Route on-time record
BOS to SAT: most on-time flights and the best time to fly
Boston (Boston Logan International Airport) to San Antonio (San Antonio International Airport). 355 nonstop flights in Jun 2025 to May 2026, 81% arrived within 15 minutes and 2.0% were cancelled. The most reliable flight number was Delta 2652 at 10:45 AM.
Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.
BOS → SAT
Boston to San Antonio: 355 nonstop flights a year
On time (12 months)
81%
Cancelled
2.0%
avg delay 17 min
Best time to leave
Before 9 AM
85% on time vs 80% 9 AM to noon
Most reliable airline
Delta
79% chance on time
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Most reliable nonstop flights
Ranked by the chance the flight operates and arrives within 15 minutes of schedule, from Jun 2025 to May 2026 records.
#1 · Delta 2652
10:45 AM → 2:31 PM4h 42m nonstop
Local times, typical schedule. Last flown 2026-05-31.
79%
chance on time
- On time (history)
- 81%
- Cancelled
- 2.0%
- Avg arrival delay
- 17 min
- Arrived on time 81% of the time (347 flights, Jun 2025 to May 2026).
- Leaves in this route's least on-time window (9 AM to noon: 80% on time; Before 9 AM: 85%).
- Departs outside BOS's trouble window (noon to 6 PM, when 79% of its 196 ground stops and delay programs started).
Strong track record · 347 flights
Find Delta 2652 fares Opens this date on Aviasales
Airlines on this route
Season-adjusted chance of operating and arriving on time.
- Delta Air Lines79%
355 flights · 81% on time as flown · 2.0% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- Before 9 AM85%
34 flights · avg delay 7 min
- 9 AM to noon80%
319 flights · avg delay 19 min
Best day: Monday (83%). Worst: Saturday (74%).
On time by month
All airlines, Jun 2023 to May 2026. Several years per month, so one stormy season doesn't define a month. Travel-month estimates use this seasonal pattern.
What delays this route
- Airline (crew, maintenance, boarding)59%
- Late-arriving aircraft30%
- Air traffic control and airport volume11%
Share of delay minutes by the cause airlines report to the US DOT.
Historical odds, not a guarantee. Built from the US DOT Bureau of Transportation Statistics on-time reports (Jun 2025 to May 2026), FAA ground stop and delay program advisories, and 20 years of airport weather observations. Covers US airlines that report to the DOT; schedules are flights operated recently, so confirm times when you book. ATIS Alerts is not affiliated with any airline. Fares are what Aviasales travelers saw in recent searches (USD, one way, 1 adult), not live quotes; the partner site shows the current price. Fare links go to our travel partner and may earn us a commission at no cost to you. Affiliate disclosure
BOS to SAT questions
- What time of day is best to fly BOS to SAT?
- Before 9 AM: 85% of flights arrived on time, against 80% for departures 9 AM to noon. Later flights inherit delays from earlier ones, so the first departures of the day usually run best.
- Which airline is most on time from BOS to SAT?
- Delta, with a season-adjusted 79% chance of operating and arriving on time over 355 flights. The adjustment compares each airline with what the route did in the months it flew, so a carrier that skipped a stormy month gets no free credit.
- What is the worst month for delays on BOS to SAT?
- May (72% on time); the best was September (83%), averaged over Jun 2023 to May 2026.
- Is this a prediction for my flight?
- No. These are historical odds from the US DOT on-time reports, FAA advisories and airport weather records. Check your flight status and the FAA delay board on the day you fly.
More routes from BOS
- SAT to BOS (return)
- BOS to DCA 74%
- BOS to ORD 72%
- BOS to LGA 77%
- BOS to JFK 75%
- BOS to PHL 76%
- BOS to ATL 78%
- BOS to LAX 76%
- BOS to MCO 70%
- BOS to SFO 75%
- BOS to CLT 82%
- BOS to DEN 76%
- BOS to EWR 74%
Most on-time flights from BOS on every route →
Live status: FAA delays and ground stops