SQ33Singapore AirlinesIn the air, 28 min late
Left SFO at 20:43, 28 min after its 20:15 slot.
Track SQ33 →
live
Direct flights from San Francisco (SFO) to Singapore (SIN): 28 nonstop departures observed each week across 2 airlines. 100% of the last 7 tracked flights arrived within 15 minutes of schedule. The median arrival is 43 minutes early. No cancellations were recorded across the 9 tracked flights. The nonstop covers 13,582 km, an estimated 17 hours 55 minutes in the air. Measured by Pro Flight Search from live flight boards at San Francisco and Singapore. Updated 5 November 2026 at 06:38 UTC.
Today, SFO → SIN
Wed 4 Nov · local times- 09:40 SQ31Singapore Airlines Left 09:50 +10 SIN est. 18:11In the air · sched 19:05
- 10:40 UA29United Airlines Est. 20:10Departure not confirmed by the board SIN est. 04:56 +521sched 20:15
- 20:15 SQ33Singapore Airlines Left 20:43 +28 ·
- 22:40 UA1United Airlines Departed Landed 07:41 −19
Checked SFO board 22:38 · SIN board 14:07
SFO
San Francisco
smooth · +0
SIN
Singapore
smooth · +0
13,582 km · ~17h 55m est.
Runs reliable · 2 airlines · 28x weekly · nonstop
100% on time
of the last 7 tracked SFO → SIN flights arrived within 15 minutes
Median arrival delay is −43 min. 0 of 9 tracked legs cancelled in the sample. Will a delayed flight be cancelled? →
Median arrival−43 minacross the last 7 arrivals
Flight time~17h 55mestimated from route distance
Weekly departures28x2 direct airlines on the leg
The week
scheduled departures · origin local time06121824
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Singapore AirlinesUnited Airlines
Each mark is a scheduled departure at its origin-local time, observed operating in the last 7 days. Today is highlighted.
Who flies it
observed on the boards · 7 daysHistory
operated legs · board outcomesActual board outcomes rather than schedules, paired departure and arrival per flight and day.
Full board history, day by day →
Airports right now
live boardsWeather lens
Conditions are tightest at SFO: a 37% chance of a 15+ minute delay. In this weather, the more delayed of the two airports is typically about +10 min. Both figures come from the two airports' delay records in similar weather. See live delays → · Weather risk by airport →
next sweep in 120s
How the San Francisco to Singapore route actually runs
Pro Flight Search records official board updates for nonstop SFO to SIN flights through the day: schedules, estimates, gate pushes and actual departures. The verdict above comes from operated flights, so it reflects what this route does rather than what the timetable promises.
Planning around a delay? Live airport delays · Weather delay risk map · 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: San Francisco (SFO) to Singapore (SIN) route reliability, measured from operated flights on official airport boards.
Canonical URL
How we measure this →
https://proflightsearch.com/search-flights/SFO-SIN
SFO to SIN questions
Is SFO–SIN running on time right now?
Smooth skies ahead. Both endpoints currently score the same, route health score 88/100. The airports section above carries the live status and delay window at both ends.
How long is the flight from SFO to SIN?
Great-circle distance is 13,582 km. With typical jet cruise speed plus taxi, climb and descent, expect roughly 989–1194 min gate-to-gate on this route.
How often does SFO–SIN fly?
2 carriers operate this route, around 28 flights a week between them. Compare carrier days and times in the airline list above.
What does the route health score measure?
A blend of departure-side delay at SFO and arrival-side delay at SIN, computed from rolling delay windows (refreshed every 40 minutes) with a daily-rollup fallback. Current MVFR, IFR, or LIFR endpoint weather caps the score when flight rules can limit throughput. Higher is healthier: 100 means operations are clean at both ends.
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