Ahead 120 min

United Airlines UA3777·BFI → SFO·21 May 2026

BFI

Boeing Field/King County International Airport

Seattle, United States

UA3777

2026-05-21

SFO

San Francisco International

San Francisco, United States

Departs

17:45

20 May 2026 · America/Los_Angeles

Terminal 3

Arrives

19:45

20 May 2026 · America/Los_Angeles

Times

Scheduled departure

17:45

20 May 2026 (America/Los_Angeles)

UTC: Thu, 21 May 2026 00:45:00 GMT

Scheduled arrival

19:45

20 May 2026 (America/Los_Angeles)

UTC: Thu, 21 May 2026 02:45:00 GMT

Estimated departure

17:45

20 May 2026 (America/Los_Angeles)

UTC: Thu, 21 May 2026 00:45:00 GMT

Estimated arrival

Not available

Actual departure

Not available

Actual arrival

Not available

Details

Departure terminal / gate

Terminal: 3Gate: —

Arrival terminal / gate / belt

Terminal: —Gate: —Belt: —

Aircraft

Registration: N57409

Type: ICAO B39M / IATA —

ICAO24: A75FBF

View aircraft page →

Codeshare

Flight: —

Airline: —

Departure airport

BFI — Boeing Field/King County International Airport

Seattle, United States

View airport page →

Arrival airport

SFO — San Francisco International

San Francisco, United States

View airport page →

Board history

DEPARTURE @ BFITerm 3Scheduled

Event timeline

Status
Event: Thu, 21 May 2026 00:45:00 GMT · Recorded: Wed, 20 May 2026 18:21:04 GMT

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