British Airways is currently offering £15 off flights to Malta. However, you need to book by midnight on 7 March 2014.
You can book here (enter the British Airways discount code EURPOFFERMAR into the “promotion code” box). The discount applies to travel until 12 April – given that British Airways does not begin flying to Malta until 30 March, that gives you a fairly narrow window.
Full terms and conditions for this British Airways discount code are here, but the other condition is that the booking must be for £100 or more. This will almost certainly be the case with a BA return flight to Malta.