Flight number record
OO 5436
SkyWest Airlines · Fort Wayne to Chicago
- Route
- FWA → ORD
- Departs
- 16:45
- Flights
- 364
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s OO 5436, 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 5436 earns an F−, which is as low as this site's scale goes for a reason. Only 54.9% of flights arrive inside the 15-minute window, 22 points worse than the national rate of 77.3%. Late arrivals average an hour and a half. Treat any tight connection here as a coin flip. That rests on 364 flights, with a median arrival 9 minutes late.
The national on-time rate over the same period is 77.3%, so OO 5436 runs 22 points behind the country as a whole. Across a thousand flights that is about 224 extra late arrivals.
Key figures
On time
54.9%
Arrivals under 15 minutes late, of 344 completed flights
Avg delay
98 min
Across delayed arrivals only, not all flights
Cancelled
4.67%
National rate is 1.89%
1 hour+ late
20.6%
National rate is 8.3%
These figures cover 364 flights between September 2025 and August 2026. Beyond the headline rate, 20.6% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When OO 5436 flies
OO 5436 flies FWA to ORD without a single fixed slot. Its most common scheduled departure was 16:45, used on 164 of 364 flights, with 16:44 (127 flights) and 16:50 (52 flights) next.
- Departs 16:45164 flights45.1%
- Departs 16:44127 flights34.9%
- Departs 16:5052 flights14.3%
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 16:45 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 71.9%, and OO 5436 runs 17 points worse at 54.9%. 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 5436 next to FWA to ORD
Every carrier on FWA to ORD combined arrived on time 68.1% of the time across 2,812 flights, so OO 5436 is 13 points behind it. SkyWest flew 2,584 flights on the same city pair under all its flight numbers, including this one, and those ran 67.6% on time. Across its whole network SkyWest Airlines managed 78.7%, which this flight trails by 24 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| OO 5436thin sample | 364 | 54.9% | 98 min | 4.67% | F− |
| All SkyWest Airlines on FWA–ORD | 2,584 | 67.6% | 106 min | 4.45% | C− |
| All carriers on FWA–ORD | 2,812 | 68.1% | 104 min | 4.45% | C− |
| SkyWest Airlines, whole network | 855,406 | 78.7% | 88 min | 1.79% | B |
Across the year
OO 5436 quarter by quarter
OO 5436 did not run the same all year. Its best quarter was Jul–Sep 2025 at 63.3% on time and its weakest Apr–Jun 2026 at 43.0%, a swing of 20 points on roughly 73 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 flights63.3%
- Oct–Dec 202591 flights62.4%
- Jan–Mar 202690 flights57.6%
- Apr–Jun 202691 flights43.0%
- Jul–Sep 202662 flights53.4%
Scale runs 35% to 70%.
By weekday, OO 5436 did best on Tuesday at 64.7% on time and worst on Friday at 40.0%. Each day rests on about 52 flights, so a gap of 25 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late OO 5436 runs when it is late
The 155 late arrivals split 54 under half an hour, 30 between 30 and 60 minutes, and 71 an hour or more.
- 15+ min early43 flights12.5%
- Within 15 min146 flights42.4%
- 15–29 min late54 flights15.7%
- 30–59 min late30 flights8.7%
- 1–2 hours late23 flights6.7%
- 2+ hours late48 flights14.0%
Scale runs 0% to 100%.
Share of 344 completed flights by arrival against schedule.
Time lost at the gate mostly stays lost. Of 127 departures that left 15 minutes late or more, only 9 made it up before arrival. In the other direction, 37 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 ORD.
The worst days
Worst days for OO 5436
The latest arrival of the period was on 12 April 2026, 7 hours 44 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). Three of the five worst days fell in April 2026.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 12 April 2026 | 7 hours 44 minutes | Carrier |
| 17 April 2026 | 7 hours 38 minutes | Extreme weather |
| 7 April 2026 | 7 hours 21 minutes | Carrier |
| 19 February 2026 | 6 hours 15 minutes | Late-arriving aircraft |
| 2 December 2025 | 6 hours 4 minutes | Late-arriving aircraft |
Delay causes
Why OO 5436 runs late
Late-arriving aircraft accounts for 44% of the 15,000 delay minutes carriers reported here, and the remaining four split what is left.
- 44%Late-arriving aircraft
- 28%National Airspace System
- 20%Carrier
- 7%Extreme weather
44% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 15,000 reported delay minutes here, that single category outweighs weather by 6 to one. The split is drawn from 15,222 delay minutes reported on OO 5436.
Cancellations run at 4.67%, 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
20.6% 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.
Every one of the 364 flights under OO 5436 in the data flew FWA to ORD. The number was not reused on any other city pair, which makes this a clean record of one route.
One caution: this is a thin sample. 364 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 5436
For a booking, the cancellation rate is the figure to plan around on OO 5436: 4.67% of its 364 scheduled flights did not operate. A late arrival costs an hour and a half, but a cancellation costs the day, so leave a later option open.
Related
Where to go next
- FWA to ORD, every carrier and departure
- ORD to FWA, the return direction
- SkyWest Airlines 4784 on the same route67.0%
- SkyWest Airlines 5466 on the same route50.0%
- 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
- Why the first flight of the morning is statistically safest
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.