Altius recorded 307 priced readings of nonstop business-class round trips from Washington (IAD) to Tokyo (HND) booked 90 days out, across 138 departure dates between 2026-05-20 and 2026-10-05. Observed fares ran from US$6,112 to US$11,330. The lowest fare Altius scored on this window was US$6,112 for a 2026-11-30 departure, seen on 2026-09-01 — STRONG at the time, 16.4% below the US$7,311 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.