Seattle (SEA) to San Jose (SJC): On-Time Performance
Data through May 2026
Seattle (SEA) to San Jose (SJC) effectively runs on two schedules. In January 2025, 91% of arrivals were on time; in July 2025 that fell to 72% — a 18-point seasonal swing. Across the full period the route averages 81% on-time against a national 78%. Morning departures also hold up better than evening ones (86% vs 75%), which matters most in the rough months.
- On-time
- 81%
- arrived <15 min late
- Avg delay
- 10 min
- completed flights
- Cancelled
- 0.8%
- Flights/day
- 12
- last 12 months
- Duration
- 2h 15m
- scheduled
- Distance
- 696 mi
Best airline from SEA to SJC
3 airlines flew this route regularly between 2024-06 and 2026-05.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| SkyWest Airlinesmost reliable | 87% | 9 min | 0.1% | 2,999 |
| Alaska Airlines | 79% | 10 min | 1.6% | 3,847 |
| Southwest Airlines | 77% | 12 min | 0.3% | 2,072 |
Monthly on-time trend
Best time to fly from SEA to SJC
Aim for departures around 6 a.m. (96% on-time); avoid 9 p.m. departures (62%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 82% | 10 min |
| Tuesdaybest | 87% | 8 min |
| Wednesday | 83% | 9 min |
| Thursday | 80% | 10 min |
| Friday | 77% | 12 min |
| Saturday | 83% | 10 min |
| Sunday | 78% | 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 aircraft37%
- Airline operations43%
- National airspace system12%
- Weather8%
- Security1%
Frequently asked questions
- How often are flights from SEA to SJC delayed?
- 19% of SEA–SJC 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 SEA to SJC?
- SkyWest Airlines has the best on-time record on this route at 87%, based on 2,999 flights. 3 airlines flew SEA–SJC frequently enough to compare in this period.
- What is the best time of day to fly from SEA to SJC?
- Departures around 6 a.m. have the best record (96% on-time), while departures around 9 p.m. have the worst (62%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from SEA to SJC?
- The scheduled SEA–SJC flight time averages 2h 15m over 696 miles. Actual arrival times vary — flights on this route land 15+ minutes late 19% of the time.
- How often are SEA to SJC flights cancelled?
- 0.8% 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 SEA to SJC?
- July 2025 was the roughest month in this dataset, with only 72% of arrivals on time. The best was January 2025 at 91%. If your dates are flexible, that 18-point gap is worth planning around.
Explore related pages
More routes from SEA
Based on 8,928 flights, 2024-06–2026-05. Source: US DOT Bureau of Transportation Statistics. Updated 2026-07-01.