Flight number record

OO 4651

SkyWest Airlines · Moline to Chicago

Route: MLI → ORD
Departs: 10:47
Flights: 255
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s OO 4651, 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 4651 sits in the middle of the pack with a C−. Close to three flights in four arrive on time by the DOT's definition, 4 points worse than the national rate of 77.6%. The late ones land close to two hours behind schedule. That rests on 255 flights, with a median arrival 7 minutes early.

The national on-time rate over the same period is 77.6%, so OO 4651 runs 4 points behind the country as a whole. Across a thousand flights that is about 41 extra late arrivals.

On time

73.5%

Arrivals under 15 minutes late, of 245 completed flights

Avg delay

121 min

Across delayed arrivals only, not all flights

Cancelled

3.92%

National rate is 1.81%

1 hour+ late

15.1%

National rate is 8.1%

These figures cover 255 flights between July 2025 and June 2026. Beyond the headline rate, 15.1% 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 4651 flies

OO 4651 flies MLI to ORD without a single fixed slot. Its most common scheduled departure was 10:47, used on 55 of 255 flights, with 10:50 (53 flights) and 10:59 (49 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 10:4755 flights21.6%
Departs 10:5053 flights20.8%
Departs 10:5949 flights19.2%

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 10:47 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 84.1%, and OO 4651 runs 11 points worse at 73.5%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.

Against the route

OO 4651 next to MLI to ORD

Every carrier on MLI to ORD combined arrived on time 71.5% of the time across 2,191 flights, so OO 4651 is 2 points ahead of it. SkyWest flew 1,557 flights on the same city pair under all its flight numbers, including this one, and those ran 70.4% on time. Across its whole network SkyWest Airlines managed 79.0%, which this flight trails by 6 points.

OO 4651 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
OO 4651thin sample	255	73.5%	121 min	3.92%	C−
All SkyWest Airlines on MLI–ORD	1,557	70.4%	114 min	5.59%	C−
All carriers on MLI–ORD	2,191	71.5%	102 min	4.88%	C−
SkyWest Airlines, whole network	852,935	79.0%	88 min	1.77%	B

Across the year

OO 4651 quarter by quarter

Quarter by quarter OO 4651 held fairly steady: 79.2% in Jul–Sep 2025, 71.9% in Oct–Dec 2025, 73.6% in Jan–Mar 2026 and 69.6% in Apr–Jun 2026. A spread of 10 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.

Jul–Sep 202549 flights79.2%
Oct–Dec 202567 flights71.9%
Jan–Mar 202689 flights73.6%
Apr–Jun 202650 flights69.6%

Scale runs 60% to 85%. Rows with fewer than 30 flights show a dash.

By weekday, OO 4651 did best on Thursday at 82.4% on time and worst on Saturday at 62.9%. Each day rests on about 36 flights, so a gap of 20 points is worth noticing but could still narrow in another year.

Delay causes

Why OO 4651 runs late

One category carries most of the weight here. Late-arriving aircraft accounts for 50% of the 7,894 delay minutes carriers reported, and the remaining four split what is left. The split is by minutes rather than by flights, so a few very long delays count for as much as many short ones.

Late-arriving aircraft
50%
National Airspace System
23%
Carrier
19%
Extreme weather
9%

50% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. That is a cascade, and cascades start small and grow through the day. Across 7,894 reported delay minutes here, that single category outweighs weather by 6 to one. It is the strongest argument for booking the first departure of the morning, when the aircraft has been sitting at the gate overnight with nothing to inherit. The split is drawn from 7,894 delay minutes reported on OO 4651.

Cancellations run at 3.92%, against 1.81% nationally. That is about one flight in 25 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. 15.1% 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 eight other city pairs in the data, including AVL to ORD (40), ALB to ORD (26) and CID to ORD (26), but none flew often enough under OO 4651 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to MLI to ORD only.

One caution: this is a thin sample. 255 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 4651

For a booking, the cancellation rate is the figure to plan around on OO 4651: 3.92% of its 255 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