Ranked: Delta Air Lines’ Top 15 Long-Haul Routes [Summer 2026 Flights]

Airlines generally make money in the all-important Q3 (July-September), when demand and fares are usually at their highest levels. In that period, Cirium Diio data shows that Delta Air Lines plans 11,895 long-haul departures from the US (double for both ways). That is more than in any other quarter in history. Flights have risen by 2% compared to the prior record.