Flights from Heathrow to Bangkok can fly as far north as Siberia on the way and they can also fly as far south as the Alps in Europe.
Delta uses Heathrow terminal T4.
British Airways, Qantas Airways, EVA, and Thai Airways fly from LHR to BKK in just over 11 hours, and the return trip takes about 12 hours 45 minutes.
T3.
There are various places you can fly to from Heathrow Terminal 3 such as Chicago USA, Amman, Oslo and Vancouver Canada. It is an International terminal that help you in your travel destination.
Thai Airways International fly to a number of destinations around the world. They fly to China, India, Australia, Belgium, France, Spain, Italy, England and the United States.
Thomson Airways fly from Terminal 2 to Alicante.
Numerous airlines fly from Heathrow to Austrailia, from different terminals.
Yes
T5.
British Airways (BA) typically flies into Terminal 5 at London Heathrow Airport (LHR) from Dublin Airport (DUB). However, it's always best to check your flight details prior to departure, as terminal assignments can change.
Delta fly in and out of Terminal 4 at London Heathrow. See related link for more information.