it depends on many things like where you are going to and from, what airport you fly out of. If your airport is a hub for a certain airline then that is usually who has the cheapest tickets. otherwise you just have to hunt around. Check the major airlines websites for specials. You can save a little money on discount sites but they have long layovers and switch airlines alot, which will amount to a much larger chance of things getting fucked up, i.e. lost luggage ect. Personally I'd take a more expensive direct flight and pay more.
the only people for me are the mad ones, the ones who are mad to live, mad to talk, mad to be saved, desirous of everything at the same time, the ones who never yawn or say a commonplace things, but burn like fabulous roman candles exploding like spiders across the stars and in the middle you see the blue center light pop and everybody goes "AWWW!"