JetSetAuthority

Route · Trans-Pacific

SIN Singapore ⇄ SEA Seattle

Singapore Changi Airport (Singapore) and Seattle–Tacoma International Airport (United States): great-circle distance, estimated scheduled flight time each way, time difference and jet lag.

Distance12,979 km8,065 mi7,008 nautical miles
SIN → SEA15 hestimated block time
SEA → SIN16 h 45 minestimated block time
Clock change−15 hSeattle vs Singapore, today
Great-circle route from Singapore (SIN) to Seattle (SEA)SINSingaporeSEASeattle
The shortest path over the Earth’s surface (great circle), drawn on a Natural Earth projection. Real flight paths bend around weather, winds and closed airspace.

Flight time each way

SIN → SEA

15 h

Estimated gate-to-gate scheduled time. Initial heading 33° (NNE).

Leave Singapore Sat 7 Nov, 10:00 local → arrive Seattle Sat 7 Nov, 09:00 local.

SEA → SIN

16 h 45 min

Estimated gate-to-gate scheduled time. Initial heading 306° (NW).

Leave Seattle Sat 7 Nov, 10:00 local → arrive Singapore Sun 8 Nov, 18:45 local +1 day.

SIN-bound flights are the slower direction by about 105 minutes in our estimate: the route runs partly east–west through latitudes where the prevailing westerly winds at cruise height are strong, so heading east rides a tailwind and heading west fights a headwind. How we estimate it.

Distance

Great-circle distance12,979 km · 8,065 mi · 7,008 nmi
Initial heading33° (NNE) from SIN; 306° (NW) from SEA
Farthest from the equator56.8°N — the path arcs north of both airports
Crossesthe 180th meridian (International Date Line area)
Share of the longest possible trip65% of the 20,015 km to the far side of the Earth

Time zones and jet lag

SINAsia/Singapore — UTC+8 now; UTC+8 all year (no daylight saving time)
SEAAmerica/Los_Angeles — UTC−7 now; UTC−8 standard time, UTC−7 during daylight saving time
DifferenceSeattle is 15 hours behind Singapore today; −16 h in January and −15 h in July because daylight saving time starts and ends on different dates (or not at all).

Jet lag, flying SIN → SEA. The clock change is 15 hours, but to your body that is a shift of 9 hours the other way. Your body clock has to move 9 hours earlier, like an eastward trip. A common rule of thumb is that the body clock adjusts by roughly one time zone a day, so expect up to about 9 days to fully adjust. Shifting earlier (as here) is usually the harder direction; morning daylight at the destination helps. Flying the other way, the shift is reversed.

General information, not medical advice.

The two airports

SIN Singapore Changi AirportSingapore, Singapore · longest runway 13,123 ft4,000 m SEA Seattle–Tacoma International AirportSeattle, United States · longest runway 11,901 ft3,627 m

More routes from SIN and SEA

SINKUL Singapore – Kuala Lumpur 297 km185 mi · 1 h 25 min SINDPS Singapore – Bali (Denpasar) 1,672 km1,039 mi · 2 h 55 min SINBOM Singapore – Mumbai 3,922 km2,437 mi · 5 h 35 min SYDSIN Sydney – Singapore 6,293 km3,911 mi · 8 h 30 min CDGSIN Paris – Singapore 10,724 km6,664 mi · 12 h 30 min SINJFK Singapore – New York 15,341 km9,532 mi · 18 h 30 min SFOSEA San Francisco – Seattle 1,093 km679 mi · 2 h 20 min SEADEN Seattle – Denver 1,645 km1,022 mi · 2 h 45 min SEAORD Seattle – Chicago 2,762 km1,716 mi · 3 h 55 min SEAKEF Seattle – Reykjavík 5,811 km3,611 mi · 7 h 25 min SEAHND Seattle – Tokyo 7,711 km4,792 mi · 10 h 35 min SEAICN Seattle – Seoul 8,373 km5,203 mi · 11 h 15 min

Routes of a similar length

JFKHKG New York – Hong Kong 12,970 km8,059 mi · 15 h 55 min JFKJNB New York – Johannesburg 12,831 km7,973 mi · 15 h LAXMEL Los Angeles – Melbourne 12,758 km7,928 mi · 16 h 10 min DXBLAX Dubai – Los Angeles 13,400 km8,327 mi · 16 h 25 min

Need a different pair? The flight-time calculator works for any two of 3,245 airports. Not covered: which airlines fly this route, schedules, fares and live status — that data is proprietary and we don’t guess it.

Photos on airport pages are credited there. Estimates are rounded to 5 minutes; typical error about 13 minutes (validation).