2 Night Perfect Day Getaway Cruise
Royal Caribbean • Harmony of the Seas
Oct 29, 2026 · 2 nights
Caribbean
$249/person$124/night
View DealShip comparison
Harmony of the Seas vs MSC Seaside
Side-by-side cruise ship comparison. Harmony of the Seas wins 6 of 7 scored categories.
At a glance
Quick Compare
Category
Harmony of the Seas
MSC Seaside
Size
226,963 GT
153,516 GT
Passengers
6,687
5,179
Year built
2016
2017
Crew ratio
3.2 guests per crew
3.7 guests per crew
Space ratio
33.9 GT per guest
29.6 GT per guest
Decks
No data
No data
Length
362 m
323 m
From price
$248.66 pp
$195.8 pp
The verdict
Comparison Verdict
Harmony of the Seas is the significantly larger vessel at 226,963 GT, 48% more than MSC Seaside's 153,516 GT. Harmony of the Seas offers more personal space with a space ratio of 33.9 GT per passenger versus 29.6. Harmony of the Seas edges ahead in service at 3.2 guests per crew, meaning more crew per guest.
| Category | Winner |
|---|---|
| Size | Harmony of the Seas |
| Capacity | Harmony of the Seas |
| Modernity | MSC Seaside |
| Service | Harmony of the Seas |
| Spaciousness | Harmony of the Seas |
| Decks | No data |
| Length | Harmony of the Seas |
| Fleet Power | Harmony of the Seas |
Bottom line: Harmony of the Seas leads 6–1 across our categories, strongest in Size. Choose Harmony of the Seas for overall superiority; pick MSC Seaside if its strengths matter more to you.
Decide
Which Ship Is Right for You?
Choose Harmony of the Seas if
- Size matters to you (226,963 GT)
- More onboard variety (6,687 guests)
- More crew per guest (3.2 guests per crew)
- More space per guest (33.9 GT per guest)
Choose MSC Seaside if
- You want the newer ship (built 2017, 1 year newer)
- Lower fares per night (from $49 per person per night)
Prices
See Current Prices
You have compared the ships. Now see what they cost.
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Fares
Sailing Prices
| Detail | Harmony of the Seas | MSC Seaside |
|---|---|---|
| Cheapest | $248.66 pp | $195.8 pp |
| Per night | $124 pp | $49 pp |
| Departing | Oct 29 | Nov 2 |
| Duration | 2 nights | 4 nights |
| View sailing | View sailing |
Prices from Cruisebound, per person, for the sailing shown.
Go deeper
Deep Dive
Sailings
Upcoming Sailings
Upcoming Sailings on Harmony of the Seas
5 Night Bahamas & Perfect Day Cruise
Royal Caribbean • Harmony of the Seas
Oct 31, 2026 · 5 nights
Caribbean
$2,618/person$524/night
View Deal
5 Night Bahamas & Perfect Day Cruise
Royal Caribbean • Harmony of the Seas
Nov 5, 2026 · 5 nights
Bahamas
$2,870/person$574/night
View DealUpcoming Sailings on MSC Seaside
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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.
