The flight distance from Boulder City Municipal Airport (BLD) in Boulder City, United States to Sofia Airport (SOF) in Sofia, Bulgaria is 10,300 kilometers (6,400 miles / 5,561 nautical miles). The estimated flight time for this route is approximately 13h, flying north northeast at a heading of 29°.

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 10:37 in Boulder City, it's 20:37 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.

The return flight from Sofia (SOF) to Boulder City (BLD) follows a heading of 327° (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 Boulder City Municipal Airport (BLD) and Sofia Airport (SOF) detail pages, or use our flight duration calculator to compare other routes.