Historical on-time performance

SEADEN

Seattle to Denver

1,024 miData through Dec 2025Source: US DOT · BTS

Flights on SEA–DEN arrive on time 74% of the time over the last 12 months.

On-time rate74%arrived within 15 min

Median delayon timetypical arrival

p90 delay50 min1 in 10 flights is worsetail risk

Cancelled0.7%of scheduled flights

based on 6,233 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).

By airline

How each carrier compares

Airline	On-time	Median	p90	Cancel	Flights
United Airlinesbest	84%	on time	25 min	0.6%	1,945
SkyWest Airlines⚠ low data	79%	on time	30 min	0.7%	144
Alaska Airlines	67%	on time	55 min	0.7%	1,563
Delta Air Lines	72%	on time	65 min	0.8%	892
Southwest Airlines	70%	on time	55 min	0.4%	1,384
Frontier Airlines	69%	on time	60 min	2.3%	305

United Airlinesbest
On-time84%
Medianon time
p9025 min
Cancel0.6%
Flights1,945
SkyWest Airlines
On-time79%
Medianon time
p9030 min
Cancel0.7%
Flights144
Alaska Airlines
On-time67%
Medianon time
p9055 min
Cancel0.7%
Flights1,563
Delta Air Lines
On-time72%
Medianon time
p9065 min
Cancel0.8%
Flights892
Southwest Airlines
On-time70%
Medianon time
p9055 min
Cancel0.4%
Flights1,384
Frontier Airlines
On-time69%
Medianon time
p9060 min
Cancel2.3%
Flights305

Why flights run late

Delay causes

Airline29%
Weather4%
Air traffic (NAS)38%
Late aircraft29%
Security0%

Most delay minutes here are attributed to Air traffic (NAS).

Over time

On-time trend

By season

On-time rate by month

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Keep exploring

Related pages

Delay predictorfor this route→SEA airportSeattle→DEN airportDenver→United Airlines on this routecarrier detail→United Airlinesairline profile→