Luton Airport is 51km from central London.
Taxi - taxis can be hired outside the airport building.
Bus - you can catch buses to a range of destinations, including central London, from right outside the terminal building. It's best to book in advance to ensure your seat is reserved and to get the best price available.
Train - Luton Airport Parkway station is served by frequent trains to central London, Sussex and the Midlands. A shuttle bus takes travelers between the airport and the station, and the journey takes around 10 minutes; you can buy a shuttle ticket from the driver or include the fare in your train ticket if you have purchased it in advance. Train tickets are for sale at the Onward Travel Centre in Arrivals, and can also be purchased online or from a ticket machine near the shuttle stop.
Car rental - there's a 24-hour car hire reception at the Onward Travel Centre in Arrivals. From there, take the 24/7 courtesy shuttle bus to the car hire center, where you'll find half a dozen well-known companies offering their services.