Adelaide Petrol Prices — Week Ending 18 October 2026
Diesel: 283.0 c/L · National U91 average: 242.1 c/L
AIP weekly report · week ending 18 October 2026- Adelaide U91 rose 1.0 c/L from the week ending 11 October 2026 (235.8 c/L).
- At 236.8 c/L, Adelaide was the cheapest of the 8 capitals for U91, 5.3 c/L lower than the national average (242.1 c/L).
- That is 73.3 c/L higher than in the week ending 12 July 2026 (163.5 c/L), the earliest week on record here.
- Diesel averaged 283.0 c/L, 46.2 c/L more than U91; it fell 1.9 c/L on the week before.
Adelaide's prices tend to move in sharp cycles, climbing quickly to a peak and then falling away before the next rise. The swings can be steep, so the difference between a good day and a bad day to fill up is often significant.
South Australia runs a real-time fuel pricing scheme, so stations report their prices and you can check live figures across the city. Seeing where the cycle sits before you commit is the simplest way to avoid filling up at the top.
| 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 |
Adelaide week by week
| Week ending | U91 | Change | Diesel | Change |
|---|---|---|---|---|
| 18 October 2026 | 236.8 | +1.0 c/L | 283.0 | −1.9 c/L |
| 11 October 2026 | 235.8 | +2.9 c/L | 284.9 | −2.9 c/L |
| 4 October 2026 | 232.9 | −0.6 c/L | 287.8 | −0.5 c/L |
| 27 September 2026 | 233.5 | +11.1 c/L | 288.3 | +15.6 c/L |
| 20 September 2026 | 222.4 | +15.9 c/L | 272.7 | +17.7 c/L |
| 13 September 2026 | 206.5 | — | 255.0 | +5.0 c/L |
| 6 September 2026 | — | — | 250.0 | +0.6 c/L |
| 30 August 2026 | 203.0 | +1.8 c/L | 249.4 | +4.5 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 Adelaide prices?
Default price: Adelaide 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 Adelaide in the week ending 18 October 2026?
- Regular unleaded (U91) averaged 236.8 c/L across Adelaide for the week ending 18 October 2026, and diesel averaged 283.0 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 Adelaide
- 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. SA drivers can check live station prices via the state's fuel price service.