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Route Reliability

Washington → Raleigh–Durham

IAD–RDU · 225 miles · Washington Dulles International Airport to Raleigh–Durham International Airport

83
Pretty Reliable
WanderNerd Reliability Score
82%
Arrive within 15 minutes
8 min
Average arrival delay
1.7%
Cancelled
1,510
Flights in the data

Data through May 2026.

Airlines on this route

  • United Airlines82% on time · 1,509 flights
  • Delta Air Lines100% on time · 1 flights

Too little history on this route to call a winner. We rank airlines only after 100 flights each.

What the data says

Morning flights do better here.

IAD–RDU flights departing between 6–9 AM arrived on time 91% of the time, versus 74% between 3–6 PM.

Sunday scaries are real for this one.

IAD–RDU flights arrived on time 86% of the time on Saturdays. On Sundays: 78%.

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
  • Mon80%(212 flights)
  • Tue86%(214 flights)
  • Wed83%(212 flights)
  • Thu79%(209 flights)
  • Fri83%(215 flights)
  • Sat86%(209 flights)
  • Sun78%(212 flights)
On-time by departure window
  • 6–9 AM91%(326 flights)
  • 12–3 PM86%(357 flights)
  • 3–6 PM74%(447 flights)
  • 9 PM–12 AM81%(353 flights)
On-time trend by month
89%
May

Jun 71% → May 89% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202571%143
July 202571%143
August 202587%135
September 202589%142
October 202586%123
November 202583%117
December 202577%124
January 202688%91
February 202685%99
March 202677%123
April 202688%120
May 202689%123

Same trip, other airports

Keep nerding

Based on 1,510 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.