Ameristar St. Charles is the largest casino property in the St. Louis metro and one of the largest in the country by gaming space. It rates 4.2 from more than 14,800 Google reviewers — the best-rated casino in Missouri.
Boyd Gaming operates it, and it sits on the Missouri River in St. Charles, north-west of the city.
What's on the floor
130,000 square feet of gaming space with around 1,500 slot and video poker machines, table games and two casino VIP rooms.
That square footage is the headline figure and it is worth understanding what it buys: space rather than sheer machine count. The floor is not densely packed, which makes it markedly more comfortable to move around than most Midwest casinos — a difference regular visitors notice immediately and rarely articulate.
Check the venue's site for the current table and poker schedules before planning around either; the game spread here varies by shift more than the machine count would suggest.
Hotel, spa and dining
The hotel is a AAA Four Diamond all-suite property with 400 rooms, looking out over either the Missouri River or the historic streets of St. Charles. A Four Diamond rating is unusual for a regional casino hotel and it is the property's strongest single credential.
ARA, the spa at Ameristar, is a full operation — steam room, sauna, Swiss shower, hydro-pool, indoor and outdoor pools and a spa boutique. Between the spa and the suites, this is the St. Louis property built for a stay rather than an evening.
Dining runs to seven venues and twelve bars, which is the deepest food and beverage operation of any Missouri casino. RYSE Nightclub covers the late end.
Tips before you go
You must be 21 to gamble, the minimum age at every Missouri casino.
The casino is open 24 hours, seven days a week.
Historic St. Charles is genuinely worth walking. Main Street runs along the riverfront a short distance from the property, and it is one of the better-preserved nineteenth-century streets in the Midwest — a rare case of a casino sitting next to something worth seeing on foot.
St. Charles is about half an hour north-west of downtown St. Louis, and roughly twenty minutes from Lambert International.
Nearby alternatives
Downtown, Horseshoe St. Louis sits under the Gateway Arch with a WSOP poker room and two attached hotels. West at Maryland Heights, Hollywood Casino St. Louis has a 20-table poker room and an airport shuttle. South, River City Casino serves south St. Louis County.
For the full picture, see all Missouri in-person casinos.
FAQ
What are Ameristar St. Charles's hours?
The casino is open 24 hours a day, seven days a week. The spa, restaurants and nightclub keep their own hours.
How old do you have to be to gamble at Ameristar St. Charles?
You must be 21, the minimum age at every Missouri casino.
How big is Ameristar St. Charles?
130,000 square feet of gaming space — the largest casino property in the St. Louis metro and one of the largest floors in the country.
What games are available at Ameristar St. Charles?
Around 1,500 slot and video poker machines plus table games and two casino VIP rooms. Check the venue's site for the current table schedule.
Does Ameristar St. Charles have a hotel?
Yes — a AAA Four Diamond all-suite hotel with 400 rooms overlooking the Missouri River or historic St. Charles.
What is there to do at Ameristar St. Charles besides gambling?
The ARA spa with indoor and outdoor pools, seven restaurants, twelve bars, RYSE Nightclub, and historic Main Street St. Charles a short walk away.
Rather play from your couch tonight? See our Missouri sweepstakes rankings.
Updated August 2026 · Details verified against Missouri Gaming Commission records and the venue's official site. Hours and offerings change — confirm before you go.
