Historical on-time performance
Portland to Chicago
1,739 miData through May 2026Source: US DOT · BTS
Flights on PDX–ORD arrive on time 76% of the time over the last 12 months.
On-time rate76%arrived within 15 min
p90 delay35 min1 in 10 flights is worse (tail risk)
Cancelled0.9%of scheduled flights
based on 2,650 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- United AirlinesbestOn-time80%Medianon timep9030 minCancel0.6%Flights1,385
- Alaska AirlinesOn-time72%Medianon timep9025 minCancel1.1%Flights464
- American AirlinesOn-time72%Medianon timep9055 minCancel1.4%Flights801
Why flights run late
Delay causes
- Airline37%
- Weather1%
- Air traffic (NAS)32%
- Late aircraft29%
- Security0%
Most delay minutes here are attributed to Airline.
When flights don't go
Why flights were cancelled
- Airline32%
- Weather64%
- Air traffic (NAS)4%
- Security0%
Most cancellations here are attributed to Weather. Shares are among 25 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 → ORD
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 — 85% on time.
- Mornings85% on time · p90 15 min · 2,411 flights
- Overnights80% on time · p90 35 min · 1,722 flights
- Middays79% on time · p90 30 min · 1,860 flights
- Evenings74% on time · p90 35 min · 103 flights · limited
- Early mornings72% on time · p90 70 min · 218 flights
- Afternoons72% on time · p90 40 min · 745 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 78% to 82% on time.
- Tuesdays82% on time · p90 25 min · 971 flights
- Saturdays82% on time · p90 25 min · 961 flights
- Wednesdays80% on time · p90 30 min · 992 flights
- Mondays80% on time · p90 25 min · 1,027 flights
- Sundays79% on time · p90 30 min · 1,016 flights
- Fridays79% on time · p90 35 min · 1,043 flights
- Thursdays78% on time · p90 30 min · 1,049 flights
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