Historical on-time performance
Portland to Chicago
1,751 miData through May 2026Source: US DOT · BTS
Flights on PDX–MDW arrive on time 87% of the time over the last 12 months.
On-time rate87%arrived within 15 min
p90 delay15 min1 in 10 flights is worse (tail risk)
Cancelled0.8%of scheduled flights
based on 658 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- Southwest AirlinesOn-time87%Medianon timep9015 minCancel0.8%Flights658
Why flights run late
Delay causes
- Airline33%
- Weather0%
- Air traffic (NAS)23%
- Late aircraft43%
- Security1%
Most delay minutes here are attributed to Late aircraft.
When flights don't go
Why flights were cancelled
- Airline20%
- Weather60%
- Air traffic (NAS)20%
- Security0%
Most cancellations here are attributed to Weather. Shares are among 5 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 → MDW
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 — 93% on time.
- Mornings93% on time · p90 5 min · 1,179 flights
- Middays82% on time · p90 20 min · 374 flights
- Afternoons62% on time · p90 35 min · 119 flights · limited
Best day of week
On-time rates are fairly even by day on this route — ranging from 83% to 91% on time.
- Tuesdays91% on time · p90 10 min · 263 flights
- Saturdays91% on time · p90 10 min · 239 flights
- Wednesdays90% on time · p90 10 min · 263 flights
- Fridays88% on time · p90 15 min · 268 flights
- Mondays88% on time · p90 15 min · 266 flights
- Thursdays86% on time · p90 20 min · 268 flights
- Sundays83% on time · p90 20 min · 218 flights
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