Jeju Air’s 48-Hour Flash Sale offers one-way fares from ¥14,730 all-in on 12 routes linking nine Japanese airports with Seoul (Incheon) and Busan. Most fares are STANDARD with 15kg of checked baggage included, though Nagoya (Chubu)–Seoul is BASIC only. Bookings close October 30, 2026, for travel through November 30. Contents Overview of Jeju Air’s 48-Hour Flash Sale Lowest One-Way Fares: Seoul (Incheon) Routes Lowest One-Way Fares: Busan Routes Estimated Round-Trip Cost Note the Difference Between STANDARD and BASIC Fares Travel Period and Trip Planning Tips Things to Check Before Booking How to Book Summary Overview of Jeju Air’s 48-Hour Flash Sale Jeju Air, a South Korean low-cost carrier (LCC), is running a “48-Hour Flash Sale” on Japan–Korea routes from October 28 to October 30, 2026. One-way fares start from ¥14,730 total, and the displayed prices already include fuel surcharges, airport fees and other charges. The STANDARD fare includes