San Antonio (SAT) to Boston (BOS): On-Time Performance
Data through July 2026
San Antonio (SAT) to Boston (BOS) is a thinner route than most in this dataset — 356 departures over the past year, roughly 7 a week — so treat these numbers as indicative rather than definitive. Of the flights that did operate, 62% arrived on time, noticeably below the national average of 78%.
- On-time
- 62%
- arrived <15 min late
- Avg delay
- 33 min
- completed flights
- Cancelled
- 1.9%
- Flights/day
- 0.98
- last 12 months
- Duration
- 4h 9m
- scheduled
- Distance
- 1,764 mi
Best airline from SAT to BOS
2 airlines flew this route regularly between 2024-07 and 2026-07.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| Delta Air Linesmost reliable | 62% | 33 min | 1.9% | 593 |
| JetBlue Airways | 57% | 36 min | 1.9% | 107 |
Monthly on-time trend
Best time to fly from SAT to BOS
Aim for departures around 12 p.m. (73% on-time); avoid 11 a.m. departures (54%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 62% | 30 min |
| Tuesday | 62% | 26 min |
| Wednesday | 61% | 35 min |
| Thursday | 57% | 33 min |
| Friday | 55% | 30 min |
| Saturdaybest | 69% | 49 min |
| Sunday | 68% | 33 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft29%
- Airline operations29%
- National airspace system37%
- Weather5%
Frequently asked questions
- How often are flights from SAT to BOS delayed?
- 38% of SAT–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 33 minutes.
- Which airline is most reliable from SAT to BOS?
- Delta Air Lines has the best on-time record on this route at 62%, based on 593 flights. 2 airlines flew SAT–BOS frequently enough to compare in this period.
- What is the best time of day to fly from SAT to BOS?
- Departures around 12 p.m. have the best record (73% on-time), while departures around 11 a.m. have the worst (54%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from SAT to BOS?
- The scheduled SAT–BOS flight time averages 4h 9m over 1,764 miles. Actual arrival times vary — flights on this route land 15+ minutes late 38% of the time.
- How often are SAT to BOS flights cancelled?
- 1.9% of scheduled flights on this route were cancelled between 2024-07 and 2026-07, slightly above the national rate of 1.6%.
- What is the worst month to fly from SAT to BOS?
- September 2025 was the roughest month in this dataset, with only 23% of arrivals on time. The best was January 2025 at 85%. If your dates are flexible, that 61-point gap is worth planning around.
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Based on 700 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.