Los Angeles (LAX) to Seattle (SEA): On-Time Performance
Data through May 2026
When you fly LAX to SEA matters as much as anything else about the booking: the route swung from 93% on-time in September 2025 to just 77% in June 2025. Across the full period the route averages 85% on-time against a national 78%.
- On-time
- 85%
- arrived <15 min late
- Avg delay
- 10 min
- completed flights
- Cancelled
- 0.9%
- Flights/day
- 20
- last 12 months
- Duration
- 2h 55m
- scheduled
- Distance
- 954 mi
Best airline from LAX to SEA
6 airlines flew this route regularly between 2024-06 and 2026-05.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| Delta Air Linesmost reliable | 88% | 9 min | 0.6% | 4,410 |
| Spirit Airlines | 86% | 12 min | 0.4% | 274 |
| Alaska Airlines | 84% | 9 min | 1.1% | 6,747 |
| United Airlines | 84% | 9 min | 0.6% | 1,072 |
| SkyWest Airlines | 83% | 14 min | 0.5% | 2,074 |
| Frontier Airlines | 82% | 15 min | 2.9% | 413 |
Monthly on-time trend
Best time to fly from LAX to SEA
Aim for departures around 6 a.m. (94% on-time); avoid 9 p.m. departures (78%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 86% | 10 min |
| Tuesdaybest | 88% | 8 min |
| Wednesday | 87% | 7 min |
| Thursday | 85% | 10 min |
| Friday | 81% | 12 min |
| Saturday | 86% | 10 min |
| Sunday | 83% | 12 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft35%
- Airline operations47%
- National airspace system16%
- Weather2%
Frequently asked questions
- How often are flights from LAX to SEA delayed?
- 15% of LAX–SEA flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-06 and 2026-05. The average arrival delay across completed flights was 10 minutes.
- Which airline is most reliable from LAX to SEA?
- Delta Air Lines has the best on-time record on this route at 88%, based on 4,410 flights. 6 airlines flew LAX–SEA frequently enough to compare in this period.
- What is the best time of day to fly from LAX to SEA?
- Departures around 6 a.m. have the best record (94% on-time), while departures around 9 p.m. have the worst (78%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from LAX to SEA?
- The scheduled LAX–SEA flight time averages 2h 55m over 954 miles. Actual arrival times vary — flights on this route land 15+ minutes late 15% of the time.
- How often are LAX to SEA flights cancelled?
- 0.9% of scheduled flights on this route were cancelled between 2024-06 and 2026-05, at or below the national rate of 1.6%.
- What is the worst month to fly from LAX to SEA?
- June 2025 was the roughest month in this dataset, with only 77% of arrivals on time. The best was September 2025 at 93%. If your dates are flexible, that 15-point gap is worth planning around.
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Based on 14,991 flights, 2024-06–2026-05. Source: US DOT Bureau of Transportation Statistics. Updated 2026-07-01.