The flight distance from San Francisco International Airport (SFO) in San Francisco, United States to Sines Airport (SIE) in Sines Airport, Portugal is 9,205 kilometers (5,720 miles / 4,970 nautical miles). The estimated flight time for this route is approximately 12h, flying northeast at a heading of 47°.

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 Portugal. 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 00:40 in San Francisco, it's 08:40 in Sines Airport. 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.

The return flight from Sines Airport (SIE) to San Francisco (SFO) 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 San Francisco International Airport (SFO) and Sines Airport (SIE) detail pages, or use our flight duration calculator to compare other routes.