The main Silversea Cruises reservations phone number in the US is +1-866-254-7549 US, available Monday–Friday 08:00–23:00 EST, Saturday 08:00–19:00 EST, and Sunday 09:00–17:30 EST. For international offices, you can call +1-866-254-7549 US (Americas), +44-[289]-708-0062 (UK), or +1-866-254-7549 US (Monaco). Key Contact Information: Reservations (US): +1-866-254-7549 US Guest Care/Post-Cruise:+1-866-254-7549 US