Spas with reservation required in United States

Elkridge, Maryland

A halotherapy day spa in West Elkridge, near Baltimore, built around a salt cave, massage rooms and a yoga studio, aimed at solo adult visitors.

Palm Springs, California

Downtown Palm Springs day spa built around a natural hot mineral spring, with private mineral baths, sauna, steam room and massage.

Sonoma, California

Hotel spa at The Lodge at Sonoma with an outdoor terrace, soaking pool, plunge pool and barrel sauna, open daily 9am-5pm, adults-only, reservation required.

Napa Valley, California

A single-treatment float spa in Napa offering sensory-deprivation float pods with Epsom salt water, plus dedicated parking and walk-in access.

San Diego, California

A Korean-style day spa on Convoy Street in Kearny Mesa offering sauna access, body scrubs and massage, open daily 8:30am to 9pm.

Los Angeles, California

Day spa in a Montebello strip mall plaza offering facials, massages and body treatments, open daily with walk-ins accepted.

Los Angeles, California

A boutique medical spa in Pico-Robertson focused entirely on facials, from HydraFacial to microdermabrasion, with no body treatments on the menu.

New York City, New York

A no-frills medical spa in Manhattan built around lymphatic drainage therapy and acupuncture, open daily 10am to 9:30pm.

Carmel, Indiana

A no-frills contrast therapy studio in Carmel, Indiana, built around a 30-minute sauna-and-cold-plunge circuit for solo visitors.

Chicago, Illinois

A medical spa in Chicago's Lincoln Park offering Botox, dermal fillers, laser hair removal, IPL and semaglutide weight-loss treatment, priced in the moderate

Milwaukee, Wisconsin

East Town Spa in Milwaukee's Juneau Town combines a full-service salon and med spa with a thermal circuit of sauna, steam, pools and cold plunge.

San Diego, California

A massage-focused day spa in San Diego's Gaslamp District offering Swedish, deep tissue and hot stone sessions daily from 10am to 11:30pm.

Colorado Springs, Colorado

An adults-only medical day spa in Colorado Springs offering constitutional hydrotherapy, infrared sauna and homeopathy by appointment.

San Francisco, California

Adults-only day spa on Market Street in Mission Dolores offering massages and facials by appointment, open daily except Tuesday.

Santa Barbara, California

A medical spa on State Street in Santa Barbara offering Botox, fillers, laser hair removal and HydraFacials under physician oversight.

San Diego, California

A Clairemont wellness studio in San Diego pairing acupuncture and bodywork with an infrared sauna and a Himalayan salt room for classes.

New York City, New York

Adults-only day spa in Maplewood, NJ, offering deep tissue massage, bodywork and facials by appointment, open daily 9am-8pm.

Scottsdale, Arizona

Medical spa in South Scottsdale offering skin and wellness treatments, led by a board-certified plastic surgeon, open weekdays and Saturday mornings.

Napa Valley, California

Adults-only day spa in Napa offering facials, massage, waxing and makeup services by appointment, open daily 9am to 7pm.

San Francisco, California

A moderate-priced day spa in San Francisco's Mid-Market/SoMa area, open daily with walk-in visits possible but reservations encouraged.

Napa Valley, California

A medical spa in downtown Napa offering Botox, fillers, weight-loss injections, laser treatments and facials, open Thursday through Saturday by appointment.

Scottsdale, Arizona

Medical spa in Old Town Scottsdale offering injectables, laser treatments, facials and lymphatic drainage massage, by appointment only.

Transylvania County, North Carolina

All-inclusive multi-night wellness retreat in Pisgah Forest, NC, combining fitness classes, spa treatments, guided hikes and farm-to-table meals in private

Sonoma, California

Medical spa in Sonoma, CA offering Botox, dermal fillers, microneedling and chemical peels by appointment, run by RN Tiffany Nunez.