So this is hard because not sure of the full picture. Whats the context?
You are walking to the airport and want a girl on the way? You are at the airport and want to wander of for some fun?
Can you not just get a cab to central luton and the much higher choices?
Are you travelling to Luton, through, say Milton Keynes, which is rich with choice?
Are you staying at one of the hotels nearby and maybe get an outcall?
In answer to your question, I do not know any girls, who are within walking distance of the airport, sorry.
However, with a bit more context I might be able to help