Airport parking is usually the most expensive option. So do you really need to park on-site? If this is the case (and convenience is undeniable) it's best to book early. Book flights in advance also save money and park the car.
Companies like airport parking deals or UK holiday parks actually have a special option of pre-booking lots of on-site parking at airports. Getting airport pavement markings is a good way to have organized parking at the airport.
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However, if booking in advance is not an option and you are looking for the best price, off-airport parking is definitely your best bet. Most UK airports already have options – and there are plenty of online airport parking websites that will do your search, as well as several airport parking comparison sites.
A search for "airport parking comparison" on any search engine returns a number of them. But of course, price isn't everything. You need to be sure that your car is properly maintained.
Therefore, it is best to look for a Park Mark Accredited company. Park Mark is operated by the British Parking Association and demonstrates that the company meets all the standards required for a safer parking system across the UK. "Park Sign" logo (blue shield with large white marker). This award and approval are given to a bright, safe area that the police inspect as safe from abuse.