Flight Reliability
AS 143 · Alaska Airlines
Anchorage → Seattle (ANC–SEA)99% of its flights flew this route. The rest (SEA–HNL, SLC–ANC) are included in these numbers.
- 68%
- Arrive within 15 minutes
- 11 min
- Average arrival delay
- 0.9%
- Cancelled
- 1 min early
- Median arrival delay
Based on 231 historical flights. Data through May 2026.
What the data says
The late departure is the smart one here.
AS 143 departing between 6–9 PM arrived on time 92% of the time, versus 61% between 3–6 PM.
Saturdays have been rough.
AS 143 arrived on time 79% of the time on Wednesdays and just 54% on Saturdays. That gap is worth planning around.
Well behind the ANC–SEA route.
AS 143 arrived on time 68% of the time, versus 85% across the ANC–SEA route.
Lagging the Alaska Airlines network.
AS 143 arrived on time 68% of the time, versus 80% across the Alaska Airlines network.
The breakdown
- Mon65%(40 flights)
- Tue77%(31 flights)
- Wed79%(29 flights)
- Thu64%(39 flights)
- Fri71%(24 flights)
- Sat54%(26 flights)
- Sun69%(39 flights)
- 3–6 PM61%(168 flights)
- 6–9 PM92%(59 flights)
- 9 PM–12 AM—(1 flights)
Jun 31% → Mar 86% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 31% | 16 |
| July 2025 | 45% | 20 |
| August 2025 | 54% | 24 |
| September 2025 | 65% | 26 |
| October 2025 | 69% | 29 |
| November 2025 | 82% | 22 |
| December 2025 | 67% | 27 |
| January 2026 | 80% | 25 |
| February 2026 | 96% | 24 |
| March 2026 | 86% | 14 |
- Departures on time
- 75%
- Diverted
- 0.4%
- Flights flown
- 228
- Months covered
- 11
Same route, other flights
Keep nerding
Based on 231 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.