# Distance from Roundup (RPX) to Sofia (SOF)

> 9,026 km · estimated flight time 12h · Ultra-long-haul route.

## Summary

- **Distance**: 9,026 km / 5,608 mi / 4,874 nm
- **Estimated flight time**: 12h
- **Heading**: 34° (north northeast)
- **Return heading**: 329° (north northwest)
- **Classification**: Ultra-long-haul
- **Type**: International (United States) → Bulgaria
- **Intercontinental**: North America → Europe
- **Time difference**: +9h (When it's 23:17 in Roundup, it's 08:17 in Sofia)
- **Elevation difference**: 1,748 ft (SOF is lower than RPX)

## Airports

### [Roundup Airport (RPX)](https://www.flightduration.online/airport/rpx-roundup-roundup-airport/1ef266df-35b3-6aec-afe9-06bb2780ed98)

- City: Roundup, United States
- ICAO: KRPX
- Timezone: America/Denver
- Coordinates: 46.480000, -108.540000
- Elevation: 3,490 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 23:17 in Roundup, it's 08:17 in Sofia.
With a 9-hour time difference, expect significant jet lag.

## Related

- [Roundup Airport (RPX)](https://www.flightduration.online/airport/rpx-roundup-roundup-airport/1ef266df-35b3-6aec-afe9-06bb2780ed98)
- [Sofia Airport (SOF)](https://www.flightduration.online/airport/sof-sofia-sofia-airport/1ef266df-436b-611c-bff1-06bb2780ed98)
- [Flight duration calculator](/#calculator)