Seattle (SEA) to Austin (AUS): On-Time Performance
Data through July 2026
The calendar drives reliability on SEA–AUS. April 2026 flights landed on schedule 88% of the time, but July 2025 dropped to 60% — a gap of 27 points. Across the full period the route averages 77% on-time against a national 78%. Morning departures also hold up better than evening ones (81% vs 71%), which matters most in the rough months.
- On-time
- 77%
- arrived <15 min late
- Avg delay
- 14 min
- completed flights
- Cancelled
- 0.6%
- Flights/day
- 5.7
- last 12 months
- Duration
- 4h 11m
- scheduled
- Distance
- 1,770 mi
Best airline from SEA to AUS
2 airlines flew this route regularly between 2024-07 and 2026-07.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| Delta Air Linesmost reliable | 80% | 15 min | 0.8% | 1,901 |
| Alaska Airlines | 75% | 13 min | 0.4% | 2,392 |
Monthly on-time trend
Best time to fly from SEA to AUS
Aim for departures around 8 a.m. (89% on-time); avoid 1 p.m. departures (31%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 72% | 16 min |
| Tuesdaybest | 84% | 8 min |
| Wednesday | 81% | 12 min |
| Thursday | 76% | 13 min |
| Friday | 74% | 17 min |
| Saturday | 77% | 14 min |
| Sunday | 74% | 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 aircraft26%
- Airline operations45%
- National airspace system26%
- Weather2%
Frequently asked questions
- How often are flights from SEA to AUS delayed?
- 23% of SEA–AUS 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.
- Which airline is most reliable from SEA to AUS?
- Delta Air Lines has the best on-time record on this route at 80%, based on 1,901 flights. 2 airlines flew SEA–AUS frequently enough to compare in this period.
- What is the best time of day to fly from SEA to AUS?
- Departures around 8 a.m. have the best record (89% on-time), while departures around 1 p.m. have the worst (31%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from SEA to AUS?
- The scheduled SEA–AUS flight time averages 4h 11m over 1,770 miles. Actual arrival times vary — flights on this route land 15+ minutes late 23% of the time.
- How often are SEA to AUS 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 AUS?
- July 2025 was the roughest month in this dataset, with only 60% of arrivals on time. The best was April 2026 at 88%. If your dates are flexible, that 27-point gap is worth planning around.
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Based on 4,351 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.