Monarch also fly to Alicante.
Where are you going on the Costa Blanca? If you're south of Alicante then Murcia might be a good (and possibly cheaper) alternative. If you're going a bit north then Valencia quite often comes up cheaper with more availability
Have a look at Murcia too. Alicante is about 45-60 mins from Torrevieja (sp) and Murcia is about 30, I think. This may not matter if his friend is picking him up