Flights from London to Bangkok

London Heathrow to Bangkok Suvarnabhumi is one of the longest regularly flown Kangaroo Route legs — roughly 11-12 hours non-stop, or 13-15 hours with a one-stop itinerary through the Gulf. Thai Airways, British Airways, and EVA Air operate direct seasonal or year-round service; one-stop options through Singapore, Doha, Dubai, or Istanbul typically undercut direct fares by 20-30%. Shoulder seasons (May-June and September-October) consistently return the lowest prices, often under £550 round-trip in economy from London if booked 2-3 months out.