Historical on-time performance
Philadelphia to Denver
1,557 miData through May 2026Source: US DOT · BTS
Flights on PHL–DEN arrive on time 75% of the time over the last 12 months.
On-time rate75%arrived within 15 min
p90 delay50 min1 in 10 flights is worse (tail risk)
Cancelled1.2%of scheduled flights
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
- United AirlinesbestOn-time83%Medianon timep9035 minCancel1.0%Flights961
- American AirlinesOn-time73%Medianon timep9060 minCancel1.8%Flights852
- Frontier AirlinesOn-time71%Medianon timep90110 minCancel0.6%Flights163
- Southwest AirlinesOn-time68%Medianon timep9050 minCancel0.9%Flights878
Why flights run late
Delay causes
- Airline37%
- Weather4%
- Air traffic (NAS)23%
- Late aircraft35%
- Security0%
Most delay minutes here are attributed to Airline.
When flights don't go
Why flights were cancelled
- Airline24%
- Weather68%
- Air traffic (NAS)9%
- Security0%
Most cancellations here are attributed to Weather. Shares are among 34 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 PHL → DEN
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 — 86% on time.
- Mornings86% on time · p90 20 min · 3,332 flights
- Middays79% on time · p90 40 min · 1,742 flights
- Afternoons76% on time · p90 45 min · 1,536 flights
- Overnights65% on time · p90 75 min · 802 flights
- Evenings58% on time · p90 80 min · 1,464 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 73% to 80% on time.
- Wednesdays80% on time · p90 35 min · 1,208 flights
- Tuesdays78% on time · p90 45 min · 1,199 flights
- Saturdays77% on time · p90 40 min · 1,162 flights
- Mondays77% on time · p90 45 min · 1,333 flights
- Thursdays75% on time · p90 45 min · 1,337 flights
- Fridays74% on time · p90 55 min · 1,353 flights
- Sundays73% on time · p90 50 min · 1,284 flights
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