British Airways is hiking summer capacity with more than 90,000 extra seats to Spain, Greece and Turkey.
The new services from Heathrow are in response to “overwhelming” interest from customers on ba.com.
The 26 additional weekly frequencies will include destinations such as Corfu, Kos, Paphos, Rhodes, Lanzarote, Tenerife and Bodrum.
The new flights to Greece and the Canary Islands will be available to book from today (Tuesday) for travel between June 21 and September 5.
Bodrum in Turkey will also be available to fly to from July 18.
Fares lead in at £49 each way to Lanzarote.
The move come ahead of the government’s next decision on its traffic light list of destinations for overseas travel in three weeks.
All the expanded BA routes are to countries currently in the amber category requiring quarantine on return to England.
BA networks and alliances director Neil Chernoff said: “It’s clear Britons are hoping that their favourite destinations will be open by the time summer comes.
“We want to provide them with access to book seats to the places they love to help them get away, and trust that if they can’t travel, we will be there for them with incredible flexibility to make changes to their bookings.”