Is the Maizuru to Otaru crossing rough?
In winter, dependably. Maizuru to Otaru is Japan's long haul: 20 to 21 hours with Shin Nihonkai Ferry from near Kyoto to Hokkaido, running the length of the Sea of Japan. From late autumn the north-west monsoon blows across that sea's full fetch, and the route spends a night and a day in whatever it has built; summer sailings are commonly a calm cruise.
Sea of Japan · about 21 to 22 hours · Reputation among passengers: has a long-standing reputation for rough passages.
Service status, September 2026
Sails nightly. Maizuru departs 23:50 and reaches Otaru at 20:45 the next day; the return leaves Otaru at 23:30 and takes a little longer.
- Low
- Moderate
- High
- Very high
Roughness summarises typical reported conditions on this route, not a forecast for any given sailing.
A day at sea along the winter monsoon's fetch
Key facts
- The Maizuru to Otaru crossing takes about 21 to 22 hours, operated by Shin Nihonkai Ferry.
- It crosses the Sea of Japan, and passenger reports place the route in the high roughness band.
- What drives the rough days: A day at sea along the winter monsoon's fetch.
- Conditions are reported roughest in January, February, November and December.
- The calmest months are usually May, June and July.
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Why the Maizuru to Otaru crossing gets rough
The winter monsoon pours cold Siberian air across the Sea of Japan for days at a time, and this route runs parallel to the coast with open water to windward the whole way. Waves have hundreds of miles to grow before they reach the ship's beam. Shin Nihonkai's vessels are among the largest and fastest ferries in Japan, built exactly for this run, which converts a heavy winter sea into steady rolling rather than misery.
This route crosses the Sea of Japan. For the full picture of that water, every crossing on it and what drives its reputation, see is the Sea of Japan rough?
When it's worst, month by month
December to February is the monsoon's core, with November and March on its shoulders. May to August is the settled season, when the same route reads as a scenic mini-cruise.
| Roughest water in Jan | Roughest water in Feb | Roughest water in Mar | Roughest water in Apr | Roughest water in May | Roughest water in Jun | Roughest water in Jul | Roughest water in Aug | Roughest water in Sep | Roughest water in Oct | Roughest water in Nov | Roughest water in Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Roughest | Roughest | Rough | Mixed | Calm | Calm | Calm | Mixed | Mixed | Rough | Roughest | Roughest |
Typical seasonal pattern, not a forecast. Any month can deliver a calm crossing or a bad one. Check the marine forecast for your sailing date. Select a month to see every sea and ferry crossing ranked for it.
Month bands: Dizzout sea-state data for the Maizuru to Otaru crossing, built from the reports and sources listed on this page. Free to cite with a link to this page.
Where to be on board
Front to back
- Bow (front)Avoid
- MidshipBest
- Stern (aft)OK
The crossing: 20 to 21 hours
Roughest stretch: The open sea, parallel to the Honshu coast
Book a midship cabin on a lower deck; with 20 hours aboard, Japanese ferry classes make the good positions affordable if you book early.
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What helps on this crossing
- Winter travellers: midship cabin, low deck, booked as early as the schedule opens.
- Use the sento-style baths early in the crossing, not mid-sea in a monsoon blow.
- Meals aboard are good and regular; keep them light when the ship is rolling.
- May to August turns this into one of Japan's great slow journeys; if the date is free, take the calm season.
- If a strong monsoon surge is forecast, expect delay or rerouting rather than a hard cancellation.
- Dizzout, a drug-free sound therapy app for passengers: it works with any headphones once nausea starts, with relief in about 90 seconds.
For the full toolkit see the seasickness guide, or what to do once it has already started. Choosing between a fast catamaran and a conventional ship elsewhere too? The physics is the same everywhere: see the catamaran guide. If the rocking follows you ashore afterwards, that is land sickness, which is normal, and it passes.
Frequently asked questions
How rough is the Maizuru to Otaru ferry in winter?
The Sea of Japan's winter monsoon builds serious seas along this route's entire length, and steady rolling for many hours is a normal December to February experience. The ships are large, fast, purpose-built long-haul ferries and keep their schedule through the ordinary run of winter; the season is simply honest about what it is.
How long is the crossing?
About 20 to 21 hours with Shin Nihonkai Ferry, overnight plus a full day at sea (or the reverse), linking Maizuru near Kyoto with Otaru near Sapporo.
When is this route calm?
May to August, reliably enough that the crossing doubles as a holiday in itself: flat seas, long days and sunset over open water. The monsoon months, roughly November to March, are the other end of the spectrum.
Should I take seasickness medicine for a 20 hour ferry?
Ask a pharmacist or doctor before the trip, mentioning the duration and the overnight leg; most motion sickness medicines are labelled for use before departure. Aboard, the structural help is a midship berth low in the ship and horizontal hours when the rolling starts.
Other ferry routes
Sources & further reading
Your next question, probably
Where on the ship should you be?
Which cabins move least, and what to do if you already booked one
Not your question? What actually works at sea?Sick right now, mid-crossing?Still rocking after you land?
Conditions described here are typical patterns drawn from published marine and operator information as of September 2026, not a forecast: any month can deliver a calm crossing or a bad one, and schedules, vessels and operators change. Route, vessel and operator names are trademarks of their respective owners; Dizzout is not affiliated with or endorsed by them. Seasickness sensitivity varies from person to person; this page is informational and not medical advice.