Best Online Slots in Ontario — June 2025

What are the best Ontario online slot casinos in June 2025?

Let's take a look at the top slots on offer at each of the leading Ontario online casinos. These sites and titles receive plenty of positive feedback from regular casino players, so consider this a bird's eye view of the Ontario slots landscape:

Our top five best online slot picks in Ontario

With thousands of slots available to players via Ontario casino apps and online sites, it's often hard to know where to start.

Luckily for you, we've picked out our top five favourite slot games currently on the market, taking into account themes, graphics, Return To Player (RTP) percentages, and everything in between. 

Covers expert analysis

"We recommend getting stuck into these slots, figuring out what you like, and exploring more options from there."

Christian Holmes, Casino Editor

1. Cash Eruption

Cash Eruption is a title from IGT that has become one of Ontario's best online slots. It has a standard configuration of 5 reels, 3 rows, and 20 fixed paylines. With wagers ranging from $0.20 and $40 per spin, it should suit most casual bettors. It has a 96% default RTP, which puts the game in average payout territory. 

Why do people like it?

Using an Aztec temple theme and a searing sun logo, Cash Eruption combines traditional fruit symbols with icons like the Fire Goddess. Game features include expanding wilds from the Fire Goddess symbol and free spins from there or more Volcano scatter symbols. During the free spins, the central reels merge into a colossal symbol, enhancing win potential. Six or more fireballs trigger the Cash Eruption Bonus with three Respins and the possibility to win one of four jackpots. 

For most, it's an immersive experience that blends the traditional visuals of 777 slots but adds an extra layer of entertainment with how the bonus rounds play out visually. 

Compared to other slots on this list, it's nothing special, but sometimes, the most simplistic games can be adored by those who play them. 

2. Gates of Olympus

Gates of Olympus is one of Pragmatic Play’s most popular Ontario slots, and has been since its launch in 2021. The game uses a 6-reel, 5-row grid with an “All Ways” system, which allows winning combinations to form by landing eight or more matching symbols anywhere on the reels. 

The betting range is from $0.20 to $100 per spin, while the RTP of 96.5% offers a balanced engine to play for the maximum win of 5,000x.

Set against the backdrop of Mount Olympus, this ancient Greek slot has cascading reels, multiplier symbols up to 500x, and a free spins round offering 15 freebies with increasing multipliers. 

Slots with mythological themes are very popular among online casino regulars, so it's no surprise to see Gates of Olympus ranked so highly on lists like ours

3. Book of Dead

Book of Dead is the flagship game from Play’n GO and one of the most iconic ancient Egyptian slots ever made. It is a simple setup of 5 reels, 3 rows, and 10 adjustable paylines. Ideal for budget players and high rollers, you can play from $0.01 to $100 per spin. Book of Dead has an RTP of 96.21% and a maximum win of 5,000x.

You will see adventurer Rich Wilde plunder tombs with symbols including pharaohs, Anubis, and the Book itself, which serves as the wild and scatter symbol. Landing three or more of the Book symbols rewards you with 10 free spins with a random expanding symbol.

The Book of Dead slot is famous for its extreme volatility, so make sure you manage your bankroll well. 

4. Starburst

As one of the most popular online slots, Ontario players will find Starburst as most online casinos. An arcade-style space adventure, Starburst has 5 reels, 3 rows, and 10 paylines. You can spin from $0.10 to $100 on a spin, with the RTP at 96.09%. Low volatility means the game pays lesser amounts regularly, but big wins come from the Starburst Wilds. 

Appearing on reels 2, 3, and 4, Startburst Wilds can cover a whole reel and gives a re-spin. The slot also has the 'Both Ways' mechanic, which means winning combinations can land from left to right and from right to left on the reels. 

5. Age of the Gods: King of Olympus

Some of the best slots machines to play in Ontario are progressive jackpots, and Age of the Gods is an iconic series in this category. With the Age of Gods: Kings of Olympus, Playtech provides a game with a nice balance with a 95.98% RTP and medium volatility. The game has 5 reels, 3 rows, and 25 fixed lines, while bets are flexible from $0.25 to $250 per spin.

A mythical Greek theme and symbols of the Greek gods make for an immersive visual experience. AOTG: King of Olympus has a free spins round with an increasing multiplier modifier. The four progressive jackpots are Power, Extra Power, Super Power, and Ultimate Power. Winning the biggest of these starts from $100,000 but usually pays over $500,000 to winners. 

What are the best new online slots in Ontario June 2025?

With the Ontario iGaming market now so well established, software developers are constantly competing to create the next generation of iconic slots. This means Ontario casino players can expect dozens of new releases each month.

If the developers do their jobs right, these new games can provide even greater diversity and choice for players. After all, new slots should embrace modern features and graphics, and further your iGaming experience.

Not every new slot does that, but below are the new Ontario slots that we think are worth checking out:

Covers Expert Analysis

"As we've mentioned a few times before, new games are always coming out in Ontario's ever-growing iGaming market, so be sure to check back for our updated lists."

Christian Holmes, Casino Editor

Most popular slots in Ontario

Types of online slots in Ontario

Online slots in Ontario come in a range of formats to suit different players and their budgets. Below are the main games: 

What online slot wins the most?

RTP is a percentage that highlights how much a casino game pays back to players over an extended period of time. For example, a slot with a 96% RTP will, in theory, return $96 for every $100 wagered, on average. This means higher RTP games theoretically have better odds for players, as more money gets returned in the long term. 

Below is a table showing the best payout slot games in Ontario:

Best jackpot slots in Ontario

Jackpot slots usually pay less frequently, but offer larger rewards when they do hit. They are ideal for players who don’t mind a bit of risk or have the bankroll to play through lots of non-winning spins. Below are some of the best jackpot Ontario slots:

Best progressive jackpot slots in Ontario

Progressive jackpot slots are games that take a portion of each bet made by every player and put it towards a jackpot prize pool. This can happen at a single casino or, more commonly, across every version of the slot on every available casino. Jackpots can reach massive amounts, with the best progressive slots paying out millions of dollars.  

How to play online slots in Ontario

Online casinos in Ontario need to meet regulatory standards when accepting new players. That means the registration process is similar across casino sites as they adhere to Know Your Customer (KYC) principles. Below, we will provide a universal guide that you can apply to the top Ontario slots sites:

Is there a trick to win online slots?

Is there a trick to win online slots? Not necessarily. However, there are strategies slots players can utilize to ensure they limit their losses and increase their chances of potentially winning some money.

They are as follows: 

• Exploit variance

So, the number crunchers say high-volatility slots with a 96% RTP are where it's at. The 96% RTP means that for every $100 you throw in, the game will give back $96 over time. Now, high volatility means wins don't come around as often, but when they do, they're usually bigger. Even if you don't catch a big one, you'll still be in better shape than playing progressive jackpots, which have lower RTP. This combo can be a smart move because you've got a shot at landing a seriously huge win in fewer spins. 

Here are three widely offered slots we recommend trying:

• Book of The Dead by Play'n Go
• Curse of The Werewolf Megaways by Pragmatic Play
• Over The Moon by Big Time Gaming 

• Find your optimal bet size

Of course, for many readers who have been in the trenches, this advice might seem obvious. Yet, very few people actually follow it. Mainly, that's because they don't know how. If you're more aggressive, we would suggest betting around one to two percent of your bankroll per spin. However, if that's too much for your liking, you could bet one-half of a unit per spin or even a quarter. 

For example, if you have a bankroll of $500 and you bet one unit per spin, you would be betting $5. If you bet half of a unit per spin, that would be $2.50. One-quarter of a unit would be $1.25. A tenth of a unit would be $0.50.

The better you are at sizing your units, the longer you can play. 

Where is the best place to play slots online?

With so many online casinos available in the province, finding the best online slots Ontario has to offer can be time-consuming. However, the key to discovering top Ontario slots starts with selecting a top-quality online casino. All of our casino recommendations have licenses from the Alcohol and Gaming Commission of Ontario (AGCO) and its subsidiary, iGaming Ontario (iGO).

Covers Expert Analysis

"You should also look for sites that have flexible game portfolios covering as many slots as possible, including high RTP and progressive jackpot titles. Additionally, choose a casino with games from a range of top providers like NetEnt, Pragmatic Play, Games Global, and IGT. Other metrics to check include flexible and fast payments, mobile compatibility, and adequate customer support."

Christian Holmes, Casino Editor

Downloading a casino app

Playing Ontario slots on your phone offers the ultimate convenience without being tied to a single location. Most casino sites are mobile-friendly and built on HTML5 technology, meaning you can play using your mobile browser. However, Ontario casino apps offer a more responsive and smooth mobile gaming experience, with a bespoke UI for easier access to games and payments. 

Some casinos list their apps on the Apple App Store for iOS and the Google Play Store for Android. Sometimes, an Android casino app may not have an official listing. If this happens, you can use an APK from the official casino website and download it onto your Android phone or tablet. 

Best slot game providers

There are hundreds of slot software developers, but some stand out as consistently offering high-quality and exciting slots with modern features and cutting-edge visuals. 

• NetEnt – Known for visually stunning and innovative slots, NetEnt created classics like Starburst and Gonzo’s Quest.
• Pragmatic Play – Famous for fast-paced, feature-rich, and high-volatility slots, Pragmatic Play offers hits like Gates of Olympus and Sweet Bonanza.
• Playtech – A pioneer in online gaming, Playtech produces Age of the Gods slots and Buffalo Blitz. The developer is also known for its big jackpots and engaging features.
• Games Global –The first major iGaming software provider, Microgaming (Games Global), is famous for Mega Moolah, Immortal Romance, and hundreds of other slots across multiple studios. 

Requirements to play online slots in Ontario