San Francisco (SFO) to San Diego (SAN): 447 miles (719 km) great-circle, about 1h 25m nonstop by our estimate. Cheapest fare observed: $76 round-trip on Frontier, nonstop, departing June 9, 2026.
$76 round-trip, Frontier F94306, departing 2026-06-09 at 22:27, returning 2026-06-16. The recorded itinerary left on a Tuesday, returning on a Tuesday 7 nights later; the fare was observed 45 days before departure. "Book this flight" opens Kiwi.com with the same airline and dates.
At $76, it ranked 2nd of the 30 round-trip fares we recorded from SFO (median $646). That is 17.0 cents per great-circle mile (round-trip price over one-way distance), close to the SFO median of 16.9 cents across 30 round-trip routes.
Routes from SFO of similar length: Las Vegas (413 mi) at $51 and Portland (551 mi) at $403.
Frontier had the cheapest fare on 7 of 30 SFO routes. It is the 28th longest of the 30 routes we track from SFO.
Of 11 departure airports with a fare to San Diego, San Francisco (SFO) ranked 1st at $76. Lowest: $76 from San Francisco (SFO); highest: $563 from Washington DC (IAD); 4 nonstop. Cheapest-fare airlines (routes): Frontier (8), Alaska Airlines (2) and WestJet (1).
The reverse, San Diego (SAN) to San Francisco (SFO), was $185 round-trip on Frontier, nonstop, departing May 11, 2026. San Diego to San Francisco flights.
Travelpayouts fares (cheapest per route, observed April 25, 2026); OurAirports coordinates and elevations; IANA zones America/Los_Angeles, America/Los_Angeles; flight time is our estimate.