A Which? Travel investigation found surcharges were commonplace for phone bookings, with firms looking to direct business online.
According to Which?, Ryanair and Tui charge an additional £20 when booking by phone, easyJet £15 and British Airways £10.
Jet2.com was the only airline investigated by Which? that did not apply a phone bookings surcharge.
Rory Boland, editor Which? Travel editor, said: “Not all customers are comfortable booking online, and they should not be penalised for booking over the phone.
