Flights for UA521 These are not all the flights that UA521 has taken, just some of them that have flown in or out of SFO

UA521 (JFK-SFO)
This United Airlines flight between John F Kennedy International Airport and San Francisco International Airport, on July 24, 2022, was operated by another airline. It arrived at gate F16. Passengers were flying aboard a Boeing 757-200 with tail number N17133. See all the flights for UA521.
UA521 (SFO-PDX)
This United Airlines flight between San Francisco International Airport and Portland International Airport, on July 23, 2022, was operated by another airline. It departed from gate F3. Passengers were flying aboard a Boeing 737-700 with tail number N73275. See all the flights for UA521.
UA521 (JFK-SFO)
This United Airlines flight between John F Kennedy International Airport and San Francisco International Airport, on July 23, 2022, was operated by another airline. It arrived at gate F12. Passengers were flying aboard a Boeing 757-200 with tail number N67134. See all the flights for UA521.
UA521 (SFO-PDX)
This United Airlines flight between San Francisco International Airport and Portland International Airport, on July 22, 2022, was operated by another airline. It departed from gate F1. Passengers were flying aboard an Airbus A320-200 with tail number N452UA. See all the flights for UA521.
UA521 (JFK-SFO)
This United Airlines flight between John F Kennedy International Airport and San Francisco International Airport, on July 22, 2022, was operated by another airline. It arrived at gate F11. Passengers were flying aboard a Boeing 757-200 with tail number N14115. See all the flights for UA521.
UA521 (SFO-PDX)
This United Airlines flight between San Francisco International Airport and Portland International Airport, on July 21, 2022, was operated by another airline. It departed from gate F4. Passengers were flying aboard an Airbus A320-200 with tail number N423UA. See all the flights for UA521.
UA521 (JFK-SFO)
This United Airlines flight between John F Kennedy International Airport and San Francisco International Airport, on July 21, 2022, was operated by another airline. It arrived at gate F17. Passengers were flying aboard a Boeing 757-200 with tail number N34131. See all the flights for UA521.
UA521 (SFO-PDX)
This United Airlines flight between San Francisco International Airport and Portland International Airport, on July 20, 2022, was operated by another airline. It departed from gate F1. Passengers were flying aboard an Airbus A320-200 with tail number N427UA. See all the flights for UA521.
UA521 (JFK-SFO)
This United Airlines flight between John F Kennedy International Airport and San Francisco International Airport, on July 20, 2022, was operated by another airline. It arrived at gate F20. Passengers were flying aboard a Boeing 757-200 with tail number N17104. See all the flights for UA521.
UA521 (SFO-PDX)
This United Airlines flight between San Francisco International Airport and Portland International Airport, on July 19, 2022, was operated by another airline. It departed from gate E3. Passengers were flying aboard an Airbus A320-200 with tail number N471UA. See all the flights for UA521.
UA521 (JFK-SFO)
This United Airlines flight between John F Kennedy International Airport and San Francisco International Airport, on July 19, 2022, was operated by another airline. It arrived at gate F19. Passengers were flying aboard a Boeing 757-200 with tail number N17104. See all the flights for UA521.
UA521 (SFO-PDX)
This United Airlines flight between San Francisco International Airport and Portland International Airport, on July 18, 2022, was operated by another airline. It departed from gate F1. Passengers were flying aboard an Airbus A320-200 with tail number N452UA. See all the flights for UA521.