Boise (BOI) to San Jose (SJC): On-Time Performance
Data through May 2026
The calendar drives reliability on BOI–SJC. September 2024 flights landed on schedule 97% of the time, but July 2025 dropped to 73% — a gap of 24 points. Across the full period the route averages 87% on-time against a national 78%. Morning departures also hold up better than evening ones (92% vs 72%), which matters most in the rough months.
- On-time
- 87%
- arrived <15 min late
- Avg delay
- 8 min
- completed flights
- Cancelled
- 0.1%
- Flights/day
- 1.8
- last 12 months
- Duration
- 1h 52m
- scheduled
- Distance
- 523 mi
Best airline from BOI to SJC
2 airlines flew this route regularly between 2024-06 and 2026-05.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| SkyWest Airlinesmost reliable | 93% | 5 min | 0.2% | 622 |
| Southwest Airlines | 81% | 10 min | 0.1% | 713 |
Monthly on-time trend
Best time to fly from BOI to SJC
Aim for departures around 8 a.m. (96% on-time); avoid 4 p.m. departures (66%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 80% | 11 min |
| Tuesday | 92% | 3 min |
| Wednesday | 92% | 3 min |
| Thursday | 85% | 9 min |
| Friday | 80% | 10 min |
| Saturdaybest | 93% | 5 min |
| Sunday | 89% | 9 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft57%
- Airline operations36%
- National airspace system6%
- Weather2%
Frequently asked questions
- How often are flights from BOI to SJC delayed?
- 13% of BOI–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 8 minutes.
- Which airline is most reliable from BOI to SJC?
- SkyWest Airlines has the best on-time record on this route at 93%, based on 622 flights. 2 airlines flew BOI–SJC frequently enough to compare in this period.
- What is the best time of day to fly from BOI to SJC?
- Departures around 8 a.m. have the best record (96% on-time), while departures around 4 p.m. have the worst (66%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from BOI to SJC?
- The scheduled BOI–SJC flight time averages 1h 52m over 523 miles. Actual arrival times vary — flights on this route land 15+ minutes late 13% of the time.
- How often are BOI to SJC flights cancelled?
- 0.1% 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 BOI to SJC?
- July 2025 was the roughest month in this dataset, with only 73% of arrivals on time. The best was September 2024 at 97%. If your dates are flexible, that 24-point gap is worth planning around.
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Based on 1,335 flights, 2024-06–2026-05. Source: US DOT Bureau of Transportation Statistics. Updated 2026-07-01.