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Flight Reliability

UA 5140 · United Airlines

Chicago → CMX (ORD–CMX)100% of its flights flew this route. The rest (GRB–CMX) are included in these numbers.

10
Bring Snacks
WanderNerd Reliability Score
61%
Arrive within 15 minutes
63 min
Average arrival delay
5.5%
Cancelled
5 min
Median arrival delay

Based on 365 historical flights. Data through May 2026.

What the data says

Friday is doing you no favors.

UA 5140 arrived on time 66% of the time on Thursdays. On Fridays: 55%.

A bit behind the ORD–CMX route.

UA 5140 arrived on time 61% of the time, versus 68% across the ORD–CMX route.

Well behind the United Airlines network.

UA 5140 arrived on time 61% of the time, versus 79% across the United Airlines network.

Keep a backup plan handy.

UA 5140 was cancelled 5.5% of the time. Typical for U.S. flights is around 1–2%.

The breakdown

On-time by weekday
  • Mon62%(47 flights)
  • Tue63%(49 flights)
  • Wed60%(47 flights)
  • Thu66%(47 flights)
  • Fri55%(49 flights)
  • Sat65%(49 flights)
  • Sun57%(47 flights)
On-time by departure window
  • 3–6 PM—(2 flights)
  • 9 PM–12 AM61%(333 flights)
On-time trend by month
62%
May

Jun 48% → May 62% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202548%29
July 202550%30
August 202557%30
September 202585%26
October 202584%31
November 202580%25
December 202550%30
January 202668%28
February 202656%27
March 202639%26
April 202658%24
May 202662%29
Departures on time
65%
Diverted
2.7%
Flights flown
335
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.