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

Alaska Airlines Seattle, WA (SEA) to Boston, MA (BOS) reliability

Among 1,207 scheduled Alaska Airlines flights from SEA to BOS, 72.8% arrived on time, 14.5% arrived at least 30 minutes late, and 1.0% 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
72.8%arrived on time
14.5%30+ min late
1.0%cancelled
1,207scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
30+ minutes late14.5%
60+ minutes late6.4%
Cancelled1.0%
Average arrival+4.2 mincompleted flights

What did Alaska Airlines SEA to BOS record?

Alaska Airlines completed 98.8% of its scheduled reportable SEA to BOS flights in the observation window. 72.8% of all scheduled flights arrived less than 15 minutes late, while 6.4% arrived at least an hour late.

What were Alaska Airlines SEA to BOS disruption rates?

For Alaska Airlines SEA-to-BOS flights, 14.5% arrived at least 30 minutes late, 1.0% were cancelled, and 0.2% were diverted.

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What was the Alaska Airlines SEA to BOS scheduled cohort?

The Alaska Airlines SEA-to-BOS cohort contained 1,207 scheduled flights; 1,192 completed, 12 were cancelled, and 3 were diverted.

Not a prediction.

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