Quick Answer
Sun Princess and Star Princess share the Sphere Class platform, including the glass Piazza, configurable Princess Arena, The Dome, three-level dining room, 2,157 staterooms, and Sanctuary Collection concept. Their most important booking differences are the actual destination season, date, airfare, available cabin, current entertainment and dining lineup, and selected refinements such as Star’s expanded non-smoking casino area. Choose the dated sailing and room that fit; do not assume Star is categorically better because it launched later.
Last Reviewed / Sources Checked
USCRUISE checked the linked official sources on August 22, 2026. Policies, prices, ship features, terminal assignments, schedules, entry rules, and package benefits can change by sailing, market, booking date, weather, and passenger eligibility.
Who This Guide Is For
This guide is for couples, families, Alaska and Caribbean shoppers, Sanctuary Collection buyers, and Princess loyalists deciding between the two Sphere Class ships. It is designed for travelers who need to understand whether a newer ship-specific refinement matters more than route, climate, balcony use, exact cabin placement, or a substantial fare difference.
Key Facts Table
| Decision factor | What to know |
|---|---|
| Ship class | Sun and Star are Sphere Class sister ships with the same headline architecture and published core capacity. |
| Shared platform | Princess lists the Piazza, Arena, Dome, three-level dining, 2,157 staterooms, and Sanctuary Collection on both. |
| Route difference | Current destination deployment differs by season; compare the exact itinerary rather than a permanent ship label. |
| Cabin families | Both offer Cove Balcony, Cabana Mini-Suite, and Sanctuary categories, but live inventory and deck context vary. |
| Refinements | Star’s current fact sheet identifies selected changes, including an expanded non-smoking casino area and current venue lineup. |
| Dynamic facts | Restaurants, entertainment, operating hours, packages, and itinerary details can change after publication. |
Best For / Not Ideal For
Sun is best when its current Mediterranean, Caribbean, or transatlantic schedule and room value fit. Star is best when its current Alaska, Caribbean, or other deployment, newer refinements, and available cabin better serve the trip. Either fits travelers who want a large modern Princess ship with strong views and multiple accommodation products. Neither is ideal for buyers expecting a traditional smaller Princess layout, unrestricted access to Sanctuary spaces, or a guarantee that every launch-era venue remains unchanged.
Detailed Comparison
Choose destination before sister ship
Open two current itineraries and compare embarkation city, travel days, ports, scenic cruising, sea days, arrival times, and climate. Star’s Alaska deployment can make outdoor viewing, covered space, port timing, and airfare central; Sun’s current seasonal routes can create different priorities. The ship cannot compensate for an itinerary the traveler does not want. Record whether the voyage is round-trip or one-way and price pre- and post-cruise hotels and transfers. Deployment is not permanent, so the dated Princess booking page must override broad statements about where either ship sails.
Understand what Sphere Class makes the same
Both ships center the Piazza inside the glass Sphere, use the configurable Princess Arena, feature The Dome, and share the broad three-level dining and accommodation concept. Treat these as common features. Similar published guest capacity and deck count do not guarantee an identical daily experience, but they do mean buyers should not describe Star as a different class. Compare walking routes, elevator banks, venue reservations, and crowd-sensitive times using current deck plans rather than extrapolating from a smaller Royal Class ship.
Compare current entertainment and venue refinements
Princess’s current fact sheets document the ship-specific entertainment, retail, casino, and dining lineup. Star’s materials identify an expanded non-smoking casino area and its current Spellbound and entertainment program. Sun has its own operational schedule and may receive changes over time. Decide whether any difference is a genuine priority. A venue name in a fact sheet does not guarantee availability on every night, included admission, or a reservation. Confirm through Cruise Personalizer and the MedallionClass app for the selected voyage.
Select the cabin product for the climate
Compare Cove Balcony, standard balcony, Cabana Mini-Suite, Cabana Deck Mini-Suite, Sanctuary Mini-Suite, suite, and other available categories using the exact deck plan. An outdoor cabana or balcony may be valued differently in Alaska wind and rain than in the Caribbean; a covered or lower location may be attractive for one guest and limiting for another. Check occupancy, sofa and berth arrangement, balcony exposure, shared cabana-deck access, obstruction, and noise adjacency. Sanctuary benefits belong only to eligible booked categories under current terms.
Audit dining access and package overlap
Both ships advertise a large restaurant and bar mix, including included dining and extra-cost concepts. Compare current main-dining format, specialty venues, reservations, package treatment, service charges, dietary support, and the value of Princess Plus or Premier separately from the cabin. Sanctuary Collection includes specific dining and package benefits that should not be counted twice. A restaurant count is not a value calculation. Build three realistic dining days and check whether the preferred venue is included, available, and practical around port times and shows.
Price the exact room and operational risk
Use equal occupancy, cabin, deposit, promotion, package, and cancellation terms. Add taxes, gratuities, airfare, hotel, transfers, excursions, insurance, dining, and connectivity. Star may command a premium while Sun may offer a better room or schedule; neither is guaranteed. Identify the verified benefit earning any difference. A resilient decision still works if one venue closes or the route changes.
USCRUISE Expert Tip
First delete every shared Sphere Class feature from the comparison. Then score only four variables: itinerary, exact cabin, travel logistics, and current ship-specific venue differences. Give itinerary and cabin twice the weight of novelty. If Star wins only because it is newer, reprice Sun in the same practical room. If Sun wins only on fare but creates a poor route or cabin, calculate the real cost of that compromise.
Decision Matrix
| Traveler or priority | Practical action |
|---|---|
| Alaska scenery is the main goal | Compare Star’s exact Alaska itinerary, scenic days, cabin exposure, and travel logistics. |
| Mediterranean or transatlantic date fits | Use Sun’s current sailing details rather than a generic ship comparison. |
| Sanctuary experience matters | Verify the exact eligible category, included package, restaurant access, and total room price. |
| Casino smoke exposure matters | Review the current ship plan and Star’s published non-smoking expansion; policies can change. |
| Sister-ship features feel equal | Let the better itinerary, room, airfare, and total cost decide. |
Common Mistakes
Calling Star Princess a different ship class
Paying a new-ship premium for features shared with Sun
Assuming a cabana or balcony has equal value in every climate
Counting Sanctuary or package benefits twice
Using launch announcements as a permanent venue schedule
Ignoring one-way transfers, hotels, and airfare in itinerary comparisons
Frequently Asked Questions
Are Sun Princess and Star Princess the same size?
Princess’s current fact materials describe both as Sphere Class ships with the same published guest capacity, stateroom count, and headline architecture. Exact operational details and current venues still differ.
Which ship is newer?
Star Princess entered service after Sun Princess. Newer does not by itself establish better value; compare the date, route, exact room, current lineup, and complete cost.
Do both ships have The Dome and the Sphere?
Yes. Princess identifies The Dome, glass Piazza within the Sphere, and Princess Arena as shared concepts. Schedules and uses of these spaces can vary.
Which is better for Alaska?
The ship actually scheduled on the preferred Alaska itinerary is the relevant choice. Compare scenic cruising, ports, one-way logistics, cabin exposure, and indoor viewing rather than the ship name alone.
Do both offer Sanctuary Collection?
Yes, but eligibility attaches to specific booked staterooms and current benefits. Verify the category and confirmation; ordinary cabin guests should not assume access.
Is dining identical?
The broad platform is similar, but current venues, menus, operating nights, reservations, and package treatment can change. Check the selected voyage in Princess’s current tools.
Related Guides
Sun Princess Guide: Cabins, Dining, Piazza, and Sanctuary Collection
Star Princess Guide: Cabins, Dining, The Dome, and Sanctuary Collection
Best Cabins on Star Princess: Cabana, Cove Balcony, Sanctuary, and Suite Choices
Plan Your Cruise with USCRUISE
USCRUISE can compare current Sun and Star Princess itineraries, cabin categories, Sanctuary treatment, packages, flights, and the complete trip price. Request personalized cruise help.
Sources & Methodology
USCRUISE used Princess’s current ship pages and fact sheets to identify shared Sphere Class attributes and ship-specific refinements. We do not guarantee route, venue, show, menu, package, or cabin inventory. The sailing, deck plan, Cruise Personalizer, app, and confirmation control.
Source check date: August 22, 2026. Confirm the exact ship, sailing, fare, terminal, passenger details, and current terms before purchase.
