Uber:
An Uber driver will wait at least five minutes for a rider if no cancellation request has been submitted. Uber can cancel the ride after this waiting period and assess a cancellation fee. The waiting period is reduced to two minutes for uberPOOL users. The cancellation fee depends on the type of service requested, vehicle type, and city.
Lyft:
A Lyft driver will wait at least five minutes if the request hasn’t been canceled by the rider. After the five-minute window, Lyft can cancel the ride and charge the rider a fee. The waiting period is reduced to one minute if the rider uses the Shared ride option. This fee is dependent on location though most cities charge $10 if you don’t show up at the pickup spot.