The additions amount to "thousands" of additional seats across 22 routes flying from nine of the airline and operator's 14 UK bases.
Most of the extra flights are in April and October to meet early and late season demand, although there are a handful in May and July.
Destinations gaining extra flights include Majorca and Menorca in the Balearics, as well as several Greek islands and two Italian city favourites.
The additional seats are available from Birmingham, Bristol, East Midlands, Edinburgh, Glasgow, Leeds Bradford, Liverpool, Manchester and Stansted airports.
