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Flight Reliability

AS 1254 · Alaska Airlines

Seattle → Ontario (SEA–ONT)

70
Usually Fine
WanderNerd Reliability Score
86%
Arrive within 15 minutes
2 min
Average arrival delay
6.0%
Cancelled
5 min early
Median arrival delay

Based on 133 historical flights. Data through May 2026.

What the data says

Thursdays have been rough.

AS 1254 arrived on time 95% of the time on Wednesdays and just 75% on Thursdays. That gap is worth planning around.

A bit ahead of the SEA–ONT route.

AS 1254 arrived on time 86% of the time, versus 83% across the SEA–ONT route.

A bit ahead of the Alaska Airlines network.

AS 1254 arrived on time 86% of the time, versus 80% across the Alaska Airlines network.

Keep a backup plan handy.

AS 1254 was cancelled 6.0% of the time. Typical for U.S. flights is around 1–2%.

The breakdown

On-time by weekday
  • Mon84%(19 flights)
  • Tue95%(20 flights)
  • Wed95%(21 flights)
  • Thu75%(20 flights)
  • Fri88%(17 flights)
  • Sat82%(11 flights)
  • Sun77%(17 flights)
On-time by departure window
  • 6–9 AM86%(104 flights)
  • 9 AM–12 PM86%(21 flights)
On-time trend by month
88%
Oct

Jun 85% → Oct 88% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202585%26
July 202586%21
August 202576%25
September 202593%29
October 202588%24
Departures on time
86%
Diverted
0%
Flights flown
125
Months covered
5

Same route, other flights

Keep nerding

Based on 133 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.