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Sources say that South Korea's jet fuel exports returned to pre-war levels in May.

Analysts and trade sources reported that South Korea's refiners increased jet fuel exports to pre-Iran War levels in May, helped by an increase in?crude oil imports, and encouraged by the robust margins of refining.

The rebound of?one of Asia’s top fuel exporters as seen in a series of spot cargo sales has eased concerns about a tight supply, and helped to cool down prices in the area.

In the last two weeks, spot premiums on aviation fuel fell by 50% to about $2 per barrel. This compares to a record-high of more than 20 dollars in March.

Data from Kpler and Vortexa, as well as a trade source, showed that South Korea shipped between 1.1 and 1.2 million tons of jet fuel (8.67 to 9.46 millions barrels). This was the highest amount since August.

Kpler reports that May volumes increased 36% compared to the low volume of April. The data shows that South Korean shipments accounted for 30% of jet fuel imported in Asia Pacific so far this year, up from just 23% at the beginning of 2025.

LSEG data revealed that in addition to the dramatically lower premiums on aviation fuel, regrade'spreads' between diesel with 10ppm sulphur and jet fuel are now at slight discounts.

HIGHER REFINING, MORE CRUDE OUTPUT

The U.S. and Israeli war against Iran has resulted in a defacto blockade of Strait of Hormuz. A fifth of world oil used to be shipped through this strait. And the disruptions of crude supply led to lower runs by Asia's refiners.

Ivan Mathews of Vortexa, head of APAC Analysis, stated that South Korean refineries have recovered their crude imports to around 80% pre-disruption in May. He also said he expected them to increase jet oil exports in June because of higher refining production.

According to FGE NexantECA's senior analyst, Samuel?Kong, the average crude run for the country's refineries is estimated to be higher in May and more than twice as much as it was in April, at 2.4 or more million barrels of oil per day. However, they are still lower than their pre-war level of 2.9 millions bpd.

According to government data, the South Korean refinery's throughput in April was 2.18 million barrels per day.

Kpler data shows that crude arrivals in the world's fourth-largest oil importer rose to 2.27 million barrels per day in May after falling to 1.51 million in April. This was the lowest level since 2013. The majority of the volumes came from Saudi Arabia and the U.S.

US WEST COAST PRICE RISES ARE AN INCENTIVE TO EXPORTS

Kpler data shows that a fifth of South Korean jet-fuel exports to the U.S. in May was bound for the U.S.

Mathews, Vortexa's Mathews, said arbitrage was favourable to South Korean refiners who could send jet fuel?to the U.S. West Coast. This could lead?to increased production and exports.

Calculations showed that the U.S. West Coast Jet Fuel?swap price has been over $20 per barrel higher than those in Asia since May end. This is up from $10 per barrel more two weeks ago.

SSY data from LSEG revealed that the cost to ship 300,000 barrels refined fuels along this route was $7 per barrel.

(source: Reuters)