About 5 in 10 UA 4636 flights from Chicago arrived 15+ minutes late, diverted or cancelled over the past year (51%); 6.8% were cancelled. The typical flight landed 10 minutes late.
UA 4636: ORD → SBN
Scheduled to leave Chicago at 5:50 p.m. local time, operated by SkyWest as OO 4636. Over the past year it arrived on time 49% of the time (309 flights), in line with other UA flights on the route at that hour (47%). Last seen in the data Aug 10, 2026.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 46 | 57% |
| Tuesday | 45 | 56% |
| Wednesday | 45 | 47% |
| Thursday | 43 | 58% |
| Friday | 44 | 36% |
| Saturday | 41 | 39% |
| Sunday | 45 | 49% |
Why it was late
All flights ORD → SBN · Connecting off UA 4636? Check the risk
Questions
How often is UA 4636 from ORD to SBN late?
United Airlines 4636 from Chicago, IL to South Bend, IN arrived 15 or more minutes late, was diverted or was cancelled on 51% of 309 scheduled flights between September 2025 and August 2026. 6.8% 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.