Banyan Tree Spa Bangkok
Day SpaBangkok
Hotel day spa in Sathon with four signature treatments, couples rooms, and daily walk-in access from 10am to 8pm.
$$$
Spas with walk-ins welcome in Thailand
3 spas match
Pai, Mae Hong Son
A walk-in herbal sauna and cold-plunge spot in Pai with a restaurant and lounge attached, open daily 8am-10pm.
Rak Ranong Onzen Spa & Cafe
Thermal BathsRanong
A budget thermal-bath spot in Ranong with a soaking pool and an on-site café, open daily 9am to 10pm, walk-ins welcome.
$