To make the money, customers must not book direct with the the online travel agents but instead go through a cashback site, which give money back on purchases made through their links.
For example, Quidco and Topcashback both offer 12 per cent cashback on sales with Expedia, meaning a family making a £400 hotel booking would get back £48.
The two sites offer cashback on a large number of airline and travel companies.
Topcashback, for example pays 2.5 per cent on Aer Lingus flights and 3.5 per cent on Ethihad holidays, as well as £7 back from Thomas Cook holidays.
Quidco offers 2.5 percent cashback on Emirates bookings, and £7.50 on British Airways long haul flights.
Before making any holiday bookings, travellers are urged to check whether they could get cashback on purchases.
Money is paid into a user’s account once the cashback is tracked and confirmed by the partner company.
The time frame to receive money back depends upon the individual company – with some firms faster at confirming transactions than others.
Cash can then be directly transferred to the user’s personal bank account.
The sites both offer cashback on a wide range of retailers across the high street, so before making any online purchase it’s worth checking if you can earn money on your purchase.