The companies will add more flights, more holidays and new destinations for next summer from Glasgow, East Midlands and Bristol airports, with an additional aircraft coming into operation at each of the three bases to support the extension.
The airline and operator have added new Girona services from Glasgow, Malaga and Chania from Bristol and Santorini from East Midlands. Overall, the companies will offer a choice of 52 destinations from their 10 UK bases next summer.
The brands will operate to a total of 28 destinations from Glasgow and 32 from East Midlands and Bristol.
Steve Heapy, chief executive of Jet2.com and Jet2holidays, said the companies are experiencing strong demand "across all seasons".
"We always knew that when international travel returned to normal, customers and independent travel agents would respond by flocking to book our award-winning flights and holidays," he added.
"Such an expansion would not be possible without customers choosing to travel with us in huge numbers, so I would like to sincerely thank our customers and independent travel agent partners for their continued support.
"I can promise them that our unwavering focus will continue to be on delivering the VIP customer service that has made such a swift and significant impact."