Not all Capital One cardholders can free access to Capital One Lounges. Here's how Capital One Lounge access breaks down by card:
Capital One Venture X: Unlimited access for cardholders (including authorized users) and up to two guests. Additional guests cost $45 each.
Capital One Venture Card: 2 complimentary visits per calendar year. Guests and additional visits cost $45 each.
Capital One Spark Miles for Business: 2 complimentary visits per calendar year. Guests and additional visits cost $45 each.
All other Capital One cardholders and general public: $65 per person per visit.
The Venture X card also comes with Priority Pass airport lounge access, separate from the Capital One lounges.