Flight Reliability
AS 251 · Alaska Airlines
Spokane → Portland (GEG–PDX)
85
Pretty Reliable
WanderNerd Reliability Score
- 87%
- Arrive within 15 minutes
- 1 min
- Average arrival delay
- 2.5%
- Cancelled
- 4 min early
- Median arrival delay
Based on 157 historical flights. Data through May 2026.
What the data says
Mondays have been rough.
AS 251 arrived on time 100% of the time on Tuesdays and just 81% on Mondays. That gap is worth planning around.
A bit ahead of the Alaska Airlines network.
AS 251 arrived on time 87% of the time, versus 80% across the Alaska Airlines network.
Slipping a little lately.
AS 251 arrived on time 84% of the time over the last three months in the data, compared with 90% in the three months before that.
The breakdown
- Mon81%(26 flights)
- Tue100%(18 flights)
- Wed90%(19 flights)
- Thu83%(24 flights)
- Fri84%(25 flights)
- Sat86%(21 flights)
- Sun90%(20 flights)
81%
May
Nov 100% → May 81% on time
| Month | On-time percentage | Flights |
|---|---|---|
| November 2025 | 100% | 24 |
| December 2025 | 76% | 21 |
| January 2026 | 93% | 27 |
| February 2026 | 87% | 23 |
| March 2026 | 83% | 12 |
| May 2026 | 81% | 31 |
- Departures on time
- 83%
- Diverted
- 0%
- Flights flown
- 153
- Months covered
- 8
Same route, other flights
Keep nerding
Based on 157 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.