Historical on-time performance
Chicago to Portland
895 miData through Dec 2025Source: US DOT · BTS
Flights on MDW–PWM arrive on time 89% of the time over the last 12 months.
On-time rate89%arrived within 15 min
p90 delay10 min1 in 10 flights is worse (tail risk)
Cancelled0.8%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-time89%Medianon timep9010 minCancel0.8%Flights123
Why flights run late
Delay causes
- Airline31%
- Weather0%
- Air traffic (NAS)44%
- Late aircraft26%
- Security0%
Most delay minutes here are attributed to Air traffic (NAS).
Over time
On-time trend
By season
On-time rate by month
When to fly
Best time to fly MDW → PWM
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 81% to 83% on time.
- Evenings83% on time · p90 35 min · 59 flights · limited
- Mornings83% on time · p90 20 min · 92 flights · limited
- Middays81% on time · p90 25 min · 266 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 75% to 85% on time.
- Wednesdays85% on time · p90 15 min · 65 flights · limited
- Thursdays83% on time · p90 25 min · 66 flights · limited
- Tuesdays83% on time · p90 15 min · 65 flights · limited
- Mondays80% on time · p90 30 min · 64 flights · limited
- Saturdays79% on time · p90 20 min · 66 flights · limited
- Fridays79% on time · p90 30 min · 66 flights · limited
- Sundays75% on time · p90 30 min · 64 flights · limited
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