Most credit cards that offer the Priority Pass Select membership allow 2 additional guests at no cost.
Some cards have written in their terms and conditions that starting with the third guest, the charge is based on the Standard Priority Plan rate, which is currently $32 per person, per visit.
Other cards have a discounted rate of $27 per person, per visit for the third guest and beyond.
A few cards offer unlimited guests at no additional charge.
When you register for Priority Pass membership with your card, the number of guests you can bring and the amount you will be charged for guests will be fully disclosed.
You can also review the Priority Pass membership details in the information displayed before you select a card or check the terms and conditions in your card benefits guide when you receive your card.