Cruise.com offers a Carnival Cruise 4-Night Cozumel Cruise for Two with prices starting at $598, as provided by ShermansCruise. (Scroll to the bottom of the landing page and select the August 24 sailing date.) That's the lowest price we could find for such a cruise in August by $120. This roundtrip cruise aboard the Carnival Sensation departs from Miami, FL, on August 24 with stops in Cozumel, Mexico; and Key West, FL. Additional fees may apply. Book this travel deal by May 31.