It's no joke -- April is here, and with it are a new crop of spring cruise deals. Look out for free flights, savings on fares and those ever-present perks (meaning spending money, free booze and other bonus amenities that make your sailing shine).

Check out the latest deals from your favorite cruise lines so you can plan your last-minute summer getaway or upcoming family vacation with confidence.

Norwegian's Free at Sea Deal

What it is: Norwegian's Free at Sea promotion includes your choice of an Ultimate Beverage Package, specialty dining package, 250 minutes of free internet, $50 in shore excursion credit per port or the third and fourth guests to a cabin sail free. Passengers booked in studio and inside cabins have their choice of one perk; two perks for those booked in oceanview balcony and mini-suite rooms; Concierge, Haven and suite guests receive up to all five offers.

Eligible voyages include: Sailings more than three nights fleetwide

Valid: Ongoing

Regent's Elevate & Explore Sale Offers Suite Upgrades + OBC

What it is: Regent Seven Seas is inviting you to book your next sailing on a variety of exotic itineraries with a two- or three-category suite upgrade plus up to $250 in onboard credit per suite.

Eligible voyages include: A selection of sailings to Asia, Australia/New Zealand and the South Pacific.

Valid: Ongoing, while availability lasts

BOGO to Asia This Spring on Star Clippers

What it is: Sail a small-ship cruise to Thailand with a friend this spring; Star Clippers is offering buy-one-get-one-free fares on exotic sailings through Thailand and Malaysia. Fares start at just $1,400 per person.

Eligible voyages include: April departure dates of the seven-night Southern or Northern Phuket Island sailings

Valid: While availability lasts

Save Up to 30% on 2020/2021 Hurtigruten Voyages

What it is: Book an adventure early aboard Hurtigruten and save up to 30 percent on sailings in 2020 and 2021.

Eligible voyages include: North America, Mexico & Central America and South America; and up to 25 percent in Svalbard, Alaska, Antarctica, Greenland, Iceland, the Northwest Passage and more.

Valid: Through April 30, 2019

Free Airfare on Select 2019 Uniworld River Cruises

What it is: Book a 2019 river cruise with Uniworld, and opt for free economy airfare, or upgrade to business class air for $1,999 per person.

Eligible voyages include: Select 2019 departures including Europe, Egypt, Russia, India and other parts of Asia.

Valid: Through April 30, 2019

Discounts on Viking River Cruises + Reduced or Free Air

What it is: Cruise at a reduced rate on Europe's most famous rivers. Plus, fly from $499 per person

Eligible voyages include: Basel to Amsterdam; Paris to Prague; and Budapest to Amsterdam

Valid: Through April 30, 2019

Princess Cruises' Come Back New Sale Offers Upgrades + Hundreds in OBC

What it is: Book a cruise sailing this fall through next spring and you might earn rewards like a free room upgrade, up to $600 in onboard credit per cabin (based on category and sailing length), and third and fourth passengers to a cabin sail from just $99 each.

Eligible voyages include: A selection of sailings worldwide from fall 2019 through spring 2020 to the Caribbean and Mexico, Canada/New England, Southeast Asia, Hawaii, the Panama Canal and more.

Valid: Through April 30, 2019

Princess Cruises' Sail Into Savings Promo Offers 40% Off Cruisetours

What it is: Save up to 40 percent off select cruises and cruisetours departing this spring and summer.

Eligible voyages include: Select cruises and cruisetours sailing spring through summer 2019 including Alaska, Baltic and British Isles.

Valid: Through April 30, 2019

Avalon Waterways' Suite Life Sales Event

What it is: Save thousands on select 2020 Europe river cruises with Avalon when you book by April 30. Book a Europe cruise in advance of next year and receive discounted airfare from $299 per person along with $1,000 in savings per couple on select sailings.

Eligible voyages include: Europe river cruises departing January 1 through December 31, 2020

Valid: Through April 30, 2019

Emerald Waterways Offers Up to $1,000 in Savings/Cabin on 2020 River Itineraries

What it is: Guests booking any 2020 European sailing with Emerald, will receive a discount of $1,000 per couple on sailings of 15 days or longer and $500 per couple on sailings of eight to 14 days.

Eligible voyages include: Any 2020 river cruise in Europe -- new for the 2020 season, Emerald Waterways is offering a twist on their popular "Jewels of the Rhine" cruise with a "Tulips & The Rhine" itinerary.

Valid: Through April 30, 2019

Save on Quark Expeditions' Voyages to the North Pole

What it is: Earn a free transfer package valued at $1,995 plus 10 percent savings on early bookings to the North Pole with Quark if you pay by June 15, 2019. Plus, save up to $2,000 on cabins plus complimentary air on select departures of Quark Expeditions' Arctic cruises in 2019.

Eligible voyages include: The 14-day Ultimate Arctic Adventure expedition in June/July 2020. Other promotion applies to various Arctic (Spitsbergen) departures June through September 2019

Valid: Through April 30, 2019

Special Offers for Launch of Yacht, Scenic Eclipse

What it is: Cruisers interested in Scenic's new luxury yacht can enjoy complimentary private roundtrip transfers between their home and the airport; free deposit protection coverage; and up to $500 per person in onboard credit. Passengers booking any 2019 North American voyage can also receive a free two-night hotel stay in New York City.

Eligible voyages include: Any April 2019 through Aug 2020 departure

Valid: Extended through April 30, 2019

Hurtigruten Offers Free Flights to Antarctica for New Expedition Ship

What it is: Get to the Seventh Continent to board a Hurtigruten cruise with free roundtrip air (coach class) from New York (JFK), Los Angeles, or Miami to Santiago. (Other gateways are available at an additional cost.)

Eligible voyages include: Three unique Antarctica itineraries—and five different departure dates— in 2019. All itineraries are aboard MS Roald Amundsen, a hybrid electric-powered expedition ship.

Valid: Through April 30, 2019

Celebrity's Sail Your Way Event

What it is: For a limited time, save half off third and fourth guests on a Celebrity cruise when you book a stateroom on nearly any sailing. Plus, when you book "Sail Plus" enjoy a choice of two perks, from beverage packages and prepaid tips to unlimited Wi-Fi and $150 in onboard credit. When you book "Sail All Included," enjoy all four perks.

Eligible voyages include: Select sailings four nights or longer to Alaska, Bermuda, the Caribbean and more destinations, departing from May 4, 2019 through April 30, 2021 (exclusions, like the Galapagos and repositioning cruises, apply).

Valid: Through May 1, 2019

Royal Caribbean's BOGO Half Off Sale

What it is: Book soon and save 50 percent on the second passenger in a cabin on a selection of upcoming Royal Caribbean sailings.

Eligible voyages include: Thousands of departures including short sailings that include the revamped CocoCay private island.

Valid: Through May 7, 2019

Holland America is Packing in the Value With Prepaid Gratuities, Reduced Kids' Fares

What it is: This spring, book a Holland America cruise and receive prepaid gratuities, free or reduced kids' fares and reduced deposits on your next sailing.

Eligible voyages include: Select 2019/2020 sailings worldwide from Cuba and Mexico to Panama Canal and Alaska

Valid: Through May 15, 2019

Save 20% + OBC With Cunard's Spring Savings Event

What it is: This spring, Cunard Line is offering 20 percent off fares plus up to $1,000 in onboard credit per stateroom. Plus, past guests won't pay gratuities, anad those staying in Grills Suites receive included drinks and gratuities.

Eligible voyages include: A variety of sailings from transatlantics to the Caribbean, Asia, Africa, Middle East, Canada/New England and more.

Valid: Through May 30, 2019

$500 Off U River Cruises' Theme Sailings This Summer

What it is: Save $500 on river cruise bookings including brand-new themed cruises through Germany this summer, when you book by the end of May. Cruises include "U in Drag" on July 6, featuring onboard entertainment from Rue Paul’s Drag Race, and "Tattoo on U" on August 17, offering tattoos onboard from renowned tattoo artists. Theme cruise packages include open bar throughout the cruise, three daily meals, select shore excursions, complimentary Wi-Fi, onboard local hosts and onboard programming. Prices start from $1,916 per person for a studio triple or $2,399 per person for a studio with the discount.

Eligible voyages include: Select departures of 8-day itineraries through Central Europe this summer.

Valid: Through May 31, 2019

MSC Cruises Offers Free Drinks & Wi-Fi on Ships in the Caribbean

What it is: Set sail in the he Eastern/Western Caribbean or to Canada/New England on MSC Seaside, MSC Divina, MSC Meraviglia or MSC Armonia and receive unlimited drinks for the duration of your cruise. Book any stateroom category with the Bella, Fantastica, or Wellness Experiences and receive the Drinks On Us package (valued at $250 per person). Plus, for a limited time, receive a standard internet package, as well. Sailings start from $519 per person.

Eligible voyages include: Select sailings aboard MSC Seaside, MSC Meraviglia, MSC Divina and MSC Armonia

Valid: Through May 31, 2019

Free Air on Select Silversea Sailings to the Caribbean

What it is: When booking your next Silversea cruise, expect free roundtrip air on Caribbean cruises, plus transfers.

Eligible voyages include: Voyages on various itineraries throughout 2019

Valid: Through May 31, 2019

Half Off, OBC + Free Internet on Azamara Club Cruises

What it is: This wave season Azamara is offering half off second passenger cruise fare during their "Share & Save" promo. Plus, receive up to $500 in onboard credit on select voyages and passengers booked in Club Oceanview rooms and above qualify for free Wi-Fi.

Eligible voyages include: A variety of 2019 and 2020 sailings across all ships

Valid: Through May 31, 2019

Save Hundreds With Holland America's Early Booking Bonuses

What it is: Book a Holland America cruise for spring 2020 through spring 2021 and enjoy perks totaling up to $1,200, including a signature beverage package, dinner in Pinnacle Grill, free or reduced fare for third and fourth cabin occupants and half off deposits. Suite guests will also receive up to $200 in onboard credit.

Eligible voyages include: A variety of cruises -- including Alaska Land + Sea Voyages -- from May 2020 through April 2021

Valid: Through May 31, 2019

Save on Your Next UnCruise Alaska Adventure

What it is: Save up to $1,200 per couple ($600/person) per week on select 2019 Alaska cruises.Plus, the solo supplement is waived on all Legacy Alaska departures in 2019.

Eligible voyages include: 2019 Alaska sailings aboard S.S. Legacy or Safari Endeavour, Commander cabin category only -- free single supplement applies only to Legacy sailings. Save $600 per couple ($300/person) on select 2019 Alaska cruises on UnCruise's Wilderness ships. Excludes Navigator cabin category.

Valid: Extended through June 14, 2019

Lindblad Offers Half Off or Free Kids' Fares in Alaska

What it is: When two adults pay full fare to sail select Alaska itineraries in 2019, the first child (categorized as age 22 or under) sails for half off, while the fourth passenger 22 years or younger sails for free.

Eligible voyages include: Lindblad's 2019 "Exploring Alaska's Coastal Wilderness" departures, May through September.

Valid: For a limited time only

Save Up to $2,000 on Pearl Seas' Cuba Cruises

What it is: Pearl Seas Cruises is offering up to $2,000 on their cultural voyages to Cuba.

Eligible voyages include: Select 2019 sailings to Cuba

Valid: Depending on availability

Ponant Offers Up to 30% Off Select Departures to South America, the Med & More

What it is: Select Ponant sailings are up to 30 percent off, including Central and South America in 2019, and the Mediterranean in 2020. Additional incentives available for early bookings.

Eligible voyages include: A variety of available itineraries through 2019/2020 including the 14-day Chilean Fjords & Patagonia sailing on Le Boreal and the October 11th Canary Islands and Cape Verde cruise in 2020.

Valid: Depending on availability

Variety Cruises Discounts Exotic Destinations By Up to 50%

What it is: Variety Cruises is now offering discounts of up to 50 percent per person (double occupancy) or a 10 percent or waived single supplement on select summer 2019 itineraries and departures.

Eligible voyages include: Bali and the Indonesian Islands, the Adriatic Sea, Spain & Portugal, Seychelles, Iceland and more sailings with departures this summer.

Valid: Depending on availability

Bahamas Paradise Offers Free Drinks, OBC and More

What it is: Bahamas Paradise Cruise Line is offering a "Triple Play" package on select 2019 sailings. Offer includes five free drinks, $25 onboard credit and $50 casino match play.

Eligible voyages include: Select two-night cruises in an oceanview room or above on 2019 sailings out of Palm Beach. Prices start from $159 per person.

Valid: For a limited time only

Scenic River Offers Your Choice of Perk This Spring

What it is: Book your next luxury river cruise with Scenic and earn up to $3,000 per person (on itineraries of 15 days or more). Expect $2,000 per person on itineraries 11 to 14 days and $1,500 per person on eight- to 10-day sailings.

Eligible voyages include: A variety of 2019 sailings in Europe and beyond

Valid: Ongoing

Save 15% on CroisiEurope 2020 European Cruises

What it is: Book a Croisi sailing in Europe by the end of the summer and save on 2020 river voyages to the Rhine, Danube, Loire, Elbe and more.

Eligible voyages include: Nearly 200 sailing in Europe in 2020

Valid: Through August 31, 2019