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Flight Reliability

UA 5555 · United Airlines

Chicago → Milwaukee (ORD–MKE)

26
Bring Snacks
WanderNerd Reliability Score
51%
Arrive within 15 minutes
45 min
Average arrival delay
3.6%
Cancelled
15 min
Median arrival delay

Based on 364 historical flights. Data through May 2026.

What the data says

The 3–6 PM departure wins.

UA 5555 departing between 3–6 PM arrived on time 53% of the time, versus 43% between 6–9 PM.

Sunday scaries are real for this one.

UA 5555 arrived on time 55% of the time on Thursdays. On Sundays: 40%.

Lagging the ORD–MKE route.

UA 5555 arrived on time 51% of the time, versus 64% across the ORD–MKE route.

Well behind the United Airlines network.

UA 5555 arrived on time 51% of the time, versus 79% across the United Airlines network.

The breakdown

On-time by weekday
  • Mon49%(51 flights)
  • Tue54%(50 flights)
  • Wed52%(52 flights)
  • Thu55%(47 flights)
  • Fri53%(49 flights)
  • Sat51%(49 flights)
  • Sun40%(52 flights)
On-time by departure window
  • 3–6 PM53%(275 flights)
  • 6–9 PM43%(75 flights)
On-time trend by month
65%
May

Jun 47% → May 65% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202547%30
July 202538%29
August 202562%29
September 202560%30
October 202568%31
November 202537%27
December 202545%31
January 202639%31
February 202654%28
March 202656%27
April 202635%26
May 202665%31
Departures on time
61%
Diverted
0.3%
Flights flown
350
Months covered
12

Same route, other flights

Keep nerding

Based on 364 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.