Distance From Houlton International Airport to Sofia Airport, HUL - SOF Distance

The distance from Houlton International Airport (HUL) to Sofia Airport (SOF) is 4245 miles or 6832 kilometers or 3687 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 Houlton ( United States ) to Sofia ( Bulgaria )?

A one-way nonstop (direct) flight between Houlton and Sofia takes around 9 hours 45 minutes.

Estimated flight time from Houlton International Airport, Houlton, United States to Sofia Airport, Sofia, Bulgaria is 9 hours 45 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 • HUL - SOF

Kilometers		6832 km
Statute Miles		4245 miles
Nautical Miles		3687 nm
Avg. Time of Flight		9 hours 45 minutes

Houlton International Airport to Sofia Airport Flight Route Map - HUL to SOF Flight Path

Location of Houlton International Airport & Sofia Airport is given below.
Click the map to view Houlton to Sofia nonstop flight path and travel direction.

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

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

Time Difference Between the Airports • HUL - SOF

Time difference between Houlton (United States) and Sofia (Bulgaria) is 7 Hours.
Sofia time is 7 Hours ahead of Houlton.

Location	Local Time
Houlton (United States)	2026-06-19, 13:38:44 EDT
Sofia (Bulgaria)	2026-06-19, 20:38:44 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

Houlton International Airport (HUL / KHUL) Houlton, United States

Destination

Sofia Airport (SOF / LBSF) Sofia, Bulgaria