The next time you redeem your frequent flyer miles, check to see if your airline mileage program allows you to add a free one-way ticket to your itinerary with no additional miles to redeem.

For example, redeeming miles for a round-trip flight from the U.S. to Europe, pick a different return city.

So instead of a Chicago to London round-trip ticket, go Chicago to London, then London to Munich and finally Munich back to Chicago for the same amount of miles.

The London to Munich flight is the bonus.

There are dozens of flight itineraries that qualify.

When researching online, just go to your airline’s website, hit “redeem miles” and then choose a multi-city trip, and check which flight combinations work.