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Flight Reliability

UA 4351 · United Airlines

Huntsville → Washington (HSV–IAD)

88
Pretty Reliable
WanderNerd Reliability Score
85%
Arrive within 15 minutes
4 min
Average arrival delay
1.4%
Cancelled
13 min early
Median arrival delay

Based on 362 historical flights. Data through May 2026.

What the data says

The late departure is the smart one here.

UA 4351 departing between 6–9 PM arrived on time 86% of the time, versus 74% between 3–6 PM.

Saturday is the weak spot.

UA 4351 arrived on time 90% of the time on Thursdays. On Saturdays: 80%.

A bit ahead of the United Airlines network.

UA 4351 arrived on time 85% of the time, versus 79% across the United Airlines network.

Recent months have been rougher.

UA 4351 arrived on time 79% of the time over the last three months in the data, compared with 90% in the three months before that.

The breakdown

On-time by weekday
  • Mon84%(51 flights)
  • Tue85%(52 flights)
  • Wed86%(51 flights)
  • Thu90%(51 flights)
  • Fri86%(50 flights)
  • Sat80%(51 flights)
  • Sun84%(51 flights)
On-time by departure window
  • 3–6 PM74%(31 flights)
  • 6–9 PM86%(326 flights)
On-time trend by month
71%
May

Jun 63% → May 71% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202563%30
July 202576%29
August 202587%31
September 2025100%30
October 202597%30
November 202593%29
December 202581%31
January 202690%30
February 2026100%27
March 202669%29
April 202697%30
May 202671%31
Departures on time
85%
Diverted
0%
Flights flown
357
Months covered
12

Same route, other flights

Keep nerding

Based on 362 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.