Altius recorded 302 priced readings of nonstop business-class round trips from Dallas (DFW) to Istanbul (IST) booked 30 days out, across 136 departure dates between 2026-05-20 and 2026-10-04. Observed fares ran from US$4,381 to US$10,741. The lowest fare Altius scored on this window was US$4,381 for a 2026-08-19 departure, seen on 2026-07-20 — STRONG at the time, 20.9% below the US$5,539 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.