San Jose (SJC) to Boise (BOI): On-Time Performance
Data through July 2026
When you fly SJC to BOI matters as much as anything else about the booking: the route swung from 96% on-time in February 2026 to just 60% in May 2026. Across the full period the route averages 85% on-time against a national 78%.
- On-time
- 85%
- arrived <15 min late
- Avg delay
- 8 min
- completed flights
- Cancelled
- 0.2%
- Flights/day
- 1.9
- last 12 months
- Duration
- 1h 39m
- scheduled
- Distance
- 523 mi
Best airline from SJC to BOI
2 airlines flew this route regularly between 2024-07 and 2026-07.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| SkyWest Airlinesmost reliable | 85% | 8 min | 0.3% | 672 |
| Southwest Airlines | 84% | 8 min | 0.1% | 742 |
Monthly on-time trend
Best time to fly from SJC to BOI
Aim for departures around 9 a.m. (96% on-time); avoid 3 p.m. departures (65%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 81% | 12 min |
| Tuesdaybest | 95% | 4 min |
| Wednesday | 89% | 4 min |
| Thursday | 78% | 9 min |
| Friday | 81% | 11 min |
| Saturday | 88% | 5 min |
| Sunday | 83% | 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 aircraft69%
- Airline operations16%
- National airspace system11%
- Weather3%
Frequently asked questions
- How often are flights from SJC to BOI delayed?
- 16% of SJC–BOI 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 8 minutes.
- Which airline is most reliable from SJC to BOI?
- SkyWest Airlines has the best on-time record on this route at 85%, based on 672 flights. 2 airlines flew SJC–BOI frequently enough to compare in this period.
- What is the best time of day to fly from SJC to BOI?
- Departures around 9 a.m. have the best record (96% on-time), while departures around 3 p.m. have the worst (65%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from SJC to BOI?
- The scheduled SJC–BOI flight time averages 1h 39m over 523 miles. Actual arrival times vary — flights on this route land 15+ minutes late 16% of the time.
- How often are SJC to BOI flights cancelled?
- 0.2% 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 BOI?
- May 2026 was the roughest month in this dataset, with only 60% of arrivals on time. The best was February 2026 at 96%. If your dates are flexible, that 36-point gap is worth planning around.
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Based on 1,414 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.