San Antonio (SAT) to Seattle (SEA): On-Time Performance
Data through July 2026
San Antonio (SAT) to Seattle (SEA) effectively runs on two schedules. In September 2025, 94% of arrivals were on time; in March 2026 that fell to 55% — a 39-point seasonal swing. Across the full period the route averages 75% on-time against a national 78%. Morning departures also hold up better than evening ones (83% vs 68%), which matters most in the rough months.
- On-time
- 75%
- arrived <15 min late
- Avg delay
- 14 min
- completed flights
- Cancelled
- 0.7%
- Flights/day
- 1.5
- last 12 months
- Duration
- 4h 29m
- scheduled
- Distance
- 1,774 mi
Monthly on-time trend
Best time to fly from SAT to SEA
Aim for departures around 7 a.m. (84% on-time); avoid 7 p.m. departures (62%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 79% | 13 min |
| Tuesday | 74% | 10 min |
| Wednesdaybest | 82% | 8 min |
| Thursday | 70% | 13 min |
| Friday | 79% | 14 min |
| Saturday | 72% | 17 min |
| Sunday | 68% | 19 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft44%
- Airline operations31%
- National airspace system21%
- Weather4%
Frequently asked questions
- How often are flights from SAT to SEA delayed?
- 25% of SAT–SEA 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 14 minutes.
- What is the best time of day to fly from SAT to SEA?
- Departures around 7 a.m. have the best record (84% on-time), while departures around 7 p.m. have the worst (62%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from SAT to SEA?
- The scheduled SAT–SEA flight time averages 4h 29m over 1,774 miles. Actual arrival times vary — flights on this route land 15+ minutes late 25% of the time.
- How often are SAT to SEA flights cancelled?
- 0.7% 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 SEA?
- March 2026 was the roughest month in this dataset, with only 55% of arrivals on time. The best was September 2025 at 94%. If your dates are flexible, that 39-point gap is worth planning around.
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Based on 1,212 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.