# Distance from Siem Reap (REP) to St Louis (STL)

> 14,031 km · estimated flight time 18h · Ultra-long-haul route.

## Summary

- **Distance**: 14,031 km / 8,718 mi / 7,576 nm
- **Estimated flight time**: 18h
- **Heading**: 14° (north northeast)
- **Return heading**: 343° (north northwest)
- **Classification**: Ultra-long-haul
- **Type**: International (Cambodia) → United States
- **Intercontinental**: Asia → North America
- **Time difference**: -12h (When it's 03:31 in Siem Reap, it's 15:31 in St Louis)
- **Elevation difference**: 557 ft (STL is higher than REP)

## Airports

### [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

### [St Louis Lambert International Airport (STL)](https://www.flightduration.online/airport/stl-st-louis-st-louis-lambert-international-airport/1ef266df-39ab-67da-9abe-06bb2780ed98)

- City: St Louis, United States
- ICAO: KSTL
- Timezone: America/Chicago
- Coordinates: 38.750000, -90.370000
- Elevation: 617 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 03:31 in Siem Reap, it's 15:31 in St Louis.
With a 12-hour time difference, expect significant jet lag.

## Related

- [Angkor International Airport (REP)](https://www.flightduration.online/airport/rep-siem-reap-angkor-international-airport/1ef266df-efb8-691a-a780-06bb2780ed98)
- [St Louis Lambert International Airport (STL)](https://www.flightduration.online/airport/stl-st-louis-st-louis-lambert-international-airport/1ef266df-39ab-67da-9abe-06bb2780ed98)
- [Flight duration calculator](/#calculator)