Costco Gas Prices in Ontario, California
Ontario Business Center · Warehouse #947
3680 E GUASTI RD, Ontario, California 91761-3708
Prices updated: September 5, 2026 at 3:00 AM
Regular
$5.299
PRICE PER GALLON
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Premium
$5.659
PRICE PER GALLON
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Current gas prices at Costco #947
This Costco gas station is located at 3680 E GUASTI RD in Ontario, California. The latest reported fuel prices are regular at $5.299/gal, premium at $5.659/gal. Prices were last updated on September 5, 2026 at 3:00 AM.
Get directions to this Costco gas station30-Day Price History
30-day change
Regular
$5.299+0.100 (1.9%)
Premium
$5.659+0.060 (1.1%)
DateRegPrem
Sep 5, 3:00 AM$5.299$5.659
Sep 4, 7:00 PM$5.199$5.659
Sep 2, 10:00 PM$5.159$5.659
Sep 2, 3:00 PM$5.129$5.589
Aug 30, 3:00 PM$5.099$5.559
Aug 30, 2:00 PM—$5.559
Aug 30, 1:00 PM$5.099$5.559
Aug 29, 5:00 PM$5.099$5.529
Aug 28, 6:00 PM—$5.529
Aug 28, 5:00 PM$5.079$5.529
Aug 27, 10:00 PM$5.079$5.499
Aug 27, 5:00 PM$5.079$5.479
Aug 26, 3:00 PM$5.059$5.459
Aug 24, 3:00 PM$5.099$5.499
Aug 23, 4:00 PM$5.059$5.459
Aug 22, 5:00 PM—$5.459
Aug 22, 4:00 PM$5.059$5.459
Aug 19, 5:00 PM$4.999$5.399
Aug 17, 4:00 PM$4.999$5.359
Aug 13, 8:00 PM$4.999$5.399
Aug 13, 3:00 PM$4.959$5.359
Aug 12, 10:00 PM$4.959$5.399
Aug 12, 5:00 AM—$5.399
Aug 12, 4:00 AM$4.959$5.399
Aug 10, 9:00 PM$5.059$5.499
Aug 9, 6:00 PM$5.159$5.559
Aug 8, 6:00 PM$5.099$5.499
Aug 7, 7:00 PM$5.199$5.599