Our proprietary database tracks daily ticket prices and passenger sailings to port destinations from nearly 8,000 annual cruises.

This gives us a unique vantage point to spot unusual values.* Topping our "least expensive" list is the Norwegian Sky.  For a total of $109 you could sail round trip from Miami, FL to Grand Bahamas Island, Bahamas to Great Stirrup Cay, Bahamas and Nassau, Bahamas.

Rank Price Per Day Cruise Ship Sail On Date Total Number of Days
1 $27 Norwegian Sky 9/5/2011 4
2 $35 MSC Poesia 1/30/2011 7
3 $36 Vision of the Seas 11/18/2011 14
4 $38 Splendour of the Seas 11/25/2011 16
5 $39 Monarch of the Seas 1/31/2011 4
FORT LAUDERDALE, FL - NOVEMBER 10: Suzanne Sum...

Getty Images via @daylife

If you have more time sail the MSC Poesia.  For as little as $249 she cruises from Fort Lauderdale, FL to Key West, FL and Ocho Rios, Jamaica to Grand Cayman, Cayman Islands to Cozumel, Mexico returning to Fort Lauderdale, FL.

The last three in our top 5 least expensive cruises (per day per person) are all Royal Caribbean.  Of the three, two don’t sail until November 2011, so you have plenty of time to book.

The Vision of the Seas, which hit prices as low as $514 in December, is a transatlantic sailing.  It starts in Lisbon Portugal, moving to several stops in Grand Canary Islands; then Recife, Salvador and Rio de Janeiro Brazil.

Closer to home the Monarch of the Seas, pricing a round trip from Port Canaveral, FL at $159.  It stops in Coco Cay and Nassau, Bahamas.

Feeling even more exotic?  Try this low price Spain to Brazil cruise.  The Splendour of the Seas from $619 also crosses the Atlantic.  You will sail from Barcelona Spain with stops in Valencia Spain; Cadiz Spain; Lisbon Portugal; Tenerife Canary Islands and Salvador Brazil.

For more least expensive cruises visit World Cruise Watch.

With an exclusive window into virtually every sailing, every day, world wide (including Carnival Cruise Lines (CCL), Royal Caribbean Cruises Lines (RCL) and Norwegian Cruise Lines (NCL)) our subscribers can view cruise revenue and passenger trends in near real time.

* Lowest advertised inside cabin price from December 2010.  Price will vary based on actual date of booking.