San Francisco (SFO) to Portland (PDX): 551 miles (886 km) great-circle, about 1h 35m nonstop by our estimate. Cheapest fare observed: $403 round-trip on Alaska Airlines, nonstop, departing May 2, 2026.
$403 round-trip, Alaska Airlines AS1410, departing 2026-05-02 at 07:40, returning 2026-05-05. The recorded itinerary left on a Saturday, returning on a Tuesday 3 nights later; the fare was observed 7 days before departure. "Book this flight" opens Kiwi.com with the same airline and dates.
At $403, it ranked 12th of the 30 round-trip fares we recorded from SFO (median $646). That is 73.2 cents per great-circle mile (round-trip price over one-way distance), above the SFO median of 16.9 cents across 30 round-trip routes.
Routes from SFO of similar length: San Diego (447 mi) at $76 and Las Vegas (413 mi) at $51.
Alaska Airlines had the cheapest fare on 7 of 30 SFO routes. It is the 27th longest of the 30 routes we track from SFO.
Of 8 departure airports with a fare to Portland, San Francisco (SFO) ranked 7th at $403. Lowest: $97 from Denver (DEN); highest: $462 from San Jose (SJC); 4 nonstop. Cheapest-fare airlines (routes): Alaska Airlines (2), American Airlines (2), Frontier (2) and Southwest (2).
The reverse, Portland (PDX) to San Francisco (SFO), was $220 round-trip on Frontier, 1 stop, departing May 15, 2026. Portland to San Francisco 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.