Boston (BOS) to San Diego (SAN): On-Time Performance
Data through July 2026
The calendar drives reliability on BOS–SAN. March 2025 flights landed on schedule 87% of the time, but February 2025 dropped to 61% — a gap of 26 points. Across the full period the route averages 77% on-time against a national 78%. Morning departures also hold up better than evening ones (85% vs 67%), which matters most in the rough months.
- On-time
- 77%
- arrived <15 min late
- Avg delay
- 14 min
- completed flights
- Cancelled
- 1.1%
- Flights/day
- 5.1
- last 12 months
- Duration
- 6h 23m
- scheduled
- Distance
- 2,588 mi
Best airline from BOS to SAN
3 airlines flew this route regularly between 2024-07 and 2026-07.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| JetBlue Airwaysmost reliable | 84% | 11 min | 1.1% | 1,779 |
| Alaska Airlines | 73% | 16 min | 0.9% | 1,016 |
| Delta Air Lines | 69% | 15 min | 1.3% | 759 |
Monthly on-time trend
Best time to fly from BOS to SAN
Aim for departures around 7 a.m. (87% on-time); avoid 6 p.m. departures (58%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Mondaybest | 79% | 15 min |
| Tuesday | 79% | 10 min |
| Wednesday | 78% | 11 min |
| Thursday | 76% | 14 min |
| Friday | 74% | 15 min |
| Saturday | 73% | 15 min |
| Sunday | 78% | 14 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft30%
- Airline operations31%
- National airspace system36%
- Weather3%
Frequently asked questions
- How often are flights from BOS to SAN delayed?
- 23% of BOS–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 14 minutes.
- Which airline is most reliable from BOS to SAN?
- JetBlue Airways has the best on-time record on this route at 84%, based on 1,779 flights. 3 airlines flew BOS–SAN frequently enough to compare in this period.
- What is the best time of day to fly from BOS to SAN?
- Departures around 7 a.m. have the best record (87% on-time), while departures around 6 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 BOS to SAN?
- The scheduled BOS–SAN flight time averages 6h 23m over 2,588 miles. Actual arrival times vary — flights on this route land 15+ minutes late 23% of the time.
- How often are BOS to SAN flights cancelled?
- 1.1% 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 BOS to SAN?
- February 2025 was the roughest month in this dataset, with only 61% of arrivals on time. The best was March 2025 at 87%. If your dates are flexible, that 26-point gap is worth planning around.
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Based on 3,613 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.