Flights San Francisco → Boston — September 12, 2026

One way · Economy · 1 adult · price per person

The cheapest itinerary observed for Saturday, September 12, 2026 on the San Francisco–Boston route: 1 stop itinerary (2 flights) via Atlanta Hartsfield-Jackson (ATL), from San Francisco International (SFO) to Boston Logan (BOS), first flight Frontier Airlines F91448, departs 10:05 PM, arrives 12:09 PM the next day, total travel time 11h 4m including layovers, flight time 7h 24m (layovers excluded), $233 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 7, 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: United Airlines UA1665, from San Francisco International (SFO) to Boston Logan (BOS), departs 11:18 PM, arrives 8:14 AM the next day, direct, 5h 56m, $368 per person. Fare as listed by Aviasales: carry-on bag included, checked bag not included, changes allowed for a fee, non-refundable.