Historical on-time performance

DENSEA

Denver to Seattle

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

Flights on DEN–SEA arrive on time 71% of the time over the last 12 months.

On-time rate71%arrived within 15 min

Median delayon timetypical arrival

p90 delay50 min1 in 10 flights is worsetail risk

Cancelled0.7%of scheduled flights

based on 6,223 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
Delta Air Lines	75%	on time	60 min	0.8%	891
Alaska Airlines	68%	on time	50 min	1.0%	1,560
SkyWest Airlinesbest⚠ low data	82%	on time	30 min	0.7%	144
United Airlines	78%	on time	40 min	0.5%	1,944
Frontier Airlines	69%	on time	70 min	2.0%	305
Southwest Airlines	61%	5 min	60 min	0.4%	1,379

Delta Air Lines
On-time75%
Medianon time
p9060 min
Cancel0.8%
Flights891
Alaska Airlines
On-time68%
Medianon time
p9050 min
Cancel1.0%
Flights1,560
SkyWest Airlinesbest
On-time82%
Medianon time
p9030 min
Cancel0.7%
Flights144
United Airlines
On-time78%
Medianon time
p9040 min
Cancel0.5%
Flights1,944
Frontier Airlines
On-time69%
Medianon time
p9070 min
Cancel2.0%
Flights305
Southwest Airlines
On-time61%
Median5 min
p9060 min
Cancel0.4%
Flights1,379

Why flights run late

Delay causes

Airline31%
Weather3%
Air traffic (NAS)15%
Late aircraft51%
Security0%

Most delay minutes here are attributed to Late aircraft.

Over time

On-time trend

By season

On-time rate by month

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Related pages

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