About 1 in 2 UA 5640 flights from Milwaukee arrived 15+ minutes late, diverted or cancelled over the past year (40%); 4.2% were cancelled. The typical flight landed 2 minutes late.
UA 5640: MKE → ORD
Scheduled to leave Milwaukee at 1:25 p.m. local time, operated by SkyWest as OO 5640. Over the past year it arrived on time 60% of the time (191 flights), in line with other UA flights on the route at that hour (60%). Last seen in the data Aug 31, 2026.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 27 | 63% |
| Tuesday | 28 | 57% |
| Wednesday | 28 | 71% |
| Thursday | 27 | 70% |
| Friday | 27 | 44% |
| Saturday | 27 | 59% |
| Sunday | 27 | 52% |
Why it was late
All flights MKE → ORD · Connecting off UA 5640? Check the risk
Questions
How often is UA 5640 from MKE to ORD late?
United Airlines 5640 from Milwaukee, WI to Chicago, IL arrived 15 or more minutes late, was diverted or was cancelled on 40% of 191 scheduled flights between September 2025 and August 2026. 4.2% were cancelled.
Flight numbers change. Figures cover flights with this airline, number and route only. "Likely range" is the 95% interval for the true on-time rate given the number of flights. This is history, not live status: check United Airlines for today's flight. Method.