It is Jet2’s earliest-ever launch of a summer programme, with trips available for agents to book from all 13 of its UK bases.
Jet2's programme includes six new routes, with three of them – Birmingham-Bergerac, Edinburgh-Skiathos and Manchester-Bergerac – being exclusive to the operator.
Manchester, meanwhile, gains a Jersey service, while Jet2 will now offer Costa de Almeria and La Palma from Stansted – the latter being a Jet2 first for the airport.
The operator said it would go on sale with city breaks “soon”.
Both Jet2 and Tui are keen to attract early business amid worries about the economy. Jet2 is offering consumers £60pp deposits and interest-free monthly payments.
Steve Heapy, Jet2.com and Jet2holidays chief executive, said: “We know customers are looking to book their summer 2027 holidays in advance so they can get the best choice of hotels, rooms and dates.
"In response to customers wanting to lock in their getaways, we have responded by putting our summer sun programme on sale for 2027 before anyone else, giving them the chance to get that holiday booked in.
"We are looking ahead to a very successful summer 2027 and will be making further exciting announcements about the programme very soon.”
For 2027, Manchester will offer the greatest range of Jet2 flights, with 59 destinations, followed by Birmingham with 57, Stansted with 48 and Leeds Bradford with 45.