Flights Chicago → San Francisco — September 13, 2026

One way · Economy · 1 adult · price per person

The cheapest itinerary observed for Sunday, September 13, 2026 on the Chicago–San Francisco route: 1 stop itinerary (2 flights) via Las Vegas Harry Reid (LAS), from Chicago O'Hare (ORD) to San Francisco International (SFO), first flight Frontier Airlines F92145, departs 8:55 PM, arrives 8:14 AM 2 days later, total travel time 37h 19m including layovers, flight time 5h 54m (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, 20:06 UTC: it is not guaranteed and is confirmed on Aviasales at booking time. The cheapest direct flight observed: United Airlines UA2374, from Chicago O'Hare (ORD) to San Francisco International (SFO), departs 5:00 AM, arrives 7:41 AM, direct, 4h 41m, $363 per person. Fare as listed by Aviasales: carry-on bag included, checked bag not included, changes not allowed, non-refundable.