Delta Air Lines Denver, CO (DEN) to Seattle, WA (SEA) reliability

Among 868 scheduled Delta Air Lines flights from DEN to SEA, 78.5% arrived on time, 13.1% arrived at least 30 minutes late, and 0.9% 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

78.5%arrived on time

13.1%30+ min late

0.9%cancelled

868scheduled flights

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

30+ minutes late13.1%

60+ minutes late7.1%

Cancelled0.9%

Average arrival+9.1 mincompleted flights

What did Delta Air Lines DEN to SEA record?

Delta Air Lines completed 99.1% of its scheduled reportable DEN to SEA flights in the observation window. 78.5% of all scheduled flights arrived less than 15 minutes late, while 7.1% arrived at least an hour late.

What were Delta Air Lines DEN to SEA disruption rates?

For Delta Air Lines DEN-to-SEA flights, 13.1% arrived at least 30 minutes late, 0.9% were cancelled, and 0.0% were diverted.

Compare all airlines on this route

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

The Delta Air Lines DEN-to-SEA cohort contained 868 scheduled flights; 860 completed, 8 were cancelled, and 0 were diverted.

Not a prediction.

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