Flight Reliability
AS 99 · Alaska Airlines
Seattle → Anchorage (SEA–ANC)
80
Pretty Reliable
WanderNerd Reliability Score
- 76%
- Arrive within 15 minutes
- 7 min
- Average arrival delay
- 1.0%
- Cancelled
- 4 min early
- Median arrival delay
Based on 309 historical flights. Data through May 2026.
What the data says
Sunday scaries are real for this one.
AS 99 arrived on time 85% of the time on Tuesdays and just 67% on Sundays. That gap is worth planning around.
A bit behind the Alaska Airlines network.
AS 99 arrived on time 76% of the time, versus 80% across the Alaska Airlines network.
The breakdown
- Mon78%(45 flights)
- Tue85%(47 flights)
- Wed75%(32 flights)
- Thu77%(48 flights)
- Fri75%(44 flights)
- Sat71%(41 flights)
- Sun67%(49 flights)
78%
May
Jun 79% → May 78% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 79% | 19 |
| July 2025 | 61% | 31 |
| August 2025 | 77% | 31 |
| September 2025 | 70% | 30 |
| October 2025 | 67% | 30 |
| November 2025 | 86% | 29 |
| December 2025 | 67% | 12 |
| January 2026 | 85% | 26 |
| February 2026 | 84% | 25 |
| March 2026 | 67% | 24 |
| April 2026 | 86% | 22 |
| May 2026 | 78% | 27 |
- Departures on time
- 74%
- Diverted
- 0%
- Flights flown
- 306
- Months covered
- 12
Same route, other flights
Keep nerding
Based on 309 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.