Bangkok's Best-Kept Secret: Yunomori Onsen Sathorn Review + How to Get 150 THB Off
I've lived in Bangkok's Sathorn district for 15 years. And I can tell you — most people walk right past one of the city's best-kept secrets. A Japanese onsen, hidden in plain sight, right in the middle of Bangkok's business district. Let me show you exactly how to get in for less.
When people think "Bangkok spa," they picture Thai massage parlors or overpriced hotel treatments. Yunomori Onsen Sathorn is neither. It's a full Japanese-style hot spring facility — 9 different baths, a rooftop lounge, and a sky view of the Mahanakhon tower — tucked away on Sathorn Soi 10, a five-minute walk from BTS Saint Louis.
"The contrast hits you immediately. You step off one of Bangkok's noisiest streets, push open a door, and suddenly everything slows down. That's the magic of Yunomori Sathorn."
Sathorn Branch vs Sukhumvit Branch — Which One Should You Go To?
Yunomori has two Bangkok locations. If you ask me, there's only one right answer.
Sukhumvit Branch (Sukhumvit Soi 26)
- Access: Deep inside the soi from BTS Phrom Phong — you'll need a taxi or motorbike taxi
- Crowds: High tourist footfall, often packed
- Condition: Older facility — shows its age in places
Sathorn Branch (Sathorn Soi 10) ⭐ BYB Pick
- Access: 5-minute walk from BTS Saint Louis (S3) — no taxi needed
- Crowds: Quieter, better water quality management
- Condition: Newer facility, modern and clean throughout
- Bonus: Rooftop Tea & Sky Lounge with Mahanakhon tower views
Already convinced? Check the price first.
Use code UEY9HU at Klook for 150 THB off
All 9 Baths Explained — What to Expect in Each One
This is where Yunomori really stands out. Most Bangkok spas give you one or two pools. Yunomori gives you nine completely different experiences. Here's my honest breakdown of each one.
1. Yunomori Signature Bath
HOTInfused with Magnesium Sulfate and Yunomori's own essential oil blend. This is the bath to start or end with — deeply relaxing, slightly fragrant, and genuinely therapeutic. Great for muscle recovery after a long travel day.
2. Mineral Water Bath
39°CWater imported directly from the thermal springs of Wat Wangkanai, Kanchanaburi. The same water that's been drawing healing-seekers for nearly two decades — now in the heart of Bangkok. Good for joint pain, circulation, and stress.
3. Sleeping Jet Bath
HOTYou lie down in this one. Eight strong air jets target the back, thighs, legs and feet simultaneously. It sounds intense — and it is, in the best way. Noticeably improves sleep quality. One of the most unique experiences in the facility.
4. Silk Bath (Micro Bubble Bath)
HOTThousands of micro-bubbles give the water a silky, almost creamy texture. Surprisingly relaxing — the gentle stimulation eases muscle tension without any pressure. Excellent for skin and particularly good for rheumatic aches.
5. Soft Bubble Bath
39°CThe ideal starting point if you're new to onsen. Comfortable temperature, gentle bubbles — it warms up the body and settles the mind before moving to hotter baths. Think of it as an introduction.
6. Cold Bath
17–19°CAfter the hot baths, this is genuinely refreshing. The cold water closes the pores, tightens the skin, and floods your body with natural energy. The contrast therapy effect is real — you'll feel it immediately.
7. Deep Cold Bath
16–17°COne degree colder than the Cold Bath — and the difference matters. Ancient ritual, modern science: alternating hot and cold causes a rush of blood and energy through the entire body. Mood-brightening, circulation-boosting, and deeply invigorating.
8. Steam Room
100% HumidityThe wet heat opens every pore and pushes toxins out. Great for skin rejuvenation, joint pain, and metabolism. Ten minutes in here feels like a full detox session.
9. Sauna Room
80–95°CDry heat at its most intense. The body sweats out deeply, muscles release, and the metabolic system gets a proper boost. End your circuit here for maximum purification.
BYB Recommended Bath Order:
Soft Bubble Bath → Signature Bath → Mineral Bath → Sleeping Jet Bath → Silk Bath → Steam Room → Cold Bath → Deep Cold Bath → Sauna
This takes roughly 2–3 hours. The all-day ticket (650 THB) means no rushing.
Practical Information — Everything You Need Before You Go
| Detail | Info |
|---|---|
| Address | Sathorn Soi 10, Silom, Bang Rak, Bangkok |
| Hours | Daily 10:00 AM – Midnight (00:00) |
| Entry Fee | 650 THB (all-day pass, adult) |
| BTS | Saint Louis Station (S3) → 5-minute walk |
| Swimwear | Not permitted in baths — towels provided |
| Gender | Fully separate (baths and changing rooms) |
| Restaurant | Japanese restaurant on-site |
| Official Website | yunomorionsen.com/sathorn-10 |
How to Pay Less Than 600 THB — Two Ways
Walking in and paying full price is the least smart way to visit. Here are the two methods I use.
Method 1 — Klook + BYB Referral Code
Book through Klook and apply my referral code at checkout for an instant 150 THB discount. First-time Klook users also receive a welcome coupon on sign-up — stack both for maximum savings.
BYB Referral Code
3 Steps:
Step 1: Click the link below → Search "Yunomori Sathorn"
Step 2: Select your date and session preference
Step 3: Enter UEY9HU in the promo/referral code field → 150 THB off instantly
Method 2 — Follow Yunomori on LINE (Even Better Deals)
This is the method most tourists completely miss. Add Yunomori's official LINE account and you'll receive exclusive app-only promotions that never appear on Klook or the website.
What I've personally received through LINE:
- 1+1 entry deal (bring a friend, one person gets in free)
- Seasonal flash discounts
- Massage package special pricing
Search "Yunomori Onsen" on LINE and add as a friend. Free to do, potentially very worth it.
The Perfect Sathorn Half-Day: My Personal Routine
Ready to Book?
A full day of the best urban onsen experience in Bangkok — and you don't have to pay full price for it. Use code UEY9HU on Klook, or wait for a LINE 1+1 deal if you're not in a rush.
Either way, your body will thank you.
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One minute's walk from Yunomori. The best way to end a Sathorn wellness day.
Read the Brunch Review →
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