Historical on-time performance
Chicago to Portland
Flights on ORD–PWM arrive on time 73% of the time over the last 12 months.
based on 1,258 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
Too close to call — no single carrier is clearly more on-time here.
- Envoy AirOn-time76%Medianon timep9050 minCancel3.2%Flights185
- SkyWest AirlinesOn-time75%Medianon timep9045 minCancel1.1%Flights190
- Republic AirwaysOn-time73%Medianon timep9050 minCancel2.0%Flights459
- United AirlinesOn-time72%Medianon timep9060 minCancel0.9%Flights424
Why flights run late
Delay causes
- Airline33%
- Weather6%
- Air traffic (NAS)17%
- Late aircraft44%
- Security0%
Most delay minutes here are attributed to Late aircraft.
When flights don't go
Why flights were cancelled
- Airline0%
- Weather81%
- Air traffic (NAS)19%
- Security0%
Most cancellations here are attributed to Weather. 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 ORD → PWM
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 · 492 flights
- Middays79% on time · p90 35 min · 1,613 flights
- Overnights73% on time · p90 40 min · 119 flights · limited
- Evenings67% on time · p90 60 min · 1,266 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 73% to 79% on time.
- Tuesdays79% on time · p90 45 min · 476 flights
- Wednesdays78% on time · p90 40 min · 471 flights
- Thursdays77% on time · p90 40 min · 524 flights
- Fridays77% on time · p90 40 min · 516 flights
- Saturdays76% on time · p90 35 min · 512 flights
- Mondays75% on time · p90 45 min · 510 flights
- Sundays73% on time · p90 55 min · 528 flights
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