Seattle (SEA) to San Jose (SJC): On-Time Performance
Data through July 2026
Seattle (SEA) to San Jose (SJC) effectively runs on two schedules. In January 2025, 91% of arrivals were on time; in July 2026 that fell to 70% — a 21-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
- 0.7%
- 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 2024-07 and 2026-07.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| SkyWest Airlinesmost reliable | 86% | 9 min | 0.1% | 3,172 |
| Alaska Airlines | 80% | 10 min | 1.5% | 4,040 |
| Southwest Airlines | 75% | 13 min | 0.3% | 2,144 |
Monthly on-time trend
Best time to fly from SEA to SJC
Aim for departures around 6 a.m. (95% on-time); avoid 9 p.m. departures (64%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 81% | 11 min |
| Tuesdaybest | 86% | 8 min |
| Wednesday | 83% | 9 min |
| Thursday | 79% | 11 min |
| Friday | 77% | 12 min |
| Saturday | 83% | 10 min |
| Sunday | 77% | 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 aircraft38%
- Airline operations41%
- National airspace system12%
- Weather9%
- 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 2024-07 and 2026-07. 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 86%, based on 3,172 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 (95% on-time), while departures around 9 p.m. have the worst (64%). 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?
- 0.7% of scheduled flights on this route were cancelled between 2024-07 and 2026-07, at or below the national rate of 1.6%.
- What is the worst month to fly from SEA to SJC?
- July 2026 was the roughest month in this dataset, with only 70% of arrivals on time. The best was January 2025 at 91%. If your dates are flexible, that 21-point gap is worth planning around.
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Based on 9,361 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.