London Buses operates a bus from Lewisham to Barking every 5 minutes. Tickets cost $3 and the journey takes 26 min. Alternatively, Dockland Light Railway (DLR) operates a train from Lewisham to Barking 3 times a day. Tickets cost $4 - $7 and the journey takes 35 min.
From Lewisham Centre line 54 bus to Woolwich, Vincent Road Woolwich Arsenal. 26 min £2. From Lewisham DLR Station train to Gallions Reach DLR Station. 35 min £4. From Lewisham taxi to Barking. 18 min £43. From Lewisham drive to Barking. 18 min £1. From Lewisham Uber to Barking. 18 min £17. From Lewisham walk to Barking. 2 h 40 min.