The flight distance from San Francisco International Airport (SFO) in San Francisco, United States to Silistra Polkovnik Lambrinovo Airfield (SLS) in Silistra, Bulgaria is 10,430 kilometers (6,481 miles / 5,632 nautical miles). The estimated flight time for this route is approximately 13h, flying north northeast at a heading of 21°.

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 04:01 in San Francisco, it's 14:01 in Silistra. 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 Silistra (SLS) to San Francisco (SFO) follows a heading of 336° (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 San Francisco International Airport (SFO) and Silistra Polkovnik Lambrinovo Airfield (SLS) detail pages, or use our flight duration calculator to compare other routes.