Flight Reliability
AS 78 · Alaska Airlines
Seattle → Anchorage (SEA–ANC)94% of its flights flew this route. The rest (ANC–JNU, BET–ANC) are included in these numbers.
- 71%
- Arrive within 15 minutes
- 9 min
- Average arrival delay
- 0.9%
- Cancelled
- 0 min
- Median arrival delay
Based on 235 historical flights. Data through May 2026.
What the data says
Thursdays have been rough.
AS 78 arrived on time 81% of the time on Sundays and just 59% on Thursdays. That gap is worth planning around.
A bit behind the SEA–ANC route.
AS 78 arrived on time 71% of the time, versus 75% across the SEA–ANC route.
Lagging the Alaska Airlines network.
AS 78 arrived on time 71% of the time, versus 80% across the Alaska Airlines network.
Recent months have been rougher.
AS 78 arrived on time 75% of the time over the last three months in the data, compared with 82% in the three months before that.
The breakdown
- Mon69%(35 flights)
- Tue74%(34 flights)
- Wed73%(30 flights)
- Thu59%(27 flights)
- Fri64%(36 flights)
- Sat74%(35 flights)
- Sun81%(36 flights)
- 9 AM–12 PM—(3 flights)
- 3–6 PM71%(230 flights)
Jun 80% → May 84% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 80% | 30 |
| July 2025 | 59% | 29 |
| August 2025 | 41% | 27 |
| September 2025 | 77% | 22 |
| November 2025 | 90% | 10 |
| January 2026 | 80% | 25 |
| February 2026 | 75% | 28 |
| March 2026 | 65% | 17 |
| May 2026 | 84% | 31 |
- Departures on time
- 70%
- Diverted
- 0%
- Flights flown
- 233
- Months covered
- 12
Same route, other flights
Keep nerding
Based on 235 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.