No, your wife cannot use your physical United Club card (or the digital membership card in your app) if she is traveling without you. United Club memberships are strictly non-transferable. The name on the membership must match the name on the boarding pass of the person entering the lounge. However, if you are a primary cardmember of the United Club Infinite Card, you are entitled to bring "one adult and dependent children under 21" or "up to two guests" with you when you visit the lounge. If your wife wants to access the club while traveling alone, she would need to be added as an Authorized User on your credit card account, though it is important to check the current 2026 terms as United recently updated policies regarding lounge access for authorized users. In most cases, authorized users on the Infinite card do not get their own full membership. Alternatively, she could use one of the two one-time passes typically provided annually to Sapphire/Quest cardholders, provided the name on the pass matches her boarding pass at the time of entry.