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Flight Reliability

UA 4291 · United Airlines

Buffalo → Washington (BUF–IAD)93% of its flights flew this route. The rest (PHL–IAD, IAD–CHS) are included in these numbers.

71
Usually Fine
WanderNerd Reliability Score
77%
Arrive within 15 minutes
19 min
Average arrival delay
2.2%
Cancelled
6 min early
Median arrival delay

Based on 318 historical flights. Data through May 2026.

What the data says

3–6 PM has a slight edge.

Departures between 3–6 PM arrived on time 80% of the time, against 77% between 12–3 PM.

Skip Wednesday if you can.

UA 4291 arrived on time 82% of the time on Mondays. On Wednesdays: 71%.

A bit behind the BUF–IAD route.

UA 4291 arrived on time 77% of the time, versus 82% across the BUF–IAD route.

Trending in the right direction.

UA 4291 arrived on time 86% of the time over the last three months in the data, compared with 70% in the three months before that.

The breakdown

On-time by weekday
  • Mon82%(45 flights)
  • Tue76%(41 flights)
  • Wed71%(45 flights)
  • Thu81%(47 flights)
  • Fri81%(41 flights)
  • Sat72%(46 flights)
  • Sun78%(45 flights)
On-time by departure window
  • 6–9 AM—(2 flights)
  • 12–3 PM77%(285 flights)
  • 3–6 PM80%(20 flights)
  • 6–9 PM—(3 flights)
On-time trend by month
84%
May

Jun 60% → May 84% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202560%30
July 202573%30
August 202577%26
September 202586%21
October 202581%31
November 202576%29
December 202567%15
January 202671%28
February 202671%14
March 202676%25
April 202697%30
May 202684%31
Departures on time
78%
Diverted
0.3%
Flights flown
310
Months covered
12

Same route, other flights

Keep nerding

Based on 318 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.