London→BangkokNonstop Flight TimeLHR–BKK

London (London Heathrow Airport) to Bangkok (Suvarnabhumi Airport).

Direct flights from LHR to BKK have an estimated flight time of about 12h 52m, based on the 5,951-mile great-circle distance. Our current captured departure sample includes 3/day across 2 captured airlines, with Thai Airways appearing most often in that sample. Captured departure times run from 12:30 to 21:35 local time.

Methodology: airline, aircraft, terminal, and departure-time details come from the rolling scheduled-departures window for LHR to BKK, last seen June 15, 2026. Frequency uses 21 scheduled departures across 7 observed days; flight time is estimated from great-circle distance until this route has enough tracked flights for an observed average. Provider coverage can miss operators on some routes, so confirm live timetables before booking.