Route
LHR - HND is the first comparison, but nearby UK departure airports can shift the total.

Asia
Japan planning should compare Haneda, Narita, Kansai, first-night hotels, and rail timing together.
Planning board
LHR - HND is the first comparison, but nearby UK departure airports can shift the total.
Ginza, Shinjuku, Osaka, and rail bases
Comfort matters more than tiny fare gaps
Nearby country boards
India routes need baggage, layover, and late-arrival hotel strategy checked before price alone.
Singapore is a strong stopover when Changi timing, hotel check-in, and recovery nights are planned together.
Thailand trips need airport, river, island-transfer, and first-night hotel planning on the same board.
Vietnam is best planned with city order, internal flights, and first-night transfers visible before checkout.