Don't get pumped.
As of 22 October 2026, the cheapest Diesel in Western Australia is 248.3c per litre at Vibe, Ascot — versus the Western Australia average of 279.7c (2.1c below the national average of 281.8c). Across 977 stations, Diesel ranges from 248.3c to 400.0c, so filling a 50-litre tank at the cheapest station saves about $15.70 over the state average. Over the past week the WA average has fallen 1.1c.
Compare Diesel across 977 stations in Western Australia. Updated 03:59 PM, 22 Oct 2026.
Over the past 90 days, Diesel in Western Australia has averaged 288.1c per litre, peaking at 314.4c on 24 July and bottoming out at 240.7c on 31 July — a range of 73.7c. Over the past week the WA average has fallen 1.1c. Timing a fill-up around that range matters: on a 50-litre tank, filling at the period low instead of the peak saves $36.85.
| Month | Average Diesel |
|---|---|
| April 2026 | 260.4c |
| May 2026 | 252.2c |
| June 2026 | 269.8c |
| July 2026 | 291.1c |
| August 2026 | 288.6c |
| September 2026 | 290.1c |
| October 2026 | 277.8c |
The cheapest Diesel price in Western Australia right now is 248.3c per litre, across 977 stations tracked. The cheapest suburb right now is Oakford at a 252.8c average across 2 stations. Filling a 50-litre tank at the cheapest station instead of a station charging the state average of 279.7c saves $15.70. 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 279.7c per litre — 2.1c below the national average of 281.8c. Prices at individual stations range from 248.3c to 400.0c, a spread of 151.7c that shows how much shopping around can save. Over the past week the WA average has fallen 1.1c. Petrolmate computes this average from every station reporting Diesel in Western Australia via the official government price feed, refreshed twice daily.
Solo is currently the cheapest brand for Diesel in Western Australia at 257.5c per litre average across 3 stations. The gap between the cheapest brand (Solo, 257.5c) and the priciest in our list (Gull, 274.5c) is 17.0c per litre — about $8.50 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 288.1c per litre, peaking at 314.4c on 24 July and bottoming out at 240.7c on 31 July — a range of 73.7c. Over the past week the WA average has fallen 1.1c. 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.