Detroit (DTW) to Seattle (SEA): 1,922 miles (3,093 km) great-circle, about 4h 20m nonstop by our estimate. Cheapest fare observed: $375 round-trip on Frontier, with 2 stops, departing June 1, 2026.
$375 round-trip, Frontier F93565, departing 2026-06-01 at 07:55, returning 2026-06-13. The recorded itinerary left on a Monday, returning on a Saturday 12 nights later; the fare was observed 37 days before departure. "Book this flight" opens Kiwi.com with the same airline and dates.
At $375, it ranked 19th of the 30 round-trip fares we recorded from DTW (median $275). That is 19.5 cents per great-circle mile (round-trip price over one-way distance), below the DTW median of 22.2 cents across 30 round-trip routes.
Routes from DTW of similar length: Los Angeles (1,975 mi) at $280 and Queretaro (1,785 mi) at $494.
Frontier had the cheapest fare on 17 of 30 DTW routes. It is the 11th longest of the 30 routes we track from DTW.
Of 18 departure airports with a fare to Seattle, Detroit (DTW) ranked 17th at $375. Lowest: $122 from Houston (IAH); highest: $690 from Punta Cana (PUJ); 5 nonstop. Cheapest-fare airlines (routes): Frontier (13), Alaska Airlines (2), Air Canada (1), Southwest (1) and United Airlines (1).
Travelpayouts fares (cheapest per route, observed April 25, 2026); OurAirports coordinates and elevations; IANA zones America/New_York, America/Los_Angeles; flight time is our estimate.