Ryanair has said it will waive its flight change fee for all customers who book to travel in July and August of this year.
The airline said this will allow people to book their summer holidays with peace of mind in case their travel plans change.
Ryanair has said it plans to operate over 1,000 daily flights from July 1.
The airline said that from tomorrow, customers who book to travel in July and August will be able to move their flights for free to travel until December 31, 2020.
It added that the flight date change will only apply to the route customers have already booked and trips must be completed before the 2020 year end.
Meanwhile, travel corridors allowing unrestricted movement between Britain and some other countries will open from June 29, a UK tourism lobby group said today, citing assurances it said it received from senior government sources.
Britain introduced a 14-day quarantine for international arrivals yesterday.
This was despite warnings from airlines, airports and others that the measure could lead to more job losses just when they were hoping to launch a recovery from Covid-19.
Quash Quarantine, representing 500 travel and hospitality companies, said it had been told privately that travel corridors, a means of allowing quarantine-free trips, would be in place later this month.
UK government ministers have publicly said they are considering travel corridors, or so-called "air bridges" with countries with low infection rates, but there have not been any formal deals so far.
Airlines want the quarantine rule scrapped altogether.
British Airways has teamed up with low-cost rivals Ryanair and EasyJet with a plan to launch legal action to try to overturn it, and legal papers could be filed today.
Quash Quarantine said it had not ruled out pursuing legal action itself.
"We are still considering our options regarding legal action, including whether to join BA's claim or launch our own action, but would prefer that 29th June is confirmed as soon as possible for the start of travel corridors," Quash Quarantine's spokesman Paul Charles said.
Popular holiday destinations for British tourists include Portugal, Spain, France, Greece and Italy.