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View Deal →Costa Diadema vs Sky Princess
Side-by-side cruise ship comparison · Updated April 2026
Sky Princess is the larger vessel at 145,000 GT, 9% more than Costa Diadema's 132,500 GT. Sky Princess offers more personal space with a space ratio of 39.6 GT per passenger versus 35.6. Built in 2019, Sky Princess is 5 years newer, an advantage for travellers seeking modern amenities and design.
Score: 0 – 7
Quick Compare
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Category
Costa Diadema
Sky Princess
Size
132,500 GT
145,000 GT
Passengers
3,724
3,660
Year Built
2014
2019
Crew Ratio
1:3.0
1:2.7
Space Ratio
35.6
39.6
Decks
—
—
Length
306m
330m
From Price
$316.36/pp
$838.25/pp
Comparison Verdict
Sky Princess is the larger vessel at 145,000 GT, 9% more than Costa Diadema's 132,500 GT. Sky Princess offers more personal space with a space ratio of 39.6 GT per passenger versus 35.6. Built in 2019, Sky Princess is 5 years newer, an advantage for travellers seeking modern amenities and design.
| Category | Winner |
|---|---|
| Size | Sky Princess |
| Capacity | Sky Princess |
| Modernity | Sky Princess |
| Service | Sky Princess |
| Spaciousness | Sky Princess |
| Decks | Tie |
| Length | Sky Princess |
| Fleet Power | Sky Princess |
Bottom line: Sky Princess leads 7–0 across our categories, strongest in Size. Choose Sky Princess for overall superiority; pick Costa Diadema if its strengths matter more to you.
Which Ship Is Right for You?
Choose Costa Diadema if...
- More onboard variety (3,724 guests)
- Save $521.89/person on sailings
Choose Sky Princess if...
- You want the newer ship (built 2019, 5yr newer)
- Size matters to you (145,000 GT)
- Better service ratio (2.7:1 crew ratio)
- More space per guest (39.6 GT/pax)
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Upcoming Sailings on Costa Diadema
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View Deal →Upcoming Sailings on Sky Princess
Leaves in 15 days$2,874/person$205/night
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Frequently Asked Questions
How is the comparison score calculated?
We compute scores across 8 categories using real spec data: gross tonnage, passenger capacity, crew capacity, year built, length, deck count, space ratio, and fleet power. Each category awards one point to the winning ship.
What is the space ratio and why does it matter?
Space ratio is gross tonnage divided by passenger capacity. A higher number means more space per guest. Luxury lines typically score above 40; mass-market ships often fall in the 30-40 range.
What does the passenger-to-crew ratio mean?
Passengers per crew member. Lower is better, more staff per guest means better service. Luxury lines aim below 2:1; large mainstream ships may be 3-4:1.
Are the prices shown accurate?
Prices are sourced from Cruisebound and reflect real-time availability. They may change based on cabin type, date, and demand. Click through to see the latest fares.
Can I compare more than two ships?
Yes, up to four ships. Use the search tool on the compare hub page to add additional ships.
How current is the ship data?
Specifications come from our database of 380+ vessels, revalidated every 5 minutes via ISR. The "Updated" timestamp shows when records were last modified.
