Flight number record

OO 5436

SkyWest Airlines · Fort Wayne to Chicago

Route: FWA → ORD
Departs: 16:45
Flights: 363
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 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 a D−, which is as low as this site's scale goes for a reason. Only 55.0% of flights arrive inside the 15-minute window, 23 points worse than the national rate of 77.6%. Late arrivals average close to two hours. Treat any tight connection here as a coin flip. That rests on 363 flights, with a median arrival 9 minutes late.

The national on-time rate over the same period is 77.6%, so OO 5436 runs 23 points behind the country as a whole. Across a thousand flights that is about 226 extra late arrivals.

On time

55.0%

Arrivals under 15 minutes late, of 342 completed flights

Avg delay

104 min

Across delayed arrivals only, not all flights

Cancelled

4.68%

National rate is 1.81%

1 hour+ late

22.8%

National rate is 8.1%

These figures cover 363 flights between July 2025 and June 2026. Beyond the headline rate, 22.8% 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 5436 flies

OO 5436 flies FWA to ORD without a single fixed slot. Its most common scheduled departure was 16:45, used on 177 of 363 flights, with 16:44 (86 flights) and 16:50 (52 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 16:45177 flights48.8%
Departs 16:4486 flights23.7%
Departs 16:5052 flights14.3%

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 16:45 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 72.4%, and OO 5436 runs 17 points worse at 55.0%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.

Against the route

OO 5436 next to FWA to ORD

Every carrier on FWA to ORD combined arrived on time 66.2% of the time across 2,695 flights, so OO 5436 is 11 points behind it. SkyWest flew 2,361 flights on the same city pair under all its flight numbers, including this one, and those ran 65.6% on time. Across its whole network SkyWest Airlines managed 79.0%, which this flight trails by 24 points.

OO 5436 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
OO 5436thin sample	363	55.0%	104 min	4.68%	D−
All SkyWest Airlines on FWA–ORD	2,361	65.6%	105 min	4.62%	C−
All carriers on FWA–ORD	2,695	66.2%	102 min	4.56%	C−
SkyWest Airlines, whole network	852,935	79.0%	88 min	1.77%	B

Across the year

OO 5436 quarter by quarter

OO 5436 did not run the same all year. Its best quarter was Oct–Dec 2025 at 62.4% on time and its weakest Apr–Jun 2026 at 43.0%, a swing of 19 points on roughly 91 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 202591 flights57.0%
Oct–Dec 202591 flights62.4%
Jan–Mar 202690 flights57.6%
Apr–Jun 202691 flights43.0%

Scale runs 35% to 70%. Rows with fewer than 30 flights show a dash.

By weekday, OO 5436 did best on Tuesday at 64.7% on time and worst on Sunday at 40.4%. Each day rests on about 52 flights, so a gap of 24 points is worth noticing but could still narrow in another year.

Delay causes

Why OO 5436 runs late

One category carries most of the weight here. Late-arriving aircraft accounts for 45% of the 16,000 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
45%
National Airspace System
27%
Carrier
21%
Extreme weather
7%

45% 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 16,000 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 15,953 delay minutes reported on OO 5436.

Cancellations run at 4.68%, against 1.81% 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

For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 22.8% 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.

Every one of the 363 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. 363 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: 4.68% of its 363 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