Seattle to Singapore
16h 33mgate to gate
The flight from Seattle–Tacoma International Airport (SEA) to Singapore Changi Airport (SIN) covers 12,979 km (8,065 miles) and takes approximately 16h 33m gate to gate for a typical jet.
The route heads north-west on an initial great-circle bearing of 306°, passing near 46.4° N, 146.6° E at its midpoint.
Bearing 306° north-west Midpoint 46.4° N, 146.6° E Model 805 km/h + 25 min
SOURCE·OurAirports + great-circle computation·REVIEWED JUL 2026
How this is worked out
- Take both airports' published coordinates from OurAirports — nothing here is scraped from another flight site.
- Great-circle distance by haversine on a mean earth radius of 6,371.0088 km: 12,979 km.
- Airborne time = that distance ÷ 805 km/h, a representative jet cruise speed: 16h 07m.
- Add a flat 25 minutes for pushback, taxi, climb, descent and taxi-in — the reason a 400 km hop is never half an hour: 16h 33m gate to gate.
- Winds, aircraft type and airline schedule padding are not modelled. The cruise-speed table shows how much that assumption is worth.
12,979 km / 805 km/h = 16h 07m airborne
+ 25 min ground = 16h 33m gate to gate
SOURCE·OurAirports + great-circle computation·REVIEWED JUL 2026
The same route, plotted on a world grid
The strip above gives the route its length and its shape. This gives it a position: latitude and longitude only, no coastlines, because a hand-drawn coastline would be decoration pretending to be data. On a flat grid the shortest path looks bent; on a globe it is straight.
Flight time at different cruise speeds
Aircraft type, winds and routing all move the real number. This is the same distance flown at different speeds, plus the 25-minute ground and climb allowance.
| Typical of | Cruise speed | Airborne | Gate to gate |
|---|---|---|---|
| Turboprop / regional | 550 km/h | 23h 36m | 24h 01m |
| Narrowbody jet (A320, 737) | 780 km/h | 16h 38m | 17h 04m |
| Widebody jet (777, 787, A350) | 900 km/h | 14h 25m | 14h 50m |
| Private jet (Gulfstream) | 850 km/h | 15h 16m | 15h 41m |
Headwinds on an eastbound long-haul routinely add 30–60 minutes; the same route westbound can be quicker. Airlines publish schedules with padding built in.
SOURCE·OurAirports + great-circle computation·REVIEWED JUL 2026
Both airports
| SEA | SIN | |
|---|---|---|
| Airport | Seattle–Tacoma International Airport | Singapore Changi Airport |
| City | Seattle | Singapore |
| Country | United States | Singapore |
| ICAO | KSEA | WSSS |
| Coordinates | 47.4479, -122.3103 | 1.3502, 103.994 |
| Elevation | 433 ft | 22 ft |
Every figure on this plate is geometry. The shape of the earth is knowable; the airline's schedule is not.
Questions this plate answers
How long is the flight from Seattle to Singapore?
A non-stop flight from Seattle (SEA) to Singapore (SIN) takes about 16h 33m. The great-circle distance is 12,979 km (8,065 miles, 7,008 nautical miles), flying north-west on an initial bearing of 306°.
How far is Seattle from Singapore?
12,979 kilometres in a straight line over the earth's surface — 8,065 miles or 7,008 nautical miles. Actual flown distance is usually 2–5% longer because aircraft follow airways, avoid weather and route around restricted airspace.
Is there a non-stop flight between SEA and SIN?
This page calculates the direct-line time and distance; it does not track airline schedules. At 12,979 km the route is within reach of long-range widebodies, though not every city pair is served non-stop. Check an airline or booking site for what is actually scheduled.
What should I expect on a 16h 33m flight?
Anything past six hours is a long-haul flight: expect at least one meal service, a significant time-zone shift, and enough sitting that circulation and hydration start to matter. Cabin altitude, dry air and disrupted sleep do more damage to a training routine than the flight itself.
Airport coordinates from OurAirports (public domain). Distance is a great-circle calculation; flight time uses the model described on the method page. Flight times are great-circle estimates for planning only — always check the airline's published schedule.
