San Diego (SAN) to San Francisco (SFO): 447 miles (719 km) great-circle, about 1h 25m nonstop by our estimate. Cheapest fare observed: $185 round-trip on Frontier, nonstop, departing May 11, 2026.
$185 round-trip, Frontier F93383, departing 2026-05-11 at 19:10, returning 2026-05-17. The recorded itinerary left on a Monday, returning on a Sunday 6 nights later; the fare was observed 16 days before departure. "Book this flight" opens Kiwi.com with the same airline and dates.
At $185, it ranked 9th of the 30 round-trip fares we recorded from SAN (median $279). That is 41.4 cents per great-circle mile (round-trip price over one-way distance), above the SAN median of 15.0 cents across 30 round-trip routes.
Routes from SAN of similar length: Salt Lake City (627 mi) at $153 and Las Vegas (259 mi) at $52.
Frontier had the cheapest fare on 16 of 30 SAN routes. It is the 28th longest of the 30 routes we track from SAN.
Of 19 departure airports with a fare to San Francisco, San Diego (SAN) ranked 6th at $185. Lowest: $126 from Los Angeles (LAX); highest: $483 from New York (JFK); 6 nonstop. Cheapest-fare airlines (routes): Frontier (13), Southwest (3), American Airlines (1), United Airlines (1) and WestJet (1).
The reverse, San Francisco (SFO) to San Diego (SAN), was $76 round-trip on Frontier, nonstop, departing June 9, 2026. San Francisco to San Diego 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.