
Valid until 2026-01-05
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 7:22, 1-stop
Boeing 737-800 (738)
Non-Direct Flights:
United Airlines UA688
07:00
Las Vegas Harry Reid (LAS) 3

18:44
Boston Logan (BOS) B
Effective 2026-05-23 through 2026-06-21
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
Sun
Duration: 8:44, 1-stop
Boeing 737 MAX 9 (7M9)
Non-Direct Flights:
United Airlines UA688
08:10
Las Vegas Harry Reid (LAS) 3

19:06
Boston Logan (BOS) B
Effective 2026-04-04 through 2026-04-25
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
Sun
-
Duration: 7:56, 1-stop
Boeing 737-900 (739)
Non-Direct Flights:
United Airlines UA688
08:35
Las Vegas Harry Reid (LAS) 3

19:06
Boston Logan (BOS) B
Effective 2026-05-02 through 2026-05-16
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
Sun
-
Duration: 7:31, 1-stop
Boeing 737 MAX 9 (7M9)
Non-Direct Flights:
United Airlines UA688
08:35
Las Vegas Harry Reid (LAS) 3

18:44
Boston Logan (BOS) B
Effective 2026-08-22 through 2026-09-05
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
Sun
-
Duration: 7:09, 1-stop
Boeing 737 MAX 9 (7M9)
Non-Direct Flights:
United Airlines UA688
08:40
Los Angeles (LAX) 7

18:48
Boston Logan (BOS) B
Valid until 2026-01-05
Mon
Tue
Wed
Thu
Fri
Sat
-
Sun
Duration: 7:08, 1-stop
Boeing 787-9 (789)
Non-Direct Flights:
United Airlines UA688
10:05
Salt Lake City (SLC)

18:57
Boston Logan (BOS) B
Operates only on 2026-01-06
Mon
-
Tue
Wed
-
Thu
-
Fri
-
Sat
-
Sun
-
Duration: 6:52, 1-stop
Boeing 737-800 (738)
Non-Direct Flights:
United Airlines UA688
10:05
Salt Lake City (SLC)

18:57
Boston Logan (BOS) B
Effective 2026-01-07 through 2026-02-11
Mon
Tue
Wed
Thu
-
Fri
-
Sat
-
Sun
-
Duration: 6:52, 1-stop
Boeing 737-700 (73G)
Non-Direct Flights:
United Airlines UA688
10:05
Salt Lake City (SLC)

18:57
Boston Logan (BOS) B
Effective 2026-01-08 through 2026-02-08
Mon
-
Tue
-
Wed
-
Thu
Fri
Sat
Sun
Duration: 6:52, 1-stop
Boeing 737 MAX 8 (7M8)
Non-Direct Flights:
United Airlines UA688
06:00
San Francisco (SFO) 3

18:48
Boston Logan (BOS) B
Valid until 2026-01-05
Mon
Tue
Wed
Thu
Fri
Sat
-
Sun
Duration: 9:48, 2-stop
Boeing 737-800 (738)
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This flight number is listed as serving the following routes:
  • Las Vegas Harry Reid (LAS) - Boston Logan (BOS)
  • Las Vegas Harry Reid (LAS) - Washington Dulles (IAD)
  • Los Angeles (LAX) - Boston Logan (BOS)
  • Los Angeles (LAX) - Washington Dulles (IAD)
  • Salt Lake City (SLC) - Boston Logan (BOS)
  • Salt Lake City (SLC) - Washington Dulles (IAD)
  • San Francisco (SFO) - Boston Logan (BOS)
  • San Francisco (SFO) - Los Angeles (LAX)
  • San Francisco (SFO) - Washington Dulles (IAD)
  • Washington Dulles (IAD) - Boston Logan (BOS)
All United Airlines flights
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