Austin (AUS) to San Diego (SAN): 1,162 miles (1,871 km) great-circle, about 2h 50m nonstop by our estimate. Cheapest fare observed: $210 round-trip on Frontier, with 1 stop, departing May 1, 2026.
$210 round-trip, Frontier F94683, departing 2026-05-01 at 20:39, returning 2026-05-03. The recorded itinerary left on a Friday, returning on a Sunday 2 nights later; the fare was observed 6 days before departure. "Book this flight" opens Kiwi.com with the same airline and dates.
At $210, it ranked 6th of the 30 round-trip fares we recorded from AUS (median $292). That is 18.1 cents per great-circle mile (round-trip price over one-way distance), below the AUS median of 22.5 cents across 30 round-trip routes.
Routes from AUS of similar length: Raleigh-Durham (1,159 mi) at $282 and Guatemala City (1,170 mi) at $593.
Frontier had the cheapest fare on 13 of 30 AUS routes. It is the 19th longest of the 30 routes we track from AUS.
Of 11 departure airports with a fare to San Diego, Austin (AUS) ranked 6th at $210. 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 Austin (AUS), was $190 round-trip on Frontier, 1 stop, departing May 22, 2026. San Diego to Austin flights.
Travelpayouts fares (cheapest per route, observed April 25, 2026); OurAirports coordinates and elevations; IANA zones America/Chicago, America/Los_Angeles; flight time is our estimate.