You generally have to be 18 to go on a cruise from the UK and Europe, and 21 to sail on most cruises departing from the US — though under-18s and under-21s can cruise when accompanied by a parent or guardian. Most major cruise lines, including P&O Cruises, Cunard, Royal Caribbean, and MSC, set 18 as the minimum age to travel in a cabin without an adult, with infants under 6 months (12 months for transatlantic crossings) not permitted to sail at all.
Cruise age rules confuse a lot of first-time bookers because they vary by cruise line, departure port, and destination. Whether you’re planning a family holiday, a group trip of young adults, or wondering if your teenager can have their own cabin, this guide gives you the complete answer on how old you have to be to go on a cruise.
Minimum Age Rules by Major Cruise Line
Each cruise line sets its own policy, but the pattern is consistent. Here’s how the big names handle it:
- P&O Cruises — minimum age 18 to travel; under-18s must be accompanied by a parent or guardian. Infants under 6 months cannot sail.
- Cunard — 18+ to travel alone; under-18s need an accompanying adult. No infants under 6 months (12 months on longer voyages).
- Royal Caribbean — 21+ on most sailings from North America; 18+ on sailings from South America, Europe, Asia, and Australia/New Zealand. Under-age guests need a parent, guardian, or responsible adult over 21 in the cabin.
- MSC Cruises — 18+ to travel alone; under-18s must share a cabin with an adult.
- Norwegian Cruise Line — 21+ on US departures, 18+ on European departures.
- Celebrity Cruises — same as Royal Caribbean: 21+ from North America, 18+ from Europe and elsewhere.
The key takeaway: cruises departing from UK and European ports almost always use 18 as the threshold, while US departures use 21 — largely because of American drinking-age laws.
Can Under-18s Go on a Cruise?
Absolutely — cruising is one of the most family-friendly holidays available. Children and teenagers are welcome on virtually all mainstream cruise lines as long as they’re accompanied by a parent or legal guardian. Most ships have excellent kids’ clubs (usually split by age group), teen lounges, and family activities.
The main restrictions for under-18s relate to independence rather than access: they can’t book or occupy a cabin alone, and most lines require under-18s to be back in their cabin or with family by a certain time at night. Some lines also restrict under-16s from using gyms or spas. Babies are welcome from 6 months on most itineraries, though transatlantic and exotic longer voyages often require infants to be at least 12 months old.
Can 18–20 Year Olds Cruise Alone?
On European and UK departures, yes — 18-year-olds can book and sail independently, including occupying their own cabin. This makes cruises a popular option for gap-year travellers and young couples. However, the drinking age on board follows the ship’s policy: most lines set it at 18 on European sailings but 21 on US departures, regardless of where the ship is registered.
On US departures, 18–20 year olds face the strictest rules: they generally must share a cabin with someone 21 or older (a parent, guardian, or spouse). A group of 19-year-olds cannot simply book two cabins on a Caribbean sailing from Miami — the cruise line will refuse boarding. Always check the specific line’s policy for your departure port before booking.
What ID and Documents Do Young Travellers Need?
Everyone on a cruise needs valid travel documents, regardless of age. For UK citizens on European cruises, that’s a passport valid for the duration of the trip (some destinations require 3–6 months’ validity beyond travel dates). Children need their own passports — they can’t travel on a parent’s.
If a child is travelling with only one parent, a grandparent, or another adult, carry a consent letter from the absent parent(s) — some ports and cruise lines ask for it. Check visa requirements for your itinerary well in advance, and make sure travel insurance covers everyone in the party. The gov.uk website has current guidance on passport validity and travelling with children.
Tips for Booking as a Young Adult or Family
- Read the fine print — age policies are in the cruise line’s terms; confirm before paying a deposit.
- Book connecting cabins for teens — adjacent cabins give independence while satisfying supervision rules.
- Check the drinking age for your sailing; it varies by departure region, not just the cruise line.
- Look at youth programmes — the quality of kids’ and teen clubs varies hugely between lines.
- Consider school-holiday pricing — family cruises in August cost far more than term-time sailings.
- Get the right insurance — standard travel insurance sometimes excludes cruises; buy cruise-specific cover.
Frequently Asked Questions
Can a 17-year-old go on a cruise alone?
No — no major cruise line allows under-18s to travel or occupy a cabin without an accompanying adult. A 17-year-old can cruise with a parent, guardian, or (on some lines) a responsible adult over 21.
Can you go on a cruise at 18 in the UK?
Yes. On cruises departing from the UK and Europe, 18 is the standard minimum age to travel independently, and 18-year-olds can book their own cabin on lines like P&O, Cunard, and MSC.
Why is the age limit 21 on American cruises?
US-based cruise lines set 21 as the minimum for unaccompanied travel largely because the onboard drinking age is 21 on US departures, in line with American law. The same cruise lines use 18 for their European sailings.
Can babies go on cruises?
Yes, from 6 months old on most mainstream itineraries (12 months for transatlantic and some exotic voyages). Most large ships offer nurseries, baby food, and family-friendly facilities — check what’s included before booking.
Conclusion
How old you have to be to go on a cruise depends on where you sail from: 18 for UK and European departures, 21 for US departures, with under-18s welcome when accompanied by an adult. Check your cruise line’s exact policy for your sailing, sort passports and insurance early, and you’ll have no surprises at the gangway.
