Gas Prices in Ontario, CA Today

Ontario sits at the geographic heart of the Inland Empire, flanked by the 10, the 15, and Ontario International Airport, and gas prices here reflect that logistics reality. The city tracks close to California's statewide average of $5.36 per gallon for regular unleaded in March 2026, and typically runs 20–35 cents below comparable LA County ZIP codes. For the millions of vehicles that pass through Ontario every day on the freeway corridors, knowing which exits to take for fuel can mean real money.

Why Ontario Is Cheaper Than LA County

The math is straightforward: Los Angeles County levies a higher combined sales tax rate on fuel than San Bernardino County. Ontario sits in San Bernardino County, and that county-level tax differential accounts for roughly 10–15 cents per gallon of the persistent price advantage over the LA basin.

The second factor is real estate cost. Ontario's commercial land is significantly cheaper than anywhere in LA County, which means independent stations, the ones that actually compete on price, can afford to operate here. The result is a more competitive local market with more independents and discount operators in the mix.

Ontario International Airport creates an interesting dynamic: travelers who drive to the airport sometimes fill up on the way in, and station operators near the 10/Airport Drive interchange price to that captive audience. That makes the airport-adjacent stations some of the least competitive in the city. Avoid them.

Where to Find Cheaper Gas in Ontario

The industrial corridors and older commercial streets consistently beat the freeway-adjacent and airport-zone pricing:

• 91761, East Ontario and the Airport area; mixed results, the airport-adjacent stations inflate the average, but secondary streets here run competitive
• 91762, Central Ontario near Euclid and 4th Street; older commercial corridor, strong independent station presence, consistently below the city average
• 91764, North Ontario near the 210 interchange; newer retail development but also higher station density near the major interchange, worth comparing

The Holt and Euclid corridors in the 91762 zip code have historically been the most price-competitive stretches in Ontario proper. The cluster of stations between Holt Boulevard and Mission Boulevard on Euclid is worth a stop.

The Airport and Freight Angle

Ontario International Airport has grown substantially in recent years as LAX overflow and a direct relief option. That growth has brought more rideshare drivers, rental car returns, and travelers into the local fuel market, all of whom tend to fill up quickly near the airport rather than seeking the best price. The stations in the 91761 zip code near the airport capture this less price-sensitive traffic and price accordingly.

But for Ontario residents and Inland Empire commuters, the freeway stops on the 10 and 15 are also overpriced. The rule in Ontario is simple: get off the freeway, drive two blocks, and you'll find a station that's 20–30 cents cheaper than the exit ramp location.

Warehouse Club Options

Costco has a major Ontario location and is one of the highest-volume fuel stations in the Inland Empire. It typically prices 35–50 cents below the Ontario street average. The Sam's Club in nearby Rancho Cucamonga also serves the northern Ontario market. Either option is worth the detour for larger fill-ups.

ARCO stations in Ontario have traditionally been among the lowest-cost branded options. With the debit card discount factored in, ARCO often beats every other branded station in the city by 20 cents or more.

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