The flight distance from Castle Airport (MER) in Atwater, United States to Sofia Airport (SOF) in Sofia, Bulgaria is 10,393 kilometers (6,458 miles / 5,612 nautical miles). The estimated flight time for this route is approximately 13h, flying north northeast at a heading of 26°.

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.

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 09:59 in Atwater, it's 19:59 in Sofia. With a 10-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 1,552 feet between the two airports. Sofia Airport sits higher than Castle Airport.

The return flight from Sofia (SOF) to Atwater (MER) follows a heading of 332° (north 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 Castle Airport (MER) and Sofia Airport (SOF) detail pages, or use our flight duration calculator to compare other routes.