Approximately 420,000 people have booked flights from Heathrow Airport this weekend.
This is according to estimates from ABTA – The Travel Association, which predicts that a further 245,500 people will fly from Gatwick, 147,500 from Stansted and 72,500 from Luton over the August bank holiday.
Hundreds of thousands of others will fly from regional airports, with Manchester, Birmingham and Nottingham East Midlands set to be the busiest.
It is thought that 120,000 passengers in Scotland will fly from Edinburgh, Glasgow or Aberdeen.
ABTA chairman John McEwan said that large numbers of people were viewing the bank holiday as a "last ditch attempt" to get some guaranteed sunshine.
"Obviously people have been holding onto their money until they are sure they have enough to go away with and as a result we have seen a surge in late bookings," he commented.
In total, ABTA estimates that 1.9 million Brits will travel abroad between today (August 28th) and Sunday.
ABTA announced yesterday that it wanted people to write to their MPs and sign an online No.10 e-petition aimed at stopping an increase in taxes on long haul flights later this year.