Flight number record

OO 4645

SkyWest Airlines · Chicago to Fort Wayne

Route: ORD → FWA
Departs: 10:55
Flights: 278
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s OO 4645, 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 4645 sits in the middle of the pack with a C−. About seven flights in ten arrive on time by the DOT's definition, 8 points worse than the national rate of 77.6%. The late ones land a little over an hour behind schedule. That rests on 278 flights, with a median arrival 2 minutes early.

The national on-time rate over the same period is 77.6%, so OO 4645 runs 8 points behind the country as a whole. Across a thousand flights that is about 82 extra late arrivals.

On time

69.4%

Arrivals under 15 minutes late, of 268 completed flights

Avg delay

73 min

Across delayed arrivals only, not all flights

Cancelled

3.24%

National rate is 1.81%

1 hour+ late

12.7%

National rate is 8.1%

These figures cover 278 flights between July 2025 and June 2026. Beyond the headline rate, 12.7% 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 4645 flies

OO 4645 flies ORD to FWA without a single fixed slot. Its most common scheduled departure was 10:55, used on 48 of 278 flights, with 11:05 (46 flights) and 10:46 (37 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 10:5548 flights17.3%
Departs 11:0546 flights16.5%
Departs 10:4637 flights13.3%

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 10:55 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 84.1%, and OO 4645 runs 15 points worse at 69.4%. 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 4645 next to ORD to FWA

Every carrier on ORD to FWA combined arrived on time 63.8% of the time across 2,699 flights, so OO 4645 is 6 points ahead of it. SkyWest flew 2,366 flights on the same city pair under all its flight numbers, including this one, and those ran 63.1% on time. Across its whole network SkyWest Airlines managed 79.0%, which this flight trails by 10 points.

OO 4645 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
OO 4645thin sample	278	69.4%	73 min	3.24%	C−
All SkyWest Airlines on ORD–FWA	2,366	63.1%	83 min	4.27%	D−
All carriers on ORD–FWA	2,699	63.8%	82 min	4.22%	D−
SkyWest Airlines, whole network	852,935	79.0%	88 min	1.77%	B

Across the year

OO 4645 quarter by quarter

OO 4645 did not run the same all year. Its best quarter was Jul–Sep 2025 at 84.5% on time and its weakest Oct–Dec 2025 at 58.0%, a swing of 27 points on roughly 70 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 202586 flights84.5%
Oct–Dec 202552 flights58.0%
Jan–Mar 202684 flights66.2%
Apr–Jun 202656 flights61.1%

Scale runs 50% to 90%. Rows with fewer than 30 flights show a dash.

By weekday, OO 4645 did best on Sunday at 76.3% on time and worst on Friday at 57.9%. Each day rests on about 40 flights, so a gap of 18 points is worth noticing but could still narrow in another year.

Delay causes

Why OO 4645 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 6,000 reported delay minutes.

Carrier
36%
National Airspace System
33%
Late-arriving aircraft
26%
Extreme weather
5%

The largest share of delay minutes, 36%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. Unlike weather, that is a management outcome, and it is the category where the gap between two carriers on the same schedule is genuinely earned. It accounts for 2,161 of the 6,000 delay minutes reported here. The split is drawn from 6,000 delay minutes reported on OO 4645.

Cancellations run at 3.24%, against 1.81% nationally. That is about one flight in 30 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. 12.7% 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 three other city pairs in the data, including ATW to ORD (48), COS to DEN (36) and IAH to BWI (1), but none flew often enough under OO 4645 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to ORD to FWA only.

One caution: this is a thin sample. 278 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 4645

For a booking, the cancellation rate is the figure to plan around on OO 4645: 3.24% of its 278 scheduled flights did not operate. A late arrival costs a little over an hour, 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