The largest is Heathrow . It has four large terminals, two tube stations on the Piccadilly Line, and a railway link to Padington Station. It is the world's busiest international airport with the largest variety of airlines and flights. Taxis are expensive. Gatwick is the city's second airport.
Many charter flights leave from here as well as long haul.
This has two terminals and its own railway station. It is reached by train from Victoria Station. Stanstead is the third airport and is a train ride away from Liverpool Street Station. Many cheaper airlines use this airport. City Airport is the fourth and smallest airport.