United Airlines
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UA 521:
Multiple routes
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Direktflüge:
United Airlines UA521
Effective 2026-03-29 through 2026-04-29
Mo
Di
Mi
Do
Fr
Sa
So
Duration: 2:15, non-stop
Airbus A319 (319)
Airbus A319 (319)
Direktflüge:
United Airlines UA521
Effective 2026-04-30 through 2026-05-20
Mo
Di
Mi
Do
Fr
Sa
So
Duration: 2:15, non-stop
Boeing 737-700 (73G)
Boeing 737-700 (73G)
Direktflüge:
United Airlines UA521
Effective from 2026-05-21
Mo
Di
Mi
Do
Fr
Sa
So
Duration: 2:15, non-stop
Airbus A319 (319)
Airbus A319 (319)
Direktflüge:
United Airlines UA521
Effective 2026-03-05 through 2026-03-27
Mo
-
-
Di
-
-
Mi
-
-
Do
Fr
Sa
-
-
So
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-
Duration: 2:28, non-stop
Airbus A320 (320)
Airbus A320 (320)
Direktflüge:
United Airlines UA521
Effective 2026-03-07 through 2026-03-28
Mo
-
-
Di
-
-
Mi
-
-
Do
-
-
Fr
-
-
Sa
So
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-
Duration: 2:28, non-stop
Boeing 737-700 (73G)
Boeing 737-700 (73G)
Direktflüge:
United Airlines UA521
Effective 2026-03-08 through 2026-03-25
Mo
Di
Mi
Do
-
-
Fr
-
-
Sa
-
-
So
Duration: 2:28, non-stop
Airbus A319 (319)
Airbus A319 (319)
Direktflüge:
United Airlines UA521
Effective 2026-02-12 through 2026-03-04
Mo
Di
Mi
Do
Fr
Sa
So
Duration: 2:30, non-stop
Boeing 737-800 (738)
Boeing 737-800 (738)
Direktflüge:
United Airlines UA521
Effective 2026-01-10 through 2026-02-07
Mo
-
-
Di
-
-
Mi
-
-
Do
-
-
Fr
-
-
Sa
So
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-
Duration: 2:28, non-stop
Airbus A320 (320)
Airbus A320 (320)
Direktflüge:
United Airlines UA521
Effective 2026-01-07 through 2026-02-11
Mo
Di
-
-
Mi
Do
Fr
Sa
-
-
So
-
-
Duration: 1:31, non-stop
Boeing 737-700 (73G)
Boeing 737-700 (73G)
Direktflüge:
United Airlines UA521
Effective 2026-01-11 through 2026-02-08
Mo
-
-
Di
-
-
Mi
-
-
Do
-
-
Fr
-
-
Sa
-
-
So
Duration: 1:31, non-stop
Boeing 737-700 (73G)
Boeing 737-700 (73G)
Direktflüge:
United Airlines UA521
Effective 2026-01-06 through 2026-02-10
Mo
-
-
Di
Mi
-
-
Do
-
-
Fr
-
-
Sa
-
-
So
-
-
Duration: 1:30, non-stop
Boeing 737-700 (73G)
Boeing 737-700 (73G)
Direktflüge:
United Airlines UA521
Effective 2026-03-29 through 2026-04-29
Mo
Di
Mi
Do
Fr
Sa
So
Duration: 3:57, non-stop
Boeing 737-900 (739)
Boeing 737-900 (739)
Direktflüge:
United Airlines UA521
Effective 2026-04-30 through 2026-05-20
Mo
Di
Mi
Do
Fr
Sa
So
Duration: 3:45, non-stop
Boeing 737 MAX 8 (7M8)
Boeing 737 MAX 8 (7M8)
Direktflüge:
United Airlines UA521
Effective from 2026-05-21
Mo
Di
Mi
Do
Fr
Sa
So
Duration: 3:45, non-stop
Boeing 737-800 (738)
Boeing 737-800 (738)
Direktflüge:
United Airlines UA521
Effective 2026-03-05 through 2026-03-27
Mo
Di
-
-
Mi
Do
Fr
Sa
-
-
So
Duration: 3:48, non-stop
Boeing 737 MAX 8 (7M8)
Boeing 737 MAX 8 (7M8)
Direktflüge:
United Airlines UA521
Effective 2026-03-07 through 2026-03-28
Mo
-
-
Di
-
-
Mi
-
-
Do
-
-
Fr
-
-
Sa
So
-
-
Duration: 3:48, non-stop
Boeing 737-800 (738)
Boeing 737-800 (738)
Direktflüge:
United Airlines UA521
Effective 2026-02-12 through 2026-03-04
Mo
Di
Mi
Do
Fr
Sa
-
-
So
-
-
Duration: 3:29, non-stop
Boeing 737-800 (738)
Boeing 737-800 (738)
Direktflüge:
United Airlines UA521
Valid until 2026-01-04
Mo
Di
Mi
Do
Fr
Sa
-
-
So
Duration: 3:17, non-stop
Boeing 737 MAX 8 (7M8)
Boeing 737 MAX 8 (7M8)
Direktflüge:
United Airlines UA521
Operates only on 2026-01-05
Mo
Di
-
-
Mi
-
-
Do
-
-
Fr
-
-
Sa
-
-
So
-
-
Duration: 3:17, non-stop
Boeing 737-900 (739)
Boeing 737-900 (739)
Direktflüge:
United Airlines UA521
Valid until 2026-01-03
Mo
-
-
Di
-
-
Mi
-
-
Do
-
-
Fr
-
-
Sa
So
-
-
Duration: 3:17, non-stop
Boeing 737-900 (739)
Boeing 737-900 (739)
Indirekte Flüge:
United Airlines UA521
Effective 2026-03-29 through 2026-04-29
Mo
Di
Mi
Do
Fr
Sa
So
Duration: 7:47, 1-stop
Airbus A319 (319)
Airbus A319 (319)
Indirekte Flüge:
United Airlines UA521
Effective 2026-04-30 through 2026-05-20
Mo
Di
Mi
Do
Fr
Sa
So
Duration: 7:35, 1-stop
Boeing 737-700 (73G)
Boeing 737-700 (73G)
Indirekte Flüge:
United Airlines UA521
Effective from 2026-05-21
Mo
Di
Mi
Do
Fr
Sa
So
Duration: 7:35, 1-stop
Airbus A319 (319)
Airbus A319 (319)
Indirekte Flüge:
United Airlines UA521
Effective 2026-03-05 through 2026-03-27
Mo
-
-
Di
-
-
Mi
-
-
Do
Fr
Sa
-
-
So
-
-
Duration: 7:33, 1-stop
Airbus A320 (320)
Airbus A320 (320)
Indirekte Flüge:
United Airlines UA521
Effective 2026-03-07 through 2026-03-28
Mo
-
-
Di
-
-
Mi
-
-
Do
-
-
Fr
-
-
Sa
So
-
-
Duration: 7:33, 1-stop
Boeing 737-700 (73G)
Boeing 737-700 (73G)
Indirekte Flüge:
United Airlines UA521
Effective 2026-03-08 through 2026-03-25
Mo
Di
-
-
Mi
Do
-
-
Fr
-
-
Sa
-
-
So
Duration: 7:33, 1-stop
Airbus A319 (319)
Airbus A319 (319)
Indirekte Flüge:
United Airlines UA521
Effective 2026-02-12 through 2026-03-04
Mo
Di
Mi
Do
Fr
Sa
-
-
So
-
-
Duration: 7:10, 1-stop
Boeing 737-800 (738)
Boeing 737-800 (738)
This flight number is listed as serving the following routes:
- Atlanta (ATL) - Boston Logan (BOS)
- Atlanta (ATL) - Houston George Bush (IAH)
- Atlanta (ATL) - New York LaGuardia (LGA)
- Boston Logan (BOS) - Newark Liberty, New York (EWR)
- Houston George Bush (IAH) - Boston Logan (BOS)
- Houston George Bush (IAH) - New York LaGuardia (LGA)
- Newark Liberty, New York (EWR) - Fort Lauderdale (FLL)
- Saint Louis (STL) - Houston George Bush (IAH)