Fast Food Restaurant – illustrative photo

Fast Food RestaurantFullerton, CA

Sonic – Fullerton, CA

Open now · closes 2:00 AM

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Illustrative photo

Opening hours

Open now · closes 2:00 AM

Weekly opening hours of Sonic
Monday	10:00 AM – 2:00 AM
Tuesday	10:00 AM – 2:00 AM
Wednesday	10:00 AM – 2:00 AM
Thursday	10:00 AM – 2:00 AM
Friday	10:00 AM – 2:00 AM
Saturday	10:00 AM – 2:00 AM
Sunday	10:00 AM – 2:00 AM

Local time in Fullerton: 10:07 PM (PDT). Holiday hours may differ – call (714) 223-1415 to confirm.

Location & directions

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441 North Placentia Avenue
Fullerton, CA 92831

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About Sonic

Sonic is a fast food restaurant you'll find at 441 North Placentia Avenue in Fullerton, California. It is one of 115 places to eat and drink we list in Fullerton.

Sonic is open daily, 10:00 AM – 2:00 AM.

Available service options are takeout, drive-through, and outdoor seating. On the menu: burgers.

Phone: (714) 223-1415.

Quick facts

Category: Fast Food Restaurant · Burger
Address: 441 North Placentia Avenue, Fullerton, CA 92831
Phone: (714) 223-1415
Hours: Open daily, 10:00 AM – 2:00 AM
Listing updated: September 2026 · Suggest an edit

Popular times (estimated)

6AM

9AM

12PM

3PM

6PM

9PM

Estimated from typical visit patterns for fast food restaurants and this venue’s opening hours – not live data.

Features & amenities

Service options

Takeout
Drive-through
Outdoor seating

Amenities

Restroom

Reviews

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Frequently asked questions

What are Sonic's opening hours?

Open daily, 10:00 AM – 2:00 AM. Monday: 10:00 AM – 2:00 AM; Tuesday: 10:00 AM – 2:00 AM; Wednesday: 10:00 AM – 2:00 AM; Thursday: 10:00 AM – 2:00 AM; Friday: 10:00 AM – 2:00 AM; Saturday: 10:00 AM – 2:00 AM; Sunday: 10:00 AM – 2:00 AM.

Is Sonic open on Sunday?

Yes, Sonic is open on Sundays: 10:00 AM – 2:00 AM.

Where is Sonic located?

Sonic is located at 441 North Placentia Avenue, Fullerton, CA 92831.

What is the phone number of Sonic?

You can call Sonic at (714) 223-1415.

Does Sonic offer delivery or takeout?

Delivery is not listed for Sonic, and takeout is available. Listed service options: takeout, drive-through, and outdoor seating.