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Flight Reliability

UA 5921 · United Airlines

Knoxville → Chicago (TYS–ORD)83% of its flights flew this route. The rest (ORD–AVP, SFO–SBA) are included in these numbers.

69
Usually Fine
WanderNerd Reliability Score
76%
Arrive within 15 minutes
17 min
Average arrival delay
2.4%
Cancelled
9 min early
Median arrival delay

Based on 286 historical flights. Data through May 2026.

What the data says

Morning flights do better here.

UA 5921 departing between 9 AM–12 PM arrived on time 81% of the time, versus 40% between 9 PM–12 AM.

Friday is doing you no favors.

UA 5921 arrived on time 82% of the time on Tuesdays and just 63% on Fridays. That gap is worth planning around.

A bit ahead of the TYS–ORD route.

UA 5921 arrived on time 76% of the time, versus 69% across the TYS–ORD route.

A bit behind the United Airlines network.

UA 5921 arrived on time 76% of the time, versus 79% across the United Airlines network.

The breakdown

On-time by weekday
  • Mon76%(42 flights)
  • Tue82%(38 flights)
  • Wed79%(38 flights)
  • Thu79%(43 flights)
  • Fri63%(41 flights)
  • Sat79%(33 flights)
  • Sun74%(43 flights)
On-time by departure window
  • 6–9 AM70%(10 flights)
  • 9 AM–12 PM81%(233 flights)
  • 3–6 PM45%(20 flights)
  • 9 PM–12 AM40%(15 flights)
On-time trend by month
52%
May

Jun 97% → May 52% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202597%30
July 202583%30
August 202587%31
September 202594%18
October 2025100%30
November 202574%27
December 202539%13
February 202665%17
March 202642%24
April 202681%26
May 202652%29
Departures on time
76%
Diverted
0.3%
Flights flown
278
Months covered
12

Same route, other flights

Keep nerding

Based on 286 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.