Historical on-time performance
Portland to Chicago
1,751 miData through Dec 2025Source: 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 delay20 min1 in 10 flights is worse (tail risk)
Cancelled0.2%of scheduled flights
based on 571 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 timep9020 minCancel0.2%Flights571
Why flights run late
Delay causes
- Airline44%
- Weather0%
- Air traffic (NAS)13%
- Late aircraft42%
- Security1%
Most delay minutes here are attributed to Airline.
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 (2023-01 .. 2025-12).
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 · 1,057 flights
- Middays81% on time · p90 20 min · 494 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 81% to 91% on time.
- Saturdays91% on time · p90 10 min · 225 flights
- Tuesdays90% on time · p90 10 min · 252 flights
- Mondays87% on time · p90 15 min · 255 flights
- Fridays87% on time · p90 15 min · 254 flights
- Wednesdays87% on time · p90 15 min · 252 flights
- Thursdays85% on time · p90 20 min · 254 flights
- Sundays81% on time · p90 20 min · 203 flights
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