Let's Relax Onsen and Spa (Thonglor)
Let's Relax is the chain that made spa-standard massage a walk-in habit in Thailand, and the Thonglor flagship is the branch worth crossing town for — the only one built around a proper Japanese onsen, so a session here is soak first, massage second, and the combination beats either alone.
Plan your visit
- Hours
- Daily 10:00–00:00
Learn Wat Pho First
Wat Pho in Bangkok is the birthplace of traditional Thai massage education. Their on-site massage pavilion offers excellent treatments from students and graduates at reasonable prices — and you know the technique is authentic.
Details
- Phone
- 02 042 8045
Full opening hours
Book ahead in Bangkok
Bookable experiences in Bangkok that pair with a visit here.
Why go, and how to do it well
Let's Relax is the chain that made spa-standard massage a walk-in habit in Thailand, and the Thonglor flagship is the branch worth crossing town for — the only one built around a proper Japanese onsen, so a session here is soak first, massage second, and the combination beats either alone. What you're buying from the brand is consistency, with trained therapists, spotless rooms, and a menu that runs from a quick foot massage to two-hour packages with herbal compresses, all at prices well under hotel-spa level. It's bigger and busier than the neighborhood shops on this list — that's the trade for never having a bad session. Book ahead in the evening, and keep the small tradition of the mango sticky rice after your treatment.
Written by Mac Kiley · Updated Oct 2026
Stay within reach of Let's Relax Onsen and Spa (Thonglor)
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Book ahead in Bangkok
Bookable experiences in Bangkok that pair with a visit here.
Around here, on foot
Well-rated places within a short walk of Let's Relax Onsen and Spa (Thonglor), nearest first. Minutes are at an easy pace in the heat.
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- 4 minR-HAANRestaurants & Food · 300 m · 4.3★
- 5 minMUIN Bangkok ClubNightlife & Bars · 390 m · 4.6★
Experience hints
Pair your visit. After Let's Relax Onsen and Spa (Thonglor), round out your day in Bangkok with contrasting stops nearby.
300 Soi Thong Lo, Khwaeng Khlong Tan Nuea, Watthana
Open in Google MapsMore wellness & spas nearby
All within 1.3 km away of Let's Relax Onsen and Spa (Thonglor).
Kashikiri Onsen and Spa Sukhumvit 49
A Japanese-style onsen and spa in central Bangkok offering private and public hot spring bathing.
White Wood Green Spa & Wellness
A serene spa retreat in Ekkamai offering signature massages and water therapy in a beautifully designed wooden interior.
Rasayana Retreat
A holistic wellness retreat in Sukhumvit offering lymphatic drainage, colonics, and raw vegetarian dining in a tranquil garden setting.
Herbal Ground Spa
A highly regarded herbal spa on Sukhumvit Soi 39 offering traditional Thai treatments in a calm, beautifully designed setting.
Tips for Visiting Wellness & Spas
Communicate Pressure Preferences
Thai massage can be intense. Say 'bao bao' for lighter pressure or 'nак nак' for harder. A good therapist will check in, but don't hesitate to speak up — suffering in silence defeats the purpose.
Book Longer Sessions
A 60-minute massage is fine, but 90 or 120 minutes allows the therapist to work thoroughly. The price difference is often only 200–400 THB for an extra hour — worth it for a deeper, more relaxing experience.
Try a Herbal Compress
Add a herbal compress (luk pra kob) to your massage — steamed bundles of lemongrass, turmeric, and camphor pressed into sore muscles. It's deeply therapeutic and uniquely Thai. Usually just 200–300 THB extra.
Let's Relax Onsen and Spa (Thonglor): Frequently Asked Questions
Is Let's Relax Onsen and Spa (Thonglor) worth visiting?
Let's Relax Onsen and Spa (Thonglor) holds a 4.5★ rating from 2,117 Google reviews, placing it among the highest-rated wellness & spas in Bangkok.
What are the opening hours of Let's Relax Onsen and Spa (Thonglor)?
Let's Relax Onsen and Spa (Thonglor) is typically open 10:00-00:00 — see the full day-by-day schedule in the location info on this page. Hours can change on Thai public holidays, so check ahead for holiday visits.
When is the best time to visit Let's Relax Onsen and Spa (Thonglor)?
The best months to visit Bangkok are November – February, with the most reliable weather. Crowds peak in December & January — going early in the day usually means fewer people. Months to think twice about: April – May (peak heat).
Where is Let's Relax Onsen and Spa (Thonglor) located?
Let's Relax Onsen and Spa (Thonglor) is at 300 Soi Thong Lo, Khwaeng Khlong Tan Nuea, Watthana, in Bangkok. Getting around Bangkok: BTS Skytrain (most central areas); MRT Metro (underground).
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