Flight Reliability
AS 531 · Alaska Airlines
Portland → Las Vegas (PDX–LAS)95% of its flights flew this route. The rest (PDX–ANC) are included in these numbers.
85
Pretty Reliable
WanderNerd Reliability Score
- 83%
- Arrive within 15 minutes
- 1 min
- Average arrival delay
- 1.0%
- Cancelled
- 6 min early
- Median arrival delay
Based on 204 historical flights. Data through May 2026.
What the data says
Wednesday is the weak spot.
AS 531 arrived on time 89% of the time on Fridays. On Wednesdays: 77%.
Ticking up lately.
AS 531 arrived on time 88% of the time over the last three months in the data, compared with 82% in the three months before that.
The breakdown
- Mon81%(31 flights)
- Tue87%(30 flights)
- Wed77%(30 flights)
- Thu80%(30 flights)
- Fri89%(27 flights)
- Sat86%(22 flights)
- Sun81%(31 flights)
- 3–6 PM83%(198 flights)
- 9 PM–12 AM—(3 flights)
83%
May
Jun 46% → May 83% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 46% | 11 |
| November 2025 | 79% | 29 |
| December 2025 | 77% | 30 |
| January 2026 | 83% | 30 |
| February 2026 | 86% | 28 |
| March 2026 | 96% | 28 |
| April 2026 | 86% | 21 |
| May 2026 | 83% | 18 |
- Departures on time
- 85%
- Diverted
- 0.5%
- Flights flown
- 201
- Months covered
- 9
Same route, other flights
Keep nerding
Based on 204 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.