UA643 San FranciscoSFO · 10:17 HoustonIAH · 12:03
UA643 by United Airlines flies from San Francisco (SFO) to Houston (IAH) for the Sat, Oct 17 departure.
Same number through SFO → SNA → IAH
departs SFO · on schedule
board checked 54m ago · checking again in 45s
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 operation0 cancelled · 5 operations tracked
The route today
live boardsWeather lens
Delay & cancellation outlook for this flight
Measured, 90-day sampleConditions at SFO and IAH 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 San Francisco to Houston flights today
same route · United AirlinesIf UA643 is cancelled, these are the other United Airlines nonstop flights from San Francisco to Houston on the same day, with scheduled departure times in SFO local time. Most flights posting a delay still operate — rebooking usually only beats a very large posted delay. Every airline on this route →
How UA643 actually runs
Pro Flight Search has tracked every published board update for UA643 across the SFO and IAH boards: schedule changes, gate pushes and actual clocks. Usually lands ~201 min late. Based on 5 confirmed landings · 2/5 within 15 min of schedule.
The verdict above is that record speaking, so it reflects how UA643 operates rather than what the timetable promises. Numbers refresh as new flights operate.
How this operation is measured
Board log
scheduled → actual, per operationAircraft
Recent tails: N47370, N17289, N57286, N16234.
Board clocks recorded as SFO and IAH published them.
Planning around UA643? Will a delayed flight be cancelled? · Do planes make up time in the air? · How we measure
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Pro Flight Search — UA643 San Francisco to Houston on-time performance, measured from the SFO and IAH airport boards.
https://proflightsearch.com/flight/UA643
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