Main point
The biggest trap for travellers flying from London Luton is misunderstanding the train stations. The mainline train from London St Pancras takes you to 'Luton Airport Parkway' station. This station is NOT the airport terminal; it is over a mile away. To cover this final mile, you must ride the Luton DART, a futuristic automated cable car that takes 4 minutes to shuttle you from the Parkway station directly to the airport terminal.