Best Time to Fly AUS to SEA: On-Time Stats by Hour & Airline
Austin - Bergstrom International → Seattle/Tacoma International
Data through July 2026 · Last updated October 18, 2026
2,067 flights were scheduled from Austin (AUS) to Seattle (SEA) in the last 12 months, and 82.3% of those that flew arrived on time, 4.7 points above the US average of 77.6%.
Among 3 airlines, Delta Air Lines led with 84.5% on time and Southwest Airlines was last with 50.9%.
Over 24 months, Tuesday was the most reliable day (84% on time) and December the worst month (76%).
The cancellation rate was 0.9% (US average 1.8%).
AUS to SEA on-time performance by airline
Last 12 months. Airlines with fewer than 30 completed flights are marked “limited data”.
| Airline | On time | Avg delay when late | Cancelled | Flights |
|---|---|---|---|---|
| Delta Air Lines | 84.5% | 86 min | 1.1% | 943 |
| Alaska Airlines | 82.0% | 50 min | 0.8% | 1,066 |
| Southwest Airlines | 50.9% | 34 min | 1.7% | 58 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly AUS to SEA
On-time arrival % by scheduled departure hour (local time), 4,171 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 6am–7am | 92.2% | 0.5% | 787 |
| 7am–8am | 83.3% | 1.2% | 407 |
| 8am–9am | 76.8% | 0.7% | 143 |
| 9am–10am | 89.9% | 0.0% | 69 |
| 10am–11am | 87.9% | 0.7% | 141 |
| 11am–12pm | 91.5% | 0.9% | 227 |
| 12pm–1pm | 87.7% | 1.5% | 198 |
| 1pm–2pm | 84.2% | 0.2% | 545 |
| 2pm–3pm | 74.7% | 1.0% | 195 |
| 3pm–4pm | 88.4% | 1.6% | 123 |
| 4pm–5pm | 86.4% | 1.7% | 180 |
| 5pm–6pm | 87.5% | 0.0% | 40 |
| 6pm–7pm | 71.3% | 0.3% | 676 |
| 7pm–8pm | 69.9% | 0.9% | 440 |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on AUS to SEA
On-time arrivals during holiday periods compared with all other days, last 24 months.
| Period | On time | vs other days | Cancelled | Flights |
|---|---|---|---|---|
| Thanksgiving week (Tue before to Mon after) | 74.7% | -9.2 pts | 0.0% | 75 |
| Christmas & New Year (Dec 20 - Jan 3) | 82.2% | -1.7 pts | 0.8% | 130 |
| Summer peak (Jun 15 - Aug 15) | 77.4% | -6.4 pts | 0.6% | 835 |
| All other days | 83.9% | — | 0.8% | 3,131 |
Monthly on-time trend
On-time arrival % each month, with the 12-month US average for reference.
What causes delays on this route
Share of reported delay minutes, last 12 months (BTS cause categories).