Independent travel websites FareCompare.com and SmarterTravel.com, consulting with reps from Travelocity and Expedia, agree that Tuesdays are best for booking airfare. Airlines release the week's deals on Tuesday morning and other airlines try to match those deals throughout the day, giving you more options.
After the Tuesday sales are released, you can still find low prices hanging around on Wednesdays before the deals are pulled by the airlines on Thursdays and Fridays.
After airfares are raised over the weekends, they sometimes go down on Monday, especially as traffic on travel booking websites diminishes. You may catch a good deal on Monday night, especially if one of the airlines has released a sale early.
