United Airlines DEN Terminal also features multiple United Club lounges for those seeking a more comfortable and relaxing pre-flight experience, offering amenities like complimentary beverages, Wi-Fi, and seating areas. For international business travelers, the United Polaris Lounge provides a luxury travel experience with premium services. Concourse B is well-connected to the rest of the airport via the underground train, making it easy for passengers to navigate between terminals and catch connecting flights efficiently.