If you're planning on flying overseas, you're probably congratulating yourself on snagging a cheap fare from the U.S. to that foreign destination. But if you've also booked flights from one foreign city to another on that same website, I'll bet you overpaid.

You can save hundred flying intra-continentally by booking those flights from foreign websites.

First go to www.azworldairports.com to learn which airlines service those cities. Then check fares on those carriers' websites as well as www.opodo.com.

There are many foreign discount airlines you should know about too. In Europe, beside Ryanair, there's Easyjet, Air Berlin and Virgin Express.

In Asia check out AirAsia Jetstar and Tiger Airways.

India too has many discounters, including SpiceJet where one way fares can start as low as 99 rupees, roughly $2 one way.

As in American, don't dawdle. The great low fares sell out quickly.