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Flight Reliability

UA 3598 · United Airlines

Chicago → Louisville (ORD–SDF)89% of its flights flew this route. The rest (BHM–ORD, STL–ORD) are included in these numbers.

73
Usually Fine
WanderNerd Reliability Score
78%
Arrive within 15 minutes
10 min
Average arrival delay
3.1%
Cancelled
7 min early
Median arrival delay

Based on 390 historical flights. Data through May 2026.

What the data says

The 12–3 PM departure wins.

UA 3598 departing between 12–3 PM arrived on time 95% of the time, versus 76% between 3–6 PM.

Sunday scaries are real for this one.

UA 3598 arrived on time 83% of the time on Thursdays. On Sundays: 72%.

Keep a backup plan handy.

UA 3598 was cancelled 3.1% of the time. Typical for U.S. flights is around 1–2%.

The breakdown

On-time by weekday
  • Mon77%(53 flights)
  • Tue80%(55 flights)
  • Wed77%(56 flights)
  • Thu83%(53 flights)
  • Fri78%(55 flights)
  • Sat75%(52 flights)
  • Sun72%(54 flights)
On-time by departure window
  • 9 AM–12 PM—(6 flights)
  • 12–3 PM95%(20 flights)
  • 3–6 PM76%(287 flights)
  • 6–9 PM77%(65 flights)
On-time trend by month
77%
May

Jun 90% → May 77% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202590%29
July 202567%30
August 202584%31
September 202592%50
October 202584%37
November 202564%25
December 202565%31
January 202679%29
February 202675%28
March 202662%29
April 202679%28
May 202677%31
Departures on time
83%
Diverted
0%
Flights flown
378
Months covered
12

Same route, other flights

Keep nerding

Based on 390 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.