Distance From Deep River Seaplane Base to Sofia Airport

The distance from Deep River Seaplane Base () to Sofia Airport (SOF) is 5276 miles or 8491 kilometers or 4582 nautical miles.

The distance shown below is direct flight distance between airports. Straight-line distance does not account for the surface between the two points. It is the distance a bird or airplane would travel between the two points when flying above the surface. The straight line distance is the direct route between two points, regardless of whether or not there are roads that connect them.

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How long does it take to travel from Upham ( United States ) to Sofia ( Bulgaria )?

A one-way nonstop (direct) flight between Upham and Sofia takes around 12 hours 7 minutes.

Estimated flight time from Deep River Seaplane Base, Upham, United States to Sofia Airport, Sofia, Bulgaria is 12 hours 7 minutes under avarage conditions. Your actual flying time may vary depending on wind direction/speed or weather conditions. This calculation does not include the departure and landing times of the aircraft. In addition, it does not cover the person identity check, ticket check-in and baggage collection times at the airport.

Travel Distance Between the Airports • - SOF

Kilometers		8491 km
Statute Miles		5276 miles
Nautical Miles		4582 nm
Avg. Time of Flight		12 hours 7 minutes

Deep River Seaplane Base to Sofia Airport Flight Route Map - to SOF Flight Path

Location of Deep River Seaplane Base & Sofia Airport is given below.
Click the map to view Upham to Sofia nonstop flight path and travel direction.

Click to see flight route on Google Map between Upham, United States and Sofia, Bulgaria. .

Nonstop flight route between Upham, United States and Sofia, Bulgaria.

Time Difference Between the Airports • - SOF

Time difference between Upham (United States) and Sofia (Bulgaria) is 8 Hours.
Sofia time is 8 Hours ahead of Upham.

Location	Local Time
Upham (United States)	2026-05-07, 08:12:32 CDT
Sofia (Bulgaria)	2026-05-07, 16:12:32 EEST

Why should you arrive 3 hours before international flight? Flyers who are traveling to an international destination should arrive at the airport earlier than domestic flyers. This is because international flights can have additional check-in requirements, like passport verification, that need to be completed before you receive your boarding pass.

Origin

Deep River Seaplane Base ( / 8NA1) Upham, United States

Destination

Sofia Airport (SOF / LBSF) Sofia, Bulgaria