Flights San Francisco → San Diego — September 21, 2026

One way · Economy · 1 adult · price per person

The cheapest itinerary observed for Monday, September 21, 2026 on the San Francisco–San Diego route: 1 stop itinerary (2 flights) via Las Vegas Harry Reid (LAS), from San Francisco International (SFO) to San Diego International (SAN), first flight Frontier Airlines F92486, departs 2:28 PM, arrives 8:17 PM, total travel time 5h 49m including layovers, flight time 3h 11m (layovers excluded), $91 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 6, 2026 and read by AirSource on September 10, 2026, 20:49 UTC: it is not guaranteed and is confirmed on Aviasales at booking time. The cheapest direct flight observed: Alaska Airlines AS3306, from San Francisco International (SFO) to San Diego International (SAN), departs 9:13 PM, arrives 10:59 PM, direct, 1h 46m, $98 per person. Fare as listed by Aviasales: carry-on bag included, checked bag not included, changes not allowed, non-refundable.