The flight distance from Chiang Mai International Airport (CNX) in Chiang Mai, Thailand to London Heathrow Airport (LHR) in London, United Kingdom is 9,015 kilometers (5,602 miles / 4,868 nautical miles). The estimated flight time for this route is approximately 12h, flying northwest at a heading of 322°.

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 Thailand with United Kingdom. It is an intercontinental flight between Asia and Europe. Travelers should check visa requirements, customs regulations, and any travel advisories before booking.

Time zone information: When it's 11:45 in Chiang Mai, it's 04:45 in London. With a 7-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 London (LHR) to Chiang Mai (CNX) follows a heading of 71° (east 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 Chiang Mai International Airport (CNX) and London Heathrow Airport (LHR) detail pages, or use our flight duration calculator to compare other routes.