# Distance from Houston (EFD) to Sofia (SOF)

> 9,819 km · estimated flight time 13h · Ultra-long-haul route.

## Summary

- **Distance**: 9,819 km / 6,102 mi / 5,302 nm
- **Estimated flight time**: 13h
- **Heading**: 40° (northeast)
- **Return heading**: 310° (northwest)
- **Classification**: Ultra-long-haul
- **Type**: International (United States) → Bulgaria
- **Intercontinental**: North America → Europe
- **Time difference**: +8h (When it's 16:02 in Houston, it's 00:02 in Sofia)
- **Elevation difference**: 1,710 ft (SOF is higher than EFD)

## Airports

### [Ellington Airport (EFD)](https://www.flightduration.online/airport/efd-houston-ellington-airport/1ef266df-1967-6c26-9c9e-06bb2780ed98)

- City: Houston, United States
- ICAO: KEFD
- Timezone: America/Chicago
- Coordinates: 29.610000, -95.160000
- Elevation: 33 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 16:02 in Houston, it's 00:02 in Sofia.
With a 8-hour time difference, expect significant jet lag.

## Related

- [Ellington Airport (EFD)](https://www.flightduration.online/airport/efd-houston-ellington-airport/1ef266df-1967-6c26-9c9e-06bb2780ed98)
- [Sofia Airport (SOF)](https://www.flightduration.online/airport/sof-sofia-sofia-airport/1ef266df-436b-611c-bff1-06bb2780ed98)
- [Flight duration calculator](/#calculator)