International air-fare fuel surcharges in South Korea will rise in October as higher crude oil prices lift jet-fuel costs. The surcharge tier will increase to 23 from 21 in September, following three consecutive monthly declines after reaching level 33 in May. Singapore jet fuel, or MOPS, averaged 377.54 cents per gallon, equivalent to $158.57 per barrel, from Aug. 16 through Sept. 15, up about 6.2% from the prior calculation period. Korean Air will charge between 49,000 won and 362,600 won per one-way ticket in October, depending on route distance; Asiana Airlines’ existing October schedule ranges from 53,400 won to 301,200 won. The charges are based on ticket issuance dates, not travel dates. Analysts expect surcharges to continue rising in the second half as oil-market supply concerns persist.