Flight Reliability
AS 1278 · Alaska Airlines
Seattle → Ontario (SEA–ONT)
64
A Little Dicey
WanderNerd Reliability Score
- 73%
- Arrive within 15 minutes
- 12 min
- Average arrival delay
- 4.0%
- Cancelled
- 6 min
- Median arrival delay
Based on 50 historical flights. Data through May 2026.
What the data says
Lagging the SEA–ONT route.
AS 1278 arrived on time 73% of the time, versus 83% across the SEA–ONT route.
Lagging the Alaska Airlines network.
AS 1278 arrived on time 73% of the time, versus 80% across the Alaska Airlines network.
The breakdown
- Mon—(6 flights)
- Tue—(8 flights)
- Wed—(7 flights)
- Thu—(7 flights)
- Fri—(7 flights)
- Sat—(6 flights)
- Sun—(7 flights)
- Departures on time
- 65%
- Diverted
- 0%
- Flights flown
- 48
- Months covered
- 2
Same route, other flights
Keep nerding
Based on 50 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.