London has five airports in or near the city - Heathrow, Gatwick, London City Airport, Stansted and Luton. Heathrow is twenty-four kilometres from the city centre.
The city has eight big train stations, too. You can catch a train from London to Paris or Brussels now. Many people live outside London and come into the city for work every day. Children know about King's Cross station because it is the train station in the Harry Potter books.
There are a lot of cars in London, and journeys can take a very long time at the wrong time of day. But the city is famous for its black taxis and red buses. You can see some of London's famous red buses today and there are other buses, too.
You can move across London on the Underground, too. Londoners also call these underground trains "the Tube". The London Underground is the oldest in the world. People first used it in 1863.
You can, of course, walk round London!