Q. For a couple of weeks we've been eyeing a one-way fare from Miami to Paris. We were in the middle of finally booking this fare but there was a delay having to do with our credit card, then access to the airline site expired. When I started all over again and the fare had changed jumped by several hundred dollars. We then tried again, erasing all our cookies, but this didn't work. What's going on?

A. This could simply be because the airline changed the airfare, or the number of seats at the lowest fare has changed. Airfares change all the time on any given route, and there’s no magic to finding the cheapest seats other than searching constantly and signing up for airfare alerts and pouncing immediately when a fare looks cheap. And while there’s no solid evidence that clearing cookies changes the game, it never hurts to try.

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