Flights Seattle → Los Angeles — September 15, 2026

One way · Economy · 1 adult · price per person

The cheapest itinerary observed for Tuesday, September 15, 2026 on the Seattle–Los Angeles route: 1 stop itinerary (2 flights) via Denver International (DEN), from Seattle-Tacoma (SEA) to Los Angeles International (LAX), first flight Frontier Airlines F93406, departs 4:27 PM, arrives 12:10 AM the next day, total travel time 7h 43m including layovers, flight time 5h 20m (layovers excluded), $143 per person. Fare as listed by Aviasales: carry-on bag not included (personal item only), checked bag not included, changes not allowed, non-refundable. Price found in an Aviasales search on September 5, 2026 and read by AirSource on September 10, 2026, 21:23 UTC: it is not guaranteed and is confirmed on Aviasales at booking time. The cheapest direct flight observed: Frontier Airlines F91178, from Seattle-Tacoma (SEA) to Los Angeles International (LAX), departs 8:15 PM, arrives 11:04 PM, direct, 2h 49m, $164 per person. Fare as listed by Aviasales: carry-on bag not included (personal item only), checked bag not included, changes not allowed, non-refundable.