ARA Spa at Ameristar St. Charles

1 Ameristar Blvd, St. Charles, MO

ARA is the spa inside Ameristar Casino Resort Spa St. Charles, the Boyd Gaming casino hotel on the Missouri River just off I-70, about 25 minutes west of downtown St. Louis. Its heat is a classic resort hydro circuit: a steam room, a dry sauna, a whirlpool, a Swiss shower and a warm hydro pool, with the resort's indoor-outdoor pool, its hot tubs and a fire pit a few steps away. There is no cold plunge, so the Swiss shower is the cool-down. Any massage, facial or body treatment includes the circuit, and day guests are welcome without a hotel room, so book a treatment and plan to arrive early and linger. The spa has also sold a circuit-only Splash Pass for people who just want the steam, sauna and pools; its current price is not published, so call ahead to ask. Because it sits in a casino resort, the spa and pools are 21 and over. Expect treatment prices typical of a resort spa, and reviews that rate the therapists more highly than the facilities. Hours have been listed as 9 a.m. to 8 p.m. most days and until 9 p.m. on Saturday. It is the easiest way in the western suburbs to get a steam-sauna-whirlpool afternoon under one roof, and couples often pair it with dinner at the resort.

Quick facts

Type
Resort/Hotel Spa
Heat
Traditional sauna, Steam room, Hot tub
Booking
Walk-in + Reservation
Session style
Appointment-based
Gender
Co-ed with separate areas
Clothing
Clothing required
Age policy
21+

Hours

Last updated November 2026.

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