About 1 in 3 AS 594 flights from Ontario arrived 15+ minutes late, diverted or cancelled over the past year (34%); 0.0% were cancelled. The typical flight landed 0 minutes early.
AS 594: ONT → SEA
Scheduled to leave Ontario at 9:20 p.m. local time. Over the past year it arrived on time 66% of the time (137 flights), in line with other AS flights on the route at that hour (68%). Last seen in the data Aug 31, 2026.
Usually Alaska Airlines's last flight of the day from Ontario to Seattle (100% of days). Alaska Airlines's last ONT–SEA flight was cancelled 0.5% of the time, against 2.2% for its earlier ones. If it's cancelled, the next Alaska Airlines flight is usually around 6:02 a.m. the next morning.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 30 | 60% |
| Tuesday | 9 | — |
| Wednesday | 7 | — |
| Thursday | 26 | 65% |
| Friday | 28 | 75% |
| Saturday | 8 | — |
| Sunday | 29 | 52% |
Why it was late
All flights ONT → SEA · Connecting off AS 594? Check the risk
Questions
How often is AS 594 from ONT to SEA late?
Alaska Airlines 594 from Ontario, CA to Seattle, WA arrived 15 or more minutes late, was diverted or was cancelled on 34% of 137 scheduled flights between September 2025 and August 2026. 0.0% were cancelled.
Flight numbers change. Figures cover flights with this airline, number and route only. "Likely range" is the 95% interval for the true on-time rate given the number of flights. This is history, not live status: check Alaska Airlines for today's flight. Method.