Flights Washington → Chicago — September 15, 2026

One way · Economy · 1 adult · price per person

The cheapest itinerary observed for Tuesday, September 15, 2026 on the Washington–Chicago route: 1 stop itinerary (2 flights) via Denver International (DEN), from Washington Reagan National (DCA) to Chicago O'Hare (ORD), first flight Frontier Airlines F9689, departs 6:00 PM, arrives 12:23 AM the next day, total travel time 7h 23m including layovers, flight time 6h 20m (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 AA2633, from Washington Reagan National (DCA) to Chicago O'Hare (ORD), departs 7:42 AM, arrives 9:10 AM, direct, 2h 28m, $151 per person. Fare as listed by Aviasales: carry-on bag included, checked bag not included, changes not allowed, non-refundable.