Perth Petrol Prices — Week Ending 18 October 2026
Diesel: 270.0 c/L · National U91 average: 242.1 c/L
AIP weekly report · week ending 18 October 2026- Perth U91 rose 0.5 c/L from the week ending 11 October 2026 (237.9 c/L).
- At 238.4 c/L, Perth was the 7th dearest of the 8 capitals for U91, 3.7 c/L lower than the national average (242.1 c/L).
- That is 71.3 c/L higher than in the week ending 12 July 2026 (167.1 c/L), the earliest week on record here.
- Diesel averaged 270.0 c/L, 31.6 c/L more than U91; it fell 2.4 c/L on the week before.
Perth runs the most disciplined fuel cycle in the country. Prices jump on a set day of the week, then drift down over the following days until the next rise, so the cheapest and dearest days are easy to predict.
Western Australia's FuelWatch, a WA Government service, goes a step further than most schemes. Stations must fix their price for the whole day and lodge it in advance, so FuelWatch can publish tomorrow's prices today. That lets you plan a fill around the cycle rather than guess at it.
| City | U91 (c/L) | Diesel (c/L) |
|---|---|---|
| Sydney | 241.3 | 277.5 |
| Melbourne | 241.7 | 279.0 |
| Brisbane | 239.9 | 281.4 |
| Perth | 238.4 | 270.0 |
| Adelaide | 236.8 | 283.0 |
| Hobart | 250.0 | 282.5 |
| Canberra | 246.3 | 287.3 |
| Darwin | 249.0 | 288.7 |
| National average | 242.1 | 280.7 |
Perth week by week
| Week ending | U91 | Change | Diesel | Change |
|---|---|---|---|---|
| 18 October 2026 | 238.4 | +0.5 c/L | 270.0 | −2.4 c/L |
| 11 October 2026 | 237.9 | +5.1 c/L | 272.4 | −2.9 c/L |
| 4 October 2026 | 232.8 | +0.1 c/L | 275.3 | −4.4 c/L |
| 27 September 2026 | 232.7 | +7.3 c/L | 279.7 | +13.3 c/L |
| 20 September 2026 | 225.4 | +15.5 c/L | 266.4 | +15.3 c/L |
| 13 September 2026 | 209.9 | — | 251.1 | +5.3 c/L |
| 6 September 2026 | — | — | 245.8 | −0.4 c/L |
| 30 August 2026 | 203.4 | +3.0 c/L | 246.2 | +4.0 c/L |
| Change is against the week before and is shown only where both weeks' reports exist. A dash means AIP's report for that fuel and week could not be recovered, so the week is left blank rather than estimated. Weeks with no report at all are not listed. | ||||
What does a drive cost at Perth prices?
Default price: Perth average U91, week ending 18 October 2026. Fuel only — tolls, wear and rest stops not included.
Frequently asked questions
- What was the average petrol price in Perth in the week ending 18 October 2026?
- Regular unleaded (U91) averaged 238.4 c/L across Perth for the week ending 18 October 2026, and diesel averaged 270.0 c/L. The national average was 242.1 c/L.
- Why is this a weekly average and not a live price?
- Pump prices cycle within a week, so any single moment misleads. The weekly average is the fair comparison line. It comes from the Australian Institute of Petroleum's weekly report; the figures here are the week ending 18 October 2026. AIP publishes each report on the Monday after the week it covers.
Trip costs from and to Perth
- Australian Institute of Petroleum — weekly petrol prices report, week ending 18 October 2026verified
- Australian Institute of Petroleum — weekly diesel prices report, week ending 18 October 2026verified
- ACCC weekly fuel price monitoringcross-checked
AIP weekly averages for the week ending 18 October 2026. Individual stations vary with the price cycle. WA drivers can check live station prices via the state's fuel price service.