Deals often appear as Monday night rolls into Tuesday. For flights within the United States, other airlines might be matching a rival's bargain by Tuesday afternoon, while the process might take a day longer for overseas routes. But bargains can pop up on other days. And don't buy too soon, says George Hobica of Airfarewatchdog.com.
If the seating chart for the plane you want to fly on shows most seats empty, the airline might be about to cut its price. BestFares is one website that makes it easy to view seating as you shop. At some travel sites, you may need to go through the motions of buying a ticket -- stopping short of actually making the purchase -- before you get to see a seating chart.
