Altius recorded 308 priced readings of nonstop business-class round trips from Chicago (ORD) to Seoul (ICN) booked 90 days out, across 138 departure dates between 2026-05-20 and 2026-10-05. Observed fares ran from US$6,671 to US$11,703. The lowest fare Altius scored on this window was US$6,671 for a 2026-08-24 departure, seen on 2026-05-26 — IMPRESSIVE at the time, 29% below the US$9,396 this route was typically running that day.
A fare can move between our two readings of the same day, most often on the days furthest below typical. Where a day's two readings differ enough to matter, the chart marks that day and both readings can be read separately.