Altius recorded 55 priced readings of nonstop business-class round trips from Lyon (LYS) to Constantine (CZL) booked 90 days out, across 28 departure dates between 2026-08-19 and 2026-10-05. Observed fares ran from US$1,050 to US$1,092. Every fare Altius recorded for trips booked 90 days out stayed close enough to what this route typically costs that none was flagged.