Shinkansen Line Guide · Hokkaido Shinkansen
Hokkaido Shinkansen Guide: Under the Sea to Hokkaido —
Tokyo to Hakodate Through the Seikan Tunnel
4 Stations · World’s Longest Undersea Rail Tunnel · Hakodate in Under 4 Hours · Sapporo Extension Coming
🚄 Tokyo → Shin-Hakodate-Hokuto in as little as 3 hr 57 min
🌊 53.85 km Seikan Tunnel — 100 m below the seabed
🦑 Gateway to Hakodate, Onuma and southern Hokkaido
🎫 Fully covered by the Japan Rail Pass
What Is the Hokkaido Shinkansen?
The Hokkaido Shinkansen is Japan’s newest full shinkansen line and its most dramatic: the only bullet train that travels under the sea. Opened in March 2016, it extends the Tohoku Shinkansen north from Shin-Aomori, crosses the Tsugaru Strait through the 53.85 km Seikan Tunnel, and surfaces on Hokkaido soil to terminate at Shin-Hakodate-Hokuto — the gateway station for Hakodate.
Every train on the line is a green Hayabusa (E5 or the Hokkaido-owned H5 series, distinguishable by its lavender stripe), running through from Tokyo. All seats are reserved — there are no unreserved cars — so book a seat before boarding, either at a ticket machine, a JR ticket office, or online via Eki-net.
Sit on the left side (E seats, facing north) after Shin-Aomori. You get the last views of Mutsu Bay before the train dives beneath the strait — and the moment of surfacing in Hokkaido 25 minutes later feels like arriving in another country.
The Four Stations
From south to north, the Hokkaido Shinkansen serves four stations. Each links below to our full area-and-hotel guide.
1. Shin-Aomori (Aomori Prefecture) — the junction where the Tohoku Shinkansen ends and the Hokkaido Shinkansen begins. One local stop from Aomori city, with its Nebuta museum, fish markets and Jomon World Heritage site.
2. Okutsugaru-Imabetsu (Aomori Prefecture) — Japan’s least-used shinkansen station, on the wild Tsugaru Peninsula near Cape Tappi. A fascinating stop; almost nobody should sleep here (our guide explains why, and what to do instead).
3. Kikonai (Hokkaido) — the first station on Hokkaido soil, a small coastal town that is the jumping-off point for the samurai castle town of Matsumae and the scenic Donan Isaribi Railway to Hakodate.
4. Shin-Hakodate-Hokuto (Hokkaido) — the terminus. A dedicated shuttle train, the Hakodate Liner, reaches Hakodate Station in 15–20 minutes.
Journey Times & Fares
| Route | Fastest time | Approx. fare (reserved) |
|---|---|---|
| Tokyo → Shin-Hakodate-Hokuto | 3 hr 57 min | ~¥23,500 |
| Tokyo → Shin-Aomori | ~3 hr 00 min | ~¥17,500 |
| Sendai → Shin-Hakodate-Hokuto | ~2 hr 30 min | ~¥17,500 |
| Shin-Aomori → Shin-Hakodate-Hokuto | ~57 min | ~¥7,500 |
| Shin-Hakodate-Hokuto → Hakodate (Hakodate Liner) | 15–20 min | Included in most shinkansen tickets to “Hakodate” |
The Japan Rail Pass covers the entire line including the Hakodate Liner, as does the JR East–South Hokkaido Rail Pass — a strong-value regional pass if your trip is Tokyo–Tohoku–Hakodate rather than nationwide. Note that Hayabusa trains require a seat reservation even with a pass (free to make).
The Seikan Tunnel: The Ride’s Main Event
Roughly 20 minutes after Okutsugaru-Imabetsu, the train enters the Seikan Tunnel — at 53.85 km the world’s longest undersea rail tunnel, running up to 240 m below sea level and about 100 m beneath the seabed of the Tsugaru Strait. Because the tunnel is shared with freight trains, shinkansen slow to around 160 km/h inside. The crossing takes about 25 minutes; your ears will pop, the windows go black, and then — daylight, and the announcement that you have arrived in Hokkaido.
Which Airports Connect to This Line?
✈️ Tokyo Haneda & Narita: Most international travelers start the line from Tokyo Station or Ueno, easily reached from Haneda (~30 min) or Narita (NEX, ~55 min).
✈️ Hakodate Airport (HKD): The closest airport to the line’s northern end — about 20 minutes by bus from Hakodate Station, with frequent Haneda flights. Flying into Hakodate and riding the shinkansen south (or vice versa) makes an excellent open-jaw itinerary.
✈️ Aomori Airport (AOJ): About 35 minutes by bus from Aomori Station, one local stop from Shin-Aomori. Handy for starting a Tohoku–Hokkaido route mid-way.
✈️ New Chitose Airport (CTS): Sapporo’s airport is not on this line — until the extension opens, Sapporo remains ~3.5 hours from Hakodate by limited express.
When Does It Reach Sapporo?
Construction on the extension to Sapporo (via Shin-Yakumo, Oshamambe, Kutchan/Niseko and Shin-Otaru) is under way, but repeated tunnel-construction delays mean the opening is now expected no earlier than fiscal 2038. For now, the practical reality: the Hokkaido Shinkansen is a Hakodate line, and southern Hokkaido rewards the trip on its own.
Where Should You Stay Along the Line?
For nearly everyone: sleep in Hakodate city or Aomori city, not beside the intermediate stations. Shin-Hakodate-Hokuto has one genuinely good station-front hotel if you have an early train; Shin-Aomori is one stop from Aomori’s downtown hotels; Kikonai has a pleasant small inn; Okutsugaru-Imabetsu has essentially nothing. Full picks in each station guide linked above.
