And to make matters worse, families won't be able to cancel their booking without paying a penalty, which could mean extra fees adding up into the hundreds.
The additional fee, which could be up to eight per cent, is an extra cost that can be legally applied thanks to the Package Travel and Linked Travel Arrangements Regulations 2018.
According to MoneySaving Expert, this surcharge is part of the regulation to cover price increases such exchange rates, fuel costs or taxes.
However, it could lead to a package holiday booked before the end of March costing hundreds of pounds more – on top of the fees already paid – if the additional charges are passed onto customers.
It all depends on what's written into the terms and conditions of your holiday.
A number of package holiday providers confirmed they would not increase prices after Brexit.
British Airways Holidays, On the Beach and TUI were some of the firms who said any extra costs would not be passed on.
A TUI spokesperson told Sun Online Travel: "No matter what happens with Brexit, we will not increase the price of our holidays after they have been booked. Customers can continue to book TUI and First Choice holidays with full confidence."
Teletext Holidays, easyJet Holidays, Jet2 Holidays, Lastminute.com, Loveholidays and Virgin Holidays have not ruled out additional charges according to Money Saving Expert.
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However, many of them confirmed they had no current plans to charge customers extra.
A Thomas Cook spokesperson told Sun Online Travel they had a "Brexit Price Guarantee" in place for Brits.
Lastminute.com advised Brits to check their holidays are ATOL protected but that they could be affected by "changes in customer price" after the UK leaves the EU.
Money Saving Expert's news and features editor Steve Nowottny said: "It's good to see some firms are tackling customers' concern head-on by guaranteeing they won't levy surcharges.
"If you are booking a holiday in the next few weeks and are concerned about the implications of Brexit, one option is to go with a firm that has a 'Brexit promise' – though make sure you fully weigh up the pros and cons and factor in any additional cost."
Some package providers are offering a "Brexit promise" when booking which means prices will not go up if booked before March 31.
Package holiday providers who try to charge more than the eight per cent, although rare, must offer customers the chance to apply for a full refund without paying a penalty fee.
Providers must also stipulate the reason behind the additional cost, and inform customers at least 20 days before travelling.
Marin Lewis explained how to Brexit-proof your travel plans, Sun Online Travel previously reported.
He advised Brits to check their passports and travel insurance validity as well as buy currency ahead of time.
A no-deal Brexit, however, could see five million plane tickets cancelled with limited replacement flights.
Sun Online Travel has contacted the holiday package providers mentioned for additional comment.
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