Costa Diadema is the elegant Italian-style flagship of Costa's pre-Smeralda era, carrying up to 4,947 guests. She sails the Mediterranean in autumn, from Savona and Barcelona among others, and Northern Europe from Kiel and Copenhagen in summer 2027. Highlights include a 500-metre outdoor promenade and a sprawling four-deck Samsara spa.
Ship Details
Ship Amenities
Pools & Sun Decks
Three swimming pools — one with a retractable roof — plus eight hot tubs and a multi-sport pitch
Restaurants & Bars
Seven restaurants and 15 bars, from authentic Italian classics to teppanyaki and pizza by the slice
Samsara Spa
A 7,800 m² wellness area across four decks with thalassotherapy, sauna, steam room and gym
Entertainment
Three-deck theatre, 4D cinema, casino and live Italian-style shows every evening
Family & Kids
Squok kids' club and dedicated programs for children and teens across age groups
Deck Plans
Available cruises
Costa Diadema12 days Transoceanic
Santa Cruz de Tenerife (Canary Islands), Spain - Santos (Sao Paolo), Brazil
11 Nov 2026 - 23 Nov 2026
Costa Diadema8 days Transoceanic
Porto (Leixoes), Portugal - Kiel, Germany
22 Apr 2027 - 30 Apr 2027
Costa Diadema11 days Transoceanic
Santa Cruz de Tenerife (Canary Islands), Spain - Rio de Janeiro, Brazil
11 Nov 2026 - 22 Nov 2026
Costa Diadema4 days Transoceanic
Dover (London), United Kingdom - Kiel, Germany
26 Apr 2027 - 30 Apr 2027
Costa Diadema11 days Mediterranean
Marseille (Provence), France
2 Nov 2027 - 13 Nov 2027
Costa Diadema11 days Mediterranean
Savona, Italy
3 Nov 2027 - 14 Nov 2027
Frequently Asked Questions
Costa Diadema is ideal for guests who want classic Italian cruising at its finest — elegant interiors, gourmet Italian cuisine and warm Mediterranean hospitality. With a vast spa, plenty of dining choices and dedicated kids' programs, it suits couples, families and solo travelers alike.
The ship offers three swimming pools (one with a retractable roof), the four-deck Samsara spa, a 500-metre outdoor promenade, a 4D cinema, a multi-sport pitch and 15 bars. Italian gastronomy is everywhere — from artisan gelato and espresso to seven restaurants including teppanyaki and a steakhouse.