Flights for the airplane with tail number N421UA These are not all the flights for this airplane, just the ones that have flown in and out of SFO since we've been counting. See all the airports this plane has visited for those flights or all the airplanes we've logged so far.

UA2220 (SFO-BOI)
This United Airlines flight between San Francisco International Airport and Boise Air Terminal, on September 11, 2023, was operated by another airline. It departed from gate F12. Passengers were flying aboard an Airbus A320-200 with tail number N421UA. See all the flights for UA2220.
UA1050 (LAX-SFO)
This United Airlines flight between Los Angeles International Airport and San Francisco International Airport, on September 11, 2023, was operated by another airline. It arrived at gate F12. Passengers were flying aboard an Airbus A320-200 with tail number N421UA. See all the flights for UA1050.
UA2123 (SFO-LAX)
This United Airlines flight between San Francisco International Airport and Los Angeles International Airport, on September 11, 2023, was operated by another airline. It departed from gate E5. Passengers were flying aboard an Airbus A320-200 with tail number N421UA. See all the flights for UA2123.
UA2416 (LAS-SFO)
This United Airlines flight between McCarran International Airport and San Francisco International Airport, on September 10, 2023, was operated by another airline. It arrived at gate E8. Passengers were flying aboard an Airbus A320-200 with tail number N421UA. See all the flights for UA2416.
UA1299 (SFO-LAS)
This United Airlines flight between San Francisco International Airport and McCarran International Airport, on September 10, 2023, was operated by another airline. It departed from gate F20. Passengers were flying aboard an Airbus A320-200 with tail number N421UA. See all the flights for UA1299.
UA1236 (EUG-SFO)
This United Airlines flight between Eugene Airport-Mahlon Sweet Field and San Francisco International Airport, on September 10, 2023, was operated by another airline. It arrived at gate F20. Passengers were flying aboard an Airbus A320-200 with tail number N421UA. See all the flights for UA1236.
UA1201 (SFO-PHX)
This United Airlines flight between San Francisco International Airport and Sky Harbor International Airport, on September 02, 2023, was operated by another airline. It departed from gate E5. Passengers were flying aboard an Airbus A320-200 with tail number N421UA. See all the flights for UA1201.
UA514 (EUG-SFO)
This United Airlines flight between Eugene Airport-Mahlon Sweet Field and San Francisco International Airport, on September 02, 2023, was operated by another airline. It arrived at gate E5. Passengers were flying aboard an Airbus A320-200 with tail number N421UA. See all the flights for UA514.
UA1734 (SAN-SFO)
This United Airlines flight between San Diego International Airport and San Francisco International Airport, on August 02, 2023, was operated by another airline. It arrived at gate F4. Passengers were flying aboard an Airbus A320-200 with tail number N421UA. See all the flights for UA1734.
UA2607 (PHX-SFO)
This United Airlines flight between Sky Harbor International Airport and San Francisco International Airport, on August 01, 2023, was operated by another airline. It arrived at gate F4. Passengers were flying aboard an Airbus A320-200 with tail number N421UA. See all the flights for UA2607.
UA1632 (PDX-SFO)
This United Airlines flight between Portland International Airport and San Francisco International Airport, on July 28, 2023, was operated by another airline. It arrived at gate E12. Passengers were flying aboard an Airbus A320-200 with tail number N421UA. See all the flights for UA1632.
UA2313 (SEA-SFO)
This United Airlines flight between Tacoma International Airport and San Francisco International Airport, on July 28, 2023, was operated by another airline. It arrived at gate E12. Passengers were flying aboard an Airbus A320-200 with tail number N421UA. See all the flights for UA2313.