Best Time to Fly SEA to LAX: On-Time Stats by Hour & Airline
Seattle/Tacoma International → Los Angeles International
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 82.7% of Seattle (SEA) to Los Angeles (LAX) flights arrived on time (7,454 scheduled flights). That is 5.0 points above the national average of 77.6%.
United Airlines was the most punctual of the 5 airlines on the route at 89.8%, while Frontier Airlines trailed at 80.4%.
April has been the best month (89% on time) and Sunday the weakest day of the week (80%).
0.8% of flights were cancelled, versus 1.8% nationally.
SEA to LAX 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 | 89.8% | 81 min | 0.0% | 392 |
| SkyWest Airlines | 85.5% | 124 min | 0.7% | 1,237 |
| Delta Air Lines | 83.1% | 56 min | 0.6% | 2,226 |
| Alaska Airlines | 80.7% | 42 min | 0.9% | 3,289 |
| Frontier Airlines | 80.4% | 59 min | 3.0% | 295 |
| American Airlines | Limited data | 15 | ||
80%+ good 70–79.9% fair <70% poor
Best time of day to fly SEA to LAX
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 | 86.8% | 0.5% | 198 |
| 6am–7am | 88.0% | 0.8% | 1,501 |
| 7am–8am | 89.6% | 0.4% | 1,493 |
| 8am–9am | 88.9% | 1.6% | 689 |
| 9am–10am | 86.3% | 0.3% | 681 |
| 10am–11am | 84.7% | 0.9% | 1,064 |
| 11am–12pm | 79.4% | 1.1% | 792 |
| 12pm–1pm | 86.5% | 0.5% | 870 |
| 1pm–2pm | 82.9% | 0.8% | 512 |
| 2pm–3pm | 83.8% | 0.9% | 1,043 |
| 3pm–4pm | 79.5% | 1.2% | 579 |
| 4pm–5pm | 82.1% | 0.8% | 603 |
| 5pm–6pm | 79.5% | 0.3% | 1,969 |
| 6pm–7pm | 79.5% | 1.3% | 595 |
| 7pm–8pm | 80.1% | 0.8% | 1,212 |
| 8pm–9pm | 76.5% | 0.6% | 544 |
| 9pm–10pm | 71.8% | 0.2% | 625 |
| 10pm–11pm | Limited data | 1 | |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on SEA to LAX
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% | -0.1 pts | 0.7% | 292 |
| Christmas & New Year (Dec 20 - Jan 3) | 68.8% | -16.5 pts | 0.5% | 580 |
| Summer peak (Jun 15 - Aug 15) | 76.5% | -8.8 pts | 0.9% | 2,662 |
| All other days | 85.3% | — | 0.7% | 11,437 |
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).