Hey!
Getting to London City Airport by train is pretty easy. If you’re starting from central London, you can catch the Docklands Light Railway (DLR) from either Bank or Stratford Station. Both stations offer a direct route to the airport, so you won’t need to change trains.
From Bank Station, just hop on the DLR there, and it’ll take you straight to the airport. If you’re starting at Stratford Station, you can do the same; just board the DLR and it’ll get you to the airport directly.
For tickets, you can use your Oyster card or pay with contactless, and you’re good to go. The journey usually takes about 20-30 minutes, depending on where you’re starting from and how long you have to wait for the train.
Hope this helps and have a great trip!