Flight profile · SkyWest Airlines
OO4636
Chicago (ORD) to South Bend (SBN) · scheduled 5:55 PM – 7:52 PM
How OO4636 performs
1,015 operations, 2023-07-01 to 2026-06-30.
OO4636 arrived on time 63.5% of the time, against 69.0% for all ORD → SBN flights — this specific departure is 5.5 percentage points worse than the route as a whole. Against SkyWest Airlines’s own flights on this route it is 5.4 points worse.
Source: US DOT Bureau of Transportation Statistics · 1,015 operations between 2023-07-01 to 2026-06-30
Against the rest of the route
| On time | Cancelled | Median delay | Severe | Flights | |
|---|---|---|---|---|---|
| OO4636 | 63.5% | 3.45% | 1 min | 17.6% | 1,015 |
| SkyWest Airlines on ORD → SBN | 68.9% | 2.88% | -1 min | 13.6% | 6,697 |
| All ORD → SBN flights | 69.0% | 2.86% | -1 min | 13.5% | 6,747 |
Source: FlyerIntel analysis of US DOT BTS data · 2023-07-01 to 2026-06-30
By day of week
Does OO4636 run worse on particular days?
Monday is historically the most reliable day and Sunday the least, a gap of 15.2 percentage points.
Source: FlyerIntel analysis of US DOT BTS data · 2023-07-01 to 2026-06-30 · Days with fewer than 120 operations are not scored.
Other routes OO4636 has flown
A flight number is a slot in a schedule, and carriers reassign it. These are the other city pairs this number served in the analysis period.
| Route | Operated | Flights | On time |
|---|---|---|---|
| OMA→ORD Omaha to Chicago | 2025-11-08 – 2025-11-08 | 1 | — |
| ORD→ABE Chicago to Allentown/Bethlehem | 2025-09-25 – 2025-10-25 | 31 | — |
| DEN→IDA Denver to Idaho Falls | 2024-12-03 – 2024-12-18 | 16 | — |
| DEN→BOI Denver to Boise | 2024-11-28 – 2024-11-28 | 1 | — |
| IAH→OKC Houston to Oklahoma City | 2024-10-05 – 2024-10-26 | 4 | — |
| SGF→ORD Springfield to Chicago | 2024-10-01 – 2024-10-25 | 22 | — |
| DEN→BFL Denver to Bakersfield | 2023-11-23 – 2023-11-23 | 1 | — |
| CLE→ORD Cleveland to Chicago | 2023-07-03 – 2023-07-04 | 2 | — |
Because the same number has served different journeys, the statistics above describe only the route OO4636 currently operates. Blending them would produce an average of two different flights.
Why OO4636 runs late
Where US DOT attributed the delay minutes on this flight.
crew, maintenance, boarding, fuelling — within the carrier’s control
the inbound aircraft was late, so this flight started late
airspace and airport capacity, including weather-driven flow control
weather severe enough to stop this flight specifically
screening or terminal security incidents
Share of the delay minutes US DOT attributed to each cause for OO4636 on ORD → SBN. A single late flight can carry more than one cause, and only delays of fifteen minutes or more are attributed at all.
Other departures on ORD → SBN
Same airports, same journey — and not the same odds of arriving on time.
| Flight | Airline | On time | Median arrival | Operations |
|---|---|---|---|---|
| OO4791 | SkyWest Airlines | 73.1% | 5 min early | 974 |
| OO5564 | SkyWest Airlines | 70.5% | 0 min early | 716 |
| OO5274 | SkyWest Airlines | 70.0% | 0 min early | 729 |
| OO5499 | SkyWest Airlines | 62.5% | 4 min late | 722 |
Every departure listed carries at least 600 operations, so the comparison is between figures that mean something. Schedules change; confirm the departure still operates before booking around this.
Data and methodology
Calculated by FlyerIntel from 1,015 records of OO4636 operating ORD → SBN, published by the US DOT Bureau of Transportation Statistics. A flight counts as delayed when it arrives 15 or more minutes after schedule. Cancelled and diverted flights are excluded from the on-time rate and reported separately. Flight numbers are resolved as carrier plus number plus route, because the same number serves different routes over time.