Altius recorded 307 priced readings of nonstop business-class round trips from Washington (IAD) to Istanbul (IST) booked 30 days out, across 137 departure dates between 2026-05-20 and 2026-10-04. Observed fares ran from US$5,021 to US$9,621. The lowest fare Altius scored on this window was US$5,021 for a 2026-07-07 departure, seen on 2026-06-07 — DECENT at the time, 12.2% below the US$5,719 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.