Flight Reliability
AS 1421 · Alaska Airlines
Houston → Portland (IAH–PDX)
82
Pretty Reliable
WanderNerd Reliability Score
- 79%
- Arrive within 15 minutes
- 7 min
- Average arrival delay
- 1.1%
- Cancelled
- 5 min early
- Median arrival delay
Based on 352 historical flights. Data through May 2026.
What the data says
The 12–3 PM departure wins.
AS 1421 departing between 12–3 PM arrived on time 91% of the time, versus 78% between 3–6 PM.
Skip Thursday if you can.
AS 1421 arrived on time 83% of the time on Tuesdays. On Thursdays: 74%.
The breakdown
- Mon81%(52 flights)
- Tue83%(52 flights)
- Wed82%(50 flights)
- Thu74%(50 flights)
- Fri80%(50 flights)
- Sat81%(41 flights)
- Sun75%(52 flights)
- 12–3 PM91%(33 flights)
- 3–6 PM78%(293 flights)
- 6–9 PM86%(21 flights)
74%
May
Jun 77% → May 74% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 77% | 30 |
| July 2025 | 87% | 31 |
| August 2025 | 80% | 30 |
| September 2025 | 87% | 30 |
| October 2025 | 76% | 29 |
| November 2025 | 79% | 29 |
| December 2025 | 83% | 30 |
| January 2026 | 85% | 26 |
| February 2026 | 67% | 24 |
| March 2026 | 68% | 28 |
| April 2026 | 86% | 29 |
| May 2026 | 74% | 31 |
- Departures on time
- 77%
- Diverted
- 0.3%
- Flights flown
- 347
- Months covered
- 12
Same route, other flights
Keep nerding
Based on 352 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.