Flights San Francisco → Chicago — September 12, 2026

One way · Economy · 1 adult · price per person

The cheapest itinerary observed for Saturday, September 12, 2026 on the San Francisco–Chicago route: 1 stop itinerary (2 flights) via Atlanta Hartsfield-Jackson (ATL), from San Francisco International (SFO) to Chicago O'Hare (ORD), first flight Frontier Airlines F91448, departs 10:05 PM, arrives 9:20 AM the next day, total travel time 9h 15m including layovers, flight time 7h 5m (layovers excluded), $189 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 10, 2026 and read by AirSource on September 10, 2026, 20:48 UTC: it is not guaranteed and is confirmed on Aviasales at booking time. The cheapest direct flight observed: Southwest Airlines WN3556, from San Francisco International (SFO) to Chicago Midway (MDW), departs 11:40 PM, arrives 5:50 AM the next day, direct, 4h 10m, $264 per person. Fare as listed by Aviasales: carry-on bag not included (personal item only), checked bag not included, changes not allowed, non-refundable.