Heiwajima Onsen: A Real Natural Hot Spring Near Haneda Airport

I went to Heiwajima Onsen yesterday — it's close to home, so it's less a special trip and more just something I do after work sometimes. I'm also a certified Onsen Sommelier, mostly because I just really like onsen and wanted to know more about them — and this is one I've been wanting to share. Even after going a bunch of times, I still can't get over how good the water actually is: a real natural hot spring, pulled from 2,000 metres underground, not some heated pool dressed up to look like one.

The Baths

Heiwajima pulls its water from 2,000 metres underground — about 150 tonnes a day. It's a sodium chloride spring, pH 7.6, the type that leaves a thin film on your skin and makes it feel silky after. Not just something written on a sign — you can actually feel it.

My favourite is the high-concentration nano carbonated bath. Something about those tiny bubbles just melts the tension out of your legs — I'd played football a few days before and was still sore, and this one bath basically sorted it out. There's also the "utatane-yu," a reclining bath built for lying back in, and yeah, I nearly fell asleep in it. Would recommend, just maybe not right before you need to be somewhere.

Restaurant Yurari

Restaurant Yurari has a surprisingly big menu for a bathhouse restaurant — noodles, rice bowls, set meals, all of it. I had the chicken nanban, one of their recommended dishes, and it was a good call.

Then the Lounge, Which Might Be the Best Part

Honestly this might be my favourite part of the whole place. After the bath you just lie down, put the TV on, grab a manga off the shelf — I ended up a few volumes deep and completely lost track of time.

Apparently there's a real reason it feels this good, not just "I'm tired." Something about a warm bath switching your body into rest-and-recover mode, and if you actually sit still afterwards instead of rushing back out, that effect keeps going a bit longer — better circulation, less muscle tension. I didn't know any of that going in, I just know the lounge is always where I end up staying way longer than planned.

If you want the nicer version, there's a Premium Lounge for an extra ¥500 (18:00–9:00, or weekends and holidays 11:00–17:00) — a bit more space, same idea.

Handy If You're Flying Out of Haneda

If you want to squeeze in one last onsen before flying home, this is where Heiwajima is genuinely useful. There's a late-night stay course, plus a free shuttle bus to and from Haneda built around flight times — one option for an early departure, another for a late-night arrival. Beats sitting around a terminal by a mile. Details here: Heiwajima Onsen's official site.

Quick Tips

• No tattoos allowed, including stickers and paint-on ones — no exceptions.
• The late-night stay course and airport shuttle plans are worth booking ahead if you're timing them around a flight.
• Towel and house clothes are included in the standard plan — no need to bring your own.