The flight distance from The Florida Keys Marathon International Airport (MTH) in Marathon, United States to San Francisco International Airport (SFO) in San Francisco, United States is 4,146 kilometers (2,576 miles / 2,239 nautical miles). The estimated flight time for this route is approximately 6h, flying west northwest at a heading of 300°.

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 a domestic route within United States. Both airports operate in the same country, which may simplify travel requirements and documentation. Despite being a domestic route, there is a 3-hour time difference between the two cities.

Time zone information: When it's 12:03 in Marathon, it's 09:03 in San Francisco. The 3-hour time difference may cause some jet lag. Most travelers adjust within a day or two.

The return flight from San Francisco (SFO) to Marathon (MTH) follows a heading of 98° (east). Actual flight times may vary depending on wind conditions, air traffic, and the specific aircraft used.

For more information about these airports, visit the The Florida Keys Marathon International Airport (MTH) and San Francisco International Airport (SFO) detail pages, or use our flight duration calculator to compare other routes.