82% of flights from San Jose to Boise arrived on time over the past 12 months. That is better than the typical U.S. route. Most reliable airline: Alaska Airlines (86%). 4% of flights arrived more than an hour late or not at all.
How late?
The on-time rate treats a flight 20 minutes late the same as one 5 hours late. Here's the split for SJC → BOI: when a flight was late, it was under 45 minutes late 60% of the time. About 1 in 25 flights landed an hour or more late, and 1 in 345 three hours or more; 0.3% were cancelled outright.
- On time or early82%
- 15–30 min late6.2%
- 30–60 min late7.1%
- 1–2 hours late2.8%
- 2–3 hours late1.0%
- 3+ hours late0.3%
- Diverted0.1%
- Cancelled0.3%
Share of all 689 scheduled flights, past 12 months, by arrival time against schedule.
By airline
| Airline | Flights | On time | Cancelled | Typical arrival | 1h+ late | Avg when late | Operated by |
|---|---|---|---|---|---|---|---|
| Alaska Airlines | 359 | 86% | 0.6% | −14 min | 3.9% | +54 min | SkyWest 93%, Horizon Air 7% |
| Southwest Airlines | 330 | 78% | 0.0% | −4 min | 4.2% | +46 min | Southwest Airlines |
Airline = the name on the ticket. Regional flights (e.g. "Delta Connection") count under the ticketing airline, and the operator is listed.
Best time of day to fly
On-time rate by scheduled departure hour (local time at SJC). Delays build through the day as late planes knock on, so early flights usually do best.
By airline and hour
| Departs | Alaska Airlines |
|---|---|
| 7 p.m. | 86% |
By month
Each calendar month pooled over 2023–2026. Best: January (92%). Worst: June (77%).
By day of week
| Day | Flights | On time | Cancelled |
|---|---|---|---|
| Monday | 109 | 79% | 0.0% |
| Tuesday | 94 | — | — |
| Wednesday | 92 | — | — |
| Thursday | 105 | 72% | 0.9% |
| Friday | 107 | 77% | 0.9% |
| Saturday | 69 | — | — |
| Sunday | 113 | 81% | 0.0% |
Why flights were late
Share of delay minutes on flights 15+ minutes late, as reported to BTS by the airlines.
Cancellations: airline 1 · weather 1
Month by month
Not enough months with data to draw a trend.
Flight numbers on this route
Regular flights with at least 120 scheduled trips in the past year. Sorted by departure time.
| Flight | Departs | Flights | On time | Cancelled | Typical arrival | Operated by |
|---|---|---|---|---|---|---|
| AS 3413 | 7:22 p.m. | 311 | 85% | 0.6% | −15 min | SkyWest |
Worst days in the past year
| Date | Flights | On time | Cancelled |
|---|---|---|---|
| Jun 18, 2026 | 3 | 33% | 0 |
| Dec 21, 2025 | 3 | 67% | 0 |
| Dec 26, 2025 | 3 | 67% | 0 |
| Nov 30, 2025 | 3 | 67% | 0 |
| Dec 1, 2025 | 3 | 67% | 0 |
Nearby airport alternatives
Other ways to make the same trip, using airports within 60 miles of San Jose or Boise. None has been clearly more reliable than SJC → BOI.
| Route | Flights | On time | Cancelled |
|---|---|---|---|
| SJC → BOI (this route) | 689 | 82% | 0.3% |
| OAK → BOI Oakland to Boise /Gowen | 530 | 83% | 0.0% |
| SFO → BOI San Francisco to Boise /Gowen | 1,823 | 75% | 0.3% |
Questions
How often are flights from SJC to BOI on time?
82% of 689 scheduled flights from San Jose, CA to Boise, ID arrived within 15 minutes of schedule between September 2025 and August 2026. 0.3% were cancelled.
Which airline is most on time from SJC to BOI?
Alaska Airlines: 86% of its 359 flights on the route arrived on time. Southwest Airlines: 78%.
What month has the most delays from SJC to BOI?
June (77% on time). The best month is January (92%), over 2023–2026.
Related
- BOI → SJC (return)
- San Jose (SJC) delays by hour
- Flights into Boise /Gowen (BOI)
- Alaska Airlines on-time record
- Southwest Airlines on-time record
- Connecting off this flight? Check the risk
Domestic flights by the airlines that report to the U.S. DOT, plus their regional partners. "On time" means arriving less than 15 minutes after schedule; cancelled and diverted flights count as not on time. Past performance is a guide, not a forecast. Method.