Under FivesChildren under 5 travel free at any time on London buses, the tube, trams, Docklands Light Railway (DLR), and London Overground (London trains) when accompanied by an adult with a valid ticket.
Zip is the name for Oyster photocards for under-18s that allows them to travel for free or a discounted rate. There is a £10 non-refundable application fee for each Zip Oyster photocard.
5-10 yearsBuses and Trams
All children aged 5-10 years can travel for free anywhere at any time without a ticket or Oyster Photocard.
Tube, DLR, and London Overground
Up to 4 children accompanying an adult who has a valid ticket or Oyster card can travel for free without a ticket or Oyster photocard. Unaccompanied 5-10 year olds can travel free if they have a 5-10 Oyster photocard but I wouldn't recommend letting this age group travel alone in London. If they do not have a valid Oyster photocard, they must pay the full adult fare on National Rail services.
11-15 yearsAll 11-15 year olds need an Oyster photocard to travel free on buses and trams. They must also touch in (touch their Oyster photocard on a reader) as they board a bus or at the tram stop before boarding to avoid a penalty fare.
11-15 years olds can travel off-peak on the tube, DLR, and London Overground for a maximum of £1.30 a day with an Oyster photocard.