San Antonio (SAT) to Washington (IAD): On-Time Performance
Data through July 2026
San Antonio (SAT) to Washington (IAD) effectively runs on two schedules. In August 2025, 98% of arrivals were on time; in January 2025 that fell to 78% — a 20-point seasonal swing. Across the full period the route averages 91% on-time against a national 78%.
- On-time
- 91%
- arrived <15 min late
- Avg delay
- 8 min
- completed flights
- Cancelled
- 0.6%
- Flights/day
- 1.8
- last 12 months
- Duration
- 3h 18m
- scheduled
- Distance
- 1,362 mi
Monthly on-time trend
Best time to fly from SAT to IAD
Aim for departures around 7 a.m. (94% on-time); avoid 11 a.m. departures (83%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 89% | 9 min |
| Tuesday | 91% | 10 min |
| Wednesday | 92% | 8 min |
| Thursday | 89% | 7 min |
| Friday | 90% | 9 min |
| Saturdaybest | 94% | 5 min |
| Sunday | 90% | 10 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft38%
- Airline operations44%
- National airspace system16%
- Weather3%
Frequently asked questions
- How often are flights from SAT to IAD delayed?
- 9% of SAT–IAD 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 8 minutes.
- What is the best time of day to fly from SAT to IAD?
- Departures around 7 a.m. have the best record (94% on-time), while departures around 11 a.m. have the worst (83%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from SAT to IAD?
- The scheduled SAT–IAD flight time averages 3h 18m over 1,362 miles. Actual arrival times vary — flights on this route land 15+ minutes late 9% of the time.
- How often are SAT to IAD 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 SAT to IAD?
- January 2025 was the roughest month in this dataset, with only 78% of arrivals on time. The best was August 2025 at 98%. If your dates are flexible, that 20-point gap is worth planning around.
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Based on 1,336 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.