The flight distance from Houlton International Airport (HUL) in Houlton, United States to Sofia Airport (SOF) in Sofia, Bulgaria is 6,831 kilometers (4,245 miles / 3,689 nautical miles). The estimated flight time for this route is approximately 9h, flying east northeast at a heading of 57°.

This is a long-haul route typically operated by wide-body aircraft such as the Boeing 777 or Airbus A350. Full meal service, in-flight entertainment, and comfort amenities are standard.

This is an international route connecting United States with Bulgaria. It is an intercontinental flight between North America and Europe. Travelers should check visa requirements, customs regulations, and any travel advisories before booking.

Time zone information: When it's 14:35 in Houlton, it's 21:35 in Sofia. With a 7-hour time difference, travelers should plan for significant jet lag. It typically takes one day per hour of time difference to fully adjust.

There is a significant elevation difference of 1,253 feet between the two airports. Sofia Airport sits higher than Houlton International Airport.

The return flight from Sofia (SOF) to Houlton (HUL) follows a heading of 308° (northwest). Actual flight times may vary depending on wind conditions, air traffic, and the specific aircraft used.

For more information about these airports, visit the Houlton International Airport (HUL) and Sofia Airport (SOF) detail pages, or use our flight duration calculator to compare other routes.