The operator said from today (15 January) it was contacting customers with holidays booked to let them know.
It is due to the ongoing restrictions on international travel as a result of the current lockdown.
The holiday firm will provide all customers with impacted bookings some options to select from. Customers can choose to change their holiday online. Or they can opt to receive an easyJet Holidays credit to their online account for a future holiday when they are ready to make another booking either immediately or within the next 12 months, although the holiday can take place beyond this.
