Flight Reliability
AS 3291 · Alaska Airlines
Portland → Salt Lake City (PDX–SLC)92% of its flights flew this route. The rest (PHX–SFO, BOI–PDX) are included in these numbers.
- 79%
- Arrive within 15 minutes
- 8 min
- Average arrival delay
- 0.5%
- Cancelled
- 3 min early
- Median arrival delay
Based on 219 historical flights. Data through May 2026.
What the data says
The 12–3 PM departure wins.
AS 3291 departing between 12–3 PM arrived on time 95% of the time, versus 76% between 3–6 PM.
Thursdays have been rough.
AS 3291 arrived on time 91% of the time on Wednesdays and just 69% on Thursdays. That gap is worth planning around.
Lagging the PDX–SLC route.
AS 3291 arrived on time 79% of the time, versus 89% across the PDX–SLC route.
Ticking up lately.
AS 3291 arrived on time 90% of the time over the last three months in the data, compared with 84% in the three months before that.
The breakdown
- Mon87%(30 flights)
- Tue71%(34 flights)
- Wed91%(34 flights)
- Thu69%(29 flights)
- Fri83%(30 flights)
- Sat80%(30 flights)
- Sun74%(31 flights)
- 12–3 PM95%(37 flights)
- 3–6 PM76%(180 flights)
- 6–9 PM—(1 flights)
Jun 60% → May 79% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 60% | 30 |
| July 2025 | 60% | 30 |
| August 2025 | 74% | 31 |
| September 2025 | 93% | 30 |
| October 2025 | 85% | 26 |
| November 2025 | 100% | 14 |
| December 2025 | 90% | 31 |
| May 2026 | 79% | 19 |
- Departures on time
- 84%
- Diverted
- 0%
- Flights flown
- 218
- Months covered
- 10
Same route, other flights
Keep nerding
Based on 219 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.