Need to change or cancel a reservation booked through The Cosmopolitan website? Here's how.
Please call 877.551.7778.
Locate the Web Reservation Number listed in your confirmation email
Visit our Online Room Reservations Site (from a desktop computer or mobile device)
Click on the Modify/Cancel link at the bottom of the page:
If your reservation was booked on a third-party website or by a travel agent, please contact them directly regarding changes to your reservation.