The Southwest Companion Pass is one of the most valuable travel perks out there. It lets you bring a companion with you on every Southwest flight, even if you book it with points. You only have to pay the taxes and fees associated with your companion’s ticket, which can be as low as $5.60 on domestic flights.

There’s no limit to the number of times you can use this perk, and you can even change your designated companion up to three times per calendar year. Depending on how often you travel and where you fly, Southwest’s Companion Pass could save you thousands of dollars a year on airfare.

Earning a Southwest Companion Pass is easier than you might think. You can make progress towards the pass by using Southwest credit or debit cards, flying the airline and leveraging other Southwest partnerships.

The Southwest Companion Pass is a perk offered to Southwest Rapid Rewards members that lets you bring a designated companion on every Southwest flight you take, for just the cost of taxes and fees. Flights can be booked with cash or points, you can use the pass as much as you’d like and it works on any Southwest-operated flight, including international routes and flights to Hawaii.

You’ll earn the pass when you earn 135,000 Companion Pass points or fly 100 Southwest flights in a calendar year. The pass is valid for the remainder of the year in which you earn it and the entirety of the following year, so you can maximize time with the pass by earning it as close as possible to the beginning of the year.