Flight Reliability
AS 318 · Alaska Airlines
Seattle → Boise (SEA–BOI)89% of its flights flew this route. The rest (SFO–ANC, SEA–AUS) are included in these numbers.
- 79%
- Arrive within 15 minutes
- 3 min
- Average arrival delay
- 0.5%
- Cancelled
- 5 min early
- Median arrival delay
Based on 215 historical flights. Data through May 2026.
What the data says
The 12–3 PM departure wins.
AS 318 departing between 12–3 PM arrived on time 90% of the time, versus 78% between 6–9 PM.
Sunday scaries are real for this one.
AS 318 arrived on time 93% of the time on Tuesdays and just 61% on Sundays. That gap is worth planning around.
A bit behind the SEA–BOI route.
AS 318 arrived on time 79% of the time, versus 85% across the SEA–BOI route.
Ticking up lately.
AS 318 arrived on time 85% of the time over the last three months in the data, compared with 79% in the three months before that.
The breakdown
- Mon77%(30 flights)
- Tue93%(30 flights)
- Wed86%(28 flights)
- Thu82%(27 flights)
- Fri76%(29 flights)
- Sat82%(39 flights)
- Sun61%(31 flights)
- 6–9 AM86%(14 flights)
- 12–3 PM90%(10 flights)
- 6–9 PM78%(190 flights)
Jun 86% → May 100% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 86% | 14 |
| November 2025 | 64% | 25 |
| December 2025 | 68% | 28 |
| January 2026 | 80% | 30 |
| February 2026 | 89% | 28 |
| March 2026 | 71% | 31 |
| April 2026 | 83% | 30 |
| May 2026 | 100% | 12 |
- Departures on time
- 74%
- Diverted
- 0%
- Flights flown
- 214
- Months covered
- 12
Same route, other flights
Keep nerding
Based on 215 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.