Costco Ontario Business Center Gas Prices – Ontario, CA
- Regular · today
- $5.899
- Premium · today
- $6.359
USD per gallon · Last updated September 30, 2026 · This station does not sell diesel
3680 E Guasti Rd, Ontario, CA 91761-3708 · Open in Maps ↗
30-day range
where today sits- Regular$5.899 today · avg $5.792$5.699 low$5.899 high
- Premium$6.359 today · avg $6.259$6.159 low$6.359 high
Price history at Ontario Business Center
Last 30 days · USD per gallonView data as table
| Date | Regular | Premium |
|---|---|---|
| Sep 1 | — | — |
| Sep 2 | — | — |
| Sep 3 | — | — |
| Sep 4 | — | — |
| Sep 5 | — | — |
| Sep 6 | — | — |
| Sep 7 | — | — |
| Sep 8 | — | — |
| Sep 9 | — | — |
| Sep 10 | — | — |
| Sep 11 | — | — |
| Sep 12 | — | — |
| Sep 13 | — | — |
| Sep 14 | — | — |
| Sep 15 | — | — |
| Sep 16 | — | — |
| Sep 17 | — | — |
| Sep 18 | — | — |
| Sep 19 | — | — |
| Sep 20 | $5.699 | $6.159 |
| Sep 21 | $5.699 | $6.159 |
| Sep 22 | $5.699 | $6.159 |
| Sep 23 | $5.759 | $6.199 |
| Sep 24 | $5.799 | $6.259 |
| Sep 25 | $5.799 | $6.299 |
| Sep 26 | $5.799 | $6.299 |
| Sep 27 | $5.799 | $6.299 |
| Sep 28 | $5.859 | $6.299 |
| Sep 29 | $5.899 | $6.359 |
| Sep 30 | $5.899 | $6.359 |
Last updated September 30, 2026. Prices are collected once daily and can lag same-day changes at the pump.
Today’s price in context
At $5.899 for Regular, Ontario Business Center is tied for the 15th cheapest of 128 Costco gas stations in California today, $0.143 below the California average of $6.042.
None of the 5 nearest Costco stations is cheaper today.
- vs the US average
- $1.293 above, at $4.606
- Premium over Regular
- $0.460 — the California median is $0.400
- Over the last 30 days
- up $0.200
- Days the price changed
- 4 of 11 reported days
- Cheapest day in the window
- September 22, 2026, at $5.699
- 15-gallon fill
- $88.48, $3.00 more than at the 30-day low
Ontario Business Center is located at 3680 E Guasti Rd, Ontario, CA 91761-3708, in California. The gas station sits in the warehouse parking lot and is open to Costco members, selling Regular and Premium — this location does not sell diesel. Gas station hours are 6 a.m. – 10 p.m. on weekdays, 6 a.m. – 8:30 p.m. on Saturdays and 6 a.m. – 7:30 p.m. on Sundays, in local time.
Station details
Ontario Gas station hours
- Mon–Fri
- 6 a.m. – 10 p.m.
- Saturday
- 6 a.m. – 8:30 p.m.
- Sunday
- 6 a.m. – 7:30 p.m.
Ontario Warehouse hours
- Mon–Fri
- 7 a.m. – 6 p.m.
- Saturday
- 7 a.m. – 6 p.m.
- Sunday
- 7 a.m. – 6 p.m.
Costco gas near Ontario Business Center
- 1Rancho CucamongaRancho Cucamonga, CA · 1.8 mi$5.899Regular
- 2EastvaleEastvale, CA · 4.7 mi$5.959Regular
- 3MontclairMontclair, CA · 6.8 mi$5.899Regular
- 4FontanaFontana, CA · 9.0 mi$6.099Regular
- 5Chino HillsChino Hills, CA · 10.3 mi$5.999Regular
Distances are straight-line. Prices across the border are shown in that country’s units (¢ per litre).
Cities near Ontario
- Costco gas prices Rancho Cucamonga · CA · 2 mi$5.899
- Costco gas prices Eastvale · CA · 5 mi$5.959
- Costco gas prices Montclair · CA · 7 mi$5.899
- Costco gas prices Fontana · CA · 9 mi$6.099
- Costco gas prices Chino Hills · CA · 10 mi$5.999
- Costco gas prices Corona · CA · 13 mi$6.099
- Costco gas prices San Dimas · CA · 15 mi$5.999
- Costco gas prices Yorba Linda · CA · 16 mi$6.299
At this location
- Warehouse opened
- August 2020
- Warehouse phone
- (909) 789-1221
- Pumps open before the warehouse
- 1 hour on weekdays
Costco publishes one number per warehouse; there is no separate line for the gas station.
Frequently asked questions
How much is gas at Costco Ontario Business Center today?
As of the September 30, 2026 reading: Regular $5.899 and Premium $6.359 per gallon. Prices are collected once a day, so the pump can differ.
What time does the Costco Ontario Business Center gas station open?
The pumps are open 6 a.m. – 10 p.m. weekdays, 6 a.m. – 8:30 p.m. Saturdays and 6 a.m. – 7:30 p.m. Sundays, in local time. The pumps open 1 hour before the warehouse on weekdays.
Does the Costco Ontario Business Center gas station sell diesel?
No — this station sells Regular and Premium, and has reported no diesel price in the last 30 days.
Is Costco Ontario Business Center cheaper than the average Costco station in California?
Yes — at $5.899, Regular here is $0.143 below the California Costco average of $6.042.
Where is the Costco Ontario Business Center gas station?
At 3680 E Guasti Rd, Ontario, CA 91761-3708. It sits in the Costco warehouse parking lot and is open to members only.
Do you need a Costco membership to buy gas?
Yes — a Gold Star, Executive or Business membership card has to be scanned at the pump before it will dispense, though a Costco Shop Card also works for non-members.
What payment methods does the Costco gas station accept?
Visa, PIN debit and the Costco Shop Card; US Costco fuel pumps take no cash and no Mastercard, American Express or Discover.
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