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

Among 869 scheduled Delta Air Lines flights from SEA to DEN, 72.3% arrived on time, 17.3% 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

72.3%arrived on time

17.3%30+ min late

0.9%cancelled

869scheduled flights

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

30+ minutes late17.3%

60+ minutes late7.8%

Cancelled0.9%

Average arrival+7.7 mincompleted flights

What did Delta Air Lines SEA to DEN record?

Delta Air Lines completed 98.6% of its scheduled reportable SEA to DEN flights in the observation window. 72.3% of all scheduled flights arrived less than 15 minutes late, while 7.8% arrived at least an hour late.

What were Delta Air Lines SEA to DEN disruption rates?

For Delta Air Lines SEA-to-DEN flights, 17.3% arrived at least 30 minutes late, 0.9% were cancelled, and 0.5% were diverted.

Compare all airlines on this route

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

The Delta Air Lines SEA-to-DEN cohort contained 869 scheduled flights; 857 completed, 8 were cancelled, and 4 were diverted.

Not a prediction.

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