Flight distance between SEA and USM

About this route

The direct flight distance between SEA (Seattle) (SEA) and USM (Koh Samui) (USM) is approximately 12,426 kilometers (7,721 miles). An average commercial jet flying non-stop at a cruising speed of 900 km/h requires about 14h 18min of total flight time, including 30 minutes for taxiing, takeoff, and landing procedures. Travelers flying this route will cross time zones, experiencing an official time difference of +14h between the departure and arrival locations. Estimated carbon emissions for an economy class passenger on this route are roughly 1,429 kg of CO2. Use our interactive flight range map and route calculator to plan connections, compare airlines, and analyze flight paths between SEA and USM.