# Distance from Seattle (SEA) to Na Thon (Ko Samui Island) (USM)

> 12,425 km · estimated flight time 16h · Ultra-long-haul route.

## Summary

- **Distance**: 12,425 km / 7,721 mi / 6,709 nm
- **Estimated flight time**: 16h
- **Heading**: 314° (northwest)
- **Return heading**: 29° (north northeast)
- **Classification**: Ultra-long-haul
- **Type**: International (United States) → Thailand
- **Intercontinental**: North America → Asia
- **Time difference**: +14h (When it's 15:23 in Seattle, it's 05:23 in Na Thon (Ko Samui Island))
- **Elevation difference**: 368 ft (USM is lower than SEA)

## Airports

### [Seattle-Tacoma International Airport (SEA)](https://www.flightduration.online/airport/sea-seattle-seattle-tacoma-international-airport/1ef266df-37e8-64a2-a4f1-06bb2780ed98)

- City: Seattle, United States
- ICAO: KSEA
- Timezone: America/Los_Angeles
- Coordinates: 47.450000, -122.310000
- Elevation: 432 ft

### [Samui Airport (USM)](https://www.flightduration.online/airport/usm-na-thon-ko-samui-island-samui-airport/1ef266df-f5a3-6c12-8349-06bb2780ed98)

- City: Na Thon (Ko Samui Island), Thailand
- ICAO: VTSM
- Timezone: Asia/Bangkok
- Coordinates: 9.550000, 100.060000
- Elevation: 64 ft

## Route notes

This is an ultra-long-haul route, one of the longest in aviation. It requires wide-body aircraft with extended range capability such as the Airbus A350-900ULR or Boeing 777-200LR. Passengers should prepare for an extended flight with multiple meal services.

Time-zone information: When it's 15:23 in Seattle, it's 05:23 in Na Thon (Ko Samui Island).
With a 14-hour time difference, expect significant jet lag.

## Related

- [Seattle-Tacoma International Airport (SEA)](https://www.flightduration.online/airport/sea-seattle-seattle-tacoma-international-airport/1ef266df-37e8-64a2-a4f1-06bb2780ed98)
- [Samui Airport (USM)](https://www.flightduration.online/airport/usm-na-thon-ko-samui-island-samui-airport/1ef266df-f5a3-6c12-8349-06bb2780ed98)
- [Flight duration calculator](/#calculator)