Sit on the Right side of the plane for the best views on flights from London to Bangkok. The right side delivers the more dramatic takeoff experience over London with the Thames and city skyline, and along the cruise portion the right side faces south, offering views over the Himalayas including Everest and Kangchenjunga as the route crosses Nepal and northern India. The landing view is slightly better on the left, but the Himalayan panorama mid-flight tips the overall balance firmly to the right.

During takeoff from Heathrow (LHR), sit on the Right side for the best views. Heathrow's dominant departure runway is 27L/27R heading west, so a right-side seat faces north over central London during the climbing left turn back eastward. You get a clear view of the Thames snaking through the city, the dense urban grid of West London, and on clear days the City of London skyline in the distance. Notable sights include: River Thames bends through West London, Wembley Stadium arch, Windsor Castle and Great Park to the southwest, City of London skyline on the horizon.

When landing at Bangkok International (BKK), sit on the Left side for the best views. Suvarnabhumi Airport typically uses runways 19L/19R for southward landings or 01L/01R for northward approaches depending on wind. On the common southward approach over the Gulf of Thailand, the left side faces east toward Bangkok city and the Chao Phraya River delta, giving a clear view of the urban sprawl and river mouth. On northward approaches, the left side still captures the city grid and river. Notable sights include: Chao Phraya River winding through Bangkok, Gulf of Thailand coastline, Bangkok urban grid and expressway network, mangrove and paddy field patchwork of the central plains.

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

The route tracks southeast over continental Europe crossing the Alps, then over Turkey and the Anatolian plateau, across Iran and the Zagros Mountains, over Pakistan and the Indus Valley, then crucially across northern India and Nepal where the Himalayan range including Mount Everest and Kangchenjunga is visible to the right side on clear days, before descending over the Bay of Bengal and the flat Indochina peninsula into Bangkok