The flight distance from Eleftherios Venizelos International Airport (ATH) in Athens, Greece to Boeing Field/King County International Airport (BFI) in Seattle, United States is 9,939 kilometers (6,176 miles / 5,366 nautical miles). The estimated flight time for this route is approximately 13h, flying north northwest at a heading of 338°.

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 Greece with United States. It is an intercontinental flight between Europe and North America. Travelers should check visa requirements, customs regulations, and any travel advisories before booking.

Time zone information: When it's 09:54 in Athens, it's 23:54 in Seattle. 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 Seattle (BFI) to Athens (ATH) follows a heading of 26° (north northeast). Actual flight times may vary depending on wind conditions, air traffic, and the specific aircraft used.

For more information about these airports, visit the Eleftherios Venizelos International Airport (ATH) and Boeing Field/King County International Airport (BFI) detail pages, or use our flight duration calculator to compare other routes.