Seattle (SEA) to San Francisco (SFO): 679 miles (1,093 km) great-circle, about 1h 50m nonstop by our estimate. Cheapest fare observed: $162 round-trip on Southwest, with 1 stop, departing July 13, 2026.
$162 round-trip, Southwest WN2267, departing 2026-07-13 at 17:35, returning 2026-07-16. The recorded itinerary left on a Monday, returning on a Thursday 3 nights later; the fare was observed 79 days before departure. "Book this flight" opens Kiwi.com with the same airline and dates.
At $162, it ranked 4th of the 30 round-trip fares we recorded from SEA (median $591). That is 23.9 cents per great-circle mile (round-trip price over one-way distance), above the SEA median of 19.2 cents across 30 round-trip routes.
Routes from SEA of similar length: Las Vegas (867 mi) at $126 and Los Angeles (955 mi) at $77.
SEA to SFO is the only one of 30 SEA routes where Southwest priced cheapest. It is the 30th longest of the 30 routes we track from SEA.
Of 19 departure airports with a fare to San Francisco, Seattle (SEA) ranked 4th at $162. 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).
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.