Flight number record

OO 5648

SkyWest Airlines · Milwaukee to Chicago

Route: MKE → ORD
Departs: 17:29
Flights: 253
Period: September 2025 to August 2026

Historical statistics for September 2025 to August 2026, not live status. For today’s OO 5648, 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 5648 earns an F−, which is as low as this site's scale goes for a reason. Only 52.3% of flights arrive inside the 15-minute window, 25 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 253 flights, with a median arrival 13 minutes late.

The national on-time rate over the same period is 77.3%, so OO 5648 runs 25 points behind the country as a whole. Across a thousand flights that is about 250 extra late arrivals.

On time

52.3%

Arrivals under 15 minutes late, of 239 completed flights

Avg delay

87 min

Across delayed arrivals only, not all flights

Cancelled

5.53%

National rate is 1.89%

1 hour+ late

19.2%

National rate is 8.3%

These figures cover 253 flights between September 2025 and August 2026. Beyond the headline rate, 19.2% of arrivals land a full hour or more behind schedule, against 8.3% nationally.

Fare search by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.

Schedule

When OO 5648 flies

OO 5648 flies MKE to ORD without a single fixed slot. Its most common scheduled departure was 17:29, used on 53 of 253 flights, with 19:15 (29 flights) and 17:37 (29 flights) next.

Departs 17:2953 flights20.9%
Departs 19:1529 flights11.5%
Departs 17:3729 flights11.5%

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 17:29 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.0%, and OO 5648 runs 16 points worse at 52.3%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.

Timetable by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.

Against the route

OO 5648 next to MKE to ORD

Every carrier on MKE to ORD combined arrived on time 68.4% of the time across 5,344 flights, so OO 5648 is 16 points behind it. SkyWest flew 5,046 flights on the same city pair under all its flight numbers, including this one, and those ran 68.3% on time. Across its whole network SkyWest Airlines managed 78.7%, which this flight trails by 26 points.

OO 5648 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
OO 5648thin sample	253	52.3%	87 min	5.53%	F−
All SkyWest Airlines on MKE–ORD	5,046	68.3%	94 min	4.22%	C−
All carriers on MKE–ORD	5,344	68.4%	93 min	4.38%	C−
SkyWest Airlines, whole network	855,406	78.7%	88 min	1.79%	B

Across the year

OO 5648 quarter by quarter

OO 5648 did not run the same all year. Its best quarter was Jul–Sep 2026 at 67.3% on time and its weakest Oct–Dec 2025 at 41.2%, a swing of 26 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 flights50.0%
Oct–Dec 202589 flights41.2%
Jan–Mar 20268 flights—
Apr–Jun 202669 flights55.4%
Jul–Sep 202657 flights67.3%

Scale runs 35% to 75%. Rows with fewer than 30 flights show a dash.

By weekday, OO 5648 did best on Saturday at 65.7% on time and worst on Thursday at 47.1%. 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 5648 runs when it is late

The 114 late arrivals split 39 under half an hour, 29 between 30 and 60 minutes, and 46 an hour or more.

15+ min early22 flights9.2%
Within 15 min103 flights43.1%
15–29 min late39 flights16.3%
30–59 min late29 flights12.1%
1–2 hours late22 flights9.2%
2+ hours late24 flights10.0%

Scale runs 0% to 100%.

Share of 239 completed flights by arrival against schedule.

Time lost at the gate mostly stays lost. Of 70 departures that left 15 minutes late or more, only 5 made it up before arrival. In the other direction, 49 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 5648

The latest arrival of the period was on 3 April 2026, 18 hours 31 minutes behind schedule; most of its delay minutes were filed as extreme weather. Three of the five worst days fell in December 2025.

The latest arrivals of OO 5648 in the period
Date	Arrived late by	Largest filed cause
3 April 2026	18 hours 31 minutes	Extreme weather
28 April 2026	5 hours 43 minutes	Carrier
30 December 2025	5 hours 42 minutes	Late-arriving aircraft
7 December 2025	5 hours 5 minutes	National Airspace System
29 December 2025	4 hours 54 minutes	Late-arriving aircraft

Delay causes

Why OO 5648 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 9,878 reported delay minutes.

National Airspace System
31%
Late-arriving aircraft
31%
Carrier
25%
Extreme weather
13%

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 2.2 times the usual weather exposure. The split is drawn from 9,878 delay minutes reported on OO 5648.

Cancellations run at 5.53%, against 1.89% nationally. That is roughly 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

19.2% 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 three other city pairs in the data, including SAF to DEN (45), SBN to ORD (37) and RDM to SFO (3), but none flew often enough under OO 5648 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. 253 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 5648

For a booking, the cancellation rate is the figure to plan around on OO 5648: 5.53% of its 253 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, September 2025 to August 2026. Last updated 22 October 2026; recomputed monthly. How this data is collected.

Key figures