Seattle (SEA) to San Antonio (SAT): On-Time Performance
Data through July 2026
Seattle (SEA) to San Antonio (SAT) effectively runs on two schedules. In September 2025, 94% of arrivals were on time; in July 2026 that fell to 54% — a 39-point seasonal swing. Across the full period the route averages 75% on-time against a national 78%.
- On-time
- 75%
- arrived <15 min late
- Avg delay
- 12 min
- completed flights
- Cancelled
- 0.6%
- Flights/day
- 1.5
- last 12 months
- Duration
- 4h 4m
- scheduled
- Distance
- 1,774 mi
Monthly on-time trend
Best time to fly from SEA to SAT
Aim for departures around 7 a.m. (91% on-time); avoid 10 p.m. departures (54%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 76% | 13 min |
| Tuesdaybest | 79% | 8 min |
| Wednesdaybest | 79% | 8 min |
| Thursday | 74% | 15 min |
| Friday | 75% | 12 min |
| Saturday | 69% | 16 min |
| Sunday | 71% | 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 aircraft42%
- Airline operations42%
- National airspace system16%
Frequently asked questions
- How often are flights from SEA to SAT delayed?
- 25% of SEA–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 12 minutes.
- What is the best time of day to fly from SEA to SAT?
- Departures around 7 a.m. have the best record (91% on-time), while departures around 10 p.m. have the worst (54%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from SEA to SAT?
- The scheduled SEA–SAT flight time averages 4h 4m over 1,774 miles. Actual arrival times vary — flights on this route land 15+ minutes late 25% of the time.
- How often are SEA 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 SEA to SAT?
- July 2026 was the roughest month in this dataset, with only 54% of arrivals on time. The best was September 2025 at 94%. If your dates are flexible, that 39-point gap is worth planning around.
Explore related pages
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Related guides
Based on 1,212 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.