Pay as you go (paying only for the journeys you make) is the easiest way to pay for travel in London. You don't have to work out the cost of your journey in advance. You can pay as you go using contactless (card or device), an Oyster card or a Visitor Oyster card.
What is the easiest and cheapest way to travel around London using public transport?
1. Get an Oyster card. As you move around London you will spot locals tapping something against a yellow card reader at the underground turnstiles, on buses, trams, and even on the Thames Clipper Uber boat. This is an Oyster card, and it is an incredible 50% cheaper than buying single tickets or a paper travelcard.