Costa Diadema

Longest voyage — 24 nights visiting 14 ports on Costa Diadema.

By the numbers

132,500 GT

Tonnage

4,947

Guests

2013

Built

Decks

1,886

Cabins

1,003ft

Length · 306 m

More specifications

1,253

Crew

5 star

Rating

About Costa Diadema

Costa Diadema, launched in 2014, is built for relaxation and fun with lots of on-board activities, scintillating bars, gourmet restaurants and the spa area. Among the special features not to be missed: an entire deck dedicated to children with castle and pirate galleon and the terrace on deck 5 for strolling and enjoying an aperitif at sunset: a real treat for holidaying in perfect Italian style. The cabins aboard our Flagship are elegant, well-appointed and spacious for up to five guests. At any time of the day or night you'll be spoilt for choice on what to do: sports, games, a large three-story theatre that welcomes international artists, and you too can take to the stage with Tu sì que Vales... and then the Aperol Spritz Bar for a cocktail before dancing the night away at the disco, a games room for returning to your childhood and a real German pub. We look forward to welcoming you on board. Now take a look at the current position of Costa Diadema.

Where Costa Diadema sails

Ports Costa Diadema visits

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Ship gallery

Deck plans

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Sailing soon on Costa Diadema

Prices per person · incl. taxes & fees.

Showing 207 Costa Diadema sailings

Open in full search

From pp	Destination	Departs	Nights
from $1,865 $266 / night	Scandinavia	Jun 26, 2026	7
from $1,755 $250 / night	Scandinavia	Jun 27, 2026	7
from $1,918 $274 / night	Scandinavia	Jul 3, 2026	7
from $2,117 $302 / night	Scandinavia	Jul 4, 2026	7
from $1,928 $275 / night	Scandinavia	Jul 10, 2026	7
from $1,947 $278 / night	Scandinavia	Jul 11, 2026	7
from $2,176 $310 / night	Scandinavia	Jul 17, 2026	7
from $2,146 $306 / night	Scandinavia	Jul 18, 2026	7
from $2,285 $326 / night	Scandinavia	Jul 24, 2026	7
from $2,415 $345 / night	Scandinavia	Jul 25, 2026	7
from $2,388 $341 / night	Scandinavia	Jul 31, 2026	7
from $2,317 $331 / night	Scandinavia	Aug 1, 2026	7
from $2,318 $331 / night	Scandinavia	Aug 7, 2026	7
from $2,437 $348 / night	Scandinavia	Aug 8, 2026	7
from $2,288 $326 / night	Scandinavia	Aug 14, 2026	7
from $2,317 $331 / night	Scandinavia	Aug 15, 2026	7
from $1,868 $266 / night	Scandinavia	Aug 21, 2026	7
from $1,977 $282 / night	Scandinavia	Aug 22, 2026	7
from $1,735 $247 / night	Scandinavia	Aug 28, 2026	7
from $1,785 $255 / night	Scandinavia	Aug 29, 2026	7

See all 207 upcoming sailings on Costa Diadema

Frequently asked questions

What is Costa Diadema?

Costa Diadema is a Dream-class ship operated by Costa Crociere and owned by Carnival Corporation. At the time of her October 2014 delivery she was the largest vessel ever to fly an Italian flag and Costa's largest ship. She is 133,019 GT, carries up to 4,947 passengers, and is currently deployed in South America.

What activities and recreation are on Costa Diadema?

Costa Diadema has three swimming pools and an outside promenade extending over 500 metres.

What are the staterooms like on Costa Diadema?

Costa Diadema has 1,862 cabins carrying up to 4,947 passengers. The ship has a six-generator electrical system supplied by General Electric.

Where does Costa Diadema sail?

Costa Diadema's inaugural seasons were in the Western Mediterranean. From November 2018 she began rotating between the Mediterranean (spring/summer) and the Persian Gulf (fall/winter). As of April 2026 she is operating short South American itineraries from Itajai and Santos, with a repositioning to Kiel and Copenhagen for Northern European fjords sailings planned from May 2026.

What is the history of Costa Diadema?

The keel was laid on 10 December 2012 at Fincantieri's Marghera shipyard. She was launched on 15 November 2013, delivered 25 October 2014, and performed a Vernissage Cruise from Trieste to Genoa on 1 November. Her naming ceremony was held on 7 November 2014 at the Port of Genoa, where she was christened by Italian travel agent Carolina Micelli.