Flight Reliability
AS 358 · Alaska Airlines
Portland → Boston (PDX–BOS)
87
Pretty Reliable
WanderNerd Reliability Score
- 84%
- Arrive within 15 minutes
- 1 min early
- Average arrival delay
- 0.9%
- Cancelled
- 3 min early
- Median arrival delay
Based on 349 historical flights. Data through May 2026.
What the data says
Tuesdays have been rough.
AS 358 arrived on time 92% of the time on Sundays and just 77% on Tuesdays. That gap is worth planning around.
A bit ahead of the PDX–BOS route.
AS 358 arrived on time 84% of the time, versus 80% across the PDX–BOS route.
A bit ahead of the Alaska Airlines network.
AS 358 arrived on time 84% of the time, versus 80% across the Alaska Airlines network.
Recent months have been rougher.
AS 358 arrived on time 84% of the time over the last three months in the data, compared with 92% in the three months before that.
The breakdown
- Mon82%(50 flights)
- Tue77%(47 flights)
- Wed85%(52 flights)
- Thu82%(51 flights)
- Fri80%(51 flights)
- Sat86%(42 flights)
- Sun92%(52 flights)
74%
May
Jun 87% → May 74% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 87% | 30 |
| July 2025 | 87% | 31 |
| August 2025 | 84% | 31 |
| September 2025 | 70% | 30 |
| October 2025 | 65% | 31 |
| November 2025 | 89% | 28 |
| December 2025 | 87% | 31 |
| January 2026 | 88% | 25 |
| February 2026 | 100% | 21 |
| March 2026 | 92% | 26 |
| April 2026 | 87% | 30 |
| May 2026 | 74% | 31 |
- Departures on time
- 87%
- Diverted
- 0.3%
- Flights flown
- 345
- Months covered
- 12
Same route, other flights
Keep nerding
Based on 349 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.