Best Time to Fly BOS to SAN: On-Time Stats by Hour & Airline
Logan International → San Diego International
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 76.7% of Boston (BOS) to San Diego (SAN) flights arrived on time (1,849 scheduled flights). That is 0.9 points below the national average of 77.6%.
Among 4 airlines, JetBlue led with 84.4% on time and Southwest Airlines was last with 42.9%.
Over 24 months, Monday was the most reliable day (80% on time) and February the worst month (68%).
The cancellation rate was 1.6% (US average 1.8%).
BOS 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 |
|---|---|---|---|---|
| JetBlue | 84.4% | 65 min | 1.7% | 919 |
| Alaska Airlines | 73.1% | 66 min | 1.2% | 508 |
| Delta Air Lines | 67.6% | 42 min | 1.6% | 364 |
| Southwest Airlines | 42.9% | 70 min | 3.5% | 58 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly BOS to SAN
On-time arrival % by scheduled departure hour (local time), 3,458 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 6am–7am | 87.2% | 0.9% | 325 |
| 7am–8am | 89.2% | 1.1% | 262 |
| 8am–9am | 80.6% | 2.5% | 322 |
| 9am–10am | 86.5% | 0.4% | 233 |
| 10am–11am | 87.1% | 1.3% | 157 |
| 11am–12pm | Limited data | 11 | |
| 3pm–4pm | 80.2% | 0.6% | 317 |
| 4pm–5pm | 75.4% | 1.0% | 870 |
| 5pm–6pm | 68.0% | 1.0% | 920 |
| 6pm–7pm | 57.5% | 2.4% | 41 |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on BOS 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) | 82.1% | +3.0 pts | 0.0% | 56 |
| Christmas & New Year (Dec 20 - Jan 3) | 69.2% | -9.9 pts | 2.4% | 126 |
| Summer peak (Jun 15 - Aug 15) | 73.8% | -5.3 pts | 1.6% | 760 |
| All other days | 79.1% | — | 0.9% | 2,516 |
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).