Historical on-time performance
Denver to Philadelphia
1,558 miData through Dec 2025Source: US DOT · BTS
Flights on DEN–PHL arrive on time 71% of the time over the last 12 months.
On-time rate71%arrived within 15 min
p90 delay55 min1 in 10 flights is worse (tail risk)
Cancelled1.0%of scheduled flights
based on 2,885 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.
- American AirlinesOn-time76%Medianon timep9040 minCancel2.6%Flights857
- United AirlinesOn-time76%Medianon timep9045 minCancel0.1%Flights979
- Southwest AirlinesOn-time65%Median5 minp9070 minCancel0.3%Flights887
- Frontier AirlinesOn-time49%Median10 minp90105 minCancel1.2%Flights162
Why flights run late
Delay causes
- Airline34%
- Weather2%
- Air traffic (NAS)17%
- Late aircraft48%
- Security0%
Most delay minutes here are attributed to Late aircraft.
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 (2023-01 .. 2025-12).
Best time of day
Mornings are the most reliable time of day to fly this route — 80% on time.
- Mornings80% on time · p90 30 min · 1,369 flights
- Middays76% on time · p90 40 min · 3,290 flights
- Overnights71% on time · p90 55 min · 1,350 flights
- Early mornings71% on time · p90 55 min · 325 flights
- Evenings64% on time · p90 70 min · 1,901 flights
- Afternoons58% on time · p90 95 min · 528 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 69% to 74% on time.
- Tuesdays74% on time · p90 50 min · 1,207 flights
- Saturdays73% on time · p90 50 min · 1,137 flights
- Wednesdays73% on time · p90 45 min · 1,234 flights
- Fridays72% on time · p90 50 min · 1,294 flights
- Sundays71% on time · p90 55 min · 1,296 flights
- Mondays71% on time · p90 65 min · 1,280 flights
- Thursdays69% on time · p90 55 min · 1,315 flights
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