Salt Lake City (SLC) to Seattle (SEA): 688 miles (1,107 km) great-circle, about 1h 55m nonstop by our estimate. Cheapest fare observed: $266 round-trip on Frontier, with 1 stop, departing July 5, 2026.
$266 round-trip, Frontier F94252, departing 2026-07-05 at 22:41, returning 2026-07-07. The recorded itinerary left on a Sunday, returning on a Tuesday 2 nights later; the fare was observed 71 days before departure. "Book this flight" opens Kiwi.com with the same airline and dates.
At $266, it ranked 10th of the 30 round-trip fares we recorded from SLC (median $470). That is 38.7 cents per great-circle mile (round-trip price over one-way distance), above the SLC median of 24.7 cents across 30 round-trip routes.
Routes from SLC of similar length: San Francisco (598 mi) at $164 and Oklahoma City (865 mi) at $306.
Frontier had the cheapest fare on 25 of 30 SLC routes. It is the 26th longest of the 30 routes we track from SLC.
Of 18 departure airports with a fare to Seattle, Salt Lake City (SLC) ranked 12th at $266. 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/Denver, America/Los_Angeles; flight time is our estimate.