Flight number record

OO 5799

SkyWest Airlines · Milwaukee to Chicago

Route: MKE → ORD
Departs: 05:00
Flights: 322
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s OO 5799, 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 5799 earns a B. More than four flights in five arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 6 points better than the national rate of 77.6%. When something does go wrong the average delay runs an hour and a half. That rests on 322 flights, with a median arrival 19 minutes early.

Set against the rest of the country, OO 5799's record is 6 points better than the US average of 77.6%. That gap is worth roughly 64 fewer late arrivals for every thousand flights.

On time

84.0%

Arrivals under 15 minutes late, of 312 completed flights

Avg delay

85 min

Across delayed arrivals only, not all flights

Cancelled

2.80%

National rate is 1.81%

1 hour+ late

7.4%

National rate is 8.1%

These figures cover 322 flights between July 2025 and June 2026. The median arrival is 19 minutes early, which is the part an average hides: most flights here are fine, and the on-time rate is decided by a tail of badly late ones. On-time means under 15 minutes late, the DOT's own threshold.

Schedule

When OO 5799 flies

OO 5799 flies MKE to ORD without a single fixed slot. Its most common scheduled departure was 05:00, used on 219 of 322 flights, with 05:15 (69 flights) and 05:10 (34 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 05:00219 flights68.0%
Departs 05:1569 flights21.4%
Departs 05:1034 flights10.6%

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 05:00 departure sits in the 5am–8am window. Across every US flight scheduled in that window the on-time rate is 89.3%, and OO 5799 runs 5 points worse at 84.0%. 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 5799 next to MKE to ORD

Every carrier on MKE to ORD combined arrived on time 67.4% of the time across 5,202 flights, so OO 5799 is 17 points ahead of it. SkyWest flew 4,932 flights on the same city pair under all its flight numbers, including this one, and those ran 67.3% on time. Across its whole network SkyWest Airlines managed 79.0%, which this flight beats by 5 points.

OO 5799 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
OO 5799thin sample	322	84.0%	85 min	2.80%	B
All SkyWest Airlines on MKE–ORD	4,932	67.3%	94 min	4.12%	C−
All carriers on MKE–ORD	5,202	67.4%	94 min	4.33%	C−
SkyWest Airlines, whole network	852,935	79.0%	88 min	1.77%	B

Across the year

OO 5799 quarter by quarter

OO 5799 did not run the same all year. Its best quarter was Jul–Sep 2025 at 90.0% on time and its weakest Jan–Mar 2026 at 79.8%, a swing of 10 points on roughly 81 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 202592 flights90.0%
Oct–Dec 202591 flights82.2%
Jan–Mar 202688 flights79.8%
Apr–Jun 202651 flights83.3%

Scale runs 70% to 95%. Rows with fewer than 30 flights show a dash.

By weekday, OO 5799 did best on Friday at 90.9% on time and worst on Monday at 73.3%. Each day rests on about 46 flights, so a gap of 18 points is worth noticing but could still narrow in another year.

Delay causes

Why OO 5799 runs late

One category carries most of the weight here. Carrier accounts for 73% of the 4,255 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.

Carrier
73%
Extreme weather
13%
Late-arriving aircraft
10%
National Airspace System
4%

Extreme weather accounts for 13% of delay minutes, well above the single-digit share typical across the system. Weather delays are lumpy: they arrive as whole bad days rather than as a steady drag, so the quarterly figures above are the more useful view of the risk. The national share is 6%, so this operation carries roughly 2.0 times the usual weather exposure. The split is drawn from 4,255 delay minutes reported on OO 5799.

Cancellations run at 2.80%, against 1.81% nationally. That is roughly one flight in 40 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

7.4% of arrivals land an hour or more late, close to the national 8.1%. That is the figure that decides a connection, and it says a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last an hour and a half, which a normal layover absorbs.

The same number turns up on one other city pair in the data, including FCA to DEN (3), but none flew often enough under OO 5799 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to MKE to ORD only.

One caution: this is a thin sample. 322 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 5799

For a booking, the cancellation rate is the figure to plan around on OO 5799: 2.80% of its 322 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.

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