The deal is a major development for the low cost carrier following the launch of its EasyJet Holidays offshoot last summer and will see products from 50 markets throughout Europe and North Africa available via EasyJet.com.
Destination-based products sold via the Viator white label will include destination tours, expeditions, museum tickets and other activities.
The move will increase competition between Viator and its growing European opponent Isango, which signed a similar partnership with EasyJet rival Ryanair earlier this year.
EasyJet’s partnership manager Leo Purcell said: “Viator and easyJet share similar philosophies when it comes to quality for our customers.”
“We are delighted to be working with an experienced company like Viator to provide our customers with the ability to pre-book the activities they want to experience in their destination.”
The deal will give the 13-year-old Viator a major footprint in the European marketplace and further indicates the mushrooming demand for online destination product and content.
Viator founder and chairman Rod Cuthbert said: “Researching and purchasing destination activities before travel is easier than ever, and it’s never been more important, as more and more travellers are already doing so, leading to limited availability at many popular attractions.”