Singapore AirlinesSQ
Flights SQ28 09:00 Tu Th Fr Sa Su
live
Direct flights from Singapore (SIN) to Seattle (SEA): 5 nonstop departures observed each week across 1 airline. The median arrival is 9 minutes late. No cancellations were recorded across the 4 tracked flights. The nonstop covers 12,979 km, an estimated 17 hours 8 minutes in the air. Measured by Pro Flight Search from live flight boards at Singapore and Seattle. Updated 8 September 2026 at 07:18 UTC.
SIN
Singapore
smooth · +3
SEA
Seattle
smooth · +0
12,979 km · ~17h 08m est.
Running clean · 1 airline · 5x weekly · nonstop
96 / 100
route health from live SIN and SEA delay boards
Median arrival delay is +9 min. 0 of 4 tracked legs cancelled in the sample. Will a delayed flight be cancelled? →
Median arrival+9 minacross the last 4 operated legs
Flight time~17h 08mestimated from route distance
Weekly departures5x1 direct airline on the leg
The week
scheduled departures · origin local time06121824
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Singapore 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
Current conditions put the pressure at SEA: 29% odds of a 15+ minute delay and around +2 min expected when it bites, measured from this route's own weather-matched delay history. See live delays → · Weather risk by airport →
next sweep in 120s
How the Singapore to Seattle route actually runs
Pro Flight Search records official board updates for nonstop SIN to SEA 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 — Singapore (SIN) to Seattle (SEA) route reliability, measured from operated flights on official airport boards.
Canonical URL
How we measure this →
https://proflightsearch.com/search-flights/SIN-SEA
SIN to SEA questions
Is SIN–SEA running on time right now?
Smooth skies ahead. The departure side at SIN is the weaker end, route health score 96/100. The airports section above carries the live status and delay window at both ends.
How long is the flight from SIN to SEA?
Great-circle distance is 12,979 km. With typical jet cruise speed plus taxi, climb and descent, expect roughly 946–1142 min gate-to-gate on this route.
How often does SIN–SEA fly?
Singapore Airlines runs the route with about 5 flights a week (sun, tue, thu, fri, sat). Since one carrier owns the route, a single disruption tends to ripple through the day.
What does the route health score measure?
A blend of departure-side delay at SIN and arrival-side delay at SEA, 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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