The airline will operate eight aircraft from the Northern Irish hub this summer and launch two new routes to Rhodes and Antalya.
The new additions came after the company celebrated carrying 70 million passengers to and from Belfast.
To mark the occasion, the airline surprised a family flying from the airport to Lyon with free return flights.
Ali Gayward, easyJet’s UK country manager, said: "We are so proud to be in Belfast marking a key milestone for us as today we celebrate flying 70 million passengers from Belfast International airport.
