Portland (PDX) to San Diego (SAN): 934 miles (1,503 km) great-circle, about 2h 20m nonstop by our estimate. Cheapest fare observed: $326 round-trip on Frontier, with 1 stop, departing June 21, 2026.
$326 round-trip, Frontier F91106, departing 2026-06-21 at 18:19, returning 2026-06-26. The recorded itinerary left on a Sunday, returning on a Friday 5 nights later; the fare was observed 57 days before departure. "Book this flight" opens Kiwi.com with the same airline and dates.
At $326, it ranked 11th of the 30 round-trip fares we recorded from PDX (median $378). That is 34.9 cents per great-circle mile (round-trip price over one-way distance), above the PDX median of 21.2 cents across 30 round-trip routes.
Routes from PDX of similar length: Denver (989 mi) at $263 and Los Angeles (835 mi) at $233.
Frontier had the cheapest fare on 7 of 30 PDX routes. It is the 25th longest of the 30 routes we track from PDX.
Of 11 departure airports with a fare to San Diego, Portland (PDX) ranked 8th at $326. 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.