UA900 LondonLHR · 10:35 San FranciscoSFO · 13:35
UA900 by United Airlines flies from London (LHR) to San Francisco (SFO) for the Tue, Sep 8 departure.
estimated arrival at SFO · local time · ~7h 38m from now
board checked 2m ago · checking again in 45s
Board estimate · gate and arrival times. Off blocks 11:09 · typical taxi-out at LHR ≈ 9.6 min. No receiver coverage over open ocean.
Where the minutes go
last 5 operations · gate push → arrivalThe bar is how late it left the gate; the ring is where it actually arrived. Board clocks, not estimates.
The last 30 days
arrival outcome per operationmedian arrival +2 min · 0 cancelled · 5 operations tracked
The route today
live boardsWeather lens
Delay & cancellation outlook for this flight
Measured, 90-day sampleConditions at LHR and SFO are near their clear-air norm right now, so this reflects the route's recent baseline rather than a weather penalty. For this route and airline, under conditions like today's, over the last 90 days.
Pro Flight Search tracking, 90 days · the weather × delay correlation study → · live weather risk by airport →
When it flies
scheduled departuresEach mark is a scheduled departure at its origin-local time. Today is highlighted.
Other London to San Francisco flights today
same route · United AirlinesIf UA900 is cancelled, these are the other United Airlines nonstop flights from London to San Francisco on the same day, with scheduled departure times in LHR local time. Most flights posting a delay still operate — rebooking usually only beats a very large posted delay. Every airline on this route →
How UA900 actually runs
Pro Flight Search has tracked every published board update for UA900 across the LHR and SFO boards: schedule changes, gate pushes and actual clocks. Usually lands ~15 min late. Based on 4 confirmed landings · 3/4 within 15 min of schedule.
The verdict above is that record speaking, so it reflects how UA900 operates rather than what the timetable promises. Numbers refresh as new flights operate.
How this operation is measured
Board log
scheduled → actual, per operationBoard clocks recorded as LHR and SFO published them.
Planning around UA900? Will a delayed flight be cancelled? · Do planes make up time in the air? · How we measure
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Pro Flight Search — UA900 London to San Francisco on-time performance, measured from the LHR and SFO airport boards.
https://proflightsearch.com/flight/UA900
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