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SEA to KOS: distance & flight time
Seattle (Seattle Tacoma International Airport) → Sihanoukville (Sihanoukville International Airport)
7,537 mi
12,130 km · 6,550 nm
15h 15m
estimated nonstop flight time
+14h
time difference · heading northwest
See live SEA→KOS fares Phone-only fares on this route — call free
Flight time details
7,537 miles nonstop takes roughly 15h 15m gate to gate, flying northwest. Add 45–90 minutes per connection if there's no nonstop service. Remember to factor the 14-hour time gain when reading arrival times on your ticket.
The two airports
- SEA — Seattle Tacoma International Airport · Seattle, United States
- KOS — Sihanoukville International Airport · Sihanoukville, Cambodia
Distances are great-circle ("as the crow flies") — the same basis airlines use for frequent-flyer miles.
Alternate airports can cut this fare
Flying from or into a nearby airport is the #1 trick our agents use to beat online prices. Call and we'll compare every combination on one call.
Near SEA
- RNT · Renton Municipal Airport5 mi away
- BFI · Boeing Field King County International Airport6 mi away
- TIW · Tacoma Narrows Airport18 mi away
- PWT · Bremerton National Airport21 mi away
Near KOS
- PQC · Phu Quoc International Airport37 mi away
- PNH · Phnom Penh International Airport106 mi away
- VKG · Rach Gia Airport110 mi away
- KZC · Kampong Chhnang Airport132 mi away
Frequently asked questions
How far is SEA from KOS?
The flight distance from Seattle (SEA) to Sihanoukville (KOS) is 7,537 miles (12,130 km, 6,550 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from SEA to KOS?
A nonstop flight takes about 15h 15m gate to gate. Actual time varies with winds, routing and season — eastbound transatlantic flights, for example, are usually faster than the return.
What is the time difference between Seattle and Sihanoukville?
Sihanoukville is 14 hours ahead of Seattle.
What is the cheapest way to fly from SEA to KOS?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on SEA–KOS that never appear on search engines, with no booking fees.