Manchester will see an additional eight flights a week to seven destinations, with Birmingham another six a week to six destinations.
The new flights will also permit more 10 and 11-night holidays from both airports to Greece, Palma, Cyprus, and Turkey.
More capacity is being put into Turkey following the devaluation of the Turkish lira, with Tui operating a large programme from both airports, with 15 flights a week from Birmingham and 21 from Manchester.
From Birmingham, flights to Dalaman increase to eight a week and will operate daily to Antalya. Manchester will see 11 a week to Dalaman and 10 a week to Antalya.
Richard Sofer, Tui’s commercial and business development director, said: “To ensure we’re offering maximum flexibility and choice we’ve increased the number of flights to our most popular summer destinations with extra based aircraft at both Birmingham and Manchester airport.
“We’re delighted that international travel is bouncing back and the forecast for this summer’s holiday season is bright.”