Cruise ship casinos run on maritime law, not the gaming regulations you'd find in Vegas or Atlantic City, and that changes when the casino is open, what the odds actually look like, and who can play. The casino can only operate once the ship is far enough from shore, and the payback percentages on slots in particular are worth understanding before you sit down.
When the casino is actually open
The casino can only operate in international waters — generally at least 12 nautical miles from any coastline — so it closes automatically while the ship is docked in port or sailing close to shore. On sea days, slot machines typically open around 9-10 AM and run until 2-3 AM, with some Oasis-class-style ships running slots 24/7 on sea days. Table games usually start a bit later, around 10 AM to noon, and stay open until the early morning hours.
| Day type | Casino status |
|---|---|
| Sea day | Open — slots from ~9-10 AM (sometimes 24/7), tables from ~10 AM-noon until 2-3 AM |
| Port day | Closed while docked and within roughly 12 nautical miles of shore |
Enrolling in the cruise line's player's club before your first casino visit lets the system track your play from the start and start earning comps like free drinks, onboard credit, or future cruise offers immediately. [Replace this box with your actual casino player's club affiliate link once approved.]
Example: Join a cruise line casino player's club →Table games and real odds
Cruise casinos typically offer blackjack, roulette, craps, three-card poker, and Caribbean stud, with Texas Hold'em and pai gow showing up on some sailings. Blackjack remains the best value game onboard, with a house edge of roughly 1% when played with perfect basic strategy — but check the payout table carefully: some ships pay 6:5 on blackjack instead of the standard 3:2, which is a meaningful difference in the house's favor.
| Game | Typical house edge / payback | Note |
|---|---|---|
| Slots | 80-90% payback (10-20% house edge) | Worse odds than most land-based casinos |
| Blackjack (perfect strategy, 3:2 payout) | ~1% house edge | Best value table game — confirm it's 3:2, not 6:5 |
| Roulette, craps, three-card poker | Standard casino house edges apply | Comparable to land-based versions |
Checking a blackjack table's payout rules — 3:2 versus the less favorable 6:5 — before you sit down can make a meaningful difference in your odds over a long session. [Replace this box with your actual casino strategy guide affiliate link once approved.]
Example: Learn cruise casino blackjack basics →Age limits and cash rules
Most major cruise lines set the minimum gambling age at 18, though some itineraries departing from or sailing through US waters raise it to 21. Casinos accept cash at both slots and tables — feeding a bill into a slot machine converts it to on-screen credits — and most ships place limits on how quickly you can cash out, designed to discourage using the machines as an informal ATM.
The bottom line
Cruise ship casinos only operate in international waters, which means no gambling on port days and a schedule tied to sea days. Slot odds run noticeably worse than land-based casinos, so table games — blackjack especially, if you can find a 3:2 payout table — are the better value if you plan to gamble at all. Signing up for the casino's player's club before you start playing is free and can turn ordinary play into drinks, credit, or future cruise offers.