Use Google to Track and Compare Flight Plans to look for cheap flights/ historical comparison, etc.
Your odds improve if you buy on the weekend.
Sunday is the best day to find low fares. This is a departure from the conventional wisdom of recent years, when Tuesday was considered the best bet.
When searching for the lowest fare, don’t give up on Tuesdays. It’s the day with the most frequent price drops, leaving the door open for good deals.
21% of the price drops it has recorded happened on Tuesday and 19% on Wednesday
The lowest prices for domestic tickets (is) at 42 days before departure
The average purchase date was just over one month before departure. By then prices have started their climb.
The best time to buy for Thanksgiving was Oct. 10. The sweet spot for Christmas was even earlier, Oct. 8.
International ticket prices didn’t fluctuate much between 10 months and three months before departure.