Historical on-time performance
Chicago to Portland
900 miData through Dec 2025Source: US DOT · BTS
Flights on ORD–PWM 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)
Cancelled1.0%of scheduled flights
based on 1,114 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.
- Republic AirwaysOn-time72%Medianon timep9050 minCancel1.2%Flights406
- SkyWest AirlinesOn-time76%Medianon timep9045 minCancel0.7%Flights275
- United AirlinesOn-time76%Medianon timep9040 minCancel1.0%Flights403
- Envoy AirOn-time73%Medianon timep9030 minCancel0.0%Flights30
Why flights run late
Delay causes
- Airline38%
- Weather4%
- Air traffic (NAS)17%
- Late aircraft42%
- Security0%
Most delay minutes here are attributed to Late aircraft.
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 (2023-01 .. 2025-12).
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 · 461 flights
- Middays80% on time · p90 35 min · 1,494 flights
- Overnights76% on time · p90 35 min · 71 flights · limited
- Evenings69% on time · p90 55 min · 1,227 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 73% to 80% on time.
- Tuesdays80% on time · p90 35 min · 442 flights
- Wednesdays79% on time · p90 35 min · 436 flights
- Mondays78% on time · p90 35 min · 476 flights
- Thursdays78% on time · p90 40 min · 483 flights
- Fridays77% on time · p90 40 min · 475 flights
- Saturdays77% on time · p90 35 min · 471 flights
- Sundays73% on time · p90 50 min · 487 flights
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