Fares can change significantly in just a few hours. One Delta flight from New York to Los Angeles jumped from $ 755 to $1,143 from a Friday to Saturday in late April, then fell to $ 718 on Sunday. The flight was one of a dozen the Associated Press followed over three months for a vacation between July 16 and 22. The number one finding: avoid booking tickets on weekends. It’s the most expensive time to buy.

　　There’s no way to guarantee the best fare. But before booking, travelers should pay attention to this additional advice:

　　Book on Tuesday, Wednesday and Thursday. That’s when airlines most often offer special sales.

　　Buy in advance, but not too early.

　　The best time is four to six weeks before traveling. In general, prices for any given flight are highest eight to ten weeks and two to three weeks in advance.

　　Make use of social media.

　　Airlines are giving more benefits to travelers who interact with them on Twitter and Facebook. But those specials are often gone within hours.

　　Choose the stable or the lowest? The fares of some so-called discount airlines, such as JetBlue, Air-Tran, Southwest and Frontier, are less changeable than other airlines, so you can feel more confident that the price will stay the same. But the fares aren’t always the lowest.

　　In all, there’s no way to guarantee the best fare, but researching different airlines’ fares can be the only way to get a good deal.

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