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Route Reliability

GSO → Washington

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

83
Pretty Reliable
WanderNerd Reliability Score
84%
Arrive within 15 minutes
8 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 84% of the time across 828 flights. No comparison to make.

What the data says

Morning flights do better here.

GSO–IAD flights departing between 6–9 AM arrived on time 93% of the time, versus 76% between 12–3 PM.

Monday is the weak spot.

GSO–IAD flights arrived on time 89% of the time on Thursdays. On Mondays: 81%.

Trending in the right direction.

GSO–IAD flights arrived on time 86% of the time over the last three months in the data, compared with 75% 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
  • Mon81%(130 flights)
  • Tue86%(120 flights)
  • Wed81%(111 flights)
  • Thu89%(125 flights)
  • Fri85%(126 flights)
  • Sat85%(81 flights)
  • Sun84%(116 flights)
On-time by departure window
  • 6–9 AM93%(196 flights)
  • 9 AM–12 PM87%(174 flights)
  • 12–3 PM76%(208 flights)
  • 3–6 PM—(8 flights)
  • 6–9 PM82%(223 flights)
On-time trend by month
89%
May

Jun 79% → May 89% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202579%100
July 202591%76
August 202591%78
September 202593%70
October 202586%63
November 202583%53
December 202560%60
January 202685%52
February 202681%52
March 202681%57
April 202689%73
May 202689%75

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.