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

Alaska Airlines Seattle, WA (SEA) to Philadelphia, PA (PHL) reliability

Among 656 scheduled Alaska Airlines flights from SEA to PHL, 78.0% arrived on time, 11.7% arrived at least 30 minutes late, and 1.4% 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
78.0%arrived on time
11.7%30+ min late
1.4%cancelled
656scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
30+ minutes late11.7%
60+ minutes late4.0%
Cancelled1.4%
Average arrival+1.0 mincompleted flights

What did Alaska Airlines SEA to PHL record?

Alaska Airlines completed 98.2% of its scheduled reportable SEA to PHL flights in the observation window. 78.0% of all scheduled flights arrived less than 15 minutes late, while 4.0% arrived at least an hour late.

What were Alaska Airlines SEA to PHL disruption rates?

For Alaska Airlines SEA-to-PHL flights, 11.7% arrived at least 30 minutes late, 1.4% were cancelled, and 0.5% were diverted.

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What was the Alaska Airlines SEA to PHL scheduled cohort?

The Alaska Airlines SEA-to-PHL cohort contained 656 scheduled flights; 644 completed, 9 were cancelled, and 3 were diverted.

Not a prediction.

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