South Korea's airlines will impose fuel surcharges on international passengers next month to reflect an increase in jet fuel prices, industry sources said Monday.

In the past five months through September, local airlines didn't impose fuel surcharges, as the average price of jet fuel remained below US$1.50 per gallon.

But the jet fuel, measured through Sept. 15 this month and the benchmark for fuel surcharges in October, averaged $1.54 per gallon, according to airline officials.

Local airlines are usually allowed to impose a fuel surcharge on a monthly basis when the average jet fuel price hovers above $1.50 a gallon, though the surcharges vary depending on travel distance.

For example, customers who travel less than 500 miles (805 kilometers) are required to pay 1,200 won (US$1.00) in fuel surcharges but those who travel more than 10,000 miles have to pay 9,600 won, they said.

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