Boise (BOI) to San Diego (SAN): On-Time Performance
Data through July 2026
When you fly BOI to SAN matters as much as anything else about the booking: the route swung from 91% on-time in May 2025 to just 67% in October 2024. Across the full period the route averages 81% on-time against a national 78%. Morning departures also hold up better than evening ones (89% vs 72%), which matters most in the rough months.
- On-time
- 81%
- arrived <15 min late
- Avg delay
- 11 min
- completed flights
- Cancelled
- 0.7%
- Flights/day
- 2.8
- last 12 months
- Duration
- 2h 21m
- scheduled
- Distance
- 749 mi
Best airline from BOI to SAN
3 airlines flew this route regularly between 2024-07 and 2026-07.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| Alaska Airlinesmost reliable | 87% | 7 min | 1.0% | 289 |
| SkyWest Airlines | 82% | 10 min | 0.7% | 995 |
| Southwest Airlines | 77% | 13 min | 0.5% | 623 |
Monthly on-time trend
Best time to fly from BOI to SAN
Aim for departures around 8 a.m. (92% on-time); avoid 4 p.m. departures (58%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 81% | 13 min |
| Tuesday | 82% | 9 min |
| Wednesday | 87% | 6 min |
| Thursday | 78% | 13 min |
| Friday | 77% | 14 min |
| Saturdaybest | 89% | 6 min |
| Sunday | 76% | 12 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft37%
- Airline operations29%
- National airspace system32%
- Weather2%
Frequently asked questions
- How often are flights from BOI to SAN delayed?
- 19% of BOI–SAN 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 11 minutes.
- Which airline is most reliable from BOI to SAN?
- Alaska Airlines has the best on-time record on this route at 87%, based on 289 flights. 3 airlines flew BOI–SAN frequently enough to compare in this period.
- What is the best time of day to fly from BOI to SAN?
- Departures around 8 a.m. have the best record (92% on-time), while departures around 4 p.m. have the worst (58%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from BOI to SAN?
- The scheduled BOI–SAN flight time averages 2h 21m over 749 miles. Actual arrival times vary — flights on this route land 15+ minutes late 19% of the time.
- How often are BOI to SAN flights cancelled?
- 0.7% 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 BOI to SAN?
- October 2024 was the roughest month in this dataset, with only 67% of arrivals on time. The best was May 2025 at 91%. If your dates are flexible, that 25-point gap is worth planning around.
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Based on 1,907 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.