The summer (June - August) are generally peak tourist season in Western Europe and the flight reservations are comparatively costlier. I would suggest you to find and subscribe to some flight deal providers, you might get one you are searching.
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According to our recent twitter poll, 86% of Brits don’t know the best time to book.Just how many weeks out you should book varies per destination, i.e. the best time to book flights to Malaga is seven weeks in advance.