# Distance from Washington (IAD) to Nakhon Si Thammarat (NST)

> 14,733 km · estimated flight time 18h · Ultra-long-haul route.

## Summary

- **Distance**: 14,733 km / 9,155 mi / 7,955 nm
- **Estimated flight time**: 18h
- **Heading**: 3° (north)
- **Return heading**: 357° (north)
- **Classification**: Ultra-long-haul
- **Type**: International (United States) → Thailand
- **Intercontinental**: North America → Asia
- **Time difference**: +11h (When it's 18:37 in Washington, it's 05:37 in Nakhon Si Thammarat)
- **Elevation difference**: 299 ft (NST is lower than IAD)

## Airports

### [Washington Dulles International Airport (IAD)](https://www.flightduration.online/airport/iad-washington-washington-dulles-international-airport/1ef266df-22cc-64e2-b8c0-06bb2780ed98)

- City: Washington, United States
- ICAO: KIAD
- Timezone: America/New_York
- Coordinates: 38.900000, -77.500000
- Elevation: 312 ft

### [Nakhon Si Thammarat Airport (NST)](https://www.flightduration.online/airport/nst-nakhon-si-thammarat-nakhon-si-thammarat-airport/1ef266df-f592-65a2-bd35-06bb2780ed98)

- City: Nakhon Si Thammarat, Thailand
- ICAO: VTSF
- Timezone: Asia/Bangkok
- Coordinates: 8.540000, 99.940000
- Elevation: 13 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 18:37 in Washington, it's 05:37 in Nakhon Si Thammarat.
With a 11-hour time difference, expect significant jet lag.

## Related

- [Washington Dulles International Airport (IAD)](https://www.flightduration.online/airport/iad-washington-washington-dulles-international-airport/1ef266df-22cc-64e2-b8c0-06bb2780ed98)
- [Nakhon Si Thammarat Airport (NST)](https://www.flightduration.online/airport/nst-nakhon-si-thammarat-nakhon-si-thammarat-airport/1ef266df-f592-65a2-bd35-06bb2780ed98)
- [Flight duration calculator](/#calculator)