Flight number record
OO 5331
SkyWest Airlines · Chicago to Fort Wayne
- Route
- ORD → FWA
- Departs
- 15:35
- Flights
- 252
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s OO 5331, 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 5331 draws a D−. Roughly one flight in two 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 252 flights, with a median arrival 7 minutes late.
The national on-time rate over the same period is 77.3%, so OO 5331 runs 19 points behind the country as a whole. Across a thousand flights that is about 191 extra late arrivals.
Key figures
On time
58.2%
Arrivals under 15 minutes late, of 239 completed flights
Avg delay
72 min
Across delayed arrivals only, not all flights
Cancelled
4.76%
National rate is 1.89%
1 hour+ late
17.2%
National rate is 8.3%
These figures cover 252 flights between September 2025 and August 2026. Beyond the headline rate, 17.2% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When OO 5331 flies
OO 5331 flies ORD to FWA without a single fixed slot. Its most common scheduled departure was 15:35, used on 199 of 252 flights, with 15:40 (31 flights) next.
- Departs 15:35199 flights79.0%
- Departs 15:4031 flights12.3%
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 15:35 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 71.9%, and OO 5331 runs 14 points worse at 58.2%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.
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Against the route
OO 5331 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 5331 is 5 points behind 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 21 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| OO 5331thin sample | 252 | 58.2% | 72 min | 4.76% | D− |
| 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 5331 quarter by quarter
OO 5331 did not run the same all year. Its best quarter was Jul–Sep 2025 at 70.0% on time and its weakest Apr–Jun 2026 at 46.7%, a swing of 23 points on roughly 63 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 flights70.0%
- Oct–Dec 202589 flights59.3%
- Jan–Mar 202672 flights61.8%
- Apr–Jun 202661 flights46.7%
Scale runs 40% to 75%.
By weekday, OO 5331 did best on Thursday at 71.4% on time and worst on Monday at 52.6%. Each day rests on about 36 flights, so a gap of 19 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late OO 5331 runs when it is late
The 100 late arrivals split 36 under half an hour, 23 between 30 and 60 minutes, and 41 an hour or more.
- 15+ min early39 flights16.3%
- Within 15 min100 flights41.8%
- 15–29 min late36 flights15.1%
- 30–59 min late23 flights9.6%
- 1–2 hours late24 flights10.0%
- 2+ hours late17 flights7.1%
Scale runs 0% to 100%.
Share of 239 completed flights by arrival against schedule.
Time lost at the gate mostly stays lost. Of 65 departures that left 15 minutes late or more, only 3 made it up before arrival. In the other direction, 38 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 5331
The latest arrival of the period was on 7 December 2025, 6 hours 34 minutes behind schedule; most of its delay minutes were filed as national airspace system delay. On three of the five worst days the largest share was filed as a late-arriving aircraft.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 7 December 2025 | 6 hours 34 minutes | National Airspace System |
| 17 December 2025 | 5 hours 11 minutes | Carrier |
| 18 May 2026 | 4 hours 5 minutes | Late-arriving aircraft |
| 1 February 2026 | 3 hours 51 minutes | Late-arriving aircraft |
| 24 May 2026 | 3 hours 39 minutes | Late-arriving aircraft |
Delay causes
Why OO 5331 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 7,177 reported delay minutes.
- 36%Carrier
- 31%National Airspace System
- 30%Late-arriving aircraft
- 3%Extreme weather
The largest share of delay minutes, 36%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 2,552 of the 7,177 delay minutes reported here. The split is drawn from 7,177 delay minutes reported on OO 5331.
Cancellations run at 4.76%, against 1.89% 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
17.2% 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 ORD to RAP (41), FWA to ORD (29) and MKE to ORD (21), but none flew often enough under OO 5331 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. 252 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 5331
For a booking, the cancellation rate is the figure to plan around on OO 5331: 4.76% of its 252 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 4645 on the same route65.2%
- 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
- What a cancellation rate actually tells you (and what it hides)
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.