Cruise ships in St. Kitts

Spring is here and the cruise deals are out in force, with perks, discounts and savings on voyages for 2018 and into 2019. Most of these savings reward those who book early and plan ahead, and in many cases, the savings from these perks and bundles can be substantial.

Check the latest offerings below from your favorite cruise lines to see what perks might be in store for you this spring.

Kids + Grads Sail Free on Bahamas Paradise Cruise Line

What it is:Bahamas Paradise runs short cruises from West Palm Beach to Freeport, and return. The line is offering either $50 in onboard credit of the chance for your kids -- age 16 and under -- to cruise for free. Plus, for the months of May and June 2018, grads sail free (minus taxes and gratuities) in any cabin with two paying passengers.

Eligible voyages include: Select sailings

Valid:This is an ongoing offer, subject to availability

Celebrity Summer & Beyond Sale Offers Savings For You & Your Friends

What it is: Celebrity is offering perks for the first and second guests in a stateroom, and 50% off fares for third and fourth guests sharing the same stateroom or suite. The first and second guests sharing Suite Class accommodations receive premium beverage packages; unlimited Wi-Fi; prepaid gratuities; and $150 onboard credit. First and second guests booking other stateroom categories receive two perks from the above list.

Eligible voyages include: All cruises four nights or longer departing by August 31, 2018. Offer excludes Galapagos, repositioning, transatlantic, transpacific, and Alaska cruisetours.

Valid: Extended through May 30, 2018

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.

Eligible voyages include: More than 200 applicable sailings of three nights or more.

Valid: Extended through May 31, 2018

Royal's Wow Sale Saves Half on Second Guest

What it is: Book a Royal Caribbean cruise this week and save half on the second passenger's cruise far, plus earn up to $100 in onboard credit per cabin, depending on room category.

Eligible voyages include: An array of more than 300 sailings departing on or after June 1, 2018

Valid: Extended through May 31, 2018

Hurtigruten Offers Anniversary Savings

What it is: Norwegian cruise and expedition company Hurtigruten is redicong fares on select expedition cruises and Norwegian Coastal cruises.

Eligible voyages include: Select Norwegian Coastal cruises

Valid: Through May 31, 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 or MSC Seaside -- a value of more than $250 per person.

Eligible voyages include: Caribbean itineraries aboard MSC Divina and MSC Seaside, departing from April 14, 2018 forward.

Valid: New bookings made by May 31, 2018

Free Air & Family Savings on Silversea Galapagos Sailings

What it is: Sail with Silversea to the Galapagos this year and receive free roundtrip airfare from select U.S. and Canadian gates (or $299 per person) along with $500 in savings for passengers under the age of 18.

Eligible voyages include: Voyages departing between July 7 and December 15, 2018

Valid:Through May 31, 2018

Save $1,000 Per Person on a Uniworld River Cruise

What it is: Book a river cruise with Uniworld by the end of May and save up to $1,000 per person.

Eligible voyages include: Select 2018 sailings to France, Northern Italy and other parts of Europe.

Valid:Through May 31, 2018

Upgrades, Onboard Credit, Air Credits with Seabourn's Extraordinary Opportunity Event

What it is: Seabourn is rolling out the perks on select 2018 and 2019 cruises across its fleet. Benefits available on select cruises, which vary by voyage, can include a complimentary two Veranda Suite category upgrade; complimentary Verandah for Oceanview suite upgrade; shipboard credit of up to $500 per suite; $500 air credit offer per person for roundtrip flights booked through Seabourn; up to 15 percent savings on combination cruises and half off deposits. Penthouse and Premium Suites on select voyages offer $1,000 credit per suite.

Eligible voyages include: Select voyages departing in 2018 and 2019.  

Valid: Through June 12, 2018.

Holland America Offers Prepaid Gratuities, Reduced Deposits & Fares

What it is: Holland America's Ready Set Sail promotion offers prepaid gratuities and attractive fares on voyages departing between September 1, 2018 and August 1, 2019, plus half off deposits. Passengers booking suites can receive up to $300 onboard credit.

Eligible voyages include: All Holland America cruises departing between September 1, 2018 and August 1, 2019, excluding Grand Voyages and Grand Voyage segments.

Valid: Through June 14, 2018

Princess Cruises Offers Up to $1,000 in OBC Per Cabin

What it is: Princess is offering free up to $500 in onboard credit per person, depending on room category, for a variety of their most popular sailings next summer.

Eligible voyages include: A wide variety of destinations including Alaska, the Caribbean, Japan and Europe, on 2019 summer sailings that are at least seven days long.

Valid: Through June 19, 2018

Cunard's Balcony Event

What it is: Book a Cunard cruise to a wide variety of destinations in a balcony cabin and earn up to $1,400 in onboard credit per cabin. 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:Extended through July 31, 2018 Celebrates 30th Anniversary With Free Amazon Echo Dots

What it is: Cruisers booking any seven-night cruise or longer in a balcony stateroom receive a free Amazon Echo Dot as part of's 30th Anniversary. Amazon Echo Dot is mailed out 30 days after completion of sailing.

Eligible voyages include: New seven-night or longer bookings in a balcony stateroom or above.

Valid: Through July 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

Variety Voyages Offers Up To 40% Off Select Voyages

What it is: Variety Cruises is offering reduced rates of up to 40 percent off and waived single supplements on select itineraries and departure dates. Savings depend on itinerary. Free upgrades are offered itineraries in the Dalmatian Coast, the Adriatic, and Spain and Portugal. Free shore excursions offered on itineraries in the Seychelles. 

Eligible voyages include: Select voyages, departing prior to August 20, 2018, to the Dalmatian Coast; Greece; Spain and Portugal; and the Seychelles. Must mention "Flash Offer" at booking or standard pricing applies.

Valid: Depending on availability

65% Off Star Clippers Grand Voyages + Reduced Air to Europe

What it is: Book Star Clippers' 12-night Grand Voyage to Europe in October and save 65 percent on cruise fares plus roundtrip airfare from select departure cities to Cannes for $499 per person.

Eligible voyages include: October 13, 2018 sailing of Royal Clipper to Lisbon. Double occupancy prices start from $3,150 per person.

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

--By Aaron Saunders, Cruise Critic contributor; updated by Brittany Chrusciel, Associate Editor