Flights Chicago → Washington — September 18, 2026

One way · Economy · 1 adult · price per person

The cheapest itinerary observed for Friday, September 18, 2026 on the Chicago–Washington route: 1 stop itinerary (2 flights) via Atlanta Hartsfield-Jackson (ATL), from Chicago O'Hare (ORD) to Washington Dulles (IAD), first flight Frontier Airlines F91596, departs 10:26 AM, arrives 5:18 PM, total travel time 5h 52m including layovers, flight time 4h 3m (layovers excluded), $145 per person. Fare as listed by Aviasales: carry-on bag not included (personal item only), checked bag not included, changes not allowed, non-refundable. Price found in an Aviasales search on September 8, 2026 and read by AirSource on September 10, 2026, 20:47 UTC: it is not guaranteed and is confirmed on Aviasales at booking time. The cheapest direct flight observed: American Airlines AA1200, from Chicago O'Hare (ORD) to Washington Reagan National (DCA), departs 10:35 AM, arrives 1:38 PM, direct, 2h 3m, $146 per person. Fare as listed by Aviasales: carry-on bag included, checked bag not included, changes not allowed, non-refundable.