Flights Chicago → Washington — September 15, 2026

One way · Economy · 1 adult · price per person

The cheapest itinerary observed for Tuesday, September 15, 2026 on the Chicago–Washington route: 1 stop itinerary (2 flights) via Denver International (DEN), from Chicago O'Hare (ORD) to Washington Reagan National (DCA), first flight Frontier Airlines F91483, departs 6:30 AM, arrives 4:59 PM, total travel time 9h 29m including layovers, flight time 6h 21m (layovers excluded), $146 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 5, 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 AA789, from Chicago O'Hare (ORD) to Washington Reagan National (DCA), departs 1:17 PM, arrives 4:24 PM, direct, 2h 7m, $170 per person. Fare as listed by Aviasales: carry-on bag included, checked bag not included, changes not allowed, non-refundable.