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Flight Reliability

UA 4240 · United Airlines

Huntsville → Washington (HSV–IAD)96% of its flights flew this route. The rest (IAH–LFT) are included in these numbers.

82
Pretty Reliable
WanderNerd Reliability Score
84%
Arrive within 15 minutes
1 min early
Average arrival delay
2.6%
Cancelled
15 min early
Median arrival delay

Based on 340 historical flights. Data through May 2026.

What the data says

Saturdays have been rough.

UA 4240 arrived on time 94% of the time on Mondays and just 75% on Saturdays. That gap is worth planning around.

A bit ahead of the United Airlines network.

UA 4240 arrived on time 84% of the time, versus 79% across the United Airlines network.

Slipping a little lately.

UA 4240 arrived on time 83% of the time over the last three months in the data, compared with 88% in the three months before that.

The breakdown

On-time by weekday
  • Mon94%(49 flights)
  • Tue83%(40 flights)
  • Wed81%(42 flights)
  • Thu88%(51 flights)
  • Fri92%(51 flights)
  • Sat75%(47 flights)
  • Sun77%(51 flights)
On-time by departure window
  • 6–9 AM84%(317 flights)
  • 9 AM–12 PM86%(14 flights)
On-time trend by month
74%
May

Jun 76% → May 74% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202576%29
July 202574%27
August 202587%31
September 202590%30
October 202594%31
November 202579%29
December 202590%30
January 202694%17
February 202679%19
March 202689%27
April 202687%30
May 202674%31
Departures on time
84%
Diverted
0%
Flights flown
331
Months covered
12

Same route, other flights

Keep nerding

Based on 340 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.