11 Key Differences Between P&O Ships Iona & Britannia

One of P&O Cruises’ newest ships, Iona, launched in 2020 as the first new ship for the cruise line in six years, since Britannia launched in 2015.

These two cruise ships have their similarities, but they are quite unique. If you’re considering booking a cruise with P&O Cruises, it’s a good idea to do some research to make sure that you pick the best ship for your needs.

To help you decide, I’ve created this list of the main differences between the Iona cruise ship and the Britannia cruise ship.

So, it’s Britannia vs Iona – let’s take a look…

Iona cruise ship

1. Iona is a Bigger Ship than Britannia

Iona can accommodate 43% more passengers than Iona, with space for 5,200 guests, compared to Britannia’s guest capacity of 3,647.

The following table shows the size differences between Iona and Britannia:

Guest capacity5,2003,647
Crew capacity1,8001,350
Length344 meters330 meters
Tonnage184,700 tons143,000 tons
Guest decks1513

Iona is currently the eleventh biggest ship in the world, behind Royal Caribbean’s Icon of the Seas, the five mammoth Oasis Class ships, MSC World Europa, sister Arvia and Costa Cruises’ two newest additions, Costa Smeralda and Costa Toscana.

The P&O Iona capacity is so much bigger than on Britannia, which can be both a blessing and a curse. Because it’s a bigger ship, you have more to do, but it can mean bigger crowds too.

2. Iona has No Set Dining Times

When cruising with P&O Cruises on all ships except Iona, guests have the choice of either Club dining or Freedom dining. Iona offers only Freedom dining, which means that there are no set dining times and you will sit at a different table each night.

  • Club Dining – Choose a set time of 6.30pm or 8.30pm. Sit at the same table with the same waiters throughout your cruise
  • Freedom Dining – Arrive at the restaurant at any time between 6pm and 9.30pm

Many cruisers prefer the set dining times of Club dining because they have the opportunity to get to know other cruisers over dinner each night and for conversations to progress past the initial stage. However, others enjoy the flexibility of Freedom dining and the chance to meet new people each night.

3. Iona is Better for Cold-Weather Cruises

With its glass-roofed SkyDome, Iona is the ideal ship for cooler weather. The ship also has a four-screen cinema complex offering movie screenings throughout the day.

In contrast, cruisers sailing on Britannia in cold weather may find that the indoor activities are somewhat limited in comparison.

Sky Dome on Iona
Iona’s SkyDome

When you look at the itineraries that are on offer on each ship, you can see that Britannia offers more warm-weather itineraries than Iona.

Britannia Itineraries

Britannia cruises from Southampton in the summer, sailing to destinations such as Spain, Portugal, the Canary Islands. In the winter, she heads transatlantic to offer Caribbean cruises departing from Barbados and St Lucia.

Iona Itineraries

Iona cruises from Southampton all year round, heading to destinations such as Norway, Northern Europe, Spain, Portugal and the Canary Islands.


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4. Britannia has More Formal Nights than Iona

Whilst Iona does have formal nights, where you can dress up in black tie attire, they are less frequent than on the other P&O Cruises ships. Britannia and the other ships in the fleet have twice as many formal nights than you’ll have when you cruise on Iona.

The table below shows how many formal nights you can expect during your cruise:

Formal nightsIonaBritannia
2- to 4-night cruisesn/a1
5- to 7-night cruises12
8- to 10-night cruisesn/a3
11- to 14-night cruises24
Formal night on Iona
Formal night on Iona

5. Britannia has No Sea View Cabins

A cabin with a window can be a good, cheaper alternative to a balcony cabin, whilst giving a nice view of the outside that you can’t get with an inside cabin. Yet, rather unusually, outside cabins (also known as sea view) don’t exist on P&O Britannia.

Suggested read: Guide to cabins on Britannia

Suggested read: Guide to cabins on Iona

Iona’s sea view cabins are a great choice, because not only do they offer great value for money, they’re also larger than both standard inside and standard balcony cabins.

OceanView cabin on Iona
OceanView cabin on Iona

Another cabin type that you’ll find only on Iona is the conservatory mini suite. These are akin to a larger balcony room, with an extra conservatory-style space that’s ideal for admiring the views while staying out of the cold and wind.

Conservatory mini suite on Iona
Conservatory mini suite on Iona

6. Iona has More Dining Venues than Britannia

Iona has 14 restaurants and 19 bars and cafes. This is more than Britannia, which has 11 restaurants and 15 bars and cafes.

Both cruise ships offer plenty of dining options that are included in the price of your cruise, so there’s no need to spend any more money if you don’t want to. However, both ships have plenty of alternative restaurants which are available for an extra charge for a special treat.

The table below shows the dining options on Iona and Britannia:

Beach HouseRelaxedCover charge – from £7.50Cover charge – from £7.50
EpicureanFine DiningCover charge – from £28Cover charge – from £28
Eric Lanlard’sAfternoon TeaCover charge – from £17.50Cover charge – from £17.50
Glass HouseWine pairingsA La Carte – mains from £8A La Carte – mains from £8
Grab and GoSnacksIncludedIncluded
Keel and CowGastro pubA La Carte – mains from £5.50n/a
Limelight ClubLive musicCover charge – from £25Cover charge – from £25
Main Dining RoomsFormal diningIncludedIncluded
Market CafeCoffee and cakesn/aCakes from £2.95
Olive GroveMediterraneanIncludedn/a
QuaysStreet foodIncludedn/a
SindhuIndianA La Carte – mains from £9Cover charge – from £20
Taste 260Pizza and burgersIncludedn/a
Vistas Cafe BarCoffee and cakesCakes from £2.95n/a

On Iona, you’ll find The Quays – a vibrant food hall offering street food from all over the world. Here, you can dine indoors, outside or take food away with you. Within The Quays, there are three restaurants:

  • Hook, Line and Vinegar – A posh fish and chip shop which serves scampi, crab and other fancy seafood delights
  • The Boardwalk Diner – Serving American BBQ hot dogs, burgers and Southern soul food
  • Fusion – Offering a variety of Asian-inspired street food

Read more: P&O Iona restaurants and bars

7. Britannia Has No Promenade Deck

If you love a promenade deck where you can walk all the way around the edge of the ship, then you may be disappointed by Britannia. This ship has no prom deck, although there is a walking track up on Deck 18.

In contrast, Iona has a spectacular wraparound promenade deck on Deck 8. As well as lots of space to walk full laps of the ship, Iona’s promenade deck features six infinity whirlpools, two large whirlpools with aft views, an al fresco dining area and the Sunset Bar.

Britannia cruise
View from the walking track on Britannia

8. Iona is More Environmentally Friendly than Britannia

Iona is one of the world’s first LNG-powered cruise ships. LNG is liquefied natural gas which is a much cleaner fuel than diesel, which powers cruise ships like Britannia.

LNG engines produce up to 30% less carbon dioxide than diesel equivalents. Using LNG also dramatically cuts nitrogen oxide emissions and almost eliminates sulphur oxide pollution.

9. Iona has Way More Hot Tubs than Britannia

Speaking of whirlpools, if you’ve cruised on Britannia you’ll know that there are only two hot tubs for public use, with another two in The Retreat which is a part of the spa that you have to pay extra to enter.

Clearly, two Jacuzzis just isn’t enough for over 3,000 people, but luckily, Iona has a total of 18 whirlpool spas (6 infinity and 12 regular) which should be more than enough for everyone on board.

Britannia hot tub
One of the two hot tubs on Britannia

10. Swimming Nappies Are Allowed on Britannia But Not Iona

Those cruising with babies or toddlers should know that on Iona, children in swimming nappies are not permitted to use the swimming pools. However, there is a small baby pool within the kids’ Splash Zone which is okay to use.

On Britannia, kids in swimming nappies can use the Lido pool and there is also a splash area next to The Reef Adventure Zone.

Iona has four swimming pools:

  • Beachcomber pool pool: Outdoor pool on the Panorama Deck
  • Panorama pool: Outdoor pool on the Panorama Deck, aft
  • SkyDome pool: Indoor pool on the Lido Deck
  • Infinity pool: Outdoor pool on the Lido Dec, aft

Britannia has four swimming pools:

  • Riviera pool – Outdoor pool on the Lido Deck
  • Lido pool – Outdoor pool on the Lido Deck
  • Serenity pool – Outdoor pool on the Sun Deck (ADULTS ONLY)
  • Terrace pool – Outdoor pool on the Sun Deck

The swimming pools on Britannia are very deep – 165cm at the shallow end and 225cm at the deep end. This means that you will be unable to stand up in the pools, even in the shallow end, unless you are over 6 feet tall. The exception to this is the Terrace Pool which is small and not so deep.

On Iona, the pools are 130cm deep at the shallow end and 140cm deep at the deep end, meaning that most people will be able to stand up. The water level is lowered further when the ship is at sea.

Suggested read: 10 essential tips for cruising with a baby or toddler on P&O Cruises

Britannia pool for babies and toddlers
Wearing a swimming nappy in the pool on Britannia

11. Iona has Unique Entertainment

Iona offers a huge choice of entertainment that you won’t find on Britannia, including aerial performances, live DJs and a silent disco. Rather than being limited to the theatre and bars on Iona, you’ll also be entertained in the SkyDome and the Grand Atrium.

Whilst both ships have lots of entertainment options and you’ll never be bored, cruisers in their 20s and 30s will likely prefer the variety of entertainment on offer on Iona.

Iona Vs Britannia – Which is Best?

If you were struggling to decide between booking a cruise on Britannia or Iona, I hope that this post has helped you to make your decision.

Both Britannia and Iona are incredible ships and which one is the best depends very much on your individual circumstances. I can’t speak highly enough of my cruise on Britannia. I’ve booked to sail on Iona several times and am looking forward to experiencing the ship for myself as soon as possible.


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Cruise Mummy

Jenni Fielding is the founder of Cruise Mummy. She has worked in the cruise industry since 2015 and has taken over 30 cruises. Now, she helps over 1 million people per month to plan their perfect cruise holidays.

Read more about me

25 thoughts on “11 Key Differences Between P&O Ships Iona & Britannia”

  1. Only 2 included in fare whirlpools on Brittania. 2 more in paid area Retreat and 2 in a crew area; so your number of 6 is correct but misleading, 4 Oct 2023

  2. Karaoke is offered adults only in The Limelight Club (not Brodies)

  3. Snap! We are booked on the same cruise. We have been on most P&O ships, including Britannia twice so it will be interesting to compare.
    Graham and Deana Morgan

    • Amazing! See you on board 🙂

  4. Hi , does the Britannia have guest speakers like Iona ? we really enjoyed them on Iona.
    it was Phil campion ex sas service man, you could not move in the area when Phil was on ,He had to do 2 a day, I personally felt they should of opened up the big theatre for his talks.

    we cruised with Iona in November around the med from Southampton, love the ship.
    we are also going in feb to the Caribbean on Britannia , hope this is just as good on fly cruise from Barbados

    • Yes, Britannia has guest speakers in The Studio. Enjoy your cruise! Jenni

  5. P & O Iona.
    Can anyone help me, is there a Free Sauna on Iona or do you have to pay for the spa ?

    • Hi Steven. The only sauna on Iona is in the spa. Jenni

  6. Great information many thanks as trying to talk to P&O on the phone is impossible.
    Do have a couple of questions I hope you could answer please, are the four person inside cabins on Iona the same as Britannia? do P&O provide a travel cot if required.

    • You’re welcome! Yes, I believe the cabins are very similar. I’ve stayed in a four person inside cabin on Britannia and have the same booked on Iona, although we haven’t been yet, they look very similar. And yes, they will give you a travel cot, but be sure to ask at least a couple of weeks before so that you can be sure it will be there for you. You’ll need to provide the cot bedding. Jenni

  7. Thank you – just what I needed to know. So glad less formal nights for me!

  8. Very helpful but will now have to check protocols for solo passenger dining which hadn’t considered.

  9. Thank you cruise mummy for the very helpful information, I’ve booked on the Iona at Christmas with my sister in law as we have both just lost our hubbies,it will be our first time without them and was a bit worried but I’m quite excited now you’ve explained a lot of things,thank you

    • You’re welcome. Have a great cruise!

  10. While Iona has a promenade (deck 8) it is important to note that balconies and similar on deck 8 face onto the promenade. If you lean on what would normally be the rail looking out to sea, you are face to face with people on the promenade deck. Equally they can see straight into your cabin, so your privacy is very limited.

  11. Thanks for your in depth comparison between Iona & Britannia. Having enjoyed cruising on Britannia, with your information Iona now sounds more appealing to me.
    Whilst always dressing appropriately for Dinner, I personally am uncomfortable with the formal nights and also prefer flexibility of Freedom dining.

    Very helpful, thank you.

  12. Thank you for this in depth information. We have three cruises booked on Iona for this year so did as much research as we could. Only disappointment from your information is the lack of P&O’s usual amount of black tie nights. We love dressing up for these events. We also prefer Club Dining but knew about the system on Iona and are happy to try it.

  13. Are there laid back adult only music/ karaoke nights on IONA ? For a 14 night cruise this October 2021 ?

    • Hi Peter. The 710 Club on Iona is adults only and has all kinds of live music. You’ll find karaoke in Brodies pub. Jenni

  14. Fantastic report, well presented and thoroughly useful.
    Please keep up the good work!
    Joe and Shirley

    • Thank you! 🙂

    • Thanks for the information can’t wait to read what you think of Iona when you get on her

  15. Helpful and insightful. Thanks! 🙂

  16. Thank you for your views, they are very helpful. Really thinking about booking a cruise on the Ionia. Only downside I can see for me is less formal nights, I love the formal nights.

  17. That was very helpful thanks

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