Seattle (SEA) to Phoenix (PHX): 1,107 miles (1,782 km) great-circle, about 2h 45m nonstop by our estimate. Cheapest fare observed: $279 round-trip on Alaska Airlines, nonstop, departing May 22, 2026.
$279 round-trip, Alaska Airlines AS604, departing 2026-05-22 at 19:06, returning 2026-05-26. The recorded itinerary left on a Friday, returning on a Tuesday 4 nights later; the fare was observed 27 days before departure. "Book this flight" opens Kiwi.com with the same airline and dates.
At $279, it ranked 10th of the 30 round-trip fares we recorded from SEA (median $591). That is 25.2 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: San Diego (1,051 mi) at $355 and Denver (1,022 mi) at $242.
Alaska Airlines had the cheapest fare on 6 of 30 SEA routes. It is the 24th longest of the 30 routes we track from SEA.
Of 12 departure airports with a fare to Phoenix, Seattle (SEA) ranked 10th at $279. Lowest: $48 from Denver (DEN); highest: $409 from San Jose (SJC); 8 nonstop. Cheapest-fare airlines (routes): Frontier (8), Alaska Airlines (1), JetBlue (1), Southwest (1) and Volaris (1).
The reverse, Phoenix (PHX) to Seattle (SEA), was $279 round-trip on Frontier, 1 stop, departing April 25, 2026. Phoenix to Seattle flights.
Travelpayouts fares (cheapest per route, observed April 25, 2026); OurAirports coordinates and elevations; IANA zones America/Los_Angeles, America/Phoenix; flight time is our estimate.