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On most airlines, flights open up for sale 331 days in advance. That is the earliest you can book a flight â about 11 months in advance. We found that for about four months from that time, domestic fares tended to stay pretty steady, and pretty high.
What's more, researchers found that average ticket prices were fairly flat during the window of time 50 to 100 days before departure. In other words, the best bet is to book 50 to 100 days beforehand: Tickets purchased during that period were $85 cheaper than the overall average for all domestic flight prices ($495.55).