Flight number record

OO 4644

SkyWest Airlines · Charleston to Chicago

Route: CRW → ORD
Departs: 17:45
Flights: 312
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 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 41.7% of flights arrive inside the 15-minute window, 36 points worse than the national rate of 77.6%. Late arrivals average close to two hours. Treat any tight connection here as a coin flip. That rests on 312 flights, with a median arrival 21 minutes late.

The national on-time rate over the same period is 77.6%, so OO 4644 runs 36 points behind the country as a whole. Across a thousand flights that is about 359 extra late arrivals.

On time

41.7%

Arrivals under 15 minutes late, of 295 completed flights

Avg delay

105 min

Across delayed arrivals only, not all flights

Cancelled

4.81%

National rate is 1.81%

1 hour+ late

24.7%

National rate is 8.1%

These figures cover 312 flights between July 2025 and June 2026. Beyond the headline rate, 24.7% of arrivals land a full hour or more behind schedule. That is the number that wrecks a connection, and it is not visible in an on-time percentage alone.

Schedule

When OO 4644 flies

OO 4644 flies CRW to ORD without a single fixed slot. Its most common scheduled departure was 17:45, used on 73 of 312 flights, with 17:26 (48 flights) and 17:35 (41 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 17:4573 flights23.4%
Departs 17:2648 flights15.4%
Departs 17:3541 flights13.1%

Scale runs 0% to 100%. Rows with fewer than 30 flights show a dash.

Share of scheduled departures at each local time. Times used on fewer than one flight in ten are not listed.

A 17:45 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.2%, and OO 4644 runs 27 points worse at 41.7%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.

Against the route

OO 4644 next to CRW to ORD

Every carrier on CRW to ORD combined arrived on time 64.8% of the time across 947 flights, so OO 4644 is 23 points behind it. Across its whole network SkyWest Airlines managed 79.0%, which this flight trails by 37 points.

OO 4644 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
OO 4644thin sample	312	41.7%	105 min	4.81%	F−
All SkyWest Airlines on CRW–ORD	947	64.8%	102 min	3.38%	D−
All carriers on CRW–ORD	947	64.8%	102 min	3.38%	D−
SkyWest Airlines, whole network	852,935	79.0%	88 min	1.77%	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 78 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 202591 flights34.8%
Oct–Dec 202577 flights31.9%
Jan–Mar 202682 flights48.0%
Apr–Jun 202662 flights55.9%

Scale runs 25% to 60%. Rows with fewer than 30 flights show a dash.

By weekday, OO 4644 did best on Thursday at 47.6% on time and worst on Wednesday at 31.8%. Each day rests on about 45 flights, so a gap of 16 points is worth noticing but could still narrow in another year.

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 18,000 reported delay minutes.

Late-arriving aircraft
38%
National Airspace System
30%
Carrier
21%
Extreme weather
11%

Extreme weather accounts for 11% 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 1.8 times the usual weather exposure. The split is drawn from 17,983 delay minutes reported on OO 4644.

Cancellations run at 4.81%, against 1.81% nationally. That is about one flight in twenty 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

For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 24.7% of arrivals land a full hour or more behind schedule, against 8.1% nationally. A 45-minute layover does not survive that, and no amount of walking quickly changes it. Ninety minutes is the honest minimum 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), ABQ to SFO (19) and DSM to ORD (1), 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. 312 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: 4.81% of its 312 scheduled flights did not operate. A late arrival costs close to two hours, but a cancellation costs the day, so leave a later option open.

Where to go next

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, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.

Key figures