Austin (AUS) to Seattle (SEA): On-Time Performance
Data through May 2026
Austin (AUS) to Seattle (SEA) effectively runs on two schedules. In April 2026, 92% of arrivals were on time; in December 2025 that fell to 70% — a 22-point seasonal swing. Across the full period the route averages 82% on-time against a national 78%. Morning departures also hold up better than evening ones (89% vs 69%), which matters most in the rough months.
- On-time
- 82%
- arrived <15 min late
- Avg delay
- 14 min
- completed flights
- Cancelled
- 0.9%
- Flights/day
- 5.6
- last 12 months
- Duration
- 4h 36m
- scheduled
- Distance
- 1,770 mi
Best airline from AUS to SEA
2 airlines flew this route regularly between 2024-06 and 2026-05.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| Delta Air Linesmost reliable | 84% | 16 min | 1.0% | 1,801 |
| Alaska Airlines | 80% | 12 min | 0.8% | 2,298 |
Monthly on-time trend
Best time to fly from AUS to SEA
Aim for departures around 6 a.m. (92% on-time); avoid 6 p.m. departures (68%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 81% | 16 min |
| Tuesdaybest | 85% | 14 min |
| Wednesday | 84% | 11 min |
| Thursday | 80% | 13 min |
| Friday | 84% | 13 min |
| Saturday | 82% | 13 min |
| Sunday | 79% | 16 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft40%
- Airline operations38%
- National airspace system15%
- Weather6%
- Security1%
Frequently asked questions
- How often are flights from AUS to SEA delayed?
- 18% of AUS–SEA flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-06 and 2026-05. The average arrival delay across completed flights was 14 minutes.
- Which airline is most reliable from AUS to SEA?
- Delta Air Lines has the best on-time record on this route at 84%, based on 1,801 flights. 2 airlines flew AUS–SEA frequently enough to compare in this period.
- What is the best time of day to fly from AUS to SEA?
- Departures around 6 a.m. have the best record (92% on-time), while departures around 6 p.m. have the worst (68%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from AUS to SEA?
- The scheduled AUS–SEA flight time averages 4h 36m over 1,770 miles. Actual arrival times vary — flights on this route land 15+ minutes late 18% of the time.
- How often are AUS to SEA flights cancelled?
- 0.9% of scheduled flights on this route were cancelled between 2024-06 and 2026-05, at or below the national rate of 1.6%.
- What is the worst month to fly from AUS to SEA?
- December 2025 was the roughest month in this dataset, with only 70% of arrivals on time. The best was April 2026 at 92%. If your dates are flexible, that 22-point gap is worth planning around.
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Based on 4,099 flights, 2024-06–2026-05. Source: US DOT Bureau of Transportation Statistics. Updated 2026-07-01.