UA3963United Airlines · SFO → SIN
live · 45m ago
Route confirmed United Airlines

UA3963 San FranciscoSFO SingaporeSIN

UA3963 by United Airlines flies from San Francisco (SFO) to Singapore (SIN).

Right nowNext departure tomorrow Operates daily
09:00

scheduled from SFO

The route today

live boards
SFOSan FranciscoModerate riskSFO delay board →
SINSingaporeOn-time likelySIN delay board →
SFO→SINevery carrier, schedules and on-time historyRoute intelligence →

Weather lens

Delay & cancellation outlook for this flight

Measured, 90-day sample
35%Chance of 15+ min delay
1.1%Chance of cancellation
+9 minTypical airport delay in this weather

Conditions at SFO and SIN are near their clear-air norm right now, so this reflects the route's recent baseline rather than a weather penalty. These figures come from both airports' records 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 →

Tomorrow at San Francisco

Forecast

Tue 10 Nov, local date

High22°Clikely 20°C to 24°C
Low13°Clikely 12°C to 15°C

Forecast: GateWeather · incl. data from ECMWF (CC BY 4.0, modified) · Expected values for tomorrow from a forecast model, kept apart from today's measured figures.

Tomorrow at Singapore

Forecast

Wed 11 Nov, local date

High31°Clikely 29°C to 32°C
Low25°Clikely 24°C to 26°C
  • 67% chance of thunder
  • 94% chance of rain

Forecast: GateWeather · incl. data from ECMWF (CC BY 4.0, modified) · Expected values for tomorrow from a forecast model, kept apart from today's measured figures.

When it flies

scheduled departures
061422
M
T
W
T
F
S
S

Each mark is a scheduled departure at its origin-local time. Today is highlighted.

Other San Francisco to Singapore flights today

same route · United Airlines
UA29departs 10:40
UA1departs 22:40

If UA3963 is cancelled, these are the other United Airlines nonstop flights from San Francisco to Singapore on the same day, with scheduled departure times in SFO local time. Most flights that show a delay still operate. Rebooking usually helps only when that delay is very large. Every airline on this route →

How UA3963 actually runs

Pro Flight Search has tracked every published board update for UA3963 across the SFO and SIN boards: schedule changes, gate pushes and actual clocks. Combined risk score: 50.0/100. Based on airport operations, weather, and cached board history at SFO and SIN.

The verdict above is that record speaking, so it reflects how UA3963 operates rather than what the timetable promises. Numbers refresh as new flights operate.

Planning around UA3963? Will a delayed flight be cancelled? · Do planes make up time in the air? · How we measure

Cite this data

Journalists, bloggers, and researchers may cite this page with attribution and a link to Pro Flight Search.

Suggested citation

Pro Flight Search: UA3963 San Francisco to Singapore on-time performance, measured from the SFO and SIN airport boards.

Canonical URL
https://proflightsearch.com/flight/UA3963
How we measure this →