$217/person$72/night
View DealShip comparison
Costa Diadema vs Queen Mary 2
Side-by-side cruise ship comparison. Queen Mary 2 wins 4 of 7 scored categories.
At a glance
Quick Compare
Category
Costa Diadema
Queen Mary 2
Size
132,500 GT
148,528 GT
Passengers
3,724
2,691
Year built
2014
2004
Crew ratio
3.0 guests per crew
2.1 guests per crew
Space ratio
35.6 GT per guest
55.2 GT per guest
Decks
No data
No data
Length
306 m
345 m
From price
$217 pp
$489 pp
The verdict
Comparison Verdict
Queen Mary 2 is the larger vessel at 148,528 GT, 12% more than Costa Diadema's 132,500 GT. Queen Mary 2 offers more personal space with a space ratio of 55.2 GT per passenger versus 35.6. Built in 2014, Costa Diadema is 10 years newer, an advantage for travelers seeking modern amenities and design.
| Category | Winner |
|---|---|
| Size | Queen Mary 2 |
| Capacity | Costa Diadema |
| Modernity | Costa Diadema |
| Service | Queen Mary 2 |
| Spaciousness | Queen Mary 2 |
| Decks | No data |
| Length | Queen Mary 2 |
| Fleet Power | Costa Diadema |
Bottom line: Queen Mary 2 leads 4–3 across our categories, strongest in Size. Choose Queen Mary 2 for overall superiority; pick Costa Diadema if Capacity matter more to you.
Decide
Which Ship Is Right for You?
Choose Costa Diadema if
- You want the newer ship (built 2014, 10 years newer)
- More onboard variety (3,724 guests)
Choose Queen Mary 2 if
- Size matters to you (148,528 GT)
- More crew per guest (2.1 guests per crew)
- More space per guest (55.2 GT per guest)
- Lower fares per night (from $70 per person per night)
Prices
See Current Prices
You have compared the ships. Now see what they cost.
Cruise and flight packages
We may earn a commission from partner bookings at no extra cost to you.
Fares
Sailing Prices
| Detail | Costa Diadema | Queen Mary 2 |
|---|---|---|
| Cheapest | $217 pp | $489 pp |
| Per night | $72 pp | $70 pp |
| Departing | Oct 28 | Oct 30 |
| Duration | 3 nights | 7 nights |
| View sailing | View sailing |
Prices from Cruisebound, per person, for the sailing shown.
Go deeper
Deep Dive
Sailings
Upcoming Sailings
Upcoming Sailings on Queen Mary 2
Hotels & Accommodations Near Port of Marseille
Compare prices from 100+ booking sites
FAQ
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.
