Are there nonstop flights from London (LGW) to Chiang Rai (CEI)?

No. The fastest connection is via Bangkok, about 13h 6m of total flying time.

What is the fastest connection from London (LGW) to Chiang Rai (CEI)?

via Bangkok ≈ 13h 6m, via Phuket ≈ 14h 12m, via Singapore ≈ 16h 16m (estimated flying time, excluding layovers).

London Gatwick Airport (LGW) to Mae Fah Luang - Chiang Rai International Airport (CEI)・8,967 km

No nonstop flights. The fastest connection is via Bangkok (BKK), about 13h 6m of flying time (layover not included).

None.

3 one-stop options, sorted by estimated flying time. Tap one to see the airlines on each leg and booking links.

Times are estimated from distance. Check schedules, frequency and availability with the airline or a booking site.