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Flight Reliability

UA 4324 · United Airlines

Knoxville → Washington (TYS–IAD)91% of its flights flew this route. The rest (LFT–IAH, MYR–IAD) are included in these numbers.

83
Pretty Reliable
WanderNerd Reliability Score
84%
Arrive within 15 minutes
2 min early
Average arrival delay
2.2%
Cancelled
15 min early
Median arrival delay

Based on 362 historical flights. Data through May 2026.

What the data says

The late departure is the smart one here.

UA 4324 departing between 6–9 PM arrived on time 85% of the time, versus 75% between 6–9 AM.

Friday is doing you no favors.

UA 4324 arrived on time 92% of the time on Sundays. On Fridays: 78%.

A bit ahead of the United Airlines network.

UA 4324 arrived on time 84% of the time, versus 79% across the United Airlines network.

Recent months have been rougher.

UA 4324 arrived on time 81% of the time over the last three months in the data, compared with 95% in the three months before that.

The breakdown

On-time by weekday
  • Mon80%(51 flights)
  • Tue79%(52 flights)
  • Wed88%(51 flights)
  • Thu84%(50 flights)
  • Fri78%(49 flights)
  • Sat86%(50 flights)
  • Sun92%(51 flights)
On-time by departure window
  • 6–9 AM75%(20 flights)
  • 9 AM–12 PM82%(11 flights)
  • 6–9 PM85%(323 flights)
On-time trend by month
77%
May

Jun 69% → May 77% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202569%29
July 202562%29
August 202584%31
September 202590%30
October 202597%31
November 202576%29
December 202594%31
January 202696%27
February 202696%27
March 202677%30
April 202690%29
May 202677%31
Departures on time
83%
Diverted
0%
Flights flown
354
Months covered
12

Same route, other flights

Keep nerding

Based on 362 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.