The Southwest Companion Pass is the highest award in the Rapid Rewards program.
Once you’ve reached 100 one-way flights or earned 135,000 qualifying points in a calendar year, you can take a companion on any flight with you for just the cost of the taxes and fees, which in the U.S. are $5.60 each way.
This status is good immediately once you meet the requirements through the remainder of the following calendar year. For example, a Companion Pass earned in October 2023 will be valid through December 2024.