Flight Reliability
AS 1119 · Alaska Airlines
Ontario → Seattle (ONT–SEA)99% of its flights flew this route. The rest (ITO–HNL) are included in these numbers.
91
Nerd Approved
WanderNerd Reliability Score
- 89%
- Arrive within 15 minutes
- 2 min early
- Average arrival delay
- 1.6%
- Cancelled
- 5 min early
- Median arrival delay
Based on 125 historical flights. Data through May 2026.
What the data says
Thursdays have been rough.
AS 1119 arrived on time 95% of the time on Wednesdays and just 78% on Thursdays. That gap is worth planning around.
Better than the Alaska Airlines network average.
AS 1119 arrived on time 89% of the time, versus 80% across the Alaska Airlines network.
The breakdown
- Mon94%(17 flights)
- Tue83%(18 flights)
- Wed95%(19 flights)
- Thu78%(18 flights)
- Fri88%(16 flights)
- Sat94%(17 flights)
- Sun94%(18 flights)
- 12–3 PM—(1 flights)
- 3–6 PM90%(122 flights)
83%
Sep
Jun 90% → Sep 83% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 90% | 30 |
| July 2025 | 97% | 29 |
| August 2025 | 93% | 30 |
| September 2025 | 83% | 30 |
- Departures on time
- 86%
- Diverted
- 0%
- Flights flown
- 123
- Months covered
- 6
Same route, other flights
Keep nerding
Based on 125 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.