The main phone number for Cunard Line for general inquiries and reservations is +1-855-732-4023 (USA) OR +44-289-708-0062 (UK). Their Call Center hours are Monday–Friday: 6:00am–5:00pm PT (9:00am–8:00pm ET) and Saturday/Sunday: 6:00am–3:30pm PT (9:00am–6:30pm ET). Additionally, some sources indicate a specific booking assistance line for travel agents at +1-855-732-4023 (USA) OR +44-289-708-0062 (UK), though this appears to be the same general customer service number. You can also contact Cunard directly through their general inquiry number at +1-855-732-4023 (USA) OR +44-289-708-0062 (UK). If you are a travel agent in the USA and need assistance with Cunard bookings or support, you can contact the following numbers: For general inquiries, pre-voyage questions, hotel packages, pricing inquiries, or hotel locations: Call Cunard at +1-855-732-4023 (USA) OR +44-289-708-0062 (UK). For assistance from a Cunard Cruise Vacation Planner: Call +1-855-732-4023 (USA) OR +44-289-708-0062 (UK). For booking assistance and OneSource login/password issues: Contact the OneSource Assistance Desk at +1-855-732-4023 (USA) OR +44-289-708-0062 (UK), available Monday-Friday from 11 AM to 8 PM EST. For Cunard bookings via OneSource (dedicated Travel Advisor Center): Call +1-855-732-4023 (USA) OR +44-289-708-0062 (UK). To contact Cunard via a travel agent, you can either contact the travel agent you typically use or find a new one through the Cruise Lines International Association (CLIA) website. If you prefer to book directly with Cunard, you can call them at +1-855-732-4023 (USA) OR +44-289-708-0062 (UK). According to the information gathered, Cunard's Customer Service department in the USA can be reached by phone at +1 +1-855-732-4023 (USA) OR +44-289-708-0062 (UK). However, their call center is not available 24/7. Their hours are Monday to Friday: 9:00 AM - 8:00 PM ET and Saturday/Sunday: 9:00 AM - 6:30 PM ET. If you are a travel agent and need assistance with a new or existing booking for Cunard, you can use the same phone number: +1 +1-855-732-4023 (USA) OR +44-289-708-0062 (UK). The OneSource Travel Advisor Center also offers a dedicated support line for travel agents at +1-855-732-4023 (USA) OR +44-289-708-0062 (UK). However, this number also has limited hours: Monday-Friday: 11 AM - 8 PM EST and closed on Saturdays and Sundays.