London, United Kingdom - Heathrow (LHR)

London, United Kingdom - Heathrow (LHR)

In Brief: The UK's (and Europe's) biggest passenger airport, Heathrow is the big daddy in town, with huge numbers of flights to points near and far. Few low-cost airlines fly in and out of Heathrow; in fact, a few Aer Lingus and Clickair routes pretty much account sew up the category. Heathrow lies 24 km (15 miles) to the west of London.

Transportation: The cheapest way to Heathrow is via the Tube, which takes about a half hour (and costs just £4). The Heathrow Express train, from Heathrow to London Paddington, begins at £14.50 for a one-way journey. National Express bus line runs just £4 for a 45-minute journey to Victoria Coach Station.