Budget airline Ryanair does not charge a rebooking fee for flights in July and August.
In this way, the Irish prizefighter hopes to persuade people who are still in doubt about a holiday abroad due to the coronavirus, to book a flight.
If travellers decide to postpone their summer vacation, they can still fly to the same destination later in the year.
The arrangement applies to tickets booked from Wednesday. Ryanair will fly again from July 1.
More and more European countries are allowing tourists again.
Tourism is an essential economic sector in southern European countries such as Spain, Italy and Greece. Spain will only open its borders on July 1.