The move will affect trips to Greece, Croatia, Cyprus, Italy, Malta and Spain, among others.
It comes amid speculation the UK government will delay lifting the UK’s remaining Covid restrictions, which could impact international travel.
All holidays to Zante departing up to and on 28 June have been cancelled.
All departures to Aruba, Croatia, Cyprus, Greece, Italy, Jamaica, Malta, Spain and Tui lakes and mountains destinations, meanwhile, have been cancelled up to and on 4 July.
Holidays departing up to and on 11 July to Bulgaria, Cape Verde, Costa Rica, the Dominican Republic, Egypt, Mexico, Morocco, Tunisia and Turkey have also been pulled by Tui.
