Airports have been reported busy across the country this Christmas Eve as many people choose to get away for the festive season.
Around four million people are thought to be heading abroad to see in Christmas and the New Year.
Major engineering works will affect the West Coast main line for several days starting from Christmas Eve night.
According to the BBC, Heathrow is expecting 87,782 departing and 77,719 arriving passengers.
Heathrow chief operating officer Normand Boivin said: "With a huge number of passengers set to fly from Heathrow this Christmas, we are giving merry travellers a festive send-off as they embark on their holidays."
Cardiff Airport is expecting up to 20,000 people to fly out of Wales for hotter climates, with the most popular destinations thought to be the Canary Islands, Tunisia, Morocco, Dubai, Mexico and Cuba.
British Airways has 267 scheduled flights on Christmas Day, on which 37,000 turkey dinners will be served.
Airline Ryanair has also reported it will carry up to 3.5 million passengers between December 20 and January 6, a 20 per cent increase on last year.
