When people ask me how far in advance they should book a flight to get the best price, I tell them that three months out seems to be (rather loosely) the best time, but that they should start looking as soon as they know their itinerary.
The New York Times Practical Traveler says that recent research suggests the sweet spot is more like six weeks out. But the Times’ own research suggests that’s way wrong and the best fares are had about 24 weeks out.
Throw in volatile fuel prices and some economic uncertainties and it gets even more unpredictable. One thing is clear: if you can find an affordable fare right now for summer travel, buy it.