Perth petrol prices rise to four year high

Perth petrol prices have soared to a four year high, jumping up almost 30 cents overnight.

Today's average price is 152.8 cents a litre, the highest 156.9 cents a litre.

The most expensive service stations include BP, Caltex, Woolworths, Puma and Coles Express.

FuelWatch says there are 30 metro sites selling ULP below 137 cpl. they are mostly United stations.

Motorists can save can $15 on a 60 litre tank if they fuel up at one of those petrol stations.

The jump in prices is due to a dip in international fuel supplies and proposed sanctions against Iran and Russia.

Prices are forecast to drop again on Monday.