This from the Malta Airport website: http://gettinghere.maltairport.com/en/white-taxi.htm

Not sure if you are travelling as a couple or alone. If alone, you may want to consider one of the airport shuttle buses... or even one of the X bus routes which run from the airport.

We are going too in October but will either book a minibus transfer privately (there will be 4 adults in our party) or a private taxi (we usually pay no more than 35 EUR for the return journey) with Star Tourist based in Bugibba. We haven't been for a couple of years but those have been the prices over the last 6 years we travelled to Malta from Cyprus.

The hotels usually offer us a taxi at a cost of 50 EUR so you can see the difference in price!

there is taxi booth at Luqa and you pay them before you get in the taxi the prices are regulated in order that you don't get ripped off

As Shell mentioned it might work out just a cheap if not cheaper to book a shuttle transfer or a private transfer, I can also vouch for Star Tourist Services http://startouristservices.com reliable and good value.

I have also used this company recently http://ecabs.com.mt/

thanks all for the info i will check them out