$341/person$85/night
View DealShip comparison
Costa Diadema vs Legend of the Seas
Side-by-side cruise ship comparison. Legend of the Seas wins 5 of 7 scored categories.
At a glance
Quick Compare
Category
Costa Diadema
Legend of the Seas
Size
132,500 GT
250,800 GT
Passengers
3,724
7,600
Year built
2014
2026
Crew ratio
3.0 guests per crew
3.2 guests per crew
Space ratio
35.6 GT per guest
33.0 GT per guest
Decks
No data
No data
Length
306 m
365 m
From price
$167 pp
$719.01 pp
The verdict
Comparison Verdict
Legend of the Seas is the significantly larger vessel at 250,800 GT, 89% more than Costa Diadema's 132,500 GT. Built in 2026, Legend of the Seas is 12 years newer, an advantage for travelers seeking modern amenities and design. Costa Diadema edges ahead in service at 3.0 guests per crew, meaning more crew per guest.
| Category | Winner |
|---|---|
| Size | Legend of the Seas |
| Capacity | Legend of the Seas |
| Modernity | Legend of the Seas |
| Service | Costa Diadema |
| Spaciousness | Costa Diadema |
| Decks | No data |
| Length | Legend of the Seas |
| Fleet Power | Legend of the Seas |
Bottom line: Legend of the Seas leads 5–2 across our categories, strongest in Size. Choose Legend of the Seas for overall superiority; pick Costa Diadema if Service matter more to you.
Decide
Which Ship Is Right for You?
Choose Costa Diadema if
- More crew per guest (3.0 guests per crew)
- More space per guest (35.6 GT per guest)
- Lower fares per night (from $84 per person per night)
Choose Legend of the Seas if
- You want the newer ship (built 2026, 12 years newer)
- Size matters to you (250,800 GT)
- More onboard variety (7,600 guests)
Prices
See Current Prices
You have compared the ships. Now see what they cost.
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Fares
Sailing Prices
| Detail | Costa Diadema | Legend of the Seas |
|---|---|---|
| Cheapest | $167 pp | $719.01 pp |
| Per night | $84 pp | $240 pp |
| Departing | Oct 29 | Nov 8 |
| Duration | 2 nights | 3 nights |
| View sailing | View sailing |
Prices from Cruisebound, per person, for the sailing shown.
Go deeper
Deep Dive
Sailings
Upcoming Sailings
Upcoming Sailings on Legend of the Seas
3 Night Perfect Day Getaway Cruise
Royal Caribbean • Legend Of The Seas
Nov 8, 2026 · 3 nights
Caribbean
$719/person$240/night
View Deal
$732/person
View Deal
$1,329/person
View DealFAQ
Frequently Asked Questions
How is the comparison score calculated?
We score 8 categories from spec data: size, capacity, modernity, service, spaciousness, decks, length and fleet power. Each category awards one point to the winning ship. A category where either ship has no data is marked No data and left out of the score.
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, and mass-market ships often fall between 30 and 40.
What does the passenger-to-crew ratio mean?
It is the number of guests for each crew member, shown as "3.0 guests per crew". Lower is better: more staff per guest usually means more attentive service. Luxury lines aim for fewer than 2 guests per crew, and large mainstream ships often carry 3 to 4.
Are the prices shown accurate?
Prices come from Cruisebound and are per person for the sailing shown. They change with cabin type, date and demand, so open the sailing to see the current fare.
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+ ships, and this page refreshes daily. An "Updated" date appears at the top when either ship's record changed in the last 30 days.
