Figures provided to London Assembly Member Caroline Pidgeon by Mayor Boris Johnson show more than 11 million passengers suffered delays of 15 minutes or longer last year.
Under Transport for London rules, any passenger delayed by at least 15 minutes is entitled to claim a refund for the cost of a single journey.
However the figures show just 412,713 people, 3% of those entitled, have done so.
Commenting on the Mayor’s figures, Pidgeon said: “It is bad enough to face severe tube delays, but people shouldn’t then miss out on the refunds they are entitled to.
“In a week where far too many people have already faced delays on the tube I would urge everyone to start claiming what they are entitled to.
“The Mayor and TfL will only start to really take delays seriously when they are hit financially by passengers claiming in full the refunds for their terrible journeys.”
