Flight number record
OO 4645
SkyWest Airlines · Chicago to Fort Wayne
- Route
- ORD → FWA
- Departs
- 10:55
- Flights
- 278
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 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 draws a C−. About one flight in three arrives at least 15 minutes late, and the typical late arrival is a little over an hour behind schedule. Build slack into anything you connect to. That rests on 278 flights, with a median arrival right on schedule.
The national on-time rate over the same period is 77.3%, so OO 4645 runs 12 points behind the country as a whole. Across a thousand flights that is about 121 extra late arrivals.
Key figures
On time
65.2%
Arrivals under 15 minutes late, of 267 completed flights
Avg delay
70 min
Across delayed arrivals only, not all flights
Cancelled
3.60%
National rate is 1.89%
1 hour+ late
14.6%
National rate is 8.3%
These figures cover 278 flights between September 2025 and August 2026. Beyond the headline rate, 14.6% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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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 10:25 (47 flights) and 10:48 (36 flights) next.
- Departs 10:5548 flights17.3%
- Departs 10:2547 flights16.9%
- Departs 10:4836 flights12.9%
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 10:55 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 83.9%, and OO 4645 runs 19 points worse at 65.2%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.
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Against the route
OO 4645 next to ORD to FWA
Every carrier on ORD to FWA combined arrived on time 63.2% of the time across 2,815 flights, so OO 4645 is 2 points ahead of it. SkyWest flew 2,587 flights on the same city pair under all its flight numbers, including this one, and those ran 62.4% on time. Across its whole network SkyWest Airlines managed 78.7%, which this flight trails by 14 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| OO 4645thin sample | 278 | 65.2% | 70 min | 3.60% | C− |
| All SkyWest Airlines on ORD–FWA | 2,587 | 62.4% | 80 min | 4.56% | D− |
| All carriers on ORD–FWA | 2,815 | 63.2% | 79 min | 4.58% | D− |
| SkyWest Airlines, whole network | 855,406 | 78.7% | 88 min | 1.79% | B |
Across the year
OO 4645 quarter by quarter
Quarter by quarter OO 4645 held fairly steady: 58.0% in Oct–Dec 2025, 66.2% in Jan–Mar 2026, 61.1% in Apr–Jun 2026 and 65.0% in Jul–Sep 2026. A spread of 8 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.
- Jul–Sep 202524 flights—
- Oct–Dec 202552 flights58.0%
- Jan–Mar 202684 flights66.2%
- Apr–Jun 202656 flights61.1%
- Jul–Sep 202662 flights65.0%
Scale runs 50% to 70%. Rows with fewer than 30 flights show a dash.
By weekday, OO 4645 did best on Thursday at 73.0% on time and worst on Friday at 47.4%. Each day rests on about 40 flights, so a gap of 26 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late OO 4645 runs when it is late
The 93 late arrivals split 26 under half an hour, 28 between 30 and 60 minutes, and 39 an hour or more.
- 15+ min early45 flights16.9%
- Within 15 min129 flights48.3%
- 15–29 min late26 flights9.7%
- 30–59 min late28 flights10.5%
- 1–2 hours late26 flights9.7%
- 2+ hours late13 flights4.9%
Scale runs 0% to 100%.
Share of 267 completed flights by arrival against schedule.
Time lost at the gate mostly stays lost. Of 61 departures that left 15 minutes late or more, only 4 made it up before arrival. In the other direction, 36 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 FWA.
The worst days
Worst days for OO 4645
The latest arrival of the period was on 14 April 2026, 6 hours 28 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. The five worst days are spread across April, December, May, November and July, with no single month standing out.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 14 April 2026 | 6 hours 28 minutes | Late-arriving aircraft |
| 7 December 2025 | 4 hours 46 minutes | Carrier |
| 18 May 2026 | 3 hours 53 minutes | National Airspace System |
| 10 November 2025 | 3 hours 32 minutes | National Airspace System |
| 28 July 2026 | 3 hours 22 minutes | Late-arriving aircraft |
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 6,528 reported delay minutes.
- 41%Carrier
- 31%National Airspace System
- 21%Late-arriving aircraft
- 7%Extreme weather
The largest share of delay minutes, 41%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 2,692 of the 6,528 delay minutes reported here. The split is drawn from 6,528 delay minutes reported on OO 4645.
Cancellations run at 3.60%, against 1.89% 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
14.6% 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 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: 3.60% 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.
Related
Where to go next
- ORD to FWA, every carrier and departure
- FWA to ORD, the return direction
- SkyWest Airlines 5448 on the same route61.8%
- SkyWest Airlines 5309 on the same route57.9%
- SkyWest Airlines 5331 on the same route58.2%
- 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
- The best time of day to fly, according to 7.05 million flight records
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.