Best Time to Fly SJC to SEA: On-Time Stats by Hour & Airline
Norman Y. Mineta San Jose International → Seattle/Tacoma International
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 83.4% of San Jose (SJC) to Seattle (SEA) flights arrived on time (4,381 scheduled flights). That is 5.8 points above the national average of 77.6%.
Among 3 airlines, SkyWest Airlines led with 89.1% on time and Southwest Airlines was last with 77.2%.
Over 24 months, Tuesday was the most reliable day (88% on time) and June the worst month (77%).
The cancellation rate was 0.6% (US average 1.8%).
SJC 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 |
|---|---|---|---|---|
| SkyWest Airlines | 89.1% | 66 min | 0.2% | 1,594 |
| Alaska Airlines | 81.5% | 50 min | 1.3% | 1,878 |
| Southwest Airlines | 77.2% | 44 min | 0.0% | 906 |
| American Airlines | Limited data | 2 | ||
| United Airlines | Limited data | 1 | ||
80%+ good 70–79.9% fair <70% poor
Best time of day to fly SJC to SEA
On-time arrival % by scheduled departure hour (local time), 8,929 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 6am–7am | 96.1% | 0.3% | 854 |
| 7am–8am | 92.6% | 0.4% | 792 |
| 8am–9am | 69.8% | 1.9% | 473 |
| 9am–10am | 80.2% | 0.4% | 248 |
| 10am–11am | 88.8% | 2.0% | 610 |
| 11am–12pm | 90.0% | 0.0% | 768 |
| 12pm–1pm | 88.2% | 0.7% | 425 |
| 1pm–2pm | 81.6% | 1.7% | 288 |
| 2pm–3pm | 80.6% | 0.3% | 972 |
| 3pm–4pm | 83.6% | 1.4% | 620 |
| 4pm–5pm | 86.8% | 0.4% | 244 |
| 5pm–6pm | 85.1% | 0.9% | 656 |
| 6pm–7pm | 78.3% | 0.7% | 966 |
| 7pm–8pm | 69.8% | 0.5% | 380 |
| 8pm–9pm | 73.9% | 0.0% | 353 |
| 9pm–10pm | 67.9% | 2.1% | 280 |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on SJC 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) | 84.0% | -1.2 pts | 0.0% | 164 |
| Christmas & New Year (Dec 20 - Jan 3) | 84.6% | -0.7 pts | 1.3% | 304 |
| Summer peak (Jun 15 - Aug 15) | 77.2% | -8.1 pts | 1.1% | 1,711 |
| All other days | 85.3% | — | 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).