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Route Reliability

Philadelphia → Denver

PHL–DEN · 1,558 miles · Philadelphia International Airport to Denver International Airport

77
Usually Fine
WanderNerd Reliability Score
77%
Arrive within 15 minutes
11 min
Average arrival delay
1.3%
Cancelled
2,995
Flights in the data

Data through May 2026.

Who flies it best

Ranked by on-time arrivals. Historical results, not predictions.

  1. 1.United Airlines85%961 flights
  2. 2.American Airlines75%852 flights
  3. 3.Southwest Airlines71%878 flights
  4. 4.Frontier Airlines69%304 flights

What the data says

Morning flights do better here.

PHL–DEN flights departing between 3–6 AM arrived on time 88% of the time, versus 61% between 6–9 PM.

Sunday scaries are real for this one.

PHL–DEN flights arrived on time 82% of the time on Saturdays. On Sundays: 73%.

United Airlines has a clear lead on this route.

United Airlines arrived on time 85% of the time on this route; Frontier Airlines managed 69%.

Trending in the right direction.

PHL–DEN flights arrived on time 79% of the time over the last three months in the data, compared with 71% in the three months before that.

Best historical flights

Ranked by on-time arrivals, minimum 100 flights. Past performance, not a promise.

Top flights by on-time rate

More flights on this route

The breakdown

On-time by weekday
  • Mon78%(448 flights)
  • Tue74%(389 flights)
  • Wed81%(391 flights)
  • Thu74%(440 flights)
  • Fri74%(452 flights)
  • Sat82%(391 flights)
  • Sun73%(428 flights)
On-time by departure window
  • 3–6 AM88%(155 flights)
  • 6–9 AM86%(864 flights)
  • 9 AM–12 PM84%(557 flights)
  • 12–3 PM70%(207 flights)
  • 3–6 PM70%(601 flights)
  • 6–9 PM61%(522 flights)
  • 9 PM–12 AM82%(33 flights)
On-time trend by month
78%
May

Jun 72% → May 78% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202572%294
July 202569%304
August 202577%303
September 202585%281
October 202582%248
November 202587%238
December 202558%232
January 202674%170
February 202681%167
March 202677%202
April 202681%224
May 202678%276

Keep nerding

Based on 2,995 historical flights, because apparently we checked. Historical flight data: U.S. Bureau of Transportation Statistics, June 2025 – May 2026. Data through May 2026. How we calculate this.