# Distance from Hayden (HDN) to Sofia (SOF)

> 9,521 km · estimated flight time 12h · Ultra-long-haul route.

## Summary

- **Distance**: 9,521 km / 5,916 mi / 5,141 nm
- **Estimated flight time**: 12h
- **Heading**: 34° (northeast)
- **Return heading**: 325° (northwest)
- **Classification**: Ultra-long-haul
- **Type**: International (United States) → Bulgaria
- **Intercontinental**: North America → Europe
- **Time difference**: +9h (When it's 20:15 in Hayden, it's 05:15 in Sofia)
- **Elevation difference**: 4,864 ft (SOF is lower than HDN)

## Airports

### [Yampa Valley Airport (HDN)](https://www.flightduration.online/airport/hdn-hayden-yampa-valley-airport/1ef266df-204e-6274-9537-06bb2780ed98)

- City: Hayden, United States
- ICAO: KHDN
- Timezone: America/Denver
- Coordinates: 40.480000, -107.220000
- Elevation: 6,606 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 Hayden, it's 05:15 in Sofia.
With a 9-hour time difference, expect significant jet lag.

## Related

- [Yampa Valley Airport (HDN)](https://www.flightduration.online/airport/hdn-hayden-yampa-valley-airport/1ef266df-204e-6274-9537-06bb2780ed98)
- [Sofia Airport (SOF)](https://www.flightduration.online/airport/sof-sofia-sofia-airport/1ef266df-436b-611c-bff1-06bb2780ed98)
- [Flight duration calculator](/#calculator)