The flight distance from St Louis Regional Airport (ALN) in Alton/St Louis, United States to Sofia Airport (SOF) in Sofia, Bulgaria is 8,737 kilometers (5,429 miles / 4,718 nautical miles). The estimated flight time for this route is approximately 11h, flying northeast at a heading of 43°.

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 10:53 in Alton/St Louis, it's 18:53 in Sofia. With a 8-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 1,199 feet between the two airports. Sofia Airport sits higher than St Louis Regional Airport.

The return flight from Sofia (SOF) to Alton/St Louis (ALN) follows a heading of 313° (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 St Louis Regional Airport (ALN) and Sofia Airport (SOF) detail pages, or use our flight duration calculator to compare other routes.