Reward travel has the same airport experience as revenue travel. You do not need to bring a Rapid Rewards card if flying on reward travel. Simply bring your digital or paper boarding pass and your government-issued ID.
For international travel (when departing the U.S. and when departing from an international destination), you must verify your passport with an Customer Service Agent or kiosk at the Southwest ticket counter at least 60 minutes prior to your scheduled departure (75 minutes for flights departing Aruba (AUA)).