Historical on-time performance
Chicago to Philadelphia
678 miData through May 2026Source: US DOT · BTS
Flights on ORD–PHL arrive on time 69% of the time over the last 12 months.
On-time rate69%arrived within 15 min
p90 delay75 min1 in 10 flights is worse (tail risk)
Cancelled2.8%of scheduled flights
based on 4,610 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- United AirlinesbestOn-time71%Medianon timep9065 minCancel1.2%Flights1,718
- American AirlinesOn-time68%Medianon timep9080 minCancel3.7%Flights2,892
Why flights run late
Delay causes
- Airline30%
- Weather5%
- Air traffic (NAS)17%
- Late aircraft47%
- Security0%
Most delay minutes here are attributed to Late aircraft.
When flights don't go
Why flights were cancelled
- Airline10%
- Weather80%
- Air traffic (NAS)10%
- Security0%
Most cancellations here are attributed to Weather. Shares are among 127 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 ORD → PHL
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 — 81% on time.
- Mornings81% on time · p90 40 min · 4,364 flights
- Middays76% on time · p90 50 min · 2,241 flights
- Evenings65% on time · p90 75 min · 2,695 flights
- Afternoons63% on time · p90 85 min · 2,930 flights
- Overnights58% on time · p90 100 min · 1,332 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 67% to 75% on time.
- Saturdays75% on time · p90 50 min · 1,661 flights
- Tuesdays75% on time · p90 60 min · 1,908 flights
- Wednesdays73% on time · p90 60 min · 1,915 flights
- Thursdays70% on time · p90 70 min · 2,002 flights
- Fridays69% on time · p90 70 min · 2,046 flights
- Mondays69% on time · p90 80 min · 2,030 flights
- Sundays67% on time · p90 75 min · 2,002 flights
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