Best Time to Fly BOI to SAN: On-Time Stats by Hour & Airline
Boise Air Terminal → San Diego International
Data through July 2026 · Last updated October 18, 2026
1,028 flights were scheduled from Boise (BOI) to San Diego (SAN) in the last 12 months, and 80.8% of those that flew arrived on time, 3.1 points above the US average of 77.6%.
Alaska Airlines was the most punctual of the 3 airlines on the route at 89.2%, while Southwest Airlines trailed at 75.0%.
April has been the best month (89% on time) and Sunday the weakest day of the week (77%).
0.6% of flights were cancelled, versus 1.8% nationally.
BOI to SAN on-time performance by airline
Last 12 months. Airlines with fewer than 30 completed flights are marked “limited data”.
| Airline | On time | Avg delay when late | Cancelled | Flights |
|---|---|---|---|---|
| Alaska Airlines | 89.2% | 34 min | 1.1% | 263 |
| SkyWest Airlines | 80.8% | 57 min | 0.5% | 374 |
| Southwest Airlines | 75.0% | 48 min | 0.3% | 391 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly BOI to SAN
On-time arrival % by scheduled departure hour (local time), 1,841 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 6am–7am | 92.2% | 0.0% | 77 |
| 7am–8am | 87.7% | 1.0% | 313 |
| 8am–9am | 92.4% | 1.0% | 294 |
| 9am–10am | 82.0% | 0.0% | 139 |
| 10am–11am | Limited data | 3 | |
| 11am–12pm | Limited data | 10 | |
| 12pm–1pm | 83.7% | 1.5% | 137 |
| 1pm–2pm | 79.7% | 0.0% | 177 |
| 2pm–3pm | 78.6% | 1.2% | 85 |
| 3pm–4pm | 79.1% | 0.0% | 43 |
| 4pm–5pm | 60.0% | 0.0% | 31 |
| 5pm–6pm | 62.5% | 2.9% | 34 |
| 6pm–7pm | 61.2% | 0.0% | 67 |
| 7pm–8pm | 77.2% | 0.6% | 350 |
| 8pm–9pm | 74.1% | 1.8% | 55 |
| 9pm–10pm | Limited data | 26 | |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on BOI to SAN
On-time arrivals during holiday periods compared with all other days, last 24 months.
| Period | On time | vs other days | Cancelled | Flights |
|---|---|---|---|---|
| Thanksgiving week (Tue before to Mon after) | 81.6% | -2.2 pts | 0.0% | 38 |
| Christmas & New Year (Dec 20 - Jan 3) | 63.1% | -20.6 pts | 3.4% | 88 |
| Summer peak (Jun 15 - Aug 15) | 77.7% | -6.1 pts | 0.0% | 336 |
| All other days | 83.8% | — | 0.7% | 1,379 |
Monthly on-time trend
On-time arrival % each month, with the 12-month US average for reference.
What causes delays on this route
Share of reported delay minutes, last 12 months (BTS cause categories).