Luxury Onsen Hotels in Japan: Private Baths, Ryokan & Modern Retreats

The Editors Answer

Frequently asked

What is the difference between an onsen and a sento?

An onsen uses geothermally heated mineral spring water meeting the legal mineral content thresholds. A sento is a public bath using regular heated tap water. Both follow the same bathing etiquette, but onsen are sought for the therapeutic properties of the source water itself.

Can I book a private onsen?

Yes — many ryokan and luxury hotels offer kashikiri (貸切, 'rented') baths bookable by the hour, and an increasing number of suites include private in-room onsen baths fed from the same spring. The properties in this list either offer kashikiri baths or in-suite private onsen.

Are tattoos allowed in luxury onsen?

The traditional ban on tattoos in communal Japanese baths still applies at most heritage ryokan. Luxury hotels with private in-suite onsen sidestep the issue entirely; kashikiri (private) baths at the other properties listed here also remove the restriction.

When is the best time to visit an onsen?

Cold months — late October through March — are traditional onsen season, when the contrast between the cold air and the hot bath is sharpest. Hakone and Kusatsu in winter, Kyoto in late autumn, and Yufuin year-round are the safest bets.