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Route Reliability

Washington → Philadelphia

IAD–PHL · 135 miles · Washington Dulles International Airport to Philadelphia International Airport

72
Usually Fine
WanderNerd Reliability Score
77%
Arrive within 15 minutes
15 min
Average arrival delay
2.7%
Cancelled
1,097
Flights in the data

Data through May 2026.

United Airlines is the only airline in this data on this route, arriving on time 77% of the time across 1,097 flights. No comparison to make.

What the data says

Morning-you made the right choice.

IAD–PHL flights departing between 6–9 AM arrived on time 83% of the time, versus 61% between 9 PM–12 AM.

Skip Monday if you can.

IAD–PHL flights arrived on time 84% of the time on Tuesdays. On Mondays: 71%.

Ticking up lately.

IAD–PHL flights arrived on time 83% of the time over the last three months in the data, compared with 77% 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
  • Mon71%(160 flights)
  • Tue84%(165 flights)
  • Wed77%(160 flights)
  • Thu76%(164 flights)
  • Fri73%(158 flights)
  • Sat82%(125 flights)
  • Sun79%(135 flights)
On-time by departure window
  • 6–9 AM83%(325 flights)
  • 12–3 PM82%(324 flights)
  • 3–6 PM71%(317 flights)
  • 9 PM–12 AM61%(101 flights)
On-time trend by month
78%
May

Jun 59% → May 78% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202559%111
July 202566%104
August 202576%97
September 202585%82
October 202586%92
November 202588%76
December 202573%91
January 202671%82
February 202687%74
March 202682%84
April 202687%77
May 202678%97

Same trip, other airports

Keep nerding

Based on 1,097 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.