San Jose (SJC) to Seattle (SEA): On-Time Performance
Data through July 2026
When you fly SJC to SEA matters as much as anything else about the booking: the route swung from 93% on-time in February 2026 to just 77% in June 2026. Across the full period the route averages 83% on-time against a national 78%. Morning departures also hold up better than evening ones (88% vs 77%), which matters most in the rough months.
- On-time
- 83%
- arrived <15 min late
- Avg delay
- 10 min
- completed flights
- Cancelled
- 0.8%
- Flights/day
- 12
- last 12 months
- Duration
- 2h 18m
- scheduled
- Distance
- 696 mi
Best airline from SJC to SEA
3 airlines flew this route regularly between 2024-07 and 2026-07.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| SkyWest Airlinesmost reliable | 89% | 8 min | 0.1% | 3,174 |
| Alaska Airlines | 82% | 10 min | 1.7% | 4,038 |
| Southwest Airlines | 78% | 12 min | 0.1% | 2,145 |
Monthly on-time trend
Best time to fly from SJC to SEA
Aim for departures around 6 a.m. (96% on-time); avoid 9 p.m. departures (69%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 84% | 10 min |
| Tuesdaybest | 87% | 8 min |
| Wednesday | 86% | 8 min |
| Thursday | 80% | 12 min |
| Friday | 82% | 11 min |
| Saturday | 86% | 9 min |
| Sunday | 80% | 11 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft34%
- Airline operations36%
- National airspace system23%
- Weather7%
Frequently asked questions
- How often are flights from SJC to SEA delayed?
- 17% of SJC–SEA 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 SJC to SEA?
- SkyWest Airlines has the best on-time record on this route at 89%, based on 3,174 flights. 3 airlines flew SJC–SEA frequently enough to compare in this period.
- What is the best time of day to fly from SJC to SEA?
- Departures around 6 a.m. have the best record (96% on-time), while departures around 9 p.m. have the worst (69%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from SJC to SEA?
- The scheduled SJC–SEA flight time averages 2h 18m over 696 miles. Actual arrival times vary — flights on this route land 15+ minutes late 17% of the time.
- How often are SJC to SEA flights cancelled?
- 0.8% 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 SJC to SEA?
- June 2026 was the roughest month in this dataset, with only 77% of arrivals on time. The best was February 2026 at 93%. If your dates are flexible, that 16-point gap is worth planning around.
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Based on 9,360 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.