Flight Reliability
AS 134 · Alaska Airlines
Anchorage → Seattle (ANC–SEA)96% of its flights flew this route. The rest (ORD–ANC) are included in these numbers.
- 80%
- Arrive within 15 minutes
- 2 min
- Average arrival delay
- 0.7%
- Cancelled
- 7 min early
- Median arrival delay
Based on 279 historical flights. Data through May 2026.
What the data says
The 3–6 PM departure wins.
AS 134 departing between 3–6 PM arrived on time 82% of the time, versus 27% between 9 AM–12 PM.
Mondays have been rough.
AS 134 arrived on time 88% of the time on Tuesdays and just 67% on Mondays. That gap is worth planning around.
A bit behind the ANC–SEA route.
AS 134 arrived on time 80% of the time, versus 85% across the ANC–SEA route.
Trending in the right direction.
AS 134 arrived on time 87% of the time over the last three months in the data, compared with 76% in the three months before that.
The breakdown
- Mon67%(42 flights)
- Tue88%(43 flights)
- Wed88%(41 flights)
- Thu75%(32 flights)
- Fri78%(41 flights)
- Sat80%(35 flights)
- Sun84%(43 flights)
- 9 AM–12 PM27%(11 flights)
- 3–6 PM82%(266 flights)
Jun 60% → Apr 89% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 60% | 25 |
| July 2025 | 77% | 26 |
| August 2025 | 69% | 29 |
| September 2025 | 87% | 30 |
| October 2025 | 90% | 29 |
| November 2025 | 95% | 19 |
| December 2025 | 50% | 14 |
| January 2026 | 83% | 30 |
| February 2026 | 86% | 28 |
| March 2026 | 86% | 29 |
| April 2026 | 89% | 18 |
- Departures on time
- 79%
- Diverted
- 0%
- Flights flown
- 277
- Months covered
- 11
Same route, other flights
Keep nerding
Based on 279 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.