Washington (IAD) to San Antonio (SAT): On-Time Performance
Data through July 2026
The calendar drives reliability on IAD–SAT. October 2025 flights landed on schedule 98% of the time, but July 2025 dropped to 69% — a gap of 29 points. Across the full period the route averages 83% on-time against a national 78%. Morning departures also hold up better than evening ones (93% vs 76%), which matters most in the rough months.
- On-time
- 83%
- arrived <15 min late
- Avg delay
- 16 min
- completed flights
- Cancelled
- 0.6%
- Flights/day
- 1.8
- last 12 months
- Duration
- 3h 44m
- scheduled
- Distance
- 1,362 mi
Monthly on-time trend
Best time to fly from IAD to SAT
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Mondaybest | 89% | 8 min |
| Tuesday | 87% | 16 min |
| Wednesday | 84% | 12 min |
| Thursday | 82% | 19 min |
| Friday | 83% | 16 min |
| Saturday | 75% | 31 min |
| Sunday | 79% | 17 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 operations35%
- National airspace system18%
- Weather14%
Frequently asked questions
- How often are flights from IAD to SAT delayed?
- 17% of IAD–SAT flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-07 and 2026-07. The average arrival delay across completed flights was 16 minutes.
- How long is the flight from IAD to SAT?
- The scheduled IAD–SAT flight time averages 3h 44m over 1,362 miles. Actual arrival times vary — flights on this route land 15+ minutes late 17% of the time.
- How often are IAD to SAT flights cancelled?
- 0.6% of scheduled flights on this route were cancelled between 2024-07 and 2026-07, at or below the national rate of 1.6%.
- What is the worst month to fly from IAD to SAT?
- July 2025 was the roughest month in this dataset, with only 69% of arrivals on time. The best was October 2025 at 98%. If your dates are flexible, that 29-point gap is worth planning around.
Explore related pages
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Related guides
Based on 1,336 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.