Historical on-time performance
Portland to Chicago
895 miData through May 2026Source: US DOT · BTS
Flights on PWM–MDW arrive on time 76% of the time over the last 12 months.
On-time rate76%arrived within 15 min
p90 delay65 min1 in 10 flights is worse (tail risk)
Cancelled2.4%of scheduled flights
based on 123 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- Southwest AirlinesOn-time76%Medianon timep9065 minCancel2.4%Flights123
Why flights run late
Delay causes
- Airline25%
- Weather1%
- Air traffic (NAS)17%
- Late aircraft57%
- Security0%
Most delay minutes here are attributed to Late aircraft.
When flights don't go
Why flights were cancelled
- Airline100%
- Weather0%
- Air traffic (NAS)0%
- Security0%
Most cancellations here are attributed to Airline. Shares are among 3 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 → MDW
All airlines · rolling 36 months (2023-06 .. 2026-05).
Best time of day
Afternoons are the most reliable time of day to fly this route — 78% on time.
- Afternoons78% on time · p90 35 min · 126 flights · limited
- Evenings57% on time · p90 90 min · 223 flights
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