Flight Reliability
AS 638 · Alaska Airlines
Seattle → Tucson (SEA–TUS)
86
Pretty Reliable
WanderNerd Reliability Score
- 82%
- Arrive within 15 minutes
- 1 min early
- Average arrival delay
- 1.1%
- Cancelled
- 6 min early
- Median arrival delay
Based on 190 historical flights. Data through May 2026.
What the data says
Sunday scaries are real for this one.
AS 638 arrived on time 93% of the time on Thursdays and just 72% on Sundays. That gap is worth planning around.
Trending in the right direction.
AS 638 arrived on time 92% of the time over the last three months in the data, compared with 78% in the three months before that.
The breakdown
- Mon75%(32 flights)
- Tue83%(24 flights)
- Wed80%(25 flights)
- Thu93%(29 flights)
- Fri90%(30 flights)
- Sat81%(16 flights)
- Sun72%(32 flights)
100%
May
Oct 82% → May 100% on time
| Month | On-time percentage | Flights |
|---|---|---|
| October 2025 | 82% | 17 |
| November 2025 | 72% | 29 |
| December 2025 | 65% | 23 |
| January 2026 | 81% | 26 |
| February 2026 | 88% | 24 |
| March 2026 | 79% | 28 |
| April 2026 | 97% | 30 |
| May 2026 | 100% | 11 |
- Departures on time
- 80%
- Diverted
- 0%
- Flights flown
- 188
- Months covered
- 8
Same route, other flights
Keep nerding
Based on 190 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.