Tui UK and Ireland is extending the cancellation of all beach holidays until June 30 and Marella Cruises’ sailings up to July 30.
The UK’s biggest travel firm blamed on-going Covid-19 travel restrictions for the decision.
People whose bookings are affected will receive a refund credit.
They will also get an incentive of up to 20%, or can request a cash refund via an online form on the Tui website if they have a package holiday booking.
“All customers should receive their refund credit within four weeks before their original departure date; customers who booked on the Tui or First Choice website or via the Tui or First Choice app can amend their booking with their incentive themselves via Manage my Booking,” the operator said.
“With so much uncertainty around when travel will be able to recommence, customers due to travel before the end of August have the opportunity to amend their holiday for free so they don’t have to pay until closer to their new departure date.”