Best Time to Fly SEA to SJC: On-Time Stats by Hour & Airline
Seattle/Tacoma International → Norman Y. Mineta San Jose International
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 81.3% of Seattle (SEA) to San Jose (SJC) flights arrived on time (4,384 scheduled flights). That is 3.7 points above the national average of 77.6%.
SkyWest Airlines was the most punctual of the 3 airlines on the route at 86.7%, while Southwest Airlines trailed at 72.1%.
January has been the best month (87% on time) and Sunday the weakest day of the week (77%).
0.6% of flights were cancelled, versus 1.8% nationally.
SEA to SJC 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 |
|---|---|---|---|---|
| SkyWest Airlines | 86.7% | 60 min | 0.2% | 1,593 |
| Alaska Airlines | 81.1% | 44 min | 1.1% | 1,881 |
| Southwest Airlines | 72.1% | 44 min | 0.2% | 905 |
| American Airlines | Limited data | 4 | ||
| United Airlines | Limited data | 1 | ||
80%+ good 70–79.9% fair <70% poor
Best time of day to fly SEA to SJC
On-time arrival % by scheduled departure hour (local time), 8,930 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 6am–7am | 95.0% | 1.4% | 281 |
| 7am–8am | 90.9% | 1.8% | 785 |
| 8am–9am | 90.6% | 0.0% | 725 |
| 9am–10am | 86.7% | 1.8% | 544 |
| 10am–11am | 85.9% | 0.9% | 350 |
| 11am–12pm | 75.2% | 0.3% | 888 |
| 12pm–1pm | 76.4% | 1.3% | 541 |
| 1pm–2pm | 76.8% | 0.0% | 284 |
| 2pm–3pm | 84.3% | 0.8% | 525 |
| 3pm–4pm | 79.0% | 0.6% | 847 |
| 4pm–5pm | 83.0% | 0.5% | 373 |
| 5pm–6pm | 77.0% | 0.3% | 769 |
| 6pm–7pm | 72.8% | 1.2% | 331 |
| 7pm–8pm | 80.2% | 0.5% | 806 |
| 8pm–9pm | 70.5% | 0.3% | 732 |
| 9pm–10pm | 63.3% | 1.3% | 149 |
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 SJC
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) | 83.6% | +0.5 pts | 0.0% | 165 |
| Christmas & New Year (Dec 20 - Jan 3) | 73.7% | -9.5 pts | 1.3% | 304 |
| Summer peak (Jun 15 - Aug 15) | 72.5% | -10.7 pts | 1.1% | 1,711 |
| All other days | 83.2% | — | 0.7% | 6,750 |
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).