San Jose (SJC) to San Diego (SAN): 417 miles (671 km) great-circle, about 1h 20m nonstop by our estimate. Cheapest fare observed: $119 round-trip on Alaska Airlines, nonstop, departing June 9, 2026.
$119 round-trip, Alaska Airlines AS2409, departing 2026-06-09 at 12:59, 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 $119, it was the cheapest of the 30 round-trip fares we recorded from SJC (median $415). That is 28.5 cents per great-circle mile (round-trip price over one-way distance), above the SJC median of 23.1 cents across 30 round-trip routes.
Routes from SJC of similar length: Las Vegas (386 mi) at $157 and Los Angeles (308 mi) at $229.
Alaska Airlines had the cheapest fare on 12 of 30 SJC routes. It is the 28th longest of the 30 routes we track from SJC.
Of 11 departure airports with a fare to San Diego, San Jose (SJC) ranked 2nd at $119. 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).
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.