Historical on-time performance
Denver to Portland
991 miData through May 2026Source: US DOT · BTS
Flights on DEN–PDX arrive on time 74% of the time over the last 12 months.
On-time rate74%arrived within 15 min
p90 delay45 min1 in 10 flights is worse (tail risk)
Cancelled0.5%of scheduled flights
based on 4,126 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- United AirlinesbestOn-time82%Medianon timep9035 minCancel0.4%Flights1,822
- Alaska AirlinesOn-time75%Medianon timep9045 minCancel0.6%Flights527
- Frontier AirlinesOn-time72%Medianon timep9060 minCancel1.5%Flights204
- Southwest AirlinesOn-time64%Median5 minp9050 minCancel0.4%Flights1,573
Why flights run late
Delay causes
- Airline30%
- Weather2%
- Air traffic (NAS)12%
- Late aircraft56%
- Security0%
Most delay minutes here are attributed to Late aircraft.
When flights don't go
Why flights were cancelled
- Airline25%
- Weather45%
- Air traffic (NAS)30%
- Security0%
Most cancellations here are attributed to Weather. Shares are among 20 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 DEN → PDX
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 — 88% on time.
- Mornings88% on time · p90 15 min · 3,219 flights
- Middays82% on time · p90 25 min · 2,775 flights
- Afternoons72% on time · p90 45 min · 2,041 flights
- Evenings66% on time · p90 55 min · 2,409 flights
- Overnights66% on time · p90 65 min · 2,851 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 73% to 78% on time.
- Tuesdays78% on time · p90 35 min · 1,800 flights
- Saturdays77% on time · p90 40 min · 1,689 flights
- Mondays76% on time · p90 40 min · 1,999 flights
- Sundays76% on time · p90 45 min · 1,927 flights
- Wednesdays76% on time · p90 40 min · 1,844 flights
- Fridays74% on time · p90 45 min · 2,023 flights
- Thursdays73% on time · p90 45 min · 2,015 flights
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