United Airlines flight UA 721: Multiple routes

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Select flight date:
FLIGHT SCHEDULE
Direct Flights:
Sat,Sun 08:45 Chicago O'Hare (ORD) 1 12:12 Boston Logan (BOS) B
UA 721 Non-stop Boeing 737 MAX 9 (7M9) 2:27 Effective 2025-08-23 through 2025-08-31
Mon-Fri 09:15 Chicago O'Hare (ORD) 1 12:50 Boston Logan (BOS) B
UA 721 Non-stop Boeing 737 MAX 9 (7M9) 2:35 Effective 2025-05-22 through 2025-05-30
Mon-Fri,Sun 09:15 Chicago O'Hare (ORD) 1 12:50 Boston Logan (BOS) B
UA 721 Non-stop Boeing 737 MAX 9 (7M9) 2:35 Effective 2025-06-01 through 2025-08-18
Mon-Fri,Sun 09:20 Chicago O'Hare (ORD) 1 12:48 Boston Logan (BOS) B
UA 721 Non-stop Boeing 737 MAX 9 (7M9) 2:28 Valid until 2025-05-21
Sat 09:35 George Bush, Houston (IAH) C 10:41 San Antonio (SAT) B
UA 721 Non-stop Boeing 737-900 (739) 1:06 Operates only on 2025-07-05
Sat 09:50 George Bush, Houston (IAH) C 10:56 San Antonio (SAT) B
UA 721 Non-stop Airbus A320 (320) 1:06 Operates only on 2025-06-28
Sat 09:50 George Bush, Houston (IAH) C 10:56 San Antonio (SAT) B
UA 721 Non-stop Airbus A320 (320) 1:06 Effective 2025-07-12 through 2025-07-26
Daily 14:16 Boston Logan (BOS) B 16:04 Dulles, Washington (IAD)
UA 721 Non-stop Boeing 737 MAX 9 (7M9) 1:48 Effective 2025-08-19 through 2025-09-24
Daily 14:16 Boston Logan (BOS) B 16:04 Dulles, Washington (IAD)
UA 721 Non-stop Boeing 737-900 (739) 1:48 Effective from 2025-10-26
Daily 14:34 Boston Logan (BOS) B 16:18 Dulles, Washington (IAD)
UA 721 Non-stop Boeing 737-900 (739) 1:44 Effective 2025-05-22 through 2025-06-25
Sat 14:39 Jackson (JAC) 16:04 San Francisco (SFO) 3
UA 721 Non-stop Airbus A319 (319) 2:25 Effective 2025-08-02 through 2025-08-16
Daily 14:40 Boston Logan (BOS) B 16:23 Dulles, Washington (IAD)
UA 721 Non-stop Boeing 737 MAX 9 (7M9) 1:43 Effective 2025-09-25 through 2025-10-25
Daily 14:49 Boston Logan (BOS) B 16:30 Dulles, Washington (IAD)
UA 721 Non-stop Boeing 737-900 (739) 1:41 Valid until 2025-05-21
Non-Direct Flights:
Sat,Sun 08:45 Chicago O'Hare (ORD) 1 16:04 Dulles, Washington (IAD)
UA 721 1-stop Boeing 737 MAX 9 (7M9) 6:19 Effective 2025-08-23 through 2025-08-31
Mon-Fri 09:15 Chicago O'Hare (ORD) 1 16:18 Dulles, Washington (IAD)
UA 721 1-stop Boeing 737 MAX 9 (7M9) 6:03 Effective 2025-05-22 through 2025-05-30
Mon-Fri,Sun 09:15 Chicago O'Hare (ORD) 1 16:18 Dulles, Washington (IAD)
UA 721 1-stop Boeing 737 MAX 9 (7M9) 6:03 Effective 2025-06-01 through 2025-06-25
Mon-Fri,Sun 09:20 Chicago O'Hare (ORD) 1 16:30 Dulles, Washington (IAD)
UA 721 1-stop Boeing 737 MAX 9 (7M9) 6:10 Valid until 2025-05-21
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This flight number is listed as serving the following routes:


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United Airlines flight UA 721: Multiple routes
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Select flight date:
FLIGHT SCHEDULE
Direct Flights:
United Airlines UA721
08:45
Chicago O'Hare (ORD) 1

12:12
Boston Logan (BOS) B
Effective 2025-08-23 through 2025-08-31
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
Sun
Duration: 2:27, non-stop
Boeing 737 MAX 9 (7M9)
United Airlines UA721
09:15
Chicago O'Hare (ORD) 1

12:50
Boston Logan (BOS) B
Effective 2025-05-22 through 2025-05-30
Mon
Tue
Wed
Thu
Fri
Sat
-
Sun
-
Duration: 2:35, non-stop
Boeing 737 MAX 9 (7M9)
United Airlines UA721
09:15
Chicago O'Hare (ORD) 1

12:50
Boston Logan (BOS) B
Effective 2025-06-01 through 2025-08-18
Mon
Tue
Wed
Thu
Fri
Sat
-
Sun
Duration: 2:35, non-stop
Boeing 737 MAX 9 (7M9)
United Airlines UA721
09:20
Chicago O'Hare (ORD) 1

12:48
Boston Logan (BOS) B
Valid until 2025-05-21
Mon
Tue
Wed
Thu
Fri
Sat
-
Sun
Duration: 2:28, non-stop
Boeing 737 MAX 9 (7M9)
United Airlines UA721
09:35
George Bush, Houston (IAH) C

10:41
San Antonio (SAT) B
Operates only on 2025-07-05
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
Sun
-
Duration: 1:06, non-stop
Boeing 737-900 (739)
United Airlines UA721
09:50
George Bush, Houston (IAH) C

10:56
San Antonio (SAT) B
Operates only on 2025-06-28
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
Sun
-
Duration: 1:06, non-stop
Airbus A320 (320)
United Airlines UA721
09:50
George Bush, Houston (IAH) C

10:56
San Antonio (SAT) B
Effective 2025-07-12 through 2025-07-26
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
Sun
-
Duration: 1:06, non-stop
Airbus A320 (320)
United Airlines UA721
14:16
Boston Logan (BOS) B

16:04
Dulles, Washington (IAD)
Effective 2025-08-19 through 2025-09-24
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 1:48, non-stop
Boeing 737 MAX 9 (7M9)
United Airlines UA721
14:16
Boston Logan (BOS) B

16:04
Dulles, Washington (IAD)
Effective from 2025-10-26
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 1:48, non-stop
Boeing 737-900 (739)
United Airlines UA721
14:34
Boston Logan (BOS) B

16:18
Dulles, Washington (IAD)
Effective 2025-05-22 through 2025-06-25
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 1:44, non-stop
Boeing 737-900 (739)
United Airlines UA721
14:39
Jackson (JAC)

16:04
San Francisco (SFO) 3
Effective 2025-08-02 through 2025-08-16
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
Sun
-
Duration: 2:25, non-stop
Airbus A319 (319)
United Airlines UA721
14:40
Boston Logan (BOS) B

16:23
Dulles, Washington (IAD)
Effective 2025-09-25 through 2025-10-25
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 1:43, non-stop
Boeing 737 MAX 9 (7M9)
United Airlines UA721
14:49
Boston Logan (BOS) B

16:30
Dulles, Washington (IAD)
Valid until 2025-05-21
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 1:41, non-stop
Boeing 737-900 (739)
Non-Direct Flights:
United Airlines UA721
08:45
Chicago O'Hare (ORD) 1

16:04
Dulles, Washington (IAD)
Effective 2025-08-23 through 2025-08-31
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
Sun
Duration: 6:19, 1-stop
Boeing 737 MAX 9 (7M9)
United Airlines UA721
09:15
Chicago O'Hare (ORD) 1

16:18
Dulles, Washington (IAD)
Effective 2025-05-22 through 2025-05-30
Mon
Tue
Wed
Thu
Fri
Sat
-
Sun
-
Duration: 6:03, 1-stop
Boeing 737 MAX 9 (7M9)
United Airlines UA721
09:15
Chicago O'Hare (ORD) 1

16:18
Dulles, Washington (IAD)
Effective 2025-06-01 through 2025-06-25
Mon
Tue
Wed
Thu
Fri
Sat
-
Sun
Duration: 6:03, 1-stop
Boeing 737 MAX 9 (7M9)
United Airlines UA721
09:20
Chicago O'Hare (ORD) 1

16:30
Dulles, Washington (IAD)
Valid until 2025-05-21
Mon
Tue
Wed
Thu
Fri
Sat
-
Sun
Duration: 6:10, 1-stop
Boeing 737 MAX 9 (7M9)
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This flight number is listed as serving the following routes:
  • Boston Logan (BOS) - Dulles, Washington (IAD)
  • Chicago O'Hare (ORD) - Boston Logan (BOS)
  • Chicago O'Hare (ORD) - Dulles, Washington (IAD)
  • George Bush, Houston (IAH) - San Antonio (SAT)
  • Jackson (JAC) - San Francisco (SFO)
All United Airlines flights
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