Bangkok vs Singapore costs
Where Bangkok is actually cheaper than Singapore, and where a different device is pretending to be the same treatment.
People fly from Singapore to Bangkok because the medians are lower. On the current index they are lower for Botox, Profhilo, HIFU and pico laser. That is a real gap. It is not a reason to book the cheapest line on a Sukhumvit menu.
Where the saving is the treatment
Compare the same unit. Botox per area only compares if the brand and the units are in both quotes. Profhilo per syringe compares if both quotes are Profhilo, not a different booster. Pico per session compares if you know whether either quote is a course.
Where the saving is a different device
HIFU is the one to slow down on. Singapore clinics often quote Ultherapy or a named platform. Bangkok clinics often quote generic HIFU. The Ultherapy vs HIFU guide is the check. A 60 percent gap can be the device, not the city.
The trip
Add the flight, the hotel night you need for swelling, and a follow-up you can attend. A saving that disappears when you add one extra night was not a saving. Speak to the clinic before you fly, and get the product brand in writing.
This is general information, not a medical recommendation. A registered doctor should decide whether a treatment is suitable for you.