# Distance from Sofia (SOF) to Sterling (STK)

> 9,317 km · estimated flight time 12h · Ultra-long-haul route.

## Summary

- **Distance**: 9,317 km / 5,789 mi / 5,031 nm
- **Estimated flight time**: 12h
- **Heading**: 322° (northwest)
- **Return heading**: 36° (northeast)
- **Classification**: Ultra-long-haul
- **Type**: International (Bulgaria) → United States
- **Intercontinental**: Europe → North America
- **Time difference**: -9h (When it's 16:47 in Sofia, it's 07:47 in Sterling)
- **Elevation difference**: 2,296 ft (STK is higher than SOF)

## Airports

### [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

### [Sterling Municipal Airport (STK)](https://www.flightduration.online/airport/stk-sterling-sterling-municipal-airport/1ef266df-39a7-69be-acd9-06bb2780ed98)

- City: Sterling, United States
- ICAO: KSTK
- Timezone: America/Denver
- Coordinates: 40.610000, -103.260000
- Elevation: 4,038 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 16:47 in Sofia, it's 07:47 in Sterling.
With a 9-hour time difference, expect significant jet lag.

## Related

- [Sofia Airport (SOF)](https://www.flightduration.online/airport/sof-sofia-sofia-airport/1ef266df-436b-611c-bff1-06bb2780ed98)
- [Sterling Municipal Airport (STK)](https://www.flightduration.online/airport/stk-sterling-sterling-municipal-airport/1ef266df-39a7-69be-acd9-06bb2780ed98)
- [Flight duration calculator](/#calculator)