Route on-time record
SAT to BOS: most on-time flights and the best time to fly
San Antonio (San Antonio International Airport) to Boston (Boston Logan International Airport). 355 nonstop flights in Jun 2025 to May 2026, 60% arrived within 15 minutes and 2.0% were cancelled. The most reliable flight number was Delta 2645 at 1:06 PM.
Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.
SAT → BOS
San Antonio to Boston: 355 nonstop flights a year
On time (12 months)
60%
Cancelled
2.0%
avg delay 32 min
Best time to leave
No clear winner
Most reliable airline
Delta
59% chance on time
Fares open on our travel partner (Aviasales). Pick the flight number you chose here.
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 2645
1:06 PM → 6:25 PM4h 19m nonstop
Local times, typical schedule. Last flown 2026-05-31.
62%
chance on time
- On time (history)
- 74%
- Cancelled
- 4.0%
- Avg arrival delay
- 11 min
- Arrived on time 74% of the time (23 flights, Jun 2025 to May 2026).
Limited track record · 23 flights
Find Delta 2645 fares Opens this date on Aviasales
Airlines on this route
Season-adjusted chance of operating and arriving on time.
- Delta Air Lines59%
355 flights · 60% on time as flown · 2.0% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- Noon to 3 PM60%
341 flights · avg delay 33 min
Best day: Sunday (69%). Worst: Friday (58%).
Smarter routing
Or connect through a calmer hub
via DTW (Detroit Metropolitan Wayne County Airport)
65% both legs on time- SAT to DTW on time 90%, DTW to BOS on time 74%.
- DTW had 28 ground stops and delay programs in 12 months.
via MSP (Minneapolis–Saint Paul International Airport / Wold–Chamberlain Field)
64% both legs on time- SAT to MSP on time 84%, MSP to BOS on time 78%.
- MSP had 17 ground stops and delay programs in 12 months.
Book connections on one ticket and allow at least an hour at the hub. Leg odds are combined as independent, a rough guide.
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
- Air traffic control and airport volume51%
- Late-arriving aircraft30%
- Airline (crew, maintenance, boarding)16%
- Severe weather3%
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
SAT to BOS questions
- Which airline is most on time from SAT to BOS?
- Delta, with a season-adjusted 59% 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 SAT to BOS?
- September (39% on time); the best was January (82%), 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 SAT
- BOS to SAT (return)
- SAT to DFW 77%
- SAT to ATL 85%
- SAT to DEN 81%
- SAT to DAL 84%
- SAT to PHX 83%
- SAT to IAH 81%
- SAT to LAS 83%
- SAT to ORD 76%
- SAT to LAX 87%
- SAT to HOU 74%
- SAT to CLT 86%
- SAT to MCO 77%
Most on-time flights from SAT on every route →
Live status: FAA delays and ground stops