# Distance from Eureka (NLN) to Sofia (SOF)

> 10,177 km · estimated flight time 13h · Ultra-long-haul route.

## Summary

- **Distance**: 10,177 km / 6,323 mi / 5,495 nm
- **Estimated flight time**: 13h
- **Heading**: 23° (north northeast)
- **Return heading**: 336° (north northwest)
- **Classification**: Ultra-long-haul
- **Type**: International (United States) → Bulgaria
- **Intercontinental**: North America → Europe
- **Time difference**: +10h (When it's 21:37 in Eureka, it's 07:37 in Sofia)
- **Elevation difference**: 999 ft (SOF is lower than NLN)

## Airports

### [Kneeland Airport (NLN)](https://www.flightduration.online/airport/nln-eureka-kneeland-airport/1ef266df-2f4e-6ecc-a29b-06bb2780ed98)

- City: Eureka, United States
- ICAO: KO19
- Timezone: America/Los_Angeles
- Coordinates: 40.720000, -123.930000
- Elevation: 2,741 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 21:37 in Eureka, it's 07:37 in Sofia.
With a 10-hour time difference, expect significant jet lag.

## Related

- [Kneeland Airport (NLN)](https://www.flightduration.online/airport/nln-eureka-kneeland-airport/1ef266df-2f4e-6ecc-a29b-06bb2780ed98)
- [Sofia Airport (SOF)](https://www.flightduration.online/airport/sof-sofia-sofia-airport/1ef266df-436b-611c-bff1-06bb2780ed98)
- [Flight duration calculator](/#calculator)