Gatwick Airport is the international airport that is further out from town than Heathrow. It took us 45 minutes by tour bus to get to there from our hotel.
From overseas, you will most likely arrive at Heathrow airport (west of London) or at Gatwick (south of London).
Departure From London
This picture was taken at the SINGAPORE AIRLINES COUNTER, HEATHROW AIRPORT prior to my departure for Singapore by SIA.