SAT to BOS flight delays & on-time performance
Nonstop flights from San Antonio International Airport to Boston Logan International Airport · 1,764 miles · Aug 2025 – Jul 2026
No FAA-reported ground stops or delays at SAT or BOS right now. Individual flights can still be delayed by the airline; check with your airline for your flight.
Key facts
- Flights from San Antonio (SAT) to Boston (BOS) arrived on time 60% of the time in Aug 2025 – Jul 2026, worse than the 78% national average.
- 2.2% were cancelled, and 20% arrived an hour or more late.
- Delta Air Lines is the only airline reporting nonstop flights on this route.
- Departures scheduled around 12pm did best (71% on time); around 1pm did worst (55%).
- Saturday was the most reliable day to fly (71% on time) and Friday the least (50%).
- The largest source of delay minutes was late-arriving aircraft (41%).
Which airline is most on time from SAT to BOS?
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 | 60% | 2.2% | 33 min | 20.1% | 356 |
Best time of day to fly
On-time arrival rate by scheduled departure hour (local time).
- 12pm71%100 flights
- 1pm55%133 flights
- 2pm57%109 flights
- 3pm80%11 flights
Best day of the week
On-time arrival rate by day of departure.
- Monday67%5.8% cancelled
- Tuesday53%0.0% cancelled
- Wednesday53%1.9% cancelled
- Thursday63%4.1% cancelled
- Friday50%0.0% cancelled
- Saturday71%0.0% cancelled
- Sunday67%3.9% cancelled
On-time trend by month
Why flights are late
Share of delay minutes by cause, as reported by airlines to the DOT.
- Late-arriving aircraft41%
- Air traffic control & airport congestion39%
- Airline (crew, maintenance, cleaning, fueling)17%
- Extreme weather3%
- Security0%
Why flights are cancelled
Share of cancellations by reason.
- Airline (crew, maintenance, cleaning, fueling)63%
- Extreme weather38%
- Air traffic control & airport congestion0%
- Security0%
SAT to BOS: common questions
- How often are SAT to BOS flights on time?
- 60% 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 San Antonio to Boston cancelled?
- 2.2% of scheduled flights were cancelled (8 of 356).
- How long are typical delays?
- Across all flights the average arrival delay was 33 min (early arrivals count as zero). Flights that were late arrived 81 min behind schedule on average, and 20.1% of flights were an hour or more late.
- How long is taxi time at SAT?
- Flights on this route spent 18 min taxiing from the gate to takeoff on average.
Related routes
Return trip: BOS to SAT — 77% on time
More flights from San Antonio
Data: U.S. DOT Bureau of Transportation Statistics, Aug 2025 – Jul 2026 (12 months). Latest month published by BTS: July 2026. Route: SAT → BOS, nonstop flights by US airlines that report to the DOT. How we calculate this.