Costa
Diadema

About Costa Diadema Cruises

Diadema is a Costa ship and is best known for its sailings to Europe and South America. CruiseSheet currently lists 182 cruises from Diadema beginning at just $393.

The Diadema Costa, based in Europe and refurbished just three years ago in 2023, is a Dream class vessel that can carry over 3,700 people.

The Diadema Costa wows guests with a roller skating rink, an outdoor movie theater, a casino, a jacuzzi, a gym, a solarium, and a spa.

Costa Diadema

Best Diadema Cruise Deals

6 Night Savona to Lisbon cruise
November 2, 2026
Costa Diadema
S M L XL
Savona → Barcelona → Malaga → Cadiz → Lisbon
$450
$75 per day
Inside
6 Night Savona to Lisbon cruise
November 2, 2026
Costa Diadema
S M L XL
Savona → Barcelona → Malaga → Cadiz → Lisbon
$450
$75 per day
Inside
21 Night Marseille to Rio cruise
November 1, 2026
Costa Diadema
S M L XL
Marseille → Savona → Barcelona → Malaga → Cadiz → Lisbon → Las Palmas → Tenerife → Mindelo → Maceió → Salvador → Rio
$2,081
$99 per day
Inside
21 Night Marseille to Rio cruise
November 1, 2026
Costa Diadema
S M L XL
Marseille → Savona → Barcelona → Malaga → Cadiz → Lisbon → Las Palmas → Tenerife → Mindelo → Maceió → Salvador → Rio
$2,081
$99 per day
Inside
25 Night Rio to Kiel cruise
April 5, 2027
Costa Diadema
S M L XL
Rio → Salvador → Maceió → Praia → Las Palmas → Casablanca → Malaga → Oporto → Vigo → Paris → London → Aarhus → Kiel
$2,454
$98 per day
Inside
25 Night Rio to Kiel cruise
April 5, 2027
Costa Diadema
S M L XL
Rio → Salvador → Maceió → Praia → Las Palmas → Casablanca → Malaga → Oporto → Vigo → Paris → London → Aarhus → Kiel
$2,454
$98 per day
Inside
20 Night Savona to Rio cruise
November 2, 2026
Costa Diadema
S M L XL
Savona → Barcelona → Malaga → Cadiz → Lisbon → Las Palmas → Tenerife → Mindelo → Maceió → Salvador → Rio
$2,006
$100 per day
Inside
20 Night Savona to Rio cruise
November 2, 2026
Costa Diadema
S M L XL
Savona → Barcelona → Malaga → Cadiz → Lisbon → Las Palmas → Tenerife → Mindelo → Maceió → Salvador → Rio
$2,006
$100 per day
Inside
19 Night Barcelona to Rio cruise
November 3, 2026
Costa Diadema
S M L XL
Barcelona → Malaga → Cadiz → Lisbon → Las Palmas → Tenerife → Mindelo → Maceió → Salvador → Rio
$1,914
$101 per day
Inside
19 Night Barcelona to Rio cruise
November 3, 2026
Costa Diadema
S M L XL
Barcelona → Malaga → Cadiz → Lisbon → Las Palmas → Tenerife → Mindelo → Maceió → Salvador → Rio
$1,914
$101 per day
Inside
Browse More Diadema Deals

Last Minute Diadema Cruise Deals

12 Night Kiel to Savona cruise
September 11, 2026
Costa Diadema
S M L XL
Kiel → Copenhagen → Kristiansand → Paris → Vigo → Malaga → Alicante → Barcelona → Marseille → Savona
$1,549
$129 per day
Inside
12 Night Kiel to Savona cruise
September 11, 2026
Costa Diadema
S M L XL
Kiel → Copenhagen → Kristiansand → Paris → Vigo → Malaga → Alicante → Barcelona → Marseille → Savona
$1,549
$129 per day
Inside
11 Night Kiel to Marseille cruise
September 11, 2026
Costa Diadema
S M L XL
Kiel → Copenhagen → Kristiansand → Paris → Vigo → Malaga → Alicante → Barcelona → Marseille
$1,449
$132 per day
Inside
11 Night Kiel to Marseille cruise
September 11, 2026
Costa Diadema
S M L XL
Kiel → Copenhagen → Kristiansand → Paris → Vigo → Malaga → Alicante → Barcelona → Marseille
$1,449
$132 per day
Inside
11 Night Copenhagen to Savona cruise
September 12, 2026
Costa Diadema
S M L XL
Copenhagen → Kristiansand → Paris → Vigo → Malaga → Alicante → Barcelona → Marseille → Savona
$1,462
$133 per day
Inside
11 Night Copenhagen to Savona cruise
September 12, 2026
Costa Diadema
S M L XL
Copenhagen → Kristiansand → Paris → Vigo → Malaga → Alicante → Barcelona → Marseille → Savona
$1,462
$133 per day
Inside
10 Night Kiel to Barcelona cruise
September 11, 2026
Costa Diadema
S M L XL
Kiel → Copenhagen → Kristiansand → Paris → Vigo → Malaga → Alicante → Barcelona
$1,333
$133 per day
Inside
10 Night Kiel to Barcelona cruise
September 11, 2026
Costa Diadema
S M L XL
Kiel → Copenhagen → Kristiansand → Paris → Vigo → Malaga → Alicante → Barcelona
$1,333
$133 per day
Inside
9 Night Copenhagen to Barcelona cruise
September 12, 2026
Costa Diadema
S M L XL
Copenhagen → Kristiansand → Paris → Vigo → Malaga → Alicante → Barcelona
$1,216
$135 per day
Inside
9 Night Copenhagen to Barcelona cruise
September 12, 2026
Costa Diadema
S M L XL
Copenhagen → Kristiansand → Paris → Vigo → Malaga → Alicante → Barcelona
$1,216
$135 per day
Inside
See More Last Minute Diadema deals

Monthly Diadema Pricing

On average sailings on Diadema are somewhat inexpensive compared to other ships. Diadema cruises during the the peak season of summer are significantly more expensive than the the low season of fall. Look at the diagram below for the average cost per day by month.

Jan
$183
Feb
$170
Mar
$192
Apr
$136
May
$179
Jun
$212
Jul
$246
Aug
$255
Sep
$161
Oct
$159
Nov
Dec

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