Ratings
Review split — 10,690 on Korean platforms, 3,470 on Google. In Korea, Google reviews come mostly from visitors and Naver/Kakao/DiningCode mostly from Koreans. See where Koreans eat or where visitors eat.
Average ★ 3.8 across 3 sources (DiningCode's 100-point score converted to 5).
Why here
Onion's Seongsu location, set inside a converted warehouse, is one of the neighborhood's defining bakery-cafes — search interest around it runs consistently high even as Seongsu's cafe scene has grown crowded with newer openings. The bread counter draws regular waits, and brand collaborations have drawn pre-opening lines.
Busy times
Tap an hour to see how likely a wait is · typical pattern from Google, not live
Order this
Know before you go
₩₩ · ₩15,000–40,000 per person
Pastries 3,000-6,000 won; coffee 5,500-7,000 won (2026)
08:00-22:00 (Sat-Sun from 09:00), last order 21:30, open daily
Expect lines
A converted-warehouse bakery-cafe that remains one of Seongsu's most consistently busy stops years after opening, with regular bread-counter waits and, during collaboration pop-ups, lines forming before opening.
Walk-in
No reservation system — walk-in only; bread sells out on busy days.
Seongsu-dong, Seongdong
성동구 아차산로9길 8, 1,2층 (성수동2가) — show this to your taxi driver
Photos
Photos provided by the restaurant
Who's featured this place
From the YouTubers, broadcasters and guides we track — most-trusted first.
Good to know
What is Onion Seongsu?
Onion Seongsu is a café and dessert restaurant in Seongsu-dong, Seoul, operating since 2019. The dish to order is Pandoro.
Do I need a reservation at Onion Seongsu?
No — Onion Seongsu is a walk-in spot, no reservation needed. No reservation system — walk-in only; bread sells out on busy days.
How long is the wait at Onion Seongsu?
At Onion Seongsu: A converted-warehouse bakery-cafe that remains one of Seongsu's most consistently busy stops years after opening, with regular bread-counter waits and, during collaboration pop-ups, lines forming before opening.
How much does Onion Seongsu cost per person?
Expect ₩15,000–40,000 per person at Onion Seongsu. Pastries 3,000-6,000 won; coffee 5,500-7,000 won (2026)
Can I order at Onion Seongsu without Korean?
We haven't confirmed whether Onion Seongsu keeps an English menu — most neighbourhood spots in Seoul don't. This page lists what to order in English, and the restaurant's Korean name is printed on it, so you can show the name at the door and order by pointing at the counter. Cards are accepted almost everywhere, and there is no tipping.
Nearby:
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Ramen
🚶 3minHaengbokhan Sikdang 행복한식당
Samgyeopsal (grilled pork belly)
🚶 4minPimfy 핌피 성수
Pasta
🚶 4minRUFRUF 러프러프 성수
Desserts
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All Cafés & Desserts spots → · All Seongdong spots → · All Seongsu spots →
Last checked ·