Denny's - Ontario

American, North American, Breakfast

Denny's in Ontario, CA, is a beloved American diner boasting an average rating of 3.6 stars. Open 24 hours a day, you can enjoy their diverse menu any time you desire. Whether you're dining with a friend or hosting a larger gathering, don't hesitate to call ahead for reservations at (909) 983-2533. Prefer to enjoy your meal at home? Denny's offers convenient ordering through Uber Eats and DoorDash. With options for everyone, including delicious vegetarian dishes, you’re sure to find something to satisfy your cravings. If you’re intrigued by their offerings but want to explore similar choices, be sure to check out Yum Yum Donuts and The Chef's Pho. If you've had the pleasure of dining at Denny's, we welcome your thoughts! Share your experience with a review!.

Last update: 06.01.2026 from: Alphonso

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★ 3.6 / 5 from 1798 reviews

Was Adele Lowe at Denny's a mag?
I’m giving this place a 4-star rating mainly because I was informed they opened at 7 am, but they actually didn’t. I called five minutes later and was told they were open, which was a bit frustrating. However, overall, I had a wonderful experience here. View all feedback.

What Alphonso Jakubowski dislikes about Denny's:
The food received a rating of 3, while the service was exceptional, a perfect 10 out of 10. However, due to the location, I don't plan on returning. My server, Mauro, was a true gentleman and is also fantastic at the Claremont location. Unfortunately, it seems like Denny's isn't paying as much attention to the quality of the food anymore. With so much competition, one would expect them to maintain a high standard of... View all feedback.

Celia 19.04.2025 - 16:48

★ ★ ★ ★ ★

Table service was prompt, pleasant and order was correct

Jett 19.04.2025 - 16:48

★ ★ ★ ★ ★

I love their breakfast. The grand slam is great. Friendly and great service.

Adele 19.04.2025 - 16:48

★ ★ ★ ★ ★

I’m giving this place a 4-star rating mainly because I was informed they opened at 7 am, but they actually didn’t. I called five minutes later and was told they were open, which was a bit frustrating. However, overall, I had a wonderful experience here.

Alphonso 19.04.2025 - 16:48

★ ★ ★ ★ ★

The food received a rating of 3, while the service was exceptional, a perfect 10 out of 10. However, due to the location, I don't plan on returning. My server, Mauro, was a true gentleman and is also fantastic at the Claremont location. Unfortunately, it seems like Denny's isn't paying as much attention to the quality of the food anymore. With so much competition, one would expect them to maintain a high standard of comfort food.