You can travel to London by air or train. When travelling in London, you can use public transport, including the Underground (known as the Tube), Elizabeth Line, Buses, the Docklands Light Railway, London River Services, and the London Overground. You can also use taxi services, including black cabs, Uber, etc.
Travelling to London by air
The London airport system is one of the busiest in the world. There are six airports in London, namely Heathrow, Gatwick, Stansted, Luton, London City, and Southend (in order of size).
Travelling to London by train
If you are in UK or Europe, you can travel to London by train from within UK or by EuroStar from Europe.
Public transport in London
London has one of the largest public transport networks in the world, with integrated underground, train, and bus systems spanning the city.

When using public transport in London, you can pay using a Contactless bank card or Oyster cards. Oyster cards can be bought from underground stations.
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(Contactless card payment and Oyster card. Source: Transport for London)