According to the Consumers' Association, parking at Heathrow can cost around £66 for a week if you book in advance. But turn up on the day and that £66 can hit £120. An 81.8% rise!
But if you want to save even more money, look to local private car parks. "Glasgow Airport's cheapest deal was nearly twice the price of Airparks, four miles away," Which? Travel discovered. However, not all independent parks are cheaper. Which? found good deals, for example, at Stansted, Luton and Birmingham airports.
Park - and pay lots
However depending on where you are, you don't have to pay anything at all. You could - though Which? Travel does not specifically endorse this - park in a safe private street. Admittedly many will be parking controlled. But not all. Then, take the train for a few short hops. Cost? Nada.
Be flexibleBut if you want the security of a car park, look at Airport Parking Shop, a specialist search website that compares prices online and includes around 100 car parks at more than 20 UK airports. Other sites like Essential Travel also offer deals, guaranteeing the best price, so they claim.
But do read the small print of any agreement, especially if it's a private park. If a flight is late, could you be charged an extra day if the plane come in after midnight, for example?