Flight profile · SkyWest Airlines
OO4644
Charleston (CRW) to Chicago (ORD) · scheduled 5:45 PM – 6:40 PM
How OO4644 performs
1,003 operations, 2023-07-01 to 2026-06-30.
OO4644 arrived on time 55.9% of the time, against 69.7% for all CRW → ORD flights — this specific departure is 13.8 percentage points worse than the route as a whole. Against SkyWest Airlines’s own flights on this route it is 13.8 points worse.
Source: US DOT Bureau of Transportation Statistics · 1,003 operations between 2023-07-01 to 2026-06-30
Against the rest of the route
| On time | Cancelled | Median delay | Severe | Flights | |
|---|---|---|---|---|---|
| OO4644 | 55.9% | 2.79% | 9 min | 19.3% | 1,003 |
| SkyWest Airlines on CRW → ORD | 69.7% | 2.23% | -2 min | 14.4% | 2,830 |
| All CRW → ORD flights | 69.7% | 2.23% | -2 min | 14.4% | 2,830 |
Source: FlyerIntel analysis of US DOT BTS data · 2023-07-01 to 2026-06-30
By day of week
Does OO4644 run worse on particular days?
Monday is historically the most reliable day and Thursday the least, a gap of 9.2 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 OO4644 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 |
|---|---|---|---|
| ATW→ORD Appleton to Chicago | 2026-03-29 – 2026-04-29 | 32 | — |
| ABQ→SFO Albuquerque to San Francisco | 2025-12-18 – 2026-01-05 | 19 | — |
| DSM→ORD Des Moines to Chicago | 2025-11-27 – 2025-11-27 | 1 | — |
| IAH→BNA Houston to Nashville | 2025-07-04 – 2025-07-04 | 1 | — |
| AUS→IAH Austin to Houston | 2025-03-08 – 2025-03-29 | 22 | — |
| DEN→AMA Denver to Amarillo | 2024-11-28 – 2024-11-28 | 1 | — |
| ORD→AVL Chicago to Asheville | 2024-07-04 – 2024-07-04 | 1 | — |
| DEN→COS Denver to Colorado Springs | 2023-11-23 – 2023-11-23 | 1 | — |
Because the same number has served different journeys, the statistics above describe only the route OO4644 currently operates. Blending them would produce an average of two different flights.
Why OO4644 runs late
Where US DOT attributed the delay minutes on this flight.
the inbound aircraft was late, so this flight started late
crew, maintenance, boarding, fuelling — within the carrier’s control
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 OO4644 on CRW → ORD. 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 CRW → ORD
Same airports, same journey — and not the same odds of arriving on time.
| Flight | Airline | On time | Median arrival | Operations |
|---|---|---|---|---|
| OO5801 | SkyWest Airlines | 79.0% | 7 min early | 983 |
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 1,003 records of OO4644 operating CRW → ORD, 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.
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