Costco Gas Prices in Ontario, California
Ontario Business Center · Warehouse #947
3680 E GUASTI RD, Ontario, California 91761-3708
Prices updated: August 17, 2026 at 7:00 PM
Regular
$4.999
PRICE PER GALLON
Press
Premium
$5.399
PRICE PER GALLON
Press
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 $4.999/gal, premium at $5.399/gal. Prices were last updated on August 17, 2026 at 7:00 PM.
Get directions to this Costco gas station30-Day Price History
30-day change
Regular
$4.999+0.040 (0.8%)
Premium
$5.399+0.040 (0.7%)
DateRegPrem
Aug 17, 7:00 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
Aug 5, 3:00 PM$5.199$5.649
Aug 4, 9:00 PM$5.199$5.599
Aug 4, 3:00 AM—$5.599
Aug 4, 2:00 AM$5.199$5.599
Aug 3, 5:00 PM$5.129$5.559
Aug 2, 6:00 PM$5.179$5.659
Aug 1, 7:00 PM$5.229$5.659
Aug 1, 6:00 PM$5.229$5.759
Jul 30, 1:00 AM$5.199$5.699
Jul 27, 4:00 PM$5.199$5.599
Jul 25, 3:00 PM$5.099$5.559
Jul 24, 5:00 PM$5.099$5.499
Jul 22, 9:00 PM—$5.499
Jul 22, 8:00 PM$5.099$5.499
Jul 21, 10:00 PM$5.029$5.499
Jul 21, 4:00 PM$4.999$5.399
Jul 20, 5:00 PM$4.959$5.359