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From Travel Strategies
Airfare 101: Find the Lowest Fares
Other than shifting around your travel dates, the other major factor that affects your ticket price is how far ahead of time you purchase your ticket. You almost always want to avoid booking at the last minute, but booking as early as possible doesn't always get you the cheapest fare.
There is no surefire way to book at the lowest possible price. But some useful rules of thumb and price prediction services can improve your odds of getting a good ticket price. And with the major US airlines, you may be able to lock in the current fare and re-book if prices drop.
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When possible, book early (and re-book if the price drops)
Rules of thumb
Setting price alerts
Price prediction services