The Travelcard is a transport pass for London that gives you unlimited travel in London within certain zones. The prices vary according to number of zones you need to travel through. Central London is in zone 1. Travelcards are valid for 1 day, 7 days or 1 month.he Pay as you go Oyster card or a contactless card are the cheapest ways to pay for travel for a day if youâre in London for 1-5 days. (Â£6.40 per day for zones 1-2). If you really donât want to use an Oyster card or donât have a contactless card, the One Day Travelcard is the next best money-saving pass.