Natural Hotspring Heiwajima

«Ladies’ day» on Tuesdays and Thursdays. ¥1,500 as opposed to the regular rate of ¥1,800 for 7 hours. I didn’t realize that I could’ve gotten a discount, but as I returned the loungewear and received the key for the shoe locker the man at the counter gave me ¥300. They have a discounted rate for senior citizens over 70 too. I didn’t see a free shuttle bus to and from the airport. I ended up taking a local bus to Heiwajima subway station which cost ¥280 and then took a free shuttle bus from there. On the way back to the airport, I got on the same shuttle bus then took the subway which cost ¥370 to the international terminal. It was cheaper to take the bus, but took a lot longer. If you decide to take the regular city bus back to the station, the people at the hot springs will give you a free voucher.
Lots of different types of baths. Since I went on a weekday, it was fairly empty. When you pay, they give you a small mesh bag with loungewear, two towels, and a bottle of water. You get a key for a nice sized locker so you can put your belongings inside. At the entrance to the actual bathing area, you can find disposable razors and tooth brushes. The vanity area has hair dryers, hair brushes, and lotion.
After you are done bathing, slip into your comfy loungewear and you can eat at the restaurant, get a massage, or take a nap. There is a women’s only relaxation room which is sectioned off from the co-​ed area. The lounge chair fully reclines and there is a tv for each chair. The speakers are built into the head rest so you don’t bother your neighbor. The vending machines I found only sold drinks; no snacks.
The hot springs is located on the second floor of a mega shopping complex. It’s right next to a Jonathan’s and there’s a karaōke and bowling place on the 3^rd floor. There’s a food court on the first floor, a Lotteria, and a Don Quixote.

A decent onsen to relax at. Conveniently close to the Tokyo-​Haneda Airport for those who want to relax before their flight. There’s also a free shuttle to and from the rail station. As with most places in Japan, the staff was friendly and helpful.

羽田空港からすぐの癒されるスポット、必ず朝便のファーストチェックイン！anyone wanting to have your kinks and flight swelling melted away must hang out at Heiwajima! I just finished my 90min thai massage and feeling like new and ready to take Tokyo! マッサージは最高に気持ちよかってムクムクの体は生き変えた*\(^o^)/*

This spa is awesome. It is renewed recently and it became more attractive.
This is close to the Haneda airport and there are free pick-​up buses from here. You can get to the airport within 20 minutes.
When you have to wait for flight until very late at night or very early in the morning which you are not supposed to take trains, I recommend you to kill your time here. You can enjoy comfortable spa as long as you want and there are some cheap private rooms are available. You do not need to worry about the fee of expensive taxi.
Actually staying at this spa is cheaper than taxi fee. You know taxi is extremely expensive in Japan especially midnight.
Unfortunately I guess not many people know this place. They want to book the cheap flights which leave and arrive at midnight and they have in trouble how to get there and home. I wish some airplane companies advertise this spa.
I live in Otaku and in that case my father always takes me by car and I do not need to stay here for that reason, but I just want to spend more time at the spa and am thinking to stay for a might here for relaxing.