I will be flying to Brussels in mid-September and I was wondering how far (or soon) out from that time should I book my flight to find the cheapest fares? I've heard 6 months (though its only under 5 months now), I've heard 2-3 months, some have said right before, but that is risking it. I don't care if I have to make two stopovers or more to save money, I just want to find the cheapest way to fly there. Any ideas on when to book? Thank you!