Flight Reliability
AS 438 · Alaska Airlines
Seattle → Houston (SEA–IAH)
67
Usually Fine
WanderNerd Reliability Score
- 65%
- Arrive within 15 minutes
- 11 min
- Average arrival delay
- 1.1%
- Cancelled
- 5 min
- Median arrival delay
Based on 363 historical flights. Data through May 2026.
What the data says
Morning flights do better here.
AS 438 departing between 9 AM–12 PM arrived on time 67% of the time, versus 45% between 12–3 PM.
Friday is doing you no favors.
AS 438 arrived on time 73% of the time on Mondays and just 56% on Fridays. That gap is worth planning around.
Lagging the SEA–IAH route.
AS 438 arrived on time 65% of the time, versus 79% across the SEA–IAH route.
Lagging the Alaska Airlines network.
AS 438 arrived on time 65% of the time, versus 80% across the Alaska Airlines network.
The breakdown
- Mon73%(51 flights)
- Tue69%(52 flights)
- Wed69%(52 flights)
- Thu62%(50 flights)
- Fri56%(50 flights)
- Sat60%(52 flights)
- Sun69%(51 flights)
- 9 AM–12 PM67%(338 flights)
- 12–3 PM45%(20 flights)
77%
May
Jun 39% → May 77% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 39% | 28 |
| July 2025 | 40% | 30 |
| August 2025 | 57% | 30 |
| September 2025 | 80% | 30 |
| October 2025 | 61% | 31 |
| November 2025 | 62% | 29 |
| December 2025 | 42% | 31 |
| January 2026 | 68% | 31 |
| February 2026 | 85% | 27 |
| March 2026 | 83% | 30 |
| April 2026 | 90% | 30 |
| May 2026 | 77% | 31 |
- Departures on time
- 72%
- Diverted
- 0.3%
- Flights flown
- 358
- Months covered
- 12
Same route, other flights
Keep nerding
Based on 363 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.