Seattle (SEA) to Tokyo (TYO): 4,792 miles (7,711 km) great-circle, about 10h 05m nonstop by our estimate. Cheapest fare observed: $856 round-trip on United Airlines, with 1 stop, departing July 7, 2026.
$856 round-trip, United Airlines UA1348, departing 2026-07-07 at 08:30, returning 2026-07-21. The recorded itinerary left on a Tuesday, returning on a Tuesday 14 nights later; the fare was observed 73 days before departure. "Book this flight" opens Kiwi.com with the same airline and dates.
At $856, it ranked 19th of the 30 round-trip fares we recorded from SEA (median $591). That is 17.9 cents per great-circle mile (round-trip price over one-way distance), close to the SEA median of 19.2 cents across 30 round-trip routes.
Routes from SEA of similar length: St. Petersburg (4,867 mi) at $1964 and Moscow (5,195 mi) at $1513.
SEA to TYO is the only one of 30 SEA routes where United Airlines priced cheapest. It is the 12th longest of the 30 routes we track from SEA.
Of 34 departure airports with a fare to Tokyo, Seattle (SEA) ranked 18th at $856. Lowest: $80 from Sapporo (CTS); highest: $1812 from Washington DC (DCA); 11 nonstop. Cheapest-fare airlines (routes): Scoot (4), Frontier (3), WestJet (3), Alaska Airlines (2), Jetstar (2) and Jetstar Japan (2), plus 17 more.
Travelpayouts fares (cheapest per route, observed April 25, 2026); OurAirports coordinates and elevations; IANA zones America/Los_Angeles, Asia/Tokyo; flight time is our estimate.