San Jose (SJC) to Boise (BOI): On-Time Performance
Data through May 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 86% on-time against a national 78%.
- On-time
- 86%
- arrived <15 min late
- Avg delay
- 8 min
- completed flights
- Cancelled
- 0.1%
- Flights/day
- 1.9
- last 12 months
- Duration
- 1h 38m
- scheduled
- Distance
- 523 mi
Best airline from SJC to BOI
2 airlines flew this route regularly between 2024-06 and 2026-05.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| Southwest Airlinesmost reliable | 87% | 7 min | 0.1% | 713 |
| SkyWest Airlines | 85% | 8 min | 0.2% | 640 |
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 (66%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 84% | 11 min |
| Tuesdaybest | 94% | 4 min |
| Wednesday | 88% | 5 min |
| Thursday | 81% | 8 min |
| Friday | 83% | 10 min |
| Saturday | 88% | 5 min |
| Sunday | 86% | 8 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 operations17%
- National airspace system11%
- Weather4%
- Security1%
Frequently asked questions
- How often are flights from SJC to BOI delayed?
- 14% of SJC–BOI 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 SJC to BOI?
- Southwest Airlines has the best on-time record on this route at 87%, based on 713 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 (66%). 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 38m over 523 miles. Actual arrival times vary — flights on this route land 15+ minutes late 14% of the time.
- How often are SJC to BOI 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 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 1,353 flights, 2024-06–2026-05. Source: US DOT Bureau of Transportation Statistics. Updated 2026-07-01.