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 (DEN-SFO)
This United Airlines flight between Denver International Airport and San Francisco International Airport, on January 09, 2023, was operated by another airline. It arrived at gate F17. Passengers were flying aboard a Boeing 757-300 with tail number N57864. See all the flights for UA521.
UA521 (DEN-SFO)
This United Airlines flight between Denver International Airport and San Francisco International Airport, on January 08, 2023, was operated by another airline. It arrived at gate G8. Passengers were flying aboard a Boeing 777-200 with tail number N210UA. See all the flights for UA521.
UA521 (DEN-SFO)
This United Airlines flight between Denver International Airport and San Francisco International Airport, on January 07, 2023, was operated by another airline. It arrived at gate F20. Passengers were flying aboard a Boeing 757-300 with tail number N57868. See all the flights for UA521.
UA521 (DEN-SFO)
This United Airlines flight between Denver International Airport and San Francisco International Airport, on January 06, 2023, was operated by another airline. It arrived at gate F12. Passengers were flying aboard a Boeing 757-300 with tail number N57864. See all the flights for UA521.
UA521 (DEN-SFO)
This United Airlines flight between Denver International Airport and San Francisco International Airport, on January 05, 2023, was operated by another airline. It arrived at gate F12. Passengers were flying aboard a Boeing 757-300 with tail number N57870. See all the flights for UA521.
UA521 (DEN-SFO)
This United Airlines flight between Denver International Airport and San Francisco International Airport, on January 04, 2023, was operated by another airline. It arrived at gate F14. Passengers were flying aboard a Boeing 757-300 with tail number N75851. 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 September 30, 2022, was operated by another airline. It arrived at gate F16. Passengers were flying aboard a Boeing 757-200 with tail number N17105. 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 September 29, 2022, was operated by another airline. It arrived at gate F14. Passengers were flying aboard a Boeing 757-200 with tail number N17105. 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 September 28, 2022, was operated by another airline. It arrived at gate F14. Passengers were flying aboard a Boeing 757-200 with tail number N17133. 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 September 27, 2022, was operated by another airline. It arrived at gate F14. Passengers were flying aboard a Boeing 757-200 with tail number N41135. See all the flights for UA521.