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Flight Reliability

UA 4841 · United Airlines

Knoxville → Houston (TYS–IAH)89% of its flights flew this route. The rest (ORF–IAD, IAD–ROC) are included in these numbers.

84
Pretty Reliable
WanderNerd Reliability Score
83%
Arrive within 15 minutes
9 min
Average arrival delay
1.3%
Cancelled
13 min early
Median arrival delay

Based on 297 historical flights. Data through May 2026.

What the data says

The late departure is the smart one here.

UA 4841 departing between 9 PM–12 AM arrived on time 91% of the time, versus 67% between 6–9 PM.

Thursdays have been rough.

UA 4841 arrived on time 90% of the time on Tuesdays and just 74% on Thursdays. That gap is worth planning around.

A bit ahead of the United Airlines network.

UA 4841 arrived on time 83% of the time, versus 79% across the United Airlines network.

Ticking up lately.

UA 4841 arrived on time 85% of the time over the last three months in the data, compared with 81% in the three months before that.

The breakdown

On-time by weekday
  • Mon79%(43 flights)
  • Tue90%(38 flights)
  • Wed83%(42 flights)
  • Thu74%(42 flights)
  • Fri80%(44 flights)
  • Sat85%(39 flights)
  • Sun89%(44 flights)
On-time by departure window
  • 9 AM–12 PM83%(263 flights)
  • 6–9 PM67%(18 flights)
  • 9 PM–12 AM91%(11 flights)
On-time trend by month
76%
May

Jun 70% → May 76% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202570%30
July 202590%30
August 202577%31
September 202593%30
October 202584%31
November 202587%30
December 202573%30
January 202695%21
February 202684%25
May 202676%29
Departures on time
83%
Diverted
0.3%
Flights flown
292
Months covered
12

Same route, other flights

Keep nerding

Based on 297 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.