Historical on-time performance
Denver to Philadelphia
Flights on DEN–PHL arrive on time 72% of the time over the last 12 months.
based on 2,854 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
Too close to call — no single carrier is clearly more on-time here.
- United AirlinesOn-time79%Medianon timep9035 minCancel0.5%Flights960
- American AirlinesOn-time77%Medianon timep9045 minCancel2.0%Flights853
- Southwest AirlinesOn-time62%Median5 minp9070 minCancel0.9%Flights878
- Frontier AirlinesOn-time52%Median10 minp9095 minCancel1.2%Flights163
Why flights run late
Delay causes
- Airline35%
- Weather2%
- Air traffic (NAS)16%
- Late aircraft47%
- Security0%
Most delay minutes here are attributed to Late aircraft.
When flights don't go
Why flights were cancelled
- Airline16%
- Weather81%
- Air traffic (NAS)3%
- Security0%
Most cancellations here are attributed to Weather. Shares are among 32 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 DEN → 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 30 min · 1,516 flights
- Middays76% on time · p90 40 min · 3,246 flights
- Overnights72% on time · p90 50 min · 1,313 flights
- Evenings63% on time · p90 70 min · 2,011 flights
- Afternoons61% on time · p90 95 min · 630 flights
- Early mornings60% on time · p90 80 min · 175 flights · limited
Best day of week
On-time rates are fairly even by day on this route — ranging from 69% to 75% on time.
- Saturdays75% on time · p90 45 min · 1,145 flights
- Tuesdays74% on time · p90 45 min · 1,198 flights
- Wednesdays74% on time · p90 45 min · 1,241 flights
- Fridays72% on time · p90 50 min · 1,343 flights
- Mondays70% on time · p90 65 min · 1,304 flights
- Sundays70% on time · p90 55 min · 1,318 flights
- Thursdays69% on time · p90 55 min · 1,342 flights
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