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Flight Reliability

UA 4860 · United Airlines

Rochester → Washington (ROC–IAD)92% of its flights flew this route. The rest (IAD–SYR, PIT–IAD) are included in these numbers.

57
A Little Dicey
WanderNerd Reliability Score
79%
Arrive within 15 minutes
25 min
Average arrival delay
4.9%
Cancelled
6 min early
Median arrival delay

Based on 266 historical flights. Data through May 2026.

What the data says

The 3–6 PM departure wins.

UA 4860 departing between 3–6 PM arrived on time 86% of the time, versus 78% between 12–3 PM.

Skip Thursday if you can.

UA 4860 arrived on time 83% of the time on Tuesdays. On Thursdays: 74%.

Keep a backup plan handy.

UA 4860 was cancelled 4.9% of the time. Typical for U.S. flights is around 1–2%.

Trending in the right direction.

UA 4860 arrived on time 91% 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%(33 flights)
  • Tue83%(36 flights)
  • Wed82%(34 flights)
  • Thu74%(39 flights)
  • Fri79%(38 flights)
  • Sat79%(38 flights)
  • Sun76%(33 flights)
On-time by departure window
  • 6–9 AM80%(10 flights)
  • 12–3 PM78%(206 flights)
  • 3–6 PM86%(35 flights)
On-time trend by month
86%
May

Jun 50% → May 86% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202550%18
July 202573%26
August 202573%15
October 202588%25
December 202558%12
January 202657%30
February 202696%26
March 202690%29
April 202697%30
May 202686%29
Departures on time
81%
Diverted
0.8%
Flights flown
251
Months covered
12

Same route, other flights

Keep nerding

Based on 266 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.