Generally, no—a Southwest Companion does not fly standby; they fly on a confirmed reservation. When a Rapid Rewards member earns a Companion Pass, they can book a seat for their designated companion on any flight that has at least one seat available for sale. This is a confirmed ticket, not a "space available" standby ticket. However, if the primary traveler wants to switch to a different flight on the same day using Southwest's "Same-Day Standby" benefit, the companion can also be added to that standby list for free. In this specific scenario, the companion is flying standby, but their original booking was a confirmed seat. It is important to remember that the companion's flight must always be booked after the primary traveler has secured their own ticket, even if that ticket was purchased with points.