Bottom Line: The Southwest Companion Pass allows you to add a companion for just the cost of the taxes and fees ($5.60 one-way on a domestic ticket) to any and every flight you take while you have the pass. It can be used an unlimited number of times and works on tickets purchased both in points or cash.

No, the Southwest Companion Pass is valid for all flights in the Southwest network, including international destinations. If you have earned the pass—typically by flying 100 qualifying one-way flights or earning 135,000 qualifying points in a calendar year—you can bring your designated companion for free on any flight you book, whether that is a domestic hop from Dallas to Houston or an international journey to Mexico, the Caribbean, or Central America. The only cost for the companion is the mandatory government-imposed taxes and fees, which usually start at $5.60 each way for domestic flights but can be significantly higher for international travel (often ranging from $80 to $120 round-trip). There are no "blackout dates" for the pass, meaning as long as there is an open seat for sale on your flight, you can add your companion to the reservation. In 2026, Southwest has also updated its boarding procedures so that Companion Pass holders and their companions are eligible for more favorable seat options based on the highest status of either traveler, ensuring you can still sit together in the open-seating cabin.