If you have to be at your destination by a particular time, be careful about waiting too close to your departure time before purchasing your ticket. If you do not have your seat reserved a week before you need to be there you run the risk of not being able to get a flight. This is especially true of flights to popular destinations and during peak travel season.
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Rarely ever do airline tickets get cheaper as your departure date approaches, especially if you need to fly on a certain date. Budget airlines typically offer low rates as a baseline price, and as these tickets sell, the remaining ones increase in cost. This is very typical in Europe and Australia. If you know when and where you're going, don't wait on an unknown sale. More often than not, your biggest savings come from booking far ahead when you can.
In Google Chrome or Safari, incognito is enabled by hitting Command (or “Control” if using PC), Shift, “N”. For Mozilla Firefox or Internet Explorer, hit Command (or “Control” if using a PC), Shift, “P”. This will open a new browser window where your information is not tracked, thus not inflating prices as you search. Note: if you're using an older version of OS X, open Safari then click “Safari” in the menu bar, and select “Private Browsing”.