Seoul Aquarium With Kids

Toddlers and pre-schoolers: COEX

COEX is built for short attention spans. Fourteen zones follow one another on a fixed route, most tanks sit low enough for a small child to see without being lifted, and the sequence keeps changing: Korean river fish, seahorses, a dark jellyfish room, mangroves, penguins, seals. Wonderland. Fish living in a bathtub, a shower cubicle and a toilet bowl. Reliably gets the biggest reaction of the visit.

There are touch pools with starfish and shellfish, and a mermaid show that runs in Korean and does not need translating. A reviewer in May 2026 called it "easy to explore and not too overwhelming", which is exactly the right measure for a four-year-old.

School age and up: either, and Lotte impresses more

By seven or eight, the tunnel wins. Lotte's is 85 metres long with rays and sharks overhead, and the escalator down past the main ocean tank is the moment most families photograph. Feeding sessions run around midday, with the shark feed after, worth timing the visit around.

One caution before you choose Lotte for a child who loves whales: its beluga, Bella, has been alone since 2019 and the promised 2026 move to a sanctuary has not happened. What that means. Some children ask; it is easier to have the answer ready than to improvise it at the glass.

Child and infant rules for both aquariums and both ways of buying, read on 27 August 2026. The 3-12 row is the one that costs families money in the wrong place.

The row that matters is the middle one. Two adults and one seven-year-old cost about ₩77,600 on the platform's family ticket and ₩74,000 booking direct on the aquarium's website. The same three seats at the same tanks. If your party is adults only, the platform ticket is level on price and adds a refund you keep until you scan it.

Free infant admission comes with a limit at both aquariums: one free infant per paying adult. Two parents can bring two under-threes; one parent cannot. Proof of age is required, and in practice that means the passport.

• Strollers: fine throughout both aquariums, and rentable at the COEX Mall service counter along with wheelchairs.
• Lockers: at COEX they take two ₩500 coins. Useful in winter, when a family arrives carrying four coats.
• No re-entry at either aquarium. Once you step out, the ticket is spent. Do the toilets and the snack before you scan in.
• No outside food or drink inside, including bottles. Both venues have cafés; COEX's is fairly priced by mall standards.
• No flash photography. Dark rooms plus a phone flash is the one thing staff will stop you for.
• How long: one to two hours at either. Most visitors report an hour to ninety minutes, which is about the ceiling for a small child anyway.
• Quietest: weekday mornings from opening at both. Lotte's late hours run to 22:00. An evening visit is the calmest of all, if bedtime allows.

• Buying the child ticket in the wrong place. A 3-12 child costs ₩25,000 on the COEX website and the full adult rate on the booking platform. The price table is the whole reason this page exists.
• Leaving the passports at the hotel. Free infant admission requires proof of age, and every advance ticket is checked against ID at redemption. A photo of the passport is not always accepted.
• Assuming re-entry. Families step out for a feed or a nappy change and find the ticket is spent. Neither aquarium re-admits.
• Packing snacks and drinks. Outside food and drink are prohibited inside both aquariums, bottles included.
• Arriving mid-afternoon at a weekend. The tunnels become slow queues, which is exactly when a tired four-year-old runs out of patience.
• Booking Lotte on a date that might move. That ticket has no cancellation, no refund and no date change. With children, that is the risk worth paying a little more to avoid on the COEX ticket.
• Expecting English commentary. Signage is bilingual at COEX and patchier at Lotte; the shows run in Korean. Neither needs translating to enjoy, but the narration will pass a child by.

Both aquariums sit under malls, which is more useful with children than it sounds: food courts, toilets, lifts, and somewhere warm to stop when the visit ends earlier than planned.

At COEX, the Starfield Library is free, open and genuinely striking. Two storeys of shelving in the middle of the mall. And there is a cinema on the same level. Bongeunsa Temple is across the road from Exit 7 and costs nothing to walk around.

At Jamsil, the Lotte World theme park is a separate ticket in the same complex, as is Seoul Sky in the tower above; for a family doing the aquarium plus one of those, the the attraction pass covers two choices for less than two singles. Seokchon Lake, five minutes away, is flat, pushchair-friendly and free.

At SEA LIFE COEX, photograph the feeding board at the entrance before you scan in, then walk the route in order rather than trying to skip ahead. The first zones are Korean river fish and seahorses, which small children move through quickly; the pace slows at the penguins, the seal cove and the touch pools, which is where the visit actually happens. Wonderland, where fish live in a bathtub and a toilet bowl, is usually the loudest reaction of the day. The tunnel comes late in the route, so keep something in reserve.

At Lotte World Aquarium, the order works the other way. The big tank arrives early from the escalator and the tunnel follows, so the impressive part lands while attention is fresh, and the smaller zones fill the second half.

Ninety minutes is the honest budget at either. Reviewers who timed it report an hour to ninety minutes, which happens to be about the limit for a four-year-old in a dark room.

• Passports for every traveller, including infants
• A T-money card each for the subway
• Photograph the feeding board on the way in
• Toilet stop before the gate, because there is no re-entry
• Two ₩500 coins for a locker at COEX
• A change of plan for the mall if the visit ends early

The feeding sessions are the part children talk about afterwards, and they are the part you cannot book. COEX posts the day's times at the entrance because the schedule moves with tank conditions and season; at Lotte the feeds cluster around midday with the shark feed following, which a reviewer in July 2026 recommended staying for specifically.

COEX also runs a mermaid show. It is performed in Korean and needs no translation. One visitor caught a version of The Little Mermaid, another a Christmas-themed performance, so the content changes with the season rather than repeating.

Touch pools with starfish and shellfish sit near the end of the COEX route and are the other reliable hit. Staff supervise them, and hand-washing points are provided.

What does not land with children: the signage. It is bilingual at COEX and patchier at Lotte, and either way it is written for adults. If your child wants to know what they are looking at, the aquarium's own app or a quick photo of the label to translate afterwards works better than reading it aloud in a dark corridor.

Our reading of who each aquarium suits, based on what is physically at child height and what the route demands. Ages are a guide, not a rule.

The age split matters most in the middle of the range, where the price rules bite hardest too: from three, a child pays the adult rate everywhere except COEX's own website. A family with two children in that band saves roughly ₩6,800 booking direct rather than on a platform, which is the single largest saving available anywhere on the Seoul aquarium ticket comparison.

One last practical note for anyone visiting with a baby: neither aquarium has a pram park inside, so the buggy comes with you through the whole route. Both handle that fine, and both get tight in the tunnel at peak hours, which is another argument for the first hour after opening.

Under-threes go free with a passport. From three, buy COEX child tickets on the aquarium's own website and everything else on a platform. Take small children to COEX, older ones to Lotte, and go in the first hour after opening.

The Seoul aquarium tickets compared show what each option costs today.