Recent social media posts
09/03/2026
$500 isn't the only thing I'm giving away 👀
For any students surviving on a budget, I've got you:
⚡ $1 Breakfast Jack® w/ order of a Red Bull® Can or Infusion
⚡ $1 Red Bull® w/ order of a Breakfast Croissant
⚡ Free regular-size fries (Curly or French) or dessert w/ order of a Red Bull Infusion
Offers valid 1x per week (Mon.-Sun.) for new and existing Jack Pack Rewards members. Available only in the Jack App. Dessert excludes shakes.
09/01/2026
the fortune doesn't lie 🥠 get 2 tacos for $.75, no purchase requirement, in-app only for one day only
09/01/2026
Donate $1 to No Kid Hungry at Jack in the Box and get a free small curly fry on your next visit.
08/31/2026
Get Free 2 Tacos w/ $1 minimum order
1x only on 8/31 only on the Jack App
08/28/2026
nothing better than tacos unless it's more tacos. 🌮
08/27/2026
Did you catch everything revealed today? If not, Jack delivers.
08/26/2026
The universe gave you a week-long head start. 🛸
Don't waste it.
Cosmic Cheeseburgers are only at my 1220 Centinela Ave, Inglewood, CA location through September 2. 🌌🍔
08/24/2026
Early class. Low battery. We got you. ⚡
Pair any Red Bull Can or Infusion with a Breakfast Jack for just $1 in the Jack App.
Valid 1x per week.
08/21/2026
friends = me, myself, and I
08/20/2026
What's more whimsical than my new Cosmic Cheeseburger? 🛸🪐🌟 Available for 2 weeks only at 📍1220 Centinela Ave, Inglewood, CA 90302
08/19/2026
body: resurrected
12/13/2018
Click here for great offers and stuff!
Burgers. Breakfast. Tacos and more. All of Jack’s favorite things in one place.
Address
3910 Sierra Avenue
Fontana, CA
92336
To get to the location on Sierra Avenue in Fontana, if you're commuting via public transportation, take the bus to the stop at Sierra Ave and Miller Ave. From there, walk north on Sierra Avenue for two blocks until you reach your destination.
If you're driving, take I-10 and exit at Sierra Ave. Head south on Sierra Avenue for about a mile and a half until you reach the address. There is parking available in the lot adjacent to the restaurant.
Opening Hours
| Monday |
12am - 12am |
| Tuesday |
12am - 1:30am |
|
4am - 1:30am |
| Wednesday |
4am - 1:30am |
| Thursday |
4am - 12am |
| Friday |
12am - 12am |
| Saturday |
12am - 12am |
| Sunday |
12am - 12am |
Alerts
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What people say
Fast food restaurants are a go-to for those who want quick and satisfying meals. Jack in the Box, located on Sierra Avenue in Fontana, is one such restaurant that offers a wide range of delicious options. From burgers to tacos to egg rolls, Jack in the Box has something for everyone.
Customers have taken to social media to express their love for this fast food joint. One customer couldn't decide what to get, so they got it all! Another customer uses the same jar to buy more Jack in the Box. The restaurant's dessert options are also a hit with customers debating whether to have dessert for breakfast or breakfast for dessert.
Jack in the Box also offers great deals and promotions. For instance, customers can celebrate their birthdays with two free tacos with a $1 purchase on the app or online. Additionally, customers can enjoy 2 tacos for just $0.99 when they order on the app or online.
The Pineapple Express family is another popular item at Jack in the Box. Customers can choose from a Shake, Red Bull Infusion, and Chicken Sandwich - all infused with pineapple flavor. The large Pineapple Express Shake was available for just $4.20 through an app or online order on 4/20.
Overall, Jack in the Box is a great fast food restaurant that offers tasty food and exciting promotions that keep customers coming back for more.
