Travel rewards can be great.

You fly frequently or use your credit card to earn points, and you get a free flight.

But those flights are rarely 100% free.

Usually, they still include many airport fees.

This chart compares the fees of five popular airlines reward programs so you know what youre getting into.

Check out the analysis for United, below, then head over to the site to compare the others.

What that free airline award ticket will cost you| CreditCards.com