Seattle (SEA) to Dallas (DFW): 1,658 miles (2,668 km) great-circle, about 3h 50m nonstop by our estimate. Cheapest fare observed: $200 round-trip on Alaska Airlines, nonstop, departing July 23, 2026.
$200 round-trip, Alaska Airlines AS414, departing 2026-07-23 at 06:02, returning 2026-07-26. The recorded itinerary left on a Thursday, returning on a Sunday 3 nights later; the fare was observed 89 days before departure. "Book this flight" opens Kiwi.com with the same airline and dates.
At $200, it ranked 5th of the 30 round-trip fares we recorded from SEA (median $591). That is 12.1 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: Chicago (1,716 mi) at $735 and Austin (1,769 mi) at $217.
Alaska Airlines had the cheapest fare on 6 of 30 SEA routes. It is the 21st longest of the 30 routes we track from SEA.
Of 27 departure airports with a fare to Dallas, Seattle (SEA) ranked 12th at $200. Lowest: $106 from Atlanta (ATL); highest: $1741 from Hyderabad (HYD); 14 nonstop. Cheapest-fare airlines (routes): Frontier (13), Spirit (5), American Airlines (2), Qatar (2), Alaska Airlines (1) and Emirates (1), plus 3 more.
The reverse, Dallas (DFW) to Seattle (SEA), was $276 round-trip on Frontier, 1 stop, departing July 4, 2026. Dallas to Seattle flights.
Travelpayouts fares (cheapest per route, observed April 25, 2026); OurAirports coordinates and elevations; IANA zones America/Los_Angeles, America/Chicago; flight time is our estimate.