Boston (BOS) to San Antonio (SAT): On-Time Performance
Data through July 2026
Boston (BOS) to San Antonio (SAT) 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, 79% arrived on time.
- On-time
- 79%
- arrived <15 min late
- Avg delay
- 17 min
- completed flights
- Cancelled
- 1.9%
- Flights/day
- 0.98
- last 12 months
- Duration
- 4h 40m
- scheduled
- Distance
- 1,764 mi
Best airline from BOS to SAT
2 airlines flew this route regularly between 2024-07 and 2026-07.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| JetBlue Airwaysmost reliable | 87% | 6 min | 2.8% | 107 |
| Delta Air Lines | 78% | 19 min | 1.7% | 593 |
Monthly on-time trend
Best time to fly from BOS to SAT
Aim for departures around 10 a.m. (85% on-time); avoid 9 a.m. departures (75%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 81% | 23 min |
| Tuesday | 78% | 16 min |
| Wednesday | 80% | 17 min |
| Thursday | 79% | 14 min |
| Fridaybest | 83% | 12 min |
| Saturday | 77% | 13 min |
| Sunday | 76% | 25 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft31%
- Airline operations51%
- National airspace system18%
Frequently asked questions
- How often are flights from BOS to SAT delayed?
- 21% of BOS–SAT 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 17 minutes.
- Which airline is most reliable from BOS to SAT?
- JetBlue Airways has the best on-time record on this route at 87%, based on 107 flights. 2 airlines flew BOS–SAT frequently enough to compare in this period.
- What is the best time of day to fly from BOS to SAT?
- Departures around 10 a.m. have the best record (85% on-time), while departures around 9 a.m. have the worst (75%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from BOS to SAT?
- The scheduled BOS–SAT flight time averages 4h 40m over 1,764 miles. Actual arrival times vary — flights on this route land 15+ minutes late 21% of the time.
- How often are BOS to SAT 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 BOS to SAT?
- July 2026 was the roughest month in this dataset, with only 55% of arrivals on time. The best was March 2026 at 97%. If your dates are flexible, that 42-point gap is worth planning around.
Explore related pages
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Related guides
Based on 700 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.