Delta Air Lines Seattle, WA (SEA) to Boston, MA (BOS) reliability

Among 1,005 scheduled Delta Air Lines flights from SEA to BOS, 79.4% arrived on time, 10.2% arrived at least 30 minutes late, and 1.5% were cancelled during July 2025–June 2026.

Source: U.S. Bureau of Transportation Statistics · Marketing carrier: Delta Air Lines (DL) · Updated September 16, 2026

HISTORICAL ROUTE SIGNALGenerally reliable

79.4%arrived on time

10.2%30+ min late

1.5%cancelled

1,005scheduled flights

Based on July 2025–June 2026; on time means arrival less than 15 minutes late.

30+ minutes late10.2%

60+ minutes late5.4%

Cancelled1.5%

Average arrival+2.1 mincompleted flights

What did Delta Air Lines SEA to BOS record?

Delta Air Lines completed 97.8% of its scheduled reportable SEA to BOS flights in the observation window. 79.4% of all scheduled flights arrived less than 15 minutes late, while 5.4% arrived at least an hour late.

What were Delta Air Lines SEA to BOS disruption rates?

For Delta Air Lines SEA-to-BOS flights, 10.2% arrived at least 30 minutes late, 1.5% were cancelled, and 0.7% were diverted.

Compare all airlines on this route

What was the Delta Air Lines SEA to BOS scheduled cohort?

The Delta Air Lines SEA-to-BOS cohort contained 1,005 scheduled flights; 983 completed, 15 were cancelled, and 7 were diverted.

Not a prediction.

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