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Airport Reliability

IAD · Washington

Washington Dulles International Airport

82%
Departures within 15 minutes
15 min
Average departure delay
82%
Arrivals within 15 minutes
1.6%
Departures cancelled

Based on 91,828 departures and 91,829 arrivals. Data through May 2026.

What the data says

Morning flights do better here.

Departures from IAD departing between 9 AM–12 PM arrived on time 88% of the time, versus 71% between 6–9 PM.

Tuesday comes out ahead.

A small edge: 83% on time on Tuesdays against 77% on Sundays.

Ticking up lately.

Departures from IAD arrived on time 84% of the time over the last three months in the data, compared with 79% in the three months before that.

When IAD gets messy

On-time by departure window
  • 3–6 AM87%(285 flights)
  • 6–9 AM87%(22305 flights)
  • 9 AM–12 PM88%(5187 flights)
  • 12–3 PM82%(20979 flights)
  • 3–6 PM73%(24172 flights)
  • 6–9 PM71%(5824 flights)
  • 9 PM–12 AM78%(11332 flights)
On-time by weekday
  • Mon80%(13240 flights)
  • Tue83%(12295 flights)
  • Wed81%(12346 flights)
  • Thu80%(13291 flights)
  • Fri78%(13408 flights)
  • Sat81%(12244 flights)
  • Sun77%(13260 flights)
On-time trend by month
84%
May

Jun 69% → May 84% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202569%8403
July 202569%8078
August 202581%8023
September 202588%7423
October 202585%7620
November 202582%7223
December 202573%7441
January 202681%6384
February 202684%6072
March 202680%7437
April 202687%7746
May 202684%8234

Airlines departing IAD

Busiest routes from IAD

Based on 91,828 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.