Boston (BOS) to San Antonio (SAT): On-Time Performance
Data through May 2026
Boston (BOS) to San Antonio (SAT) 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, 81% arrived on time.
- On-time
- 81%
- arrived <15 min late
- Avg delay
- 16 min
- completed flights
- Cancelled
- 1.6%
- Flights/day
- 0.97
- last 12 months
- Duration
- 4h 41m
- scheduled
- Distance
- 1,764 mi
Best airline from BOS to SAT
2 airlines flew this route regularly between 2024-06 and 2026-05.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| JetBlue Airwaysmost reliable | 85% | 8 min | 2.2% | 137 |
| Delta Air Lines | 80% | 18 min | 1.5% | 532 |
Monthly on-time trend
Best time to fly from BOS to SAT
Aim for departures around 10 a.m. (84% on-time); avoid 9 a.m. departures (79%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 83% | 18 min |
| Tuesday | 81% | 12 min |
| Wednesday | 81% | 15 min |
| Thursday | 81% | 13 min |
| Fridaybest | 85% | 11 min |
| Saturday | 80% | 11 min |
| Sunday | 75% | 28 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft33%
- Airline operations53%
- National airspace system14%
Frequently asked questions
- How often are flights from BOS to SAT delayed?
- 19% of BOS–SAT 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 16 minutes.
- Which airline is most reliable from BOS to SAT?
- JetBlue Airways has the best on-time record on this route at 85%, based on 137 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 (84% on-time), while departures around 9 a.m. have the worst (79%). 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 41m over 1,764 miles. Actual arrival times vary — flights on this route land 15+ minutes late 19% of the time.
- How often are BOS to SAT 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 BOS to SAT?
- May 2025 was the roughest month in this dataset, with only 65% of arrivals on time. The best was March 2026 at 97%. If your dates are flexible, that 32-point gap is worth planning around.
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Based on 669 flights, 2024-06–2026-05. Source: US DOT Bureau of Transportation Statistics. Updated 2026-07-01.