The cruise provider will set sail out of Baltimore beginning in June 2010 and service will end in April 2011. Trips include nine-night cruises to Florida and the Bahamas, and 12-night cruises to the Caribbean.

The Miami-based company had recently planned to end its 2010 Baltimore schedule in November.

“Royal Caribbean’s decisions today further reflect how the international cruise industry feels about Maryland as a growing cruise market with lots of potential,” Gov. Martin O’Malley said in a statement. “Maryland’s Port of Baltimore is within a six-hour drive for 40 million people. Our easily accessible cruise terminal has become a well-known commodity among cruise lines.”

Royal Caribbean will join Carnival Cruise Lines (NYSE: CCL) in offering a year-round cruise out of Baltimore. Carnival’s 2009 Baltimore cruise season begins April 27.

Also on Wednesday, Royal Caribbean unveiled plans to sail a larger ship, the 2,252-person “Enchantment of the Seas” vessel, out of Baltimore during the 2010 season. By comparison, the company’s “Grandeur of the Seas” that ships out of Baltimore carried 1,950 guests.

In 2009, the Port of Baltimore will offer 79 cruises, up from 52 last year. The economic impact of cruising out of Maryland is expected to reach $152 million this year.