Best Time to Fly SEA to AUS: On-Time Stats by Hour & Airline
Seattle/Tacoma International → Austin - Bergstrom International
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 79.2% of Seattle (SEA) to Austin (AUS) flights arrived on time (2,068 scheduled flights). That is 1.6 points above the national average of 77.6%.
Alaska Airlines was the most punctual of the 3 airlines on the route at 80.2%, while Southwest Airlines trailed at 46.5%.
April has been the best month (87% on time) and Monday the weakest day of the week (73%).
0.9% of flights were cancelled, versus 1.8% nationally.
SEA to AUS 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 |
|---|---|---|---|---|
| Alaska Airlines | 80.2% | 45 min | 0.7% | 1,066 |
| Delta Air Lines | 80.2% | 67 min | 1.2% | 944 |
| Southwest Airlines | 46.5% | 55 min | 0.0% | 58 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly SEA to AUS
On-time arrival % by scheduled departure hour (local time), 4,173 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 12am–1am | 81.2% | 0.0% | 64 |
| 7am–8am | 85.1% | 0.5% | 602 |
| 8am–9am | 89.7% | 0.6% | 324 |
| 9am–10am | 80.6% | 1.4% | 519 |
| 10am–11am | 86.9% | 1.0% | 208 |
| 11am–12pm | 75.3% | 0.5% | 744 |
| 12pm–1pm | 73.2% | 0.0% | 326 |
| 1pm–2pm | 31.4% | 0.0% | 35 |
| 3pm–4pm | Limited data | 13 | |
| 5pm–6pm | 71.4% | 0.4% | 996 |
| 6pm–7pm | 77.2% | 0.0% | 136 |
| 10pm–11pm | 87.0% | 0.0% | 92 |
| 11pm–12am | 57.5% | 0.9% | 114 |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on SEA to AUS
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) | 86.7% | +5.5 pts | 0.0% | 75 |
| Christmas & New Year (Dec 20 - Jan 3) | 73.6% | -7.6 pts | 0.8% | 130 |
| Summer peak (Jun 15 - Aug 15) | 63.4% | -17.8 pts | 0.4% | 835 |
| All other days | 81.2% | — | 0.6% | 3,133 |
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).