Capacity to Greece by Jet2.com and Jet2holidays is being raised to 1.3 million seats for next summer.
Three new routes have been introduced – Bristol-Chania, East Midlands-Santorini and Stansted-Athens, with the Greek capital confirmed as a year-round destination.
Frequency is increased to destinations such as Corfu, Rhodes and Skiathos as part of the programme now on sale.
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The expansion after a record number of flights and holidays this summer includes an extension of the season to include Easter trips to Rhodes and Halkidiki in April 2023.
Chief executive Steve Heapy is in Greece this week to meet hoteliers, industry representatives and government to detail the growth plans.
He will visit Corfu, Zante, Chania, Heraklion, Rhodes and Kos to highlight how the travel group is continuing to grow long-term partnerships with hoteliers and the industry in Greece.
Heapy said: “We have continued to invest heavily in Greece, and the fantastic partnerships we have in place are central to our continued success.
“I am looking forward to meeting current and future partners and telling them all about our award-winning business, how we have expanded enormously in Greece and how we are here to stay, building long-term partnerships as we succeed.”