Tuesday is predicted to be the most popular day of the year for booking winter-sun holidays.
A third of people (34%) are expected to take an overseas break over the winter, according to research commissioned by discount website MyVoucherCodes.co.uk.
Brexit fears have not discouraged people from travelling abroad, with an 8% increase this year compared to 2016, with 22 million planning on leaving the country in the coming months.
More than half (58%) are more likely to book a trip over Christmas than they were five years ago.
When questioned on the reasons for leaving the country, one in ten (8%) admitted that the pressure of hosting friends and family will drive them to book a getaway.
Cold weather and dark nights are the main drivers in people escaping the UK, with two-fifths (40%) citing it as the most important reason for booking holidays this week.
An average of £700 per person is spent on winter sun holidays, with one in five spending more than £1,000 each on trips abroad.
Two-thirds spend more money on winter sun holidays than the traditional summer holiday, with an average price difference of £217 per person.
Almost a third (28%) say peak season price hikes during summer school holidays puts them off travelling abroad at this time.
The most popular winter sun destinations are the Canary islands of Tenerife, Lanzarote and Gran Canaria followed by Florida.
Company managing director, Chris Reilly, said: “More Brits are flying to warmer climates over Christmas than ever before and spending more than they did in the summer.
“With over 76% of people booking holidays online nowadays, there are plenty of deals and offers to help keep more money in your pockets for those piña coladas.”