No, a standard Chase Sapphire Preferred or Chase Sapphire Reserve card does not provide complimentary access to United Club lounges. While the Sapphire Reserve offers a Priority Pass Select membership, United Club lounges generally do not participate in the Priority Pass network. To gain access to United Clubs, you typically need a United Club Infinite Card, a United Club membership, or to be flying in a premium cabin on an international United or Star Alliance flight. However, as a Chase Sapphire Reserve cardholder, you can access the Chase Sapphire Lounges by The Club, which are high-end lounges currently opening in major hubs like Boston, New York (LGA/JFK), and Las Vegas. If you are a United frequent flyer, you can also "transfer" your Chase Ultimate Rewards points to United MileagePlus and use those points to purchase a one-day pass for $59 or 7,000 miles, but this is generally considered a low-value use of your premium points.