South Korean travelers are facing sharply higher airfares starting this month as fuel surcharges roughly double due to surging oil prices tied to escalating tensions in the Middle East. Tickets issued this month carry fuel surcharges at Tier 33, up from Tier 18 in April — the highest level since the current system was introduced in 2016. Fuel surcharges, which airlines add to base fares to offset rising fuel costs, are set monthly based on oil prices and adjusted individually by carriers. At Kor