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Route Reliability

Washington → GSO

IAD–GSO · 239 miles · Washington Dulles International Airport to GSO Airport

81
Pretty Reliable
WanderNerd Reliability Score
81%
Arrive within 15 minutes
10 min
Average arrival delay
1.9%
Cancelled
828
Flights in the data

Data through May 2026.

United Airlines is the only airline in this data on this route, arriving on time 81% of the time across 828 flights. No comparison to make.

What the data says

The 12–3 PM departure wins.

IAD–GSO flights departing between 12–3 PM arrived on time 85% of the time, versus 76% between 3–6 PM.

Sunday scaries are real for this one.

IAD–GSO flights arrived on time 85% of the time on Thursdays. On Sundays: 76%.

Trending in the right direction.

IAD–GSO flights arrived on time 88% of the time over the last three months in the data, compared with 78% 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
  • Mon82%(130 flights)
  • Tue84%(120 flights)
  • Wed82%(112 flights)
  • Thu85%(126 flights)
  • Fri78%(126 flights)
  • Sat80%(81 flights)
  • Sun76%(117 flights)
On-time by departure window
  • 6–9 AM85%(162 flights)
  • 12–3 PM85%(218 flights)
  • 3–6 PM76%(270 flights)
  • 9 PM–12 AM80%(162 flights)
On-time trend by month
89%
May

Jun 69% → May 89% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202569%102
July 202572%76
August 202581%78
September 202589%70
October 202587%62
November 202587%53
December 202562%60
January 202685%53
February 202687%52
March 202683%59
April 202690%73
May 202689%74

Same trip, other airports

Keep nerding

Based on 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.