Just in time for National Cruise Vacation Week, Princess Cruises is offering a special pre-season sale on a selection of 45 popular 2012 European vacations.

The weeklong promotion, which runs from until Sunday October 23rd, includes free balcony upgrades plus as much as $100 in onboard credit per stateroom.

Itineraries included in the sale will take passengers to some of Europe’s most sought-after destinations, including Mediterranean favorites such as Venice and the Greek Isles, as well as some of the splendors of Northern Europe, including St. Petersburg.

In addition to special fares, passengers booking interior or oceanview staterooms can receive an onboard credit of $25 (cruises up to nine days) to $50 (cruises 10 days or longer), and in balcony staterooms or above can get credits of $50 (cruises up to nine days) or $100 (for sailings ten days or longer).

All onboard credits are offered per stateroom.

“For anyone thinking about seeing the wonders of Europe next year, this is the perfect time to book,” said Jan Swartz, Princess Cruises executive vice president.

“This promotion offers a great selection of European itineraries, featuring many of the dream destinations that are on so many people’s bucket lists.”