The flight distance from Chiang Rai International Airport (CEI) in Chiang Rai, Thailand to London Heathrow Airport (LHR) in London, United Kingdom is 8,972 kilometers (5,575 miles / 4,845 nautical miles). The estimated flight time for this route is approximately 12h, flying northwest at a heading of 322°.

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 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 15:07 in Chiang Rai, it's 09:07 in London. With a 6-hour time difference, travelers should plan for significant jet lag. It typically takes one day per hour of time difference to fully adjust.

There is a significant elevation difference of 1,197 feet between the two airports. London Heathrow Airport sits lower than Chiang Rai International Airport.

The return flight from London (LHR) to Chiang Rai (CEI) follows a heading of 70° (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 Rai International Airport (CEI) and London Heathrow Airport (LHR) detail pages, or use our flight duration calculator to compare other routes.