Dunno about the summer, but to follow up on my experiences trying to book something for the Easter hols —
My only possible 'window' was between Fri 14th/Sunday 23rd April, and looking to get to a little place I know in Southern Spain. Shannon/Malaga (but
not Dublin/Malaga) became available on Ryanair, so I tried that. Only possibility was Sat 15th/Sat 22nd — at a cost of €2,500 + €70 credit card charge for the seven of us...
I then spent the best part of an evening trawling every goddamn 'no-frills' carrier you could think of — and some more besides! ([broken link removed] website is great, for those purposes). Checked out Shannon-or-anywhere/Malaga-or-anywhere
via Stansted/Gatwick/Glasgow/Birmingham/Leeds/Belfast/Barcelona/Frankfurt/Warsaw (I kid you not!) — no better... Then tried Expedia and Opodo, which showed something half-interesting with Iberia... aha! (I'd already tried Spanair/Futura, but no joy)
Finally booked direct with Iberia — and for
less then Opodo quoted for the same flights! — seven round trips Dublin/Madrid/Malaga (admittedly with a Malaga return departure at 6.35 a.m...
) for €1,390.32.
That's <€100 a head each way, bang in the middle of the Easter hols...
Moral of the story being — don't presume that Ryanair and their ilk will necessarily
always provide the best deal!