San Antonio (SAT) to Boston (BOS): On-Time Performance
Data through May 2026
San Antonio (SAT) to Boston (BOS) is a thinner route than most in this dataset — 355 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
- 32 min
- completed flights
- Cancelled
- 1.6%
- Flights/day
- 0.97
- last 12 months
- Duration
- 4h 8m
- scheduled
- Distance
- 1,764 mi
Best airline from SAT to BOS
2 airlines flew this route regularly between 2024-06 and 2026-05.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| Delta Air Linesmost reliable | 63% | 32 min | 1.7% | 532 |
| JetBlue Airways | 59% | 33 min | 1.5% | 137 |
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 (53%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 62% | 27 min |
| Tuesday | 65% | 23 min |
| Wednesday | 63% | 34 min |
| Thursday | 56% | 33 min |
| Friday | 53% | 30 min |
| Saturdaybest | 71% | 48 min |
| Sunday | 68% | 35 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft23%
- Airline operations32%
- National airspace system39%
- Weather6%
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 2024-06 and 2026-05. The average arrival delay across completed flights was 32 minutes.
- Which airline is most reliable from SAT to BOS?
- Delta Air Lines has the best on-time record on this route at 63%, based on 532 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 (53%). 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 8m 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?
- 1.6% of scheduled flights on this route were cancelled between 2024-06 and 2026-05, at or below 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.
Explore related pages
More routes from SAT
Based on 669 flights, 2024-06–2026-05. Source: US DOT Bureau of Transportation Statistics. Updated 2026-07-01.