Flights Seattle → Chicago — September 23, 2026

One way · Economy · 1 adult · price per person

The cheapest itinerary observed for Wednesday, September 23, 2026 on the Seattle–Chicago route: 1 stop itinerary (2 flights) via Las Vegas Harry Reid (LAS), from Seattle-Tacoma (SEA) to Chicago O'Hare (ORD), first flight Frontier Airlines F94204, departs 9:45 PM, arrives 5:38 AM 2 days later, total travel time 29h 53m including layovers, flight time 6h 28m (layovers excluded), $212 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, 21:20 UTC: it is not guaranteed and is confirmed on Aviasales at booking time. The cheapest direct flight observed: Alaska Airlines AS410, from Seattle-Tacoma (SEA) to Chicago O'Hare (ORD), departs 6:00 AM, arrives 12:07 PM, direct, 4h 7m, $234 per person. Fare as listed by Aviasales: carry-on bag included, checked bag not included, changes not allowed, non-refundable.