Germanwings
appears to offer direct flights between STN & MLA but, when you actually search for them, you'll find that the flights are via Cologne. Further, there aren't many days when you can actually get suitable flight connections. When you can, the flight time is around 6� hours and the fares are far from cheap.
According to the Stansted Airport website, the
only direct flights are with Air Malta:
http://www.stanstedairport.com/portal/page/STN %5EFlight+Information%5EDestinations+and+Airli nes/
For some sample dates I've just tried (Out Wed 15/10, return 22/10), the fares quoted are just �13 each way. Adding on taxes and charges brings the total return fare to �91.83.
http://www.airmalta.com/homepage?l=1
If you can't find anything suitable from Stansted, you're best option might be to to consider Ryanair's flights from Luton. For the same sample dates, their prices are �14.99 each way. Taxes and charges bring the total return fare to �73.08
http://www.ryanair.com/site/EN/
Chris