# Distance from Challis (CHL) to Sofia (SOF)

> 9,444 km · estimated flight time 12h · Ultra-long-haul route.

## Summary

- **Distance**: 9,444 km / 5,868 mi / 5,099 nm
- **Estimated flight time**: 12h
- **Heading**: 30° (north northeast)
- **Return heading**: 331° (north northwest)
- **Classification**: Ultra-long-haul
- **Type**: International (United States) → Bulgaria
- **Intercontinental**: North America → Europe
- **Time difference**: +9h (When it's 20:15 in Challis, it's 05:15 in Sofia)
- **Elevation difference**: 3,334 ft (SOF is lower than CHL)

## Airports

### [Challis Airport (CHL)](https://www.flightduration.online/airport/chl-challis-challis-airport/1ef266df-27a4-6eb0-8be0-06bb2780ed98)

- City: Challis, United States
- ICAO: KLLJ
- Timezone: America/Boise
- Coordinates: 44.520000, -114.220000
- Elevation: 5,076 ft

### [Sofia Airport (SOF)](https://www.flightduration.online/airport/sof-sofia-sofia-airport/1ef266df-436b-611c-bff1-06bb2780ed98)

- City: Sofia, Bulgaria
- ICAO: LBSF
- Timezone: Europe/Sofia
- Coordinates: 42.700000, 23.410000
- Elevation: 1,742 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 20:15 in Challis, it's 05:15 in Sofia.
With a 9-hour time difference, expect significant jet lag.

## Related

- [Challis Airport (CHL)](https://www.flightduration.online/airport/chl-challis-challis-airport/1ef266df-27a4-6eb0-8be0-06bb2780ed98)
- [Sofia Airport (SOF)](https://www.flightduration.online/airport/sof-sofia-sofia-airport/1ef266df-436b-611c-bff1-06bb2780ed98)
- [Flight duration calculator](/#calculator)