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Route Reliability

Washington → ROA

IAD–ROA · 177 miles · Washington Dulles International Airport to ROA Airport

78
Usually Fine
WanderNerd Reliability Score
80%
Arrive within 15 minutes
12 min
Average arrival delay
2.0%
Cancelled
1,040
Flights in the data

Data through May 2026.

United Airlines is the only airline in this data on this route, arriving on time 80% of the time across 1,040 flights. No comparison to make.

What the data says

Mornings have a slight edge.

Departures between 6–9 AM arrived on time 85% of the time, against 79% between 12–3 PM.

Friday is doing you no favors.

IAD–ROA flights arrived on time 87% of the time on Saturdays. On Fridays: 75%.

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
  • Mon77%(151 flights)
  • Tue82%(148 flights)
  • Wed81%(145 flights)
  • Thu82%(155 flights)
  • Fri75%(148 flights)
  • Sat87%(122 flights)
  • Sun80%(146 flights)
On-time by departure window
  • 6–9 AM85%(153 flights)
  • 12–3 PM79%(320 flights)
  • 3–6 PM80%(284 flights)
  • 6–9 PM80%(54 flights)
  • 9 PM–12 AM79%(204 flights)
On-time trend by month
80%
May

Jun 68% → May 80% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202568%101
July 202572%65
August 202575%75
September 202589%84
October 202588%97
November 202584%108
December 202570%89
January 202682%68
February 202690%51
March 202675%81
April 202692%87
May 202680%109

Keep nerding

Based on 1,040 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.