# Distance from Washington (IAD) to Siem Reap (REP)

> 14,197 km · estimated flight time 18h · Ultra-long-haul route.

## Summary

- **Distance**: 14,197 km / 8,822 mi / 7,666 nm
- **Estimated flight time**: 18h
- **Heading**: 358° (north)
- **Return heading**: 1° (north)
- **Classification**: Ultra-long-haul
- **Type**: International (United States) → Cambodia
- **Intercontinental**: North America → Asia
- **Time difference**: +11h (When it's 21:20 in Washington, it's 08:20 in Siem Reap)
- **Elevation difference**: 252 ft (REP 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

### [Angkor International Airport (REP)](https://www.flightduration.online/airport/rep-siem-reap-angkor-international-airport/1ef266df-efb8-691a-a780-06bb2780ed98)

- City: Siem Reap, Cambodia
- ICAO: VDSR
- Timezone: Asia/Phnom_Penh
- Coordinates: 13.410000, 103.810000
- Elevation: 60 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 21:20 in Washington, it's 08:20 in Siem Reap.
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)
- [Angkor International Airport (REP)](https://www.flightduration.online/airport/rep-siem-reap-angkor-international-airport/1ef266df-efb8-691a-a780-06bb2780ed98)
- [Flight duration calculator](/#calculator)