Most major airlines offer frequent flyer programs — a benefits program for avid travelers. By remaining loyal to one airline, you can earn back "miles" to spend on future flights while racking up other benefits. So, which US airline's frequent flyer program offers the most affordable miles? We're evaluating the programs of major commercial airlines nationwide to determine which has the most advantages.

The Winner: Southwest Airlines' RapidRewards We selected Southwest Airlines Rapid Rewards as the winning rewards program for a number of reasons. You can access major discounts for already discounted flights on the widely acclaimed budget airline. "Wanna Get Away" fare (which is equal to basic economy) will earn you 6 points per dollar, and the amount earned goes up even more based on fare class.

You can also earn points by purchasing hotel stays and rental cars through the airlines' many partners. Chase Visa cardholders can earn even more points through everyday purchases. These points can be used for free flights, rental cars, hotel stays, and more.

Because the flights are already cheap, and the number of points per dollar is so high, this is by far the winning frequent flyer program in the affordability department. The Runner Up: Alaska Airlines' Mileage Plan Launched in 1983 as the Gold Coast Travel program, Alaska Airlines' frequent flyer program is now known as Mileage Plan. Members of the Alaska Airlines Mileage Plan program can earn points by flying Alaska Airlines or.