Yunomori Onsen & Spa Sukhumvit Soi 26
120, PH98+VP6, 5 Sukhumvit 26, Khlong Tan, Khlong Toei, Bangkok 10110
Worth the visit for the onsen experience alone: the Signature Bath uses Magnesium Sulfate blended with essential oil, while the Garden Bath offers open-air soaking and the individual teak wood tubs provide a private, intimate setting. Pair an onsen session with a Thai massage or aromatherapy treatment for the fullest combination of Japanese thermal bathing and traditional Thai therapeutic technique.
You step into a facility where Japanese onsen bathing tradition and Thai massage practice are deliberately combined under one roof. Yunomori Onsen and Spa on Sukhumvit Soi 26, inside the A-Square complex, is one of a small number of venues in Bangkok using real mineral spring water transported directly from the thermal springs of Wat Wangkanai in Kanchanaburi, a source that has drawn visitors for its healing properties for nearly two decades.
The onsen area offers seven distinct bath experiences. The Signature Bath is infused with Magnesium Sulfate and a proprietary essential oil blend. The Onsen Mineral Water Bath holds the Kanchanaburi spring water itself. The Jet Bath uses pressurized water streams to relieve muscle tension and stimulate circulation. The Garden Bath is set in an open-air Japanese garden for outdoor soaking. Individual teak wood tubs in the Teak Bath section provide a private and aromatic personal retreat. The Cold Bath, maintained at 17 to 19°C, closes pores and invigorates the nervous system as a contrast bath after the hot pools. A Steam Room at 100% humidity and a dry heat Sauna reaching 80 to 95°C complete the thermal circuit.
The spa treatment menu runs alongside the onsen offering. Thai Massage is delivered using body rocking, rhythmic acupressure, and assisted deep stretching. Aromatherapy Massage uses essential oils to address muscle and tendon recovery alongside stress relief. Deep Tissue Massage, Office Syndrome Treatment, Body Scrub, Herbal Compress, Radiantly Beautiful Skin facial, and Face Contouring Massage extend the range for different guest needs. Packages combining an onsen day pass with massage treatments are available at bundled pricing.
On site, Happy Rice cafe provides Japanese, Thai, and Western dishes in a contemporary Japanese home setting. A Beauty Clinic is also part of the Sukhumvit complex. Onsen day passes are priced at 650 THB for adults, and annual or six-month unlimited onsen passes are available for regular visitors.
Yunomori holds a 4.4-star rating from over 3,800 Google reviews at this location.