British Airways has made more than 35,000 seats available to book for less than £50 each way across the UK until September 2021.
Destinations included in the BA’s domestic network offer are Aberdeen, Belfast, Edinburgh, Newcastle and Newquay.
The carrier’s Cityflyer brand will operate routes from Belfast to Exeter, Glasgow, Leeds and Newquay from £32 each way.
The move comes after regional airline Stobart Air’s collapse last month. The carrier operated flights on behalf of Aer Lingus.
Customers who book before August 31 are able to exchange their booking for a voucher or move their dates without incurring a change fee.
Colm Lacy, BA’s chief commercial officer, said: “The last 18 months have been tough, with friends and relatives unable to see each other and many of us missing out on the chance to celebrate important landmarks and occasions with our loved ones.
“After a world-leading vaccination programme, the UK is re-opening. With travel dates stretching across summer, there’s plenty of choice and we look forward to welcoming people back to the skies.”