Costa Cruises
Costa Diadema
- Cruises
- 73
- From
- $490
Ship comparison
Costa Diadema vs MSC World America
MSC Cruises
MSC World America
- Cruises
- 13
- From
- $468
The verdict
Which should you choose?
Costa Diadema is a mega Costa Cruises ship carrying 4,947 passengers, in service since 2014. MSC World America is a mega MSC Cruises ship carrying 5,240 passengers, in service since 2025.
Choose Costa Diadema if you want better-rated dining, more adventure and nature or more culture: it outscores MSC World America for dining (7.0 vs 6.0), adventure & nature (6.0 vs 5.0) and cultural (6.0 vs 5.0) in Cruiseable’s Bliss scores.
Choose MSC World America if you want more space per passenger, more crew per passenger or more of a party: it outscores Costa Diadema for party (9.0 vs 7.0) in Cruiseable’s Bliss scores, it has 41.2 gross tons per passenger (vs 26.8) and it has a crew member for every 2.5 passengers (vs 3.9).
Side by side
Specifications
marks the better figure where more, or less, is plainly better.
| Costa Diadema | MSC World America | |
|---|---|---|
| Cruise line | Costa Cruises | MSC Cruises |
| Ship size | Mega | Mega |
| Maiden voyagenewer highlighted | 2014 | 2025 (better) |
| Gross tonnage | 132,500 | 215,863 |
| Passengers | 4,947 | 5,240 |
| Crew | 1,253 | 2,138 |
| Passengers per crew memberfewer is better | 3.9 | 2.5 (better) |
| Space per passengergross tons per passenger; more is roomier | 26.8 | 41.2 (better) |
| Decks | 20 | 20 |
| Length | 1,004 ft | 1,093 ft |
| Beam | 122 ft | 154 ft |
| Speed | — | 26 mph |
| Cruiseable ratingout of 10 | 8 / 10 | 8 / 10 |
| Cruises on sale | 73 | 13 |
| Upcoming sailings | 143 | 206 |
| Cruise lengths | 2 to 27 nights | 6 to 15 nights |
| Fares fromlower highlighted | $490 | $468 (better) |
Bliss scores
How they rate, out of 10
Cruiseable rates ships out of 10 on ten parts of a cruise holiday. Costa Diadema leads on 3 of the ten, MSC World America on 2, with 5 level.
- Active
- Adventure & nature
- Cultural
- Dining
- Entertainment
- Family friendly
- Party
- Romantic
- Spa & fitness
- Staterooms
Costa Cruises
Costa Diadema
Sailing now
73 cruises on sale, from $490.
MSC Cruises
MSC World America
MSC World America became a notable addition to the MSC Cruises fleet in April 2025 with voyages from Miami to the Caribbean. This ship is the Swiss-based cruise line's second World Class ship, marking a milestone as the first in the class dedicated specifically to the U.S. market.
Sailing now
13 cruises on sale, from $468.
Questions
Costa Diadema or MSC World America?
Which is bigger, Costa Diadema or MSC World America?
MSC World America is bigger at 215,863 gross tons, against 132,500 gross tons for Costa Diadema. Costa Diadema carries 4,947 passengers and MSC World America carries 5,240.
Which ship is newer, Costa Diadema or MSC World America?
MSC World America is newer, with a maiden voyage in 2025 against 2014 for Costa Diadema.
Which has more space per passenger?
MSC World America, with 41.2 gross tons per passenger against 26.8 on Costa Diadema. The higher the figure, the more ship there is for each guest.
Which has more crew per passenger?
MSC World America, with one crew member for every 2.5 passengers against one for every 3.9 on Costa Diadema.
Which is better for families?
MSC World America scores higher for family friendliness in Cruiseable’s Bliss scores: 9.0 out of 10, against 8.0 for Costa Diadema.
Still deciding?
Tell us what matters and we will match the sailing
Send your dates, budget and who is travelling, and our partner travel agency will come back to you about Costa Diadema, MSC World America or a ship that suits you better.