The flight distance from London Heathrow Airport (LHR) in London, United Kingdom to The Florida Keys Marathon International Airport (MTH) in Marathon, United States is 7,248 kilometers (4,504 miles / 3,913 nautical miles). The estimated flight time for this route is approximately 10h, flying west at a heading of 279°.

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 Kingdom 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 17:27 in London, it's 12:27 in Marathon. The 5-hour time difference may cause some jet lag. Most travelers adjust within a day or two.

The return flight from Marathon (MTH) to London (LHR) follows a heading of 43° (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 London Heathrow Airport (LHR) and The Florida Keys Marathon International Airport (MTH) detail pages, or use our flight duration calculator to compare other routes.