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Flight Reliability

UA 4843 · United Airlines

Washington → Rochester (IAD–ROC)91% of its flights flew this route. The rest (IAD–SYR, IAD–PHL) are included in these numbers.

80
Pretty Reliable
WanderNerd Reliability Score
84%
Arrive within 15 minutes
6 min
Average arrival delay
2.6%
Cancelled
6 min early
Median arrival delay

Based on 269 historical flights. Data through May 2026.

What the data says

Friday is doing you no favors.

UA 4843 arrived on time 94% of the time on Tuesdays and just 77% on Fridays. That gap is worth planning around.

A bit ahead of the IAD–ROC route.

UA 4843 arrived on time 84% of the time, versus 78% across the IAD–ROC route.

A bit ahead of the United Airlines network.

UA 4843 arrived on time 84% of the time, versus 79% across the United Airlines network.

Trending in the right direction.

UA 4843 arrived on time 92% of the time over the last three months in the data, compared with 75% in the three months before that.

The breakdown

On-time by weekday
  • Mon82%(33 flights)
  • Tue94%(36 flights)
  • Wed83%(36 flights)
  • Thu85%(40 flights)
  • Fri77%(39 flights)
  • Sat88%(41 flights)
  • Sun78%(36 flights)
On-time by departure window
  • 12–3 PM84%(254 flights)
  • 6–9 PM—(7 flights)
On-time trend by month
97%
May

Jun 68% → May 97% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202568%19
July 202576%29
August 202594%17
October 202580%25
December 202558%12
January 202670%30
February 202696%27
March 202683%30
April 202697%30
May 202697%31
Departures on time
85%
Diverted
0.4%
Flights flown
261
Months covered
12

Same route, other flights

Keep nerding

Based on 269 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.