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Flight Reliability

UA 4909 · United Airlines

Huntsville → Houston (HSV–IAH)100% of its flights flew this route. The rest (IAD–BUF) are included in these numbers.

92
Nerd Approved
WanderNerd Reliability Score
85%
Arrive within 15 minutes
4 min
Average arrival delay
0%
Cancelled
17 min early
Median arrival delay

Based on 359 historical flights. Data through May 2026.

What the data says

Sunday scaries are real for this one.

UA 4909 arrived on time 94% of the time on Tuesdays. On Sundays: 81%.

A bit ahead of the HSV–IAH route.

UA 4909 arrived on time 85% of the time, versus 79% across the HSV–IAH route.

A bit ahead of the United Airlines network.

UA 4909 arrived on time 85% of the time, versus 79% across the United Airlines network.

It basically never cancels.

Out of 359 scheduled flights, only 0.0% were cancelled.

The breakdown

On-time by weekday
  • Mon83%(52 flights)
  • Tue94%(52 flights)
  • Wed88%(50 flights)
  • Thu86%(51 flights)
  • Fri81%(52 flights)
  • Sat82%(49 flights)
  • Sun81%(52 flights)
On-time by departure window
  • 9 AM–12 PM85%(357 flights)
  • 9 PM–12 AM—(1 flights)
On-time trend by month
87%
May

Jun 66% → May 87% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202566%29
July 202577%31
August 202571%31
September 202597%29
October 202587%31
November 202597%30
December 202577%31
January 202697%31
February 202683%23
March 202684%31
April 202697%30
May 202687%31
Departures on time
88%
Diverted
0.3%
Flights flown
358
Months covered
12

Same route, other flights

Keep nerding

Based on 359 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.