PDX → DEN: 79% on-time

Historical on-time performance

Portland to Denver

991 miData through May 2026Source: US DOT · BTS

Flights on PDX–DEN arrive on time 79% of the time over the last 12 months.

On-time rate79%arrived within 15 min

p90 delay35 min1 in 10 flights is worse (tail risk)

Cancelled0.5%of scheduled flights

based on 4,156 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	88%	on time	15 min	0.6%	1,821
Alaska Airlines	74%	on time	50 min	0.4%	528
Southwest Airlines	71%	on time	40 min	0.3%	1,573
Frontier Airlines	68%	on time	60 min	1.7%	234

United Airlinesbest
On-time88%
Medianon time
p9015 min
Cancel0.6%
Flights1,821
Alaska Airlines
On-time74%
Medianon time
p9050 min
Cancel0.4%
Flights528
Southwest Airlines
On-time71%
Medianon time
p9040 min
Cancel0.3%
Flights1,573
Frontier Airlines
On-time68%
Medianon time
p9060 min
Cancel1.7%
Flights234

Why flights run late

Delay causes

Airline24%
Weather2%
Air traffic (NAS)40%
Late aircraft34%
Security0%

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

When flights don't go

Why flights were cancelled

Airline33%
Weather29%
Air traffic (NAS)38%
Security0%

Most cancellations here are attributed to Air traffic (NAS). Shares are among 21 cancellations with a reported cause (BTS reports causes from June 2003).

Over time

On-time trend

By season

On-time rate by month

When to fly

Best time to fly PDX → DEN

All airlines · rolling 36 months (2023-06 .. 2026-05).

Best time of day

Mornings are the most reliable time of day to fly this route — 91% on time.

Mornings91% on time · p90 10 min · 5,535 flights
Middays80% on time · p90 30 min · 3,042 flights
Evenings74% on time · p90 50 min · 1,708 flights
Afternoons71% on time · p90 55 min · 2,453 flights
Early mornings69% on time · p90 60 min · 293 flights
Overnights66% on time · p90 75 min · 245 flights

Best day of week

On-time rates are fairly even by day on this route — ranging from 78% to 84% on time.

Saturdays84% on time · p90 25 min · 1,672 flights
Sundays83% on time · p90 30 min · 1,933 flights
Tuesdays82% on time · p90 25 min · 1,796 flights
Wednesdays82% on time · p90 25 min · 1,845 flights
Mondays81% on time · p90 30 min · 1,996 flights
Thursdays81% on time · p90 35 min · 2,009 flights
Fridays78% on time · p90 35 min · 2,025 flights

Keep exploring

Delay predictorfor this route→PDX airportPortland→DEN airportDenver→United Airlinesairline profile→Southwest Airlinesairline profile→Alaska Airlinesairline profile→Seasonal delay patternsguide→