BTS DATA COMPLETE THROUGH JUNE 2026HISTORICAL ODDS · NOT LIVE FLIGHT STATUS
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AIRLINE × ROUTE REPORT
ONT→SEA

Alaska Airlines Ontario, CA (ONT) to Seattle, WA (SEA) reliability

Among 1,268 scheduled Alaska Airlines flights from ONT to SEA, 79.7% arrived on time, 10.3% arrived at least 30 minutes late, and 2.4% were cancelled during July 2025–June 2026.

Source: U.S. Bureau of Transportation Statistics · Marketing carrier: Alaska Airlines (AS) · Updated September 16, 2026

HISTORICAL ROUTE SIGNALGenerally reliable
79.7%arrived on time
10.3%30+ min late
2.4%cancelled
1,268scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
30+ minutes late10.3%
60+ minutes late4.2%
Cancelled2.4%
Average arrival+2.4 mincompleted flights

What did Alaska Airlines ONT to SEA record?

Alaska Airlines completed 97.6% of its scheduled reportable ONT to SEA flights in the observation window. 79.7% of all scheduled flights arrived less than 15 minutes late, while 4.2% arrived at least an hour late.

What were Alaska Airlines ONT to SEA disruption rates?

For Alaska Airlines ONT-to-SEA flights, 10.3% arrived at least 30 minutes late, 2.4% were cancelled, and 0.0% were diverted.

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What was the Alaska Airlines ONT to SEA scheduled cohort?

The Alaska Airlines ONT-to-SEA cohort contained 1,268 scheduled flights; 1,238 completed, 30 were cancelled, and 0 were diverted.

Not a prediction.

This is a descriptive historical rate. Schedule changes, seasonal operations and current conditions may differ.