Historical on-time performance
Portland to Chicago
895 miData through Dec 2025Source: 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.
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 (2023-01 .. 2025-12).
Best time of day
On-time rates are fairly even by time of day on this route — ranging from 57% to 96% on time.
- Middays96% on time · p90 5 min · 56 flights · limited
- Mornings88% on time · p90 25 min · 51 flights · limited
- Afternoons78% on time · p90 35 min · 126 flights · limited
- Evenings57% on time · p90 90 min · 223 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 56% to 82% on time.
- Wednesdays82% on time · p90 70 min · 65 flights · limited
- Tuesdays78% on time · p90 30 min · 65 flights · limited
- Mondays77% on time · p90 125 min · 64 flights · limited
- Thursdays73% on time · p90 55 min · 66 flights · limited
- Sundays67% on time · p90 90 min · 64 flights · limited
- Fridays67% on time · p90 75 min · 66 flights · limited
- Saturdays56% on time · p90 60 min · 66 flights · limited
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