Flight number record
OO 4644
SkyWest Airlines · Charleston to Chicago
- Route
- CRW → ORD
- Departs
- 17:57
- Flights
- 292
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s OO 4644, check with SkyWest Airlines. SkyWest Airlines flies under contract for larger airlines, so a ticket for this flight may show a different airline code and number.
OO 4644 earns an F−, which is as low as this site's scale goes for a reason. Only 45.2% of flights arrive inside the 15-minute window, 32 points worse than the national rate of 77.3%. Late arrivals average an hour and a half. Treat any tight connection here as a coin flip. That rests on 292 flights, with a median arrival 19 minutes late.
The national on-time rate over the same period is 77.3%, so OO 4644 runs 32 points behind the country as a whole. Across a thousand flights that is about 321 extra late arrivals.
Key figures
On time
45.2%
Arrivals under 15 minutes late, of 272 completed flights
Avg delay
99 min
Across delayed arrivals only, not all flights
Cancelled
5.82%
National rate is 1.89%
1 hour+ late
23.9%
National rate is 8.3%
These figures cover 292 flights between September 2025 and August 2026. Beyond the headline rate, 23.9% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When OO 4644 flies
OO 4644 flies CRW to ORD without a single fixed slot. Its most common scheduled departure was 17:57, used on 80 of 292 flights, with 17:45 (60 flights) and 17:35 (41 flights) next.
- Departs 17:5780 flights27.4%
- Departs 17:4560 flights20.5%
- Departs 17:3541 flights14.0%
Scale runs 0% to 100%.
Share of scheduled departures at each local time. Times used on fewer than one flight in ten are not listed.
A 17:57 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.0%, and OO 4644 runs 23 points worse at 45.2%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.
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Against the route
OO 4644 next to CRW to ORD
Every carrier on CRW to ORD combined arrived on time 64.3% of the time across 942 flights, so OO 4644 is 19 points behind it. Across its whole network SkyWest Airlines managed 78.7%, which this flight trails by 34 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| OO 4644thin sample | 292 | 45.2% | 99 min | 5.82% | F− |
| All SkyWest Airlines on CRW–ORD | 942 | 64.3% | 104 min | 3.93% | D− |
| All carriers on CRW–ORD | 942 | 64.3% | 104 min | 3.93% | D− |
| SkyWest Airlines, whole network | 855,406 | 78.7% | 88 min | 1.79% | B |
Across the year
OO 4644 quarter by quarter
OO 4644 did not run the same all year. Its best quarter was Apr–Jun 2026 at 55.9% on time and its weakest Oct–Dec 2025 at 31.9%, a swing of 24 points on roughly 58 flights a quarter. The twelve-month rate averages over that, so if you are flying in a weak quarter the quarter's own figure is the better guide.
- Jul–Sep 202530 flights40.0%
- Oct–Dec 202577 flights31.9%
- Jan–Mar 202682 flights48.0%
- Apr–Jun 202662 flights55.9%
- Jul–Sep 202641 flights52.8%
Scale runs 25% to 60%.
By weekday, OO 4644 did best on Sunday at 54.1% on time and worst on Wednesday at 36.6%. Each day rests on about 42 flights, so a gap of 18 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late OO 4644 runs when it is late
The 149 late arrivals split 43 under half an hour, 41 between 30 and 60 minutes, and 65 an hour or more.
- 15+ min early31 flights11.4%
- Within 15 min92 flights33.8%
- 15–29 min late43 flights15.8%
- 30–59 min late41 flights15.1%
- 1–2 hours late35 flights12.9%
- 2+ hours late30 flights11.0%
Scale runs 0% to 100%.
Share of 272 completed flights by arrival against schedule.
16 of 119 late departures made up the time and arrived on time, 13% of them. In the other direction, 46 flights left on time yet arrived 15 minutes late or more, so that delay built up after pushback: in the air, in a holding pattern or on the ground at ORD.
The worst days
Worst days for OO 4644
The latest arrival of the period was on 3 February 2026, 21 hours 9 minutes behind schedule; most of its delay minutes were filed as extreme weather. The five worst days are spread across February, December and October, with no single month standing out.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 3 February 2026 | 21 hours 9 minutes | Extreme weather |
| 8 December 2025 | 15 hours 54 minutes | National Airspace System |
| 6 October 2025 | 15 hours 39 minutes | Carrier |
| 29 October 2025 | 7 hours 2 minutes | Late-arriving aircraft |
| 2 February 2026 | 5 hours 49 minutes | Late-arriving aircraft |
Delay causes
Why OO 4644 runs late
Carriers report a reason for every delay minute they cause, in five DOT categories. The split below is by minutes, not by number of flights, so a handful of very long weather delays weighs as much as many short ones. It covers 15,000 reported delay minutes.
- 33%Late-arriving aircraft
- 30%National Airspace System
- 25%Carrier
- 13%Extreme weather
Extreme weather accounts for 13% of delay minutes, well above the single-digit share typical across the system. Weather delays are lumpy: they arrive as whole bad days rather than as a steady drag, so the quarterly figures above are the more useful view of the risk. The national share is 6%, so this operation carries roughly 2.1 times the usual weather exposure. The split is drawn from 14,689 delay minutes reported on OO 4644.
Cancellations run at 5.82%, against 1.89% nationally. That is roughly one flight in fifteen cancelled outright. A cancelled flight is invisible in every on-time figure on this page, so the punctuality numbers above describe only the flights that actually operated.
Connections and routes
What a delay on this flight costs
23.9% of arrivals land a full hour or more behind schedule, against 8.3% nationally. Ninety minutes is the honest minimum for a connection here, and two hours if the onward flight is on a separate ticket.
The same number turns up on four other city pairs in the data, including ATW to ORD (32), IAH to OMA (21) and ABQ to SFO (19), but none flew often enough under OO 4644 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to CRW to ORD only.
One caution: this is a thin sample. 292 flights over twelve months is enough to clear this site's floor but not enough to pin the rate down tightly, and a single bad week moves it by more than a point. Treat the grade as a rough reading.
What to do with this
Booking OO 4644
For a booking, the cancellation rate is the figure to plan around on OO 4644: 5.82% of its 292 scheduled flights did not operate. A late arrival costs an hour and a half, but a cancellation costs the day, so leave a later option open.
Related
Where to go next
- CRW to ORD, every carrier and departure
- ORD to CRW, the return direction
- SkyWest Airlines 5801 on the same route73.6%
- Chicago O'Hare International (ORD) delay statistics
- SkyWest Airlines on-time record
- Every SkyWest Airlines flight number with a record
- The most and least reliable flight numbers in the US
- Why the first flight of the morning is statistically safest
A flight number here means SkyWest Airlines’s own number as it reports to the DOT. How the figures are computed is on the methodology page.
Source: US DOT Bureau of Transportation Statistics, on-time performance data, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.