I have mentioned Kayak.Kayak.com before as one of my favorite sites to use for booking air travel. Kayak sent out a reminder of how to save money booking holiday travel that is worth passing along. If you specify that your dates are flexible (you must create an account to use this feature) you can bring up a graph that will help you pick the best day to fly.

It pays to know what others are paying. After doing a flight search, check the airfare history for a desired route by clicking on Chart View on the flight results page. Kayak’s Best Fare Trend Graph charts pricing for city/date pairs found by Kayak.com users over the past 90 days.

This chart will:

1. Let you know if the deal you are looking at is a good deal
2. Let you know if you might get a better deal by moving your trip a few days