68% of SEA → AUS flights arrived on time in June-August 2026 (617 flights). The most reliable was DL 739, on time 92% of the time on this route. Morning flights did best (75%), afternoon flights worst (37%). Seattle (SEA): no delay reported. Austin (AUS): major delays, Avg 1 hour and 5 minutes, max 3 hours and 3 minutes.
Best time of day to fly SEA → AUS
| Morning (before noon) | |
| Afternoon (noon-5 PM) | |
| Evening (after 5 PM) |
Flights SEA → AUS, most reliable first
| Flight | Departs | On time on this route | Cancelled |
|---|---|---|---|
| DL 739 Delta | 7:15 AM | 0% | |
| AS 352 Alaska Airlines | 9:00 AM | 1% | |
| AS 604 Alaska Airlines | 11:46 AM | 0% | |
| AS 502 Alaska Airlines | 11:44 AM | 0% | |
| DL 831 Delta | 11:04 AM | 1.1% | |
| AS 372 Alaska Airlines | 6:19 PM | 0% | |
| DL 848 Delta | 5:50 PM | 0% | |
| AS 422 Alaska Airlines | 9:05 AM | 0% | |
| WN 4506 Southwest | 12:35 PM | 1.7% | |
| WN 4956 Southwest | 1:50 PM | 0% |
SEA conditions · AUS conditions · AUS → SEA · Cancellations
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From BTS on-time data, June-August 2026; flights with 20+ trips on this route. On-time rates cover each flight number's whole day, which can include other legs. Departure times are local.