Here's how much each airline charges for checked bags and carry-ons

AP Photo/Patrick Semansky

Don't get caught paying luggage fees you weren't expecting.

• Every airline has a different policy for luggage fees.
• Some airlines, such as Southwest, allow passengers two free checked bags, while budget airlines such as Frontier and Spirit charge for checked bags and even carry-ons.
• We compared the luggage-fee policies of eight US airlines.

Every airline has a different policy when it comes to charging fees for your luggage.

On one end of the spectrum, Southwest Airlines permits customers to check up to two bags for free, with a third checked bag costing $75.

On the other end, budget airlines such as Frontier and Spirit won't let you take any bags on the plane for free - even a carry-on - meaning they might not be the smartest options for travelers with lots of baggage.

We compared the baggage fees for eight different US-based airlines to see how they stack up. Take a look at the graphic below to help you decide which airline you should take for your next trip.

Shayanne Gal/Business Insider