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Flight Reliability

UA 4914 · United Airlines

Washington → Knoxville (IAD–TYS)

57
A Little Dicey
WanderNerd Reliability Score
71%
Arrive within 15 minutes
34 min
Average arrival delay
2.2%
Cancelled
7 min early
Median arrival delay

Based on 365 historical flights. Data through May 2026.

What the data says

The 3–6 PM departure wins.

UA 4914 departing between 3–6 PM arrived on time 80% of the time, versus 65% between 6–9 PM.

Sunday scaries are real for this one.

UA 4914 arrived on time 85% of the time on Wednesdays and just 57% on Sundays. That gap is worth planning around.

A bit behind the IAD–TYS route.

UA 4914 arrived on time 71% of the time, versus 78% across the IAD–TYS route.

Lagging the United Airlines network.

UA 4914 arrived on time 71% of the time, versus 79% across the United Airlines network.

The breakdown

On-time by weekday
  • Mon79%(52 flights)
  • Tue80%(50 flights)
  • Wed85%(52 flights)
  • Thu67%(52 flights)
  • Fri66%(50 flights)
  • Sat63%(49 flights)
  • Sun57%(51 flights)
On-time by departure window
  • 3–6 PM80%(144 flights)
  • 6–9 PM65%(212 flights)
On-time trend by month
61%
May

Jun 45% → May 61% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202545%29
July 202541%29
August 202565%31
September 202586%29
October 202577%31
November 202577%30
December 202555%31
January 202682%27
February 202685%27
March 202684%31
April 202697%30
May 202661%31
Departures on time
69%
Diverted
0.3%
Flights flown
356
Months covered
12

Same route, other flights

Keep nerding

Based on 365 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.