Which? found that those booking a summer 2023 package holiday between November 1, 2022, and January 3 of this year would have paid 19 per cent more on average than last year.
When Which? compared the average prices for a week's holiday in six popular destinations - Spain, Greece, Portugal, Italy, Turkey and Cyprus - it found Greece had seen the steepest rises, followed by Italy.
A seven-night break in Greece costs on average 30 per cent more than in 2022, with an average price tag of £867 per person for summer 2023.
According to data from Travelsupermarket.com, the average package holiday cost in Italy has risen by 23 per cent to £757, while the price of a holiday in Turkey has climbed by 21 per cent to £799.
Meanwhile, the cost of a package break in Spain has soared by 20 per cent to £693 – but despite the significant rise in average costs, it still offers the cheapest getaways, Which? notes.
At the lower end of the scale, the price of a package getaway to Cyprus has risen by 15 per cent to £809.
However, of the six popular destinations the consumer champion looked at, Portugal had the smallest rises in price, with the cost of a week’s package holiday rising by seven per cent, on average, to £705.