Check out the website
Luton Airport
That says:-
The 8 scheduled carriers that operate at London Luton Airport are as follows:
* easyJet
* Helios Airways
* Ryanair
* Aer Arann
* Monarch Scheduled
* BA CitiExpress
* Wizz Air
* flyBe
and that the top 10 destinations (in pax numbers) were
(1) Glasgow
(2) Edinburgh
(3) Amsterdam
(4) Belfast
(5) Dublin
(6) Geneva
(7) Malaga
(8) Paris
(9) Nice
(10) Alicante