Altius recorded 313 priced readings of nonstop business-class round trips from Boston (BOS) to Seoul (ICN) booked 30 days out, across 138 departure dates between 2026-05-20 and 2026-10-04. Observed fares ran from US$6,851 to US$18,554. The lowest fare Altius scored on this window was US$6,851 for a 2026-07-06 departure, seen on 2026-06-06 — DECENT at the time, 12.7% below the US$7,848 this route was typically running that day.
Altius recorded 309 priced readings of nonstop business-class round trips from Boston (BOS) to Seoul (ICN) booked 60 days out, across 138 departure dates between 2026-05-20 and 2026-10-04. Observed fares ran from US$6,851 to US$11,903. Every fare Altius recorded for trips booked 60 days out stayed close enough to what this route typically costs that none was flagged.
Altius recorded 309 priced readings of nonstop business-class round trips from Boston (BOS) to Seoul (ICN) booked 90 days out, across 138 departure dates between 2026-05-20 and 2026-10-04. Observed fares ran from US$6,851 to US$12,953. The lowest fare Altius scored on this window was US$6,851 for a 2026-08-25 departure, seen on 2026-05-27 — IMPRESSIVE at the time, 28.6% below the US$9,595 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.