San Diego (SAN) to Boston (BOS): On-Time Performance
Data through July 2026
When you fly SAN to BOS matters as much as anything else about the booking: the route swung from 90% on-time in May 2026 to just 63% in July 2024. Across the full period the route averages 75% on-time against a national 78%.
- On-time
- 75%
- arrived <15 min late
- Avg delay
- 20 min
- completed flights
- Cancelled
- 1.2%
- Flights/day
- 5.1
- last 12 months
- Duration
- 5h 38m
- scheduled
- Distance
- 2,588 mi
Best airline from SAN to BOS
3 airlines flew this route regularly between 2024-07 and 2026-07.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| Delta Air Linesmost reliable | 79% | 19 min | 1.4% | 759 |
| JetBlue Airways | 76% | 21 min | 1.3% | 1,779 |
| Alaska Airlines | 75% | 17 min | 0.9% | 1,017 |
Monthly on-time trend
Best time to fly from SAN to BOS
Aim for departures around 7 a.m. (86% on-time); avoid 2 p.m. departures (55%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 76% | 21 min |
| Tuesday | 79% | 14 min |
| Wednesdaybest | 79% | 16 min |
| Thursday | 70% | 25 min |
| Friday | 74% | 22 min |
| Saturday | 79% | 16 min |
| Sunday | 71% | 23 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft32%
- Airline operations24%
- National airspace system36%
- Weather8%
Frequently asked questions
- How often are flights from SAN to BOS delayed?
- 25% of SAN–BOS 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 20 minutes.
- Which airline is most reliable from SAN to BOS?
- Delta Air Lines has the best on-time record on this route at 79%, based on 759 flights. 3 airlines flew SAN–BOS frequently enough to compare in this period.
- What is the best time of day to fly from SAN to BOS?
- Departures around 7 a.m. have the best record (86% on-time), while departures around 2 p.m. have the worst (55%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from SAN to BOS?
- The scheduled SAN–BOS flight time averages 5h 38m over 2,588 miles. Actual arrival times vary — flights on this route land 15+ minutes late 25% of the time.
- How often are SAN to BOS flights cancelled?
- 1.2% 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 SAN to BOS?
- July 2024 was the roughest month in this dataset, with only 63% of arrivals on time. The best was May 2026 at 90%. If your dates are flexible, that 27-point gap is worth planning around.
Explore related pages
More routes from SAN
Other ways to fly to Boston (BOS)
Related guides
Based on 3,613 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.