Don't get pumped.
As of 9 September 2026, the cheapest Diesel in Western Australia is 229.9c per litre at Vibe, Byford — versus the Western Australia average of 258.7c (0.5c above the national average of 258.2c). Across 1,216 stations, Diesel ranges from 229.9c to 390.0c, so filling a 50-litre tank at the cheapest station saves about $14.40 over the state average. Over the past week the WA average has fallen 5.3c.
Compare Diesel across 1,216 stations in Western Australia. Updated 03:54 PM, 09 Sep 2026.
Over the past 89 days, Diesel in Western Australia has averaged 294.1c per litre, peaking at 320.1c on 22 July and bottoming out at 240.7c on 31 July — a range of 79.4c. Over the past week the WA average has fallen 5.3c. Timing a fill-up around that range matters: on a 50-litre tank, filling at the period low instead of the peak saves $39.70.
| 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 | 291.4c |
The cheapest Diesel price in Western Australia right now is 229.9c per litre, across 1,216 stations tracked. The cheapest suburb right now is Oakford at a 237.4c average across 2 stations. Filling a 50-litre tank at the cheapest station instead of a station charging the state average of 258.7c saves $14.40. 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 258.7c per litre — 0.5c above the national average of 258.2c. Prices at individual stations range from 229.9c to 390.0c, a spread of 160.1c that shows how much shopping around can save. Over the past week the WA average has fallen 5.3c. 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 238.4c per litre average across 16 stations. The gap between the cheapest brand (Burk, 238.4c) and the priciest in our list (Liberty, 252.3c) is 13.9c per litre — about $6.95 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 89 days, Diesel in Western Australia has averaged 294.1c per litre, peaking at 320.1c on 22 July and bottoming out at 240.7c on 31 July — a range of 79.4c. Over the past week the WA average has fallen 5.3c. 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.