Flight Reliability
AS 503 · Alaska Airlines
Austin → Seattle (AUS–SEA)97% of its flights flew this route. The rest (STL–SEA) are included in these numbers.
- 85%
- Arrive within 15 minutes
- 1 min
- Average arrival delay
- 1.2%
- Cancelled
- 8 min early
- Median arrival delay
Based on 343 historical flights. Data through May 2026.
What the data says
The 3–6 PM departure wins.
AS 503 departing between 3–6 PM arrived on time 89% of the time, versus 50% between 6–9 PM.
Sunday scaries are real for this one.
AS 503 arrived on time 90% of the time on Tuesdays. On Sundays: 82%.
A bit ahead of the Alaska Airlines network.
AS 503 arrived on time 85% of the time, versus 80% across the Alaska Airlines network.
Ticking up lately.
AS 503 arrived on time 92% of the time over the last three months in the data, compared with 86% in the three months before that.
The breakdown
- Mon84%(49 flights)
- Tue90%(49 flights)
- Wed85%(48 flights)
- Thu82%(49 flights)
- Fri87%(47 flights)
- Sat85%(48 flights)
- Sun82%(49 flights)
- 9 AM–12 PM—(1 flights)
- 12–3 PM85%(241 flights)
- 3–6 PM89%(87 flights)
- 6–9 PM50%(10 flights)
Jun 69% → May 100% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 69% | 29 |
| July 2025 | 80% | 30 |
| August 2025 | 90% | 31 |
| September 2025 | 83% | 30 |
| October 2025 | 84% | 31 |
| November 2025 | 90% | 30 |
| December 2025 | 74% | 31 |
| January 2026 | 93% | 29 |
| February 2026 | 89% | 28 |
| March 2026 | 79% | 28 |
| April 2026 | 97% | 30 |
| May 2026 | 100% | 12 |
- Departures on time
- 86%
- Diverted
- 0%
- Flights flown
- 339
- Months covered
- 12
Same route, other flights
Keep nerding
Based on 343 historical flights, because apparently we checked. Historical flight data: U.S. Bureau of Transportation Statistics, June 2025 – May 2026. Data through May 2026. How we calculate this.