Altius recorded 308 priced readings of nonstop business-class round trips from Washington (IAD) to Istanbul (IST) booked 30 days out, across 138 departure dates between 2026-05-20 and 2026-10-05. 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.
Altius recorded 308 priced readings of nonstop business-class round trips from Washington (IAD) to Istanbul (IST) booked 60 days out, across 139 departure dates between 2026-05-20 and 2026-10-05. Observed fares ran from US$5,021 to US$9,971. The lowest fare Altius scored on this window was US$5,021 for a 2026-09-22 departure, seen on 2026-07-24 — IMPRESSIVE at the time, 23.6% below the US$6,572 this route was typically running that day.
Altius recorded 311 priced readings of nonstop business-class round trips from Washington (IAD) to Istanbul (IST) booked 90 days out, across 138 departure dates between 2026-05-20 and 2026-10-05. Observed fares ran from US$5,021 to US$9,621. Every fare Altius recorded for trips booked 90 days out stayed close enough to what this route typically costs that none was flagged.
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.