Best Time to Fly LAX to SEA: On-Time Stats by Hour & Airline
Los Angeles International → Seattle/Tacoma International
Data through July 2026 · Last updated October 18, 2026
7,450 flights were scheduled from Los Angeles (LAX) to Seattle (SEA) in the last 12 months, and 85.3% of those that flew arrived on time, 7.7 points above the US average of 77.6%.
United Airlines was the most punctual of the 5 airlines on the route at 87.0%, while Frontier Airlines trailed at 81.8%.
November has been the best month (90% on time) and Friday the weakest day of the week (81%).
0.9% of flights were cancelled, versus 1.8% nationally.
LAX to SEA on-time performance by airline
Last 12 months. Airlines with fewer than 30 completed flights are marked “limited data”.
| Airline | On time | Avg delay when late | Cancelled | Flights |
|---|---|---|---|---|
| United Airlines | 87.0% | 45 min | 0.2% | 394 |
| Delta Air Lines | 86.4% | 73 min | 0.7% | 2,225 |
| Alaska Airlines | 85.3% | 50 min | 0.9% | 3,287 |
| SkyWest Airlines | 84.0% | 79 min | 0.7% | 1,234 |
| Frontier Airlines | 81.8% | 77 min | 3.4% | 295 |
| American Airlines | Limited data | 15 | ||
80%+ good 70–79.9% fair <70% poor
Best time of day to fly LAX to SEA
On-time arrival % by scheduled departure hour (local time), 14,971 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 5am–6am | Limited data | 1 | |
| 6am–7am | 92.8% | 2.7% | 372 |
| 7am–8am | 91.2% | 1.0% | 1,310 |
| 8am–9am | 84.3% | 1.2% | 776 |
| 9am–10am | 89.9% | 0.8% | 1,258 |
| 10am–11am | 85.5% | 1.7% | 595 |
| 11am–12pm | 85.4% | 0.7% | 1,425 |
| 12pm–1pm | 80.0% | 1.0% | 410 |
| 1pm–2pm | 86.1% | 0.6% | 848 |
| 2pm–3pm | 85.7% | 0.7% | 918 |
| 3pm–4pm | 82.5% | 0.8% | 1,097 |
| 4pm–5pm | 85.5% | 1.5% | 650 |
| 5pm–6pm | 86.0% | 0.5% | 1,404 |
| 6pm–7pm | 79.0% | 0.3% | 754 |
| 7pm–8pm | 81.3% | 0.4% | 1,865 |
| 8pm–9pm | 84.8% | 1.0% | 610 |
| 9pm–10pm | 79.7% | 0.8% | 671 |
| 10pm–11pm | Limited data | 7 | |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on LAX to SEA
On-time arrivals during holiday periods compared with all other days, last 24 months.
| Period | On time | vs other days | Cancelled | Flights |
|---|---|---|---|---|
| Thanksgiving week (Tue before to Mon after) | 85.2% | -1.5 pts | 0.3% | 291 |
| Christmas & New Year (Dec 20 - Jan 3) | 81.4% | -5.2 pts | 1.0% | 578 |
| Summer peak (Jun 15 - Aug 15) | 79.1% | -7.5 pts | 0.9% | 2,661 |
| All other days | 86.6% | — | 0.8% | 11,441 |
Monthly on-time trend
On-time arrival % each month, with the 12-month US average for reference.
What causes delays on this route
Share of reported delay minutes, last 12 months (BTS cause categories).