The low-cost carrier is adding 200,000 seats with the new routes and will now operate to a total of 33 destinations.
The expansion sees Jet2.com raising its capacity by 60% to more than 1.4 million seats for its second summer of operations from Stansted.
In addition to the new destinations, more weekly services are being operated to a number of destinations, including Turkey, Gran Canaria, Menorca, Girona, Paphos, Dubrovnik and Verona.
Ten aircraft will operate from the airport next summer – three more than this year.
Steve Heapy, chief executive said: “We have experienced a fabulous response to our flights and holidays from independent travel agents since putting our summer ‘18 programme on sale from Stansted airport.
“With 33 destinations on sale, in just our second summer of operations, this reflects the confidence we have at our newest base – where our offer of real package holidays is making us a huge hit.”