BOS to SAT flight delays & on-time performance
Nonstop flights from Boston Logan International Airport to San Antonio International Airport · 1,764 miles · Aug 2025 – Jul 2026
No FAA-reported ground stops or delays at BOS or SAT right now. Individual flights can still be delayed by the airline; check with your airline for your flight.
Key facts
- Flights from Boston (BOS) to San Antonio (SAT) arrived on time 77% of the time in Aug 2025 – Jul 2026, worse than the 78% national average.
- 2.2% were cancelled, and 11% arrived an hour or more late.
- Delta Air Lines is the only airline reporting nonstop flights on this route.
- Departures scheduled around 10am did best (88% on time); around 9am did worst (73%).
- Monday was the most reliable day to fly (85% on time) and Sunday the least (71%).
- The largest source of delay minutes was airline (crew, maintenance, cleaning, fueling) (52%).
Which airline is most on time from BOS to SAT?
Ranked by on-time arrival rate. Regional airlines fly under their partner's brand (e.g. SkyWest for Delta Connection or United Express).
| Airline | On time | Cancelled | Avg delay | 1 hr+ late | Flights |
|---|---|---|---|---|---|
| Delta Air Lines | 77% | 2.2% | 20 min | 10.9% | 356 |
Best time of day to fly
On-time arrival rate by scheduled departure hour (local time).
- 7am86%14 flights
- 8am88%25 flights
- 9am73%208 flights
- 10am88%51 flights
- 11am75%56 flights
Best day of the week
On-time arrival rate by day of departure.
- Monday85%9.6% cancelled
- Tuesday71%0.0% cancelled
- Wednesday80%1.9% cancelled
- Thursday75%2.0% cancelled
- Friday78%2.0% cancelled
- Saturday80%0.0% cancelled
- Sunday71%0.0% cancelled
On-time trend by month
Why flights are late
Share of delay minutes by cause, as reported by airlines to the DOT.
- Airline (crew, maintenance, cleaning, fueling)52%
- Late-arriving aircraft28%
- Air traffic control & airport congestion19%
- Extreme weather0%
- Security0%
Why flights are cancelled
Share of cancellations by reason.
- Airline (crew, maintenance, cleaning, fueling)63%
- Extreme weather38%
- Air traffic control & airport congestion0%
- Security0%
BOS to SAT: common questions
- How often are BOS to SAT flights on time?
- 77% of flights arrived less than 15 minutes late in Aug 2025 – Jul 2026, compared with 78% for all US flights.
- How often are flights from Boston to San Antonio cancelled?
- 2.2% of scheduled flights were cancelled (8 of 356).
- How long are typical delays?
- Across all flights the average arrival delay was 20 min (early arrivals count as zero). Flights that were late arrived 85 min behind schedule on average, and 10.9% of flights were an hour or more late.
- How long is taxi time at BOS?
- Flights on this route spent 22 min taxiing from the gate to takeoff on average.
Related routes
Return trip: SAT to BOS — 60% on time
More flights from Boston
Data: U.S. DOT Bureau of Transportation Statistics, Aug 2025 – Jul 2026 (12 months). Latest month published by BTS: July 2026. Route: BOS → SAT, nonstop flights by US airlines that report to the DOT. How we calculate this.