# Distance from St Louis (STL) to Udon Thani (UTH)

> 13,624 km · estimated flight time 17h · Ultra-long-haul route.

## Summary

- **Distance**: 13,624 km / 8,465 mi / 7,356 nm
- **Estimated flight time**: 17h
- **Heading**: 345° (north northwest)
- **Return heading**: 12° (north northeast)
- **Classification**: Ultra-long-haul
- **Type**: International (United States) → Thailand
- **Intercontinental**: North America → Asia
- **Time difference**: +12h (When it's 22:04 in St Louis, it's 10:04 in Udon Thani)
- **Elevation difference**: 38 ft (UTH is lower than STL)

## Airports

### [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

### [Udon Thani Airport (UTH)](https://www.flightduration.online/airport/uth-udon-thani-udon-thani-airport/1ef266df-f5bc-63ac-928e-06bb2780ed98)

- City: Udon Thani, Thailand
- ICAO: VTUD
- Timezone: Asia/Bangkok
- Coordinates: 17.390000, 102.790000
- Elevation: 579 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 22:04 in St Louis, it's 10:04 in Udon Thani.
With a 12-hour time difference, expect significant jet lag.

## Related

- [St Louis Lambert International Airport (STL)](https://www.flightduration.online/airport/stl-st-louis-st-louis-lambert-international-airport/1ef266df-39ab-67da-9abe-06bb2780ed98)
- [Udon Thani Airport (UTH)](https://www.flightduration.online/airport/uth-udon-thani-udon-thani-airport/1ef266df-f5bc-63ac-928e-06bb2780ed98)
- [Flight duration calculator](/#calculator)