Circle K at 10115 Sierra Ave, Fontana, CA, US is a convenience store and gas station offering a wide variety of products for people on the go. If you are looking for a great cup of coffee, a cold beverage, a Polar Pop cup or a Froster drink, or fresh food to go, we are the place to visit. We have premium quality fuels. If you need public restrooms, please stop by. Our fast and friendly team is always happy to serve you!