Book your flights about two months in advance if you can - airlines set rates higher farter out than that and then raise them again as the departure date draws nearer. Try to book your flights at the beginning of the week, on a Monday or a Tuesday, as this is typically when the rates are lower. You might find some success using the same types of online travel agencies as you use to find your hotel room. Some will even bundle your flight and your sleeping accommodations into a rate that's cheaper than purchasing them both separately.
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