Don't get pumped.
As of 7 September 2026, the cheapest Diesel in Western Australia is 227.9c per litre at Petro Fuels, Calista — versus the Western Australia average of 256.9c (0.4c above the national average of 256.5c). Across 1,217 stations, Diesel ranges from 227.9c to 390.0c, so filling a 50-litre tank at the cheapest station saves about $14.50 over the state average. Over the past week the WA average has risen 36.3c.
Compare Diesel across 1,217 stations in Western Australia. Updated 05:58 AM, 07 Sep 2026.
Over the past 90 days, Diesel in Western Australia has averaged 293.0c per litre, peaking at 320.1c on 22 July and bottoming out at 223.6c on 9 June — a range of 96.5c. Over the past week the WA average has risen 36.3c. Timing a fill-up around that range matters: on a 50-litre tank, filling at the period low instead of the peak saves $48.25.
| Month | Average Diesel |
|---|---|
| April 2026 | 260.4c |
| May 2026 | 252.2c |
| June 2026 | 286.6c |
| July 2026 | 297.7c |
| August 2026 | 288.6c |
| September 2026 | 288.9c |
The cheapest Diesel price in Western Australia right now is 227.9c per litre, across 1,217 stations tracked. The cheapest suburb right now is Oakford at a 233.1c average across 2 stations. Filling a 50-litre tank at the cheapest station instead of a station charging the state average of 256.9c saves $14.50. See the live cheapest-stations list on this page for the exact station, address and suburb. Prices update twice daily from the official state government feed, so the cheapest station can change between the morning and afternoon updates — check again before you drive.
The current Western Australia average for Diesel is 256.9c per litre — 0.4c above the national average of 256.5c. Prices at individual stations range from 227.9c to 390.0c, a spread of 162.1c that shows how much shopping around can save. Over the past week the WA average has risen 36.3c. Petrolmate computes this average from every station reporting Diesel in Western Australia via the official government price feed, refreshed twice daily.
Burk is currently the cheapest brand for Diesel in Western Australia at 236.2c per litre average across 16 stations. The gap between the cheapest brand (Burk, 236.2c) and the priciest in our list (Liberty, 251.1c) is 14.9c per litre — about $7.45 per 50-litre tank. Brand averages are recalculated twice daily from official price data, so the cheapest brand can change with the price cycle.
Over the past 90 days, Diesel in Western Australia has averaged 293.0c per litre, peaking at 320.1c on 22 July and bottoming out at 223.6c on 9 June — a range of 96.5c. Over the past week the WA average has risen 36.3c. Monthly averages for the past half-year are published in the table on this page. All figures come from official Western Australia government price reporting, aggregated daily by Petrolmate.