United Airlines flight UA 521: Multiple routes

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Select flight date:
FLIGHT SCHEDULE
Direct Flights:
Mon,Tue,Fri,Sat 06:05 Cleveland Hopkins (CLE) 08:17 George Bush, Houston (IAH) C
UA 521 Non-stop Boeing 737-700 (73G) 3:12 Effective 2025-05-02 through 2025-05-20
Wed,Sun 06:05 Cleveland Hopkins (CLE) 08:17 George Bush, Houston (IAH) C
UA 521 Non-stop Boeing 737-800 (738) 3:12 Effective 2025-05-04 through 2025-05-21
Thu 06:23 Cleveland Hopkins (CLE) 08:35 George Bush, Houston (IAH) C
UA 521 Non-stop Boeing 737-700 (73G) 3:12 Valid until 2025-05-15
Thu 07:00 Nashville (BNA) 09:43 San Francisco (SFO) 3
UA 521 Non-stop Airbus A320 (320) 4:43 Operates only on 2025-06-26
Mon,Tue,Thu-Sat 07:00 Nashville (BNA) 09:45 San Francisco (SFO) 3
UA 521 Non-stop Airbus A319 (319) 4:45 Effective 2025-06-27 through 2025-07-31
Wed,Sun 07:00 Nashville (BNA) 09:45 San Francisco (SFO) 3
UA 521 Non-stop Boeing 737-800 (738) 4:45 Effective 2025-06-29 through 2025-07-30
Sat,Sun 07:00 Jackson (JAC) 11:15 George Bush, Houston (IAH) C
UA 521 Non-stop Boeing 737-700 (73G) 3:15 Effective 2025-08-02 through 2025-08-17
Daily 09:30 Boston Logan (BOS) B 11:10 Dulles, Washington (IAD)
UA 521 Non-stop Boeing 737-800 (738) 1:40 Effective 2025-05-22 through 2025-06-25
Mon,Wed-Fri 16:32 Boston Logan (BOS) B 17:59 Newark Liberty, New York (EWR) C
UA 521 Non-stop Airbus A319 (319) 1:27 Effective 2025-08-01 through 2025-08-18
Tue 16:33 Boston Logan (BOS) B 18:00 Newark Liberty, New York (EWR) C
UA 521 Non-stop Airbus A319 (319) 1:27 Effective 2025-08-05 through 2025-08-12
Daily 18:30 Boston Logan (BOS) B 20:00 Newark Liberty, New York (EWR) C
UA 521 Non-stop Boeing 737-900 (739) 1:30 Effective 2025-08-19 through 2025-09-24
Daily 18:30 Boston Logan (BOS) B 20:00 Newark Liberty, New York (EWR) C
UA 521 Non-stop Boeing 737-700 (73G) 1:30 Effective 2025-10-26 through 2025-12-17
Daily 18:30 Boston Logan (BOS) B 20:00 Newark Liberty, New York (EWR) C
UA 521 Non-stop Boeing 737-700 (73G) 1:30 Effective from 2026-01-06
Daily 18:55 Boston Logan (BOS) B 20:29 Newark Liberty, New York (EWR) C
UA 521 Non-stop Airbus A319 (319) 1:34 Effective 2025-09-25 through 2025-10-25
Daily 20:20 Denver (DEN) 23:59 New Orleans (MSY)
UA 521 Non-stop Boeing 737-800 (738) 2:39 Effective 2025-12-18 through 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 521: Multiple routes
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Select flight date:
FLIGHT SCHEDULE
Direct Flights:
United Airlines UA521
06:05
Cleveland Hopkins (CLE)

08:17
George Bush, Houston (IAH) C
Effective 2025-05-02 through 2025-05-20
Mon
Tue
Wed
-
Thu
-
Fri
Sat
Sun
-
Duration: 3:12, non-stop
Boeing 737-700 (73G)
United Airlines UA521
06:05
Cleveland Hopkins (CLE)

08:17
George Bush, Houston (IAH) C
Effective 2025-05-04 through 2025-05-21
Mon
-
Tue
-
Wed
Thu
-
Fri
-
Sat
-
Sun
Duration: 3:12, non-stop
Boeing 737-800 (738)
United Airlines UA521
06:23
Cleveland Hopkins (CLE)

08:35
George Bush, Houston (IAH) C
Valid until 2025-05-15
Mon
-
Tue
-
Wed
-
Thu
Fri
-
Sat
-
Sun
-
Duration: 3:12, non-stop
Boeing 737-700 (73G)
United Airlines UA521
07:00
Nashville (BNA)

09:43
San Francisco (SFO) 3
Operates only on 2025-06-26
Mon
-
Tue
-
Wed
-
Thu
Fri
-
Sat
-
Sun
-
Duration: 4:43, non-stop
Airbus A320 (320)
United Airlines UA521
07:00
Nashville (BNA)

09:45
San Francisco (SFO) 3
Effective 2025-06-27 through 2025-07-31
Mon
Tue
Wed
-
Thu
Fri
Sat
Sun
-
Duration: 4:45, non-stop
Airbus A319 (319)
United Airlines UA521
07:00
Nashville (BNA)

09:45
San Francisco (SFO) 3
Effective 2025-06-29 through 2025-07-30
Mon
-
Tue
-
Wed
Thu
-
Fri
-
Sat
-
Sun
Duration: 4:45, non-stop
Boeing 737-800 (738)
United Airlines UA521
07:00
Jackson (JAC)

11:15
George Bush, Houston (IAH) C
Effective 2025-08-02 through 2025-08-17
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
Sun
Duration: 3:15, non-stop
Boeing 737-700 (73G)
United Airlines UA521
09:30
Boston Logan (BOS) B

11:10
Dulles, Washington (IAD)
Effective 2025-05-22 through 2025-06-25
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 1:40, non-stop
Boeing 737-800 (738)
United Airlines UA521
16:32
Boston Logan (BOS) B

17:59
Newark Liberty, New York (EWR) C
Effective 2025-08-01 through 2025-08-18
Mon
Tue
-
Wed
Thu
Fri
Sat
-
Sun
-
Duration: 1:27, non-stop
Airbus A319 (319)
United Airlines UA521
16:33
Boston Logan (BOS) B

18:00
Newark Liberty, New York (EWR) C
Effective 2025-08-05 through 2025-08-12
Mon
-
Tue
Wed
-
Thu
-
Fri
-
Sat
-
Sun
-
Duration: 1:27, non-stop
Airbus A319 (319)
United Airlines UA521
18:30
Boston Logan (BOS) B

20:00
Newark Liberty, New York (EWR) C
Effective 2025-08-19 through 2025-09-24
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 1:30, non-stop
Boeing 737-900 (739)
United Airlines UA521
18:30
Boston Logan (BOS) B

20:00
Newark Liberty, New York (EWR) C
Effective 2025-10-26 through 2025-12-17
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 1:30, non-stop
Boeing 737-700 (73G)
United Airlines UA521
18:30
Boston Logan (BOS) B

20:00
Newark Liberty, New York (EWR) C
Effective from 2026-01-06
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 1:30, non-stop
Boeing 737-700 (73G)
United Airlines UA521
18:55
Boston Logan (BOS) B

20:29
Newark Liberty, New York (EWR) C
Effective 2025-09-25 through 2025-10-25
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 1:34, non-stop
Airbus A319 (319)
United Airlines UA521
20:20
Denver (DEN)

23:59
New Orleans (MSY)
Effective 2025-12-18 through 2026-01-05
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 2:39, non-stop
Boeing 737-800 (738)
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Parallax here
This flight number is listed as serving the following routes:
  • Boston Logan (BOS) - Dulles, Washington (IAD)
  • Boston Logan (BOS) - Newark Liberty, New York (EWR)
  • Cleveland Hopkins (CLE) - George Bush, Houston (IAH)
  • Denver (DEN) - New Orleans (MSY)
  • Jackson (JAC) - George Bush, Houston (IAH)
  • Nashville (BNA) - San Francisco (SFO)
All United Airlines flights
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