Jet2.com and Jet2holidays are adding over 100,000 extra seats this winter following the collapse of rival Monarch.
The airline and its tour operator arm say they have seen a sharp rise in demand for flights from Birmingham, Manchester, and Leeds Bradford.
It is adding 55,000 extra seats from Birmingham, 45,000 from Manchester Airport and, with three extra weekly flights to Tenerife, an extra 15,000 seats from Leeds.
Extra flights have been added to Alicante, Faro, Gran Canaria, Lanzarote, Malaga, Majorca, Rome and Tenerife.
It means Jet2 now has more than 2.5 million seats on sale, a 54% growth in capacity year-on-year.
On the back of strong demand over the half-term holidays, there will be 14 extra services from London Stansted representing more than 5,000 seats.
These additional services will operate to Tenerife, Lanzarote, Alicante, Majorca and Faro.
Steve Heapy, CEO of Jet2.com and Jet2holidays, said: “We won’t be stopping at these winter flights, so keep an eye out for further announcements about additional Summer 18 capacity very soon.”