London Luton Airport (previously called Luton International Airport) is an airport about 30 miles to the north-west of central London in the town of Luton, Bedfordshire. It is the fourth largest airport serving the London market after Heathrow, Gatwick and Stansted.

In 1990 the airport was renamed "London Luton Airport" in order to boost the profile of the airport in the eyes of foreign visitors, likely to be heading to London but not realising Luton was close. In 1991, Ryanair transferred its base of operations to Stansted, again resulting in the decline in the airport's importance in the British transport network. This trend was dramatically reversed later in the 90s with the introduction of charter flights for Airtours and new 'low cost' scheduled flights from Debonair and easyJet, the latter making Luton its hub. A new railway station, Luton Airport Parkway, has been built to serve the airport and provides services to London's St Pancras and to the north on the Midland Main Line, and also on Thameslink routes north to Bedford and south to St Albans, London, Wimbledon, Sutton, Gatwick Airport and Brighton. A free shuttle bus connects to the airport. The station is just over a mile from the airport terminal buildings, and passengers who incorrectly believe the station is within the airport should instead allow extra time.

Currently, Aer Arann, British Airways Citiexpress, Helios Airways, Swe Fly and low cost airlines Easyjet, Wizzair, FlyBe, Helvetica, Monarch Scheduled and Ryanair fly scheduled services to over 50 destinations from Luton. Britannia Airways First Choice Airlines, Thomas Cook Airlines, Sun Express and Monarch Airlines fly charter services from Luton. DHL and Streamline are amongst the more frequent operators of freight-only flights and expensive business jets represent a significant proportion of travelling visitors. A major extension to the new Terminal building was opened in July 2005 as airport passenger numbers grew to over 8 million.

In 2004 the airport management announced that they supported the government plans to expand the facilities to include a full-length runway, either on the current alignment, slightly south on the same alignment or at an angle to the present runway. Local campaign groups are fighting this expansion.