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. What you're buying from the brand is consistency: 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 neighbourhood 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.
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Experience hints
Pair your visit. After Let's Relax Onsen and Spa (Thonglor), round out your day in Bangkok with contrasting stops nearby.
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Go at six in the morning, before the heat turns 15,000 stalls into an endurance test.
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Go at 08:30 or don't bother, the Emerald Buddha's courtyards fill up fast and stay full until closing.
The Grand Palace
Go at 08:30 sharp, cover your shoulders and legs, and give it three hours rather than one.
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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).
Location Info
300 Soi Thong Lo, Khwaeng Khlong Tan Nuea, Watthana02 042 8045letsrelaxspa.com/branches/bangkok-thonglor-onsen-and-spa/Visitor Information
Best time to visit
November – February
Avoid: April – May (peak heat)
Rainy season
May – October
Avg. temperature
25°C – 34°C(77°F – 93°F)
Crowds
Peak: December & January
Getting there
Suvarnabhumi (BKK) and Don Mueang (DMK) airports serve Bangkok with direct flights from most major cities.
Getting around
- •BTS Skytrain (most central areas)
- •MRT Metro (underground)
- •Airport Rail Link (ARL)
- •Chao Phraya Express Boat
- •Grab (ride-hailing app)
- •Metered taxis — always use the meter
Where to stay near Let's Relax Onsen and Spa (Thonglor)
Find hotels in Bangkok on the booking sites travellers trust most.
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- Filter for free cancellation
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Tips for Visiting Wellness & Spas
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.
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.
Nearby Places
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.
Similar Wellness & Spas Across Thailand
Royal Palm Spa
Ao Nang's late-opening massage spot, where regulars book therapists by name and rarely get it wrong.
Sansabai Massage 2
Serious, results-driven massage in central Phuket Town, with therapists who actually read your body.
Centara Ao Nang Beach Resort & Spa Krabi
Beachfront calm at the quiet end of Ao Nang, with the bars and shops still an easy walk away.
The One Massage - Pattaya
A proper, professional massage on Walking Street, open from mid-afternoon until half past midnight.
Where to stay near Let's Relax Onsen and Spa (Thonglor)
Find hotels in Bangkok on the booking sites travellers trust most.
- Compare prices across sites
- Filter for free cancellation
- Secure checkout on the partner site
Compare rates on Booking.com
Largest selection
Compare rates on Expedia
Bundle & save
Compare rates on Hotels.com
Member prices
We may earn a commission from bookings made through these links — at no extra cost to you. Learn more.
Location Info
Visitor Information
Best time to visit
November – February
Avoid: April – May (peak heat)
Rainy season
May – October
Avg. temperature
25°C – 34°C(77°F – 93°F)
Crowds
Peak: December & January
Getting there
Suvarnabhumi (BKK) and Don Mueang (DMK) airports serve Bangkok with direct flights from most major cities.
Getting around
- •BTS Skytrain (most central areas)
- •MRT Metro (underground)
- •Airport Rail Link (ARL)
- •Chao Phraya Express Boat
- •Grab (ride-hailing app)
- •Metered taxis — always use the meter