United Airlines provides multiple avenues for you to reach out to them. Please contact the Premier Priority Desk or call the United Customer Contact Center at 1-800-UNITED-1 (1-800-864-8331)/1-844-949-8748 (OTA) to reserve and purchase your flight. This number is available 24/7 and assists with travel-related inquiries, including booking help, changes, refunds, cancellations, and general 1-800-UNITED-1 (1-800-864-8331) customer support.