We were in exactly the same position as you, accommodation booked for August, only flights needed. Annoyingly for us Thomas Cook have stopped their flights from our local airport so I have been scouting round the flight sites for a couple of months, prices just seem to be rising. I took the plunge last weekend and booked Jet2 flights from Leeds (we live in Southampton), as they seemed reasonable and I just couldn't face the flight times and a packed Gatwick. Our in laws live 10 mins from Leeds airport so we're going to combine the holiday with a trip to see the family.
BTW we have paid around £1200 for 4 of us, inc meals, 2 bags and a movie for the kids.
It's very stressful searching around for flights and seeing them rise week to week.
We're happy now :-)
Helise x