Cruise ships in St. Kitts

It's summertime and the cruising's easy. Lines are offering incentives to get families onboard for break, or couples booking that vacation for next year. We'll be rounding up all of the offers and promotions right here all summer long. Check back for the latest cruise deals.

Norwegian's Free at Sea Offer Continues

What it is: Norwegian's Free at Sea perks include up to all five offers. Offers include a drinks package, specialty dining package, $50 per port to spend on shore excursions, 250 minutes of free internet, and free third and fourth passengers to a cabin. Studios and inside cabins qualify for one offer; passengers staying in an ocean-view, balcony and mini-suite cabins receive two perks; select Haven and suites receive up to all five offers. For a limited time, passengers can also receive up to $500 in onboard credit.

Eligible voyages include: More than 200 applicable sailings of three nights or more; exclusions apply. Seperate offers for Norwegian Sky and Pride of America.

Valid: Extended through August 31, 2018

Hurtigruten Offers Free Flights to Antarctica

What it is: Now's your chance to book that bucket-list cruise to Antarctica. A selection of 13- to 18-day sailings qualify for free roundtrip flights.

Eligible voyages include: Select cruises to Antarctica in winter 2019/2020

Valid: Extended through August 31, 2018

Free Flights to Europe With Spring 2019 Scenic River Cruises

What it is: Plan a 2019 river cruise with Scenic and enjoy perks like free flights to Europe, waived single supplements and other discounts.

Eligible voyages include: A variety of 2019 Europe river cruises on the Danube, Seine, Rhine and more.

Valid: Through August 31, 2018

Celebrity's Seven Seas Sale

What it is: Save up to $300 per booking plus one perk, which can include either a classic beverage package, unlimited Wi-Fi, $150 in additional onboard credit or prepaid gratuities. Additional passengers to a cabin (beyond the first and second) receive 50 percent off their cruise fare. Passengers booked in suites save up to $400 plus receive all four perks, including a premium beverage package upgrade.

Eligible voyages include: Select sailings four nights or longer to Alaska, Bermuda, the Caribbean and more destinations, departing September 1, 2018 through April 30, 2020 (exclusions, like the Galapagos and repositioning cruises, apply).

Valid: Through September 5, 2018

Princess Cruises' Sip+Sail Means Free Drink Packages When You Book a Balcony

What it is:Princess is doling out premium beverage packages when you book a balcony stateroom or higher category room on your next cruise. In addition, passengers will receive a free unlimited soda packages for third and fourth guests in the stateroom.

Eligible voyages include: A variety of cruises and cruisetours sailing summer 2019 to spring 2020 to Alaska, the Caribbean, British Isles, Scandinavia and more.

Valid: Through September 5, 2018

Variety Voyages Offers Up To 10% Off Select Voyages

What it is: Variety Cruises is offering reduced rates of 10 percent off on select itineraries and departure dates. Savings depend on itinerary.

Eligible voyages include: New bookings to Seychelles, Costa Rica, Cape Verde, Bali, the Red Sea and more.

Valid: Through September 15, 2018

Up to 40% Off Select Princess Cruises Itineraries

What it is: Receive up to 40 percent off your next cruise, when you book with Princess Cruises' "Sun-Drenched Deals" promotion. Cruises start from $539 for a weeklong Caribbean cruise out of Fort Lauderdale.

Eligible voyages include: Select fall 2018 to summer 2019 itineraries, to destinations including the Caribbean, Asia, South America, Australia and Hawaii

Valid: Through September 24, 2018

Save Up to $1,000/Person with Crystal Cruises' Early Booking Offer

What it is: Book now for an upcoming year of delightful river cruises through Europe, and save anywhere from $250 to $1,000 per person on a Crystal river itinerary like Vienna to Basel or Amsterdam to Frankfurt.

Eligible voyages include: Select 2018 and 2019 European river cruises

Valid:Through September 30, 2018

Free Air on Silversea Sailings to the Med

What it is: Book ahead for next summer and receive free Business Class airfare on your luxury Silversea cruise to the Mediterranean, plus transfers.

Eligible voyages include: Voyages on various Mediterranean itineraries throughout 2019

Valid: Extended through September 30, 2018

Cunard's Summer Savings Event

What it is: Book a Cunard cruise to a wide variety of destinations in a balcony cabin and save up to 30 percent off, as well as prepaid gratuities. Plus, anyone staying in a Grills Suite gets free drinks and gratuities.

Eligible voyages include: A variety of sailings from transatlantics to the Caribbean, Asia, Africa, Northern Europe or a cruise that goes to Japan and Alaska.

Valid: Through October 1, 2018

Free Perks with Holland America's Explore4 Promotion

What it is: Holland America is offering four free perks when you book any cabin on select itineraries. Offers include a drinks package, a Pinnacle Grill dinner, free or reduced fares for third and fourth passengers, and reduced deposits. Additionally, suite passengers will receive an extra $100 in onboard credit per person.

Eligible voyages include: More than 600 sailings -- plus select Alaska Land+Sea Journeys -- from winter 2018 to spring 2020.

Valid: Through November 19, 2018

The Drinks Are On MSC

What it is: MSC's "Drinks on Us" promotion adds inclusive alcoholic and nonalcoholic beverages packages to Caribbean sailings from Miami aboard MSC Divina, MSC Seaside or MSC Meraviglia -- a value of more than $250 per person.

Eligible voyages include: Select Caribbean itineraries aboard Divina, Seaside or Meraviglia departing now through winter.

Valid: Extended through November 30, 2018

Star Clippers Homeports in St. Maarten, Offers 2-Night Caribbean Hotel Stay

What it is: Celebrate Star Clippers' Star Flyer homeporting from St. Maarten, or take the Royal Clipper from Barbados, and enjoy a complimentary two-night hotel stay before or after your sailing plus breakfast and transfers, valued around $600.

Eligible voyages include: A selection of seven- to 14-night sailings departing this December through winter 2019, beginning or ending in Barbados or St. Maarten.

Valid: Depending on availability

Save Up to $1,000 on Winter Cruises on Pearl Seas

What it is: Pearl Seas Cruises is offering up to $1,000 on their cultural voyages to Cuba.

Eligible voyages include: Select winter 2018 and spring 2019 sailings

Valid: Depending on availability

Up to $2,000 Off Holiday Cruises on American Cruise Lines

What it is: Save on seven-night sailings of the all-new paddlewheeler, America, when you book a holiday cruise along the Mississippi River to New Orleans, Memphis and more, including one special sailing of a 10-night Colonial Holiday cruise on the new-for-2018 American Constitution sailing Chesapeake Bay, departing December 23, 2018.

Eligible voyages include: Select 2018 and 2019 holiday sailings

Valid: Depending on availability

Ponant Offers 25% Savings on Small-Ship Cruises for Winter

What it is: Save up to 25 percent on Ponant Cruises' far-flung sailings to Antarctica, Patagonia, Oceania or South Africa.

Eligible voyages include: Cruises departing January through March 2019

Valid: For a limited time only

Save Hundreds on AmaWaterways' Newest River Ship

What it is: AmaWaterways is offering up to $800 to sail its newest vessel AmaMagna on its inaugural season in 2019. With this offer, passengers can upgrade from a base-category stateroom to a 355-square-foot suite with a supplement of $2,999 per person.

Eligible voyages include: AmaMagna sailings throughout 2019

Valid: For a limited time only

--By Brittany Chrusciel, Associate Editor