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Flight Reliability

UA 4823 · United Airlines

Washington → Buffalo (IAD–BUF)88% of its flights flew this route. The rest (LBB–IAH, IAD–CMH) are included in these numbers.

61
A Little Dicey
WanderNerd Reliability Score
75%
Arrive within 15 minutes
18 min
Average arrival delay
4.7%
Cancelled
3 min early
Median arrival delay

Based on 276 historical flights. Data through May 2026.

What the data says

Morning flights do better here.

UA 4823 departing between 6–9 AM arrived on time 97% of the time, versus 73% between 3–6 PM.

Wednesdays have been rough.

UA 4823 arrived on time 82% of the time on Mondays and just 67% on Wednesdays. That gap is worth planning around.

A bit behind the IAD–BUF route.

UA 4823 arrived on time 75% of the time, versus 78% across the IAD–BUF route.

A bit behind the United Airlines network.

UA 4823 arrived on time 75% of the time, versus 79% across the United Airlines network.

The breakdown

On-time by weekday
  • Mon82%(34 flights)
  • Tue74%(39 flights)
  • Wed67%(39 flights)
  • Thu76%(38 flights)
  • Fri74%(39 flights)
  • Sat80%(39 flights)
  • Sun74%(35 flights)
On-time by departure window
  • 6–9 AM97%(30 flights)
  • 3–6 PM73%(233 flights)
On-time trend by month
74%
May

Jun 63% → May 74% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202563%27
July 202548%25
August 202582%17
October 202593%29
November 202595%21
December 202557%14
January 202676%29
February 202670%10
March 202669%26
April 202686%29
May 202674%31
Departures on time
80%
Diverted
0%
Flights flown
263
Months covered
12

Same route, other flights

Keep nerding

Based on 276 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.