sauna and cold plunge · Thonglor, Sukhumvit, Bangkok, Thailand
Let's Relax Onsen & Spa, Thonglor
Spa not a bathhouse: here the bath is part of another programme
A hotel-floor onsen in Thonglor whose hot bath is filled with concentrate shipped from Gero: five graded baths, sauna, steam and hot stone beds on one ticket.
The full record, with the available operating, price and research data, is free for Bathhouse subscribers.
Venue information
- Address
- Grande Centre Point Sukhumvit 55, 5F, 300 Sukhumvit Soi 55 (Thonglor), Bangkok
- Neighbourhood
- Thonglor, Sukhumvit
- City
- Bangkok, Thailand
- Status
- Open
- Access
- Day pass, Booked session
Features
- Type
- Day spaHotel spa
- Heat
- Onsen / hot springsFinnish saunaSteam room
- Cold
- Cold plunge
- Setting
- Urban
- Access
- Day passBooked session
- Social model
- Gender separated
- Amenities
- Treatments and massage
How it works
Published: baths at graded temperatures, cold bath 18 °C, whirlpool 36 °C, soda 38 °C, silk 40 °C and a Gero hot-spring bath at 42 °C using concentrate from Gero and Takayama; sauna, steam, hot stone beds and cool-down rooms; 10:00 to 21:00 on the fifth floor of the hotel.
Bathing ticket, with massage and treatments booked separately.
Frequently asked questions
Where is Let's Relax Onsen & Spa, Thonglor?
Let's Relax Onsen & Spa, Thonglor is at Grande Centre Point Sukhumvit 55, 5F, 300 Sukhumvit Soi 55 (Thonglor), Bangkok, in Bangkok, Thailand.
What does Let's Relax Onsen & Spa, Thonglor have?
The published features include onsen / hot springs, finnish sauna, steam room, cold plunge and treatments and massage.
How does access to Let's Relax Onsen & Spa, Thonglor work?
The published access models include day pass and booked session. Check the current schedule and conditions on the official site before visiting.
Is Let's Relax Onsen & Spa, Thonglor open?
The status recorded by Bathhouse is: Open. The research was updated on 2026-09-01; confirm recent changes with the operator directly.
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About this research
Desk research updated on 2026-09-01; anything the operator has not published stays open. Bathhouse separates what the operator publishes from what was measured on a visit, and leaves unverified fields empty.