Portland (PDX) to San Francisco (SFO): 551 miles (886 km) great-circle, about 1h 35m nonstop by our estimate. Cheapest fare observed: $220 round-trip on Frontier, with 1 stop, departing May 15, 2026.
$220 round-trip, Frontier F91106, departing 2026-05-15 at 20:46, returning 2026-05-17. The recorded itinerary left on a Friday, returning on a Sunday 2 nights later; the fare was observed 20 days before departure. "Book this flight" opens Kiwi.com with the same airline and dates.
At $220, it ranked 4th of the 30 round-trip fares we recorded from PDX (median $378). That is 39.9 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: Sacramento (492 mi) at $205 and Billings (678 mi) at $363.
Frontier had the cheapest fare on 7 of 30 PDX routes. It is the 29th longest of the 30 routes we track from PDX.
Of 19 departure airports with a fare to San Francisco, Portland (PDX) ranked 7th at $220. 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 Portland (PDX), was $403 round-trip on Alaska Airlines, nonstop, departing May 2, 2026. San Francisco to Portland 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.