Flights Seattle → Los Angeles — September 21, 2026

One way · Economy · 1 adult · price per person

The cheapest itinerary observed for Monday, September 21, 2026 on the Seattle–Los Angeles route: 1 stop itinerary (2 flights) via Las Vegas Harry Reid (LAS), from Seattle-Tacoma (SEA) to Los Angeles International (LAX), first flight Frontier Airlines F94204, departs 9:45 PM, arrives 7:47 AM the next day, total travel time 10h 2m including layovers, flight time 3h 57m (layovers excluded), $145 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, $180 per person. Fare as listed by Aviasales: carry-on bag not included (personal item only), checked bag not included, changes not allowed, non-refundable.