# Distance from Kathmandu (KTM) to Osan Air Base (OSN)

> 4,015 km · estimated flight time 6h · Long-haul route.

## Summary

- **Distance**: 4,015 km / 2,495 mi / 2,168 nm
- **Estimated flight time**: 6h
- **Heading**: 64° (east northeast)
- **Return heading**: 267° (west)
- **Classification**: Long-haul
- **Type**: International (Nepal) → South Korea
- **Time difference**: +3.25h (When it's 13:01 in Kathmandu, it's 16:16 in Osan Air Base)
- **Elevation difference**: 4,352 ft (OSN is lower than KTM)

## Airports

### [Tribhuvan International Airport (KTM)](https://www.flightduration.online/airport/ktm-kathmandu-tribhuvan-international-airport/1ef266df-f304-6ec0-afd1-06bb2780ed98)

- City: Kathmandu, Nepal
- ICAO: VNKT
- Timezone: Asia/Kathmandu
- Coordinates: 27.700000, 85.360000
- Elevation: 4,390 ft

### [Osan Air Base (OSN)](https://www.flightduration.online/airport/osn-osan-air-base/1ef266df-8e18-641c-9d4f-06bb2780ed98)

- City: Osan Air Base, South Korea
- ICAO: RKSO
- Timezone: Asia/Seoul
- Coordinates: 37.090000, 127.030000
- Elevation: 38 ft

## Route notes

This is a long-haul route typically operated by wide-body aircraft such as the Boeing 777 or Airbus A350. Full meal service, in-flight entertainment, and comfort amenities are standard.

Time-zone information: When it's 13:01 in Kathmandu, it's 16:16 in Osan Air Base.
The 3.25-hour time difference may cause some jet lag.

## Related

- [Tribhuvan International Airport (KTM)](https://www.flightduration.online/airport/ktm-kathmandu-tribhuvan-international-airport/1ef266df-f304-6ec0-afd1-06bb2780ed98)
- [Osan Air Base (OSN)](https://www.flightduration.online/airport/osn-osan-air-base/1ef266df-8e18-641c-9d4f-06bb2780ed98)
- [Flight duration calculator](/#calculator)