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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.
The findings show that fares can actually fall and then rise a number of times during the period leading up to a flight. The price of a Ryanair flight from London to Rome in the middle of April, for example, fell on six separate occasions in the six weeks before departure.