# Distance from Seoul (ICN) to Spearfish (SPF)

> 9,599 km · estimated flight time 12h · Ultra-long-haul route.

## Summary

- **Distance**: 9,599 km / 5,965 mi / 5,183 nm
- **Estimated flight time**: 12h
- **Heading**: 33° (north northeast)
- **Return heading**: 322° (northwest)
- **Classification**: Ultra-long-haul
- **Type**: International (South Korea) → United States
- **Intercontinental**: Asia → North America
- **Time difference**: -15h (When it's 16:48 in Seoul, it's 01:48 in Spearfish)
- **Elevation difference**: 3,910 ft (SPF is higher than ICN)

## Airports

### [Incheon International Airport (ICN)](https://www.flightduration.online/airport/icn-seoul-incheon-international-airport/1ef266df-8e0e-6aac-85a0-06bb2780ed98)

- City: Seoul, South Korea
- ICAO: RKSI
- Timezone: Asia/Seoul
- Coordinates: 37.470000, 126.450000
- Elevation: 23 ft

### [Black Hills-Clyde Ice Field (SPF)](https://www.flightduration.online/airport/spf-spearfish-black-hills-clyde-ice-field/1ef266df-3948-6c5c-a35d-06bb2780ed98)

- City: Spearfish, United States
- ICAO: KSPF
- Timezone: America/Denver
- Coordinates: 44.480000, -103.790000
- Elevation: 3,933 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 16:48 in Seoul, it's 01:48 in Spearfish.
With a 15-hour time difference, expect significant jet lag.

## Related

- [Incheon International Airport (ICN)](https://www.flightduration.online/airport/icn-seoul-incheon-international-airport/1ef266df-8e0e-6aac-85a0-06bb2780ed98)
- [Black Hills-Clyde Ice Field (SPF)](https://www.flightduration.online/airport/spf-spearfish-black-hills-clyde-ice-field/1ef266df-3948-6c5c-a35d-06bb2780ed98)
- [Flight duration calculator](/#calculator)