Details.
Buy 20 Cross River Single tickets for the price of 14 through the Thames Clippers Tickets or Uber apps. Each crossing costs £2.87, and the tickets must be used within 90 days of purchase. The saver applies only to single journeys between Rotherhithe or Greenland (Surrey Quays) and Canary Wharf piers, or between Barking Riverside and Woolwich (Royal Arsenal) piers. Children, concession and Travelcard discounts do not apply.