The early release comes following a reported increase in demand from customers looking for summer city getaways.
With flights and holidays on sale from Birmingham, Glasgow, Leeds Bradford, Manchester and Newcastle airports, the companies will be making further announcements about their summer 2023 city breaks programme over the coming weeks.
This includes further UK bases to go on sale with leisure city destinations for summer 2023 and additional destinations for the bases already on sale.
Customers can choose from a flight-only option with Jet2 or an Atol-protected package holiday with Jet2CityBreaks.
Steve Heapy, chief executive of Jet2.com and Jet2holidays, said feedback from customers and independent travel agents "is telling us that people want something to look forward to more than ever before".
"As the UK’s largest operator of European city breaks, our selection of city breaks for summer 23 offers lots of choice and flexibility," he added.
"With more destinations still to go on sale, there will be an even more to pick from, and we look forward to revealing further details of the exciting programme soon."
The new programme includes a two-times weekly service to Athens, Barcelona and Venice from Birmingham airport, as well as four-times weekly flights to Rome and additional services to Pisa.
Flights and city breaks are also now on sale to Rome from Glasgow with up to two-weekly services to the Italian capital.
Three city break destinations – Barcelona, Rome and Pisa – are on sale from Leeds Bradford airport and Athens, Barcelona, Rome, Pisa and Venice are on sale for 2023 from Manchester.
City getaways are also available to book to Rome from Newcastle with up to two-weekly services.
