Seattle (SEA) to Los Angeles (LAX): 955 miles (1,537 km) great-circle, about 2h 25m nonstop by our estimate. Cheapest fare observed: $77 round-trip on Frontier, nonstop, departing June 2, 2026.
$77 round-trip, Frontier F91178, departing 2026-06-02 at 11:21, returning 2026-06-03. The recorded itinerary left on a Tuesday, returning on a Wednesday 1 night later; the fare was observed 38 days before departure. "Book this flight" opens Kiwi.com with the same airline and dates.
At $77, it was the cheapest of the 30 round-trip fares we recorded from SEA (median $591). That is 8.1 cents per great-circle mile (round-trip price over one-way distance), below the SEA median of 19.2 cents across 30 round-trip routes.
Routes from SEA of similar length: Ontario, California (957 mi) at $86 and Denver (1,022 mi) at $242.
Frontier had the cheapest fare on 10 of 30 SEA routes. It is the 28th longest of the 30 routes we track from SEA.
Of 40 departure airports with a fare to Los Angeles, Seattle (SEA) ranked 1st at $77. Lowest: $77 from Seattle (SEA); highest: $1224 from Sapporo (CTS); 11 nonstop. Cheapest-fare airlines (routes): Frontier (18), Spirit (5), Southwest (3), EVA Air (2), Fiji Airways (2) and WestJet (2), plus 8 more.
The reverse, Los Angeles (LAX) to Seattle (SEA), was $199 round-trip on Frontier, nonstop, departing May 8, 2026. Los Angeles to Seattle 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.