Sit on the Left side of the plane for the best views on flights from Bangkok to London. Left side wins at both ends of the flight. During the long cruise the left side also faces generally south, giving views toward the Himalayas as you cross northern India, and the Iranian plateau and Zagros Mountains over the Middle East. The right side faces north toward less dramatic terrain for most of the route.

During takeoff from Bangkok International (BKK), sit on the Left side for the best views. Suvarnabhumi's primary departure runway 19L/01R means northbound departures climb out heading roughly north, then turn west. A left-side seat gives you the view back over central Bangkok, the Chao Phraya River snaking through the city, and the dense urban grid of the metropolitan area as you gain altitude. Notable sights include: Chao Phraya River bends through central Bangkok, the dense urban sprawl of greater Bangkok, the Gulf of Thailand visible to the southeast, flat central plains of the Chao Phraya basin.

When landing at Heathrow (LHR), sit on the Left side for the best views. Heathrow predominantly uses westerly runway approaches (09L/27R and 09R/27L). On the standard westerly approach over London, aircraft track from the east over the city. A left-side seat on final approach gives you the view south over central London — the Thames, Tower Bridge, the City of London, and Canary Wharf are all visible to the south of the approach track. Notable sights include: River Thames winding through central London, Canary Wharf tower cluster, The City of London skyline, Windsor Castle and Windsor Great Park near touchdown.

The flight from Bangkok International (BKK) to Heathrow (LHR) takes Approximately 11 to 12 hours.

The route tracks northwest from Bangkok across Myanmar and the Bay of Bengal coast, then over northeastern India where the Brahmaputra valley and foothills of the eastern Himalayas are visible. Crossing northern India the Ganges plain stretches below. Over Pakistan and Afghanistan the Hindu Kush and Karakoram ranges appear to the north. The route then crosses Iran with the Zagros Mountains and the central Iranian plateau, before crossing the Caspian Sea, the Caucasus region, Turkey, and southeastern Europe including the Balkans and the Alps before descending into the UK.