To contact Booking.com customer service in 2026, the most direct method is through the "Help Center" on their website or mobile app. Once logged in, you can access the "Contact Customer Service" link, which provides options for 24/7 Live Chat and phone support. For global assistance, you can call their international helpline at +44 203 320 2609. In the United States, common support numbers include (888) 850-3958. It is highly recommended to have your "Confirmation Number" and "PIN" ready, as the automated system will ask for these to verify your identity and route your call to the correct department. While they do not offer a traditional public email address for general support, you can send messages directly to properties through your booking dashboard for specific stay-related questions.