Historical on-time performance
Portland to Chicago
Flights on PWM–ORD arrive on time 75% of the time over the last 12 months.
based on 1,254 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- Republic AirwaysbestOn-time79%Medianon timep9035 minCancel2.3%Flights486
- Envoy AirOn-time77%Medianon timep9045 minCancel3.9%Flights155
- United AirlinesOn-time73%Medianon timep9040 minCancel2.1%Flights423
- SkyWest AirlinesOn-time65%Medianon timep9060 minCancel2.1%Flights190
Why flights run late
Delay causes
- Airline29%
- Weather10%
- Air traffic (NAS)41%
- Late aircraft19%
- Security0%
Most delay minutes here are attributed to Air traffic (NAS).
When flights don't go
Why flights were cancelled
- Airline13%
- Weather60%
- Air traffic (NAS)27%
- Security0%
Most cancellations here are attributed to Weather. Shares are among 30 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 PWM → ORD
All airlines · rolling 36 months (2023-06 .. 2026-05).
Best time of day
On-time rates are fairly even by time of day on this route — ranging from 65% to 87% on time.
- Mornings87% on time · p90 15 min · 1,360 flights
- Middays85% on time · p90 20 min · 492 flights
- Afternoons68% on time · p90 55 min · 1,168 flights
- Evenings65% on time · p90 70 min · 481 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 75% to 80% on time.
- Wednesdays80% on time · p90 30 min · 470 flights
- Saturdays78% on time · p90 40 min · 513 flights
- Mondays77% on time · p90 30 min · 512 flights
- Fridays77% on time · p90 35 min · 516 flights
- Tuesdays77% on time · p90 40 min · 480 flights
- Thursdays76% on time · p90 45 min · 519 flights
- Sundays75% on time · p90 55 min · 526 flights
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