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Flight Reliability

UA 4865 · United Airlines

Washington → GSO (IAD–GSO)88% of its flights flew this route. The rest (XNA–IAH, BTV–IAD) are included in these numbers.

68
Usually Fine
WanderNerd Reliability Score
75%
Arrive within 15 minutes
17 min
Average arrival delay
2.9%
Cancelled
6 min early
Median arrival delay

Based on 275 historical flights. Data through May 2026.

What the data says

Morning flights do better here.

UA 4865 departing between 9 AM–12 PM arrived on time 95% of the time, versus 60% between 12–3 PM.

Sunday scaries are real for this one.

UA 4865 arrived on time 85% of the time on Wednesdays and just 66% on Sundays. That gap is worth planning around.

A bit behind the IAD–GSO route.

UA 4865 arrived on time 75% of the time, versus 81% across the IAD–GSO route.

A bit behind the United Airlines network.

UA 4865 arrived on time 75% of the time, versus 79% across the United Airlines network.

The breakdown

On-time by weekday
  • Mon76%(42 flights)
  • Tue79%(42 flights)
  • Wed85%(40 flights)
  • Thu80%(40 flights)
  • Fri67%(36 flights)
  • Sat72%(32 flights)
  • Sun66%(35 flights)
On-time by departure window
  • 9 AM–12 PM95%(19 flights)
  • 12–3 PM60%(15 flights)
  • 3–6 PM75%(233 flights)
On-time trend by month
82%
Mar

Jun 50% → Mar 82% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202550%24
July 202559%29
August 202583%23
September 202580%30
October 202587%30
November 202583%24
December 202565%31
January 202684%25
February 202683%24
March 202682%27
Departures on time
76%
Diverted
0%
Flights flown
267
Months covered
10

Same route, other flights

Keep nerding

Based on 275 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.