ONDA vs Thermage: Benefits, Costs & Treatment Differences
ONDA and Thermage are both heat-based, non-surgical treatments, and both are popular with visitors to Busan who want firmer skin without taking time off. Because they sound similar on a price list, people often assume they do the same job. In fact they heat different layers for different reasons, and choosing the wrong one is the most common way to be disappointed.
Quick answer: ONDA uses microwave energy that concentrates in the fat layer, so it is mainly for slimming a full lower face or double chin while firming the skin. Thermage FLX uses monopolar radiofrequency to heat the deep dermis, so it is mainly for crepey, loose-feeling skin and overall firmness. ONDA is usually cheaper per session but often done as a monthly series; Thermage FLX costs more but is typically a single session repeated every 6–12 months. If your concern is fullness, look at ONDA; if it is skin quality and laxity, look at Thermage.
How they work
ONDA
ONDA, made by the Italian company DEKA, uses microwave energy designed to pass through the cooled skin surface and heat the fat layer and connective tissue beneath. That heat can reduce fat volume over several weeks and trigger collagen renewal, so the area looks firmer and more defined. It is used on the lower face, jawline and under the chin, and on body areas such as the upper arms.
Thermage FLX
Thermage FLX is the latest generation of the Thermage system from Solta Medical in the USA. It delivers monopolar RF energy that heats the deep dermis evenly while the tip cools the surface and vibrates for comfort. Collagen fibres contract straight away, and remodelling continues over the next 2–6 months, gradually tightening and smoothing the skin. It is used on the full face, jawline, neck and eye area.
Key differences at a glance
- Energy: ONDA uses microwaves; Thermage FLX uses radiofrequency.
- Main target: ONDA works mostly in the fat layer; Thermage FLX works in the deep dermis.
- Best for: ONDA for fullness, a soft jawline and double chin; Thermage FLX for crepey texture, fine lines and general firmness.
- Dose: ONDA is planned by total energy in joules; Thermage FLX is counted in shots, typically 600 or 900.
- Session pattern: ONDA is often monthly; Thermage FLX is usually once, repeated every 6–12 months.
- Eye area: Thermage FLX can be adapted for the thinner skin around the eyes; ONDA is not used there.
Benefits of each
Why people choose ONDA
- Works on fat and skin firmness in one treatment.
- Cooling protects the surface, so it is generally comfortable.
- Lower cost per session, and a trial on a small area is possible.
- Can treat body areas as well as the face.
Why people choose Thermage FLX
- Even, deep dermal heating for firmness and smoother texture.
- Suitable for delicate areas such as the eyes and neck, with adjusted settings.
- One session gives a gradual result that builds for months.
- Combines well with focused ultrasound such as Ultherapy for deeper sagging.
Who should choose which
- Round, full lower face with a little laxity: ONDA is usually the more logical choice.
- Slim face with thin, loosening or crepey skin: Thermage FLX. Removing fat from an already slim face can make it look tired.
- Deeper sagging of cheeks and jowls: neither alone may be enough; focused ultrasound such as Ultherapy reaches the SMAS layer.
- Wide jaw from muscle: jaw Botox is generally more effective than either device.
Both are generally avoided if you have a pacemaker or other implanted electronic device, metal implants in the treatment area, or are pregnant.
Cost in Busan
Example prices at a clinic in Seomyeon:
- ONDA 60,000 J : from KRW 390,000
- ONDA 100,000 J : from KRW 490,000
- Thermage FLX 600 shots + full-face skin Botox : from KRW 1,890,000
- Thermage FLX 900 shots + full-face skin Botox : from KRW 2,590,000 (this package can be shared by two people)
Prices checked October 2026. They exclude 10% VAT, and prices change frequently, so confirm today's price when booking. A useful way to compare is cost per year: three or four ONDA sessions can add up, while one Thermage FLX session may last 6–12 months. Ask what you would realistically need for your face.
On the day
- Consultation: the doctor pinches and examines the area to judge fat thickness, skin laxity and texture.
- Numbing: numbing cream for about 30 minutes. For Thermage FLX, a temporary grid is marked to guide even treatment.
- Treatment: about 30–60 minutes for either. ONDA feels like a gliding, deep warmth with brief hot spots; Thermage FLX brings short bursts of deep heat with each pulse, eased by cooling and vibration.
- After: mild redness or warmth that settles quickly. No real downtime.
Results timeline
- ONDA: fat reduction and firming develop over weeks 2–8; typically lasts about 6–12 months, helped by a stable weight.
- Thermage FLX: slight tightening may be felt straight away, with firming building over 2–6 months; usually lasts 6–12 months.
Neither gives a surgical result. Expect a natural improvement that varies from person to person.
Side effects and aftercare
Common effects for both are redness, warmth, mild swelling and tenderness for hours to a couple of days. ONDA can rarely cause burns, blisters or small firm areas in the fat; Thermage FLX can rarely cause burns, blisters, temporary surface irregularities or small areas of fat loss. Aftercare is the same for both:
- Skip saunas, jjimjilbang, hot baths, alcohol and hard exercise on the day.
- Use sunscreen for 1–2 weeks and avoid scratching or rubbing.
- Moisturise well; flying is generally fine.
Frequently asked questions
Can ONDA and Thermage be done together?
They can be planned together when someone has both fullness and loose skin, but many people only need one. A doctor will look at whether fat or skin quality is the main issue first.
Which hurts more?
Both use numbing cream and cooling. Thermage FLX delivers distinct pulses of deep heat; ONDA is a more continuous warmth. Most people find both manageable, and energy can be adjusted.
Is Thermage worth the higher price?
For skin laxity and crepey texture, many people find one Thermage FLX session a year good value. For a full lower face, the extra cost does not help if fat is the real problem, and ONDA is the more targeted option.
Deciding between ONDA and Thermage?
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This article is for general information and does not replace a medical consultation. Suitability, results, recovery and side effects vary from person to person.
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