Phoenix (PHX) to San Diego (SAN): 304 miles (489 km) great-circle, about 1h 05m nonstop by our estimate. Cheapest fare observed: $191 round-trip on Frontier, nonstop, departing July 2, 2026.
$191 round-trip, Frontier F91571, departing 2026-07-02 at 14:20, returning 2026-07-06. The recorded itinerary left on a Thursday, returning on a Monday 4 nights later; the fare was observed 68 days before departure. "Book this flight" opens Kiwi.com with the same airline and dates.
At $191, it ranked 8th of the 30 round-trip fares we recorded from PHX (median $231). That is 62.8 cents per great-circle mile (round-trip price over one-way distance), above the PHX median of 17.4 cents across 30 round-trip routes.
Routes from PHX of similar length: Las Vegas (256 mi) at $162 and Los Angeles (370 mi) at $124.
Frontier had the cheapest fare on 19 of 30 PHX routes. It is the 29th longest of the 30 routes we track from PHX.
Of 11 departure airports with a fare to San Diego, Phoenix (PHX) ranked 4th at $191. 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/Phoenix, America/Los_Angeles; flight time is our estimate.