Flight number record

OO 5402

SkyWest Airlines · Milwaukee to Chicago

Route: MKE → ORD
Departs: 08:30
Flights: 363
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s OO 5402, 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 5402 sits in the middle of the pack with a C−. About seven flights in ten arrive on time by the DOT's definition, 6 points worse than the national rate of 77.6%. The late ones land an hour and a half behind schedule. That rests on 363 flights, with a median arrival 1 minute late.

The national on-time rate over the same period is 77.6%, so OO 5402 runs 6 points behind the country as a whole. Across a thousand flights that is about 61 extra late arrivals.

On time

71.5%

Arrivals under 15 minutes late, of 351 completed flights

Avg delay

95 min

Across delayed arrivals only, not all flights

Cancelled

3.31%

National rate is 1.81%

1 hour+ late

14.0%

National rate is 8.1%

These figures cover 363 flights between July 2025 and June 2026. Beyond the headline rate, 14.0% 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 5402 flies

OO 5402 flies MKE to ORD without a single fixed slot. Its most common scheduled departure was 08:30, used on 131 of 363 flights, with 08:35 (61 flights) and 08:33 (58 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 08:30131 flights36.1%
Departs 08:3561 flights16.8%
Departs 08:3358 flights16.0%

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 08:30 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 84.1%, and OO 5402 runs 13 points worse at 71.5%. 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 5402 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 5402 is 4 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 trails by 8 points.

OO 5402 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
OO 5402thin sample	363	71.5%	95 min	3.31%	C−
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 5402 quarter by quarter

OO 5402 did not run the same all year. Its best quarter was Apr–Jun 2026 at 81.2% on time and its weakest Jul–Sep 2025 at 67.0%, a swing of 14 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 202592 flights67.0%
Oct–Dec 202590 flights70.8%
Jan–Mar 202690 flights67.4%
Apr–Jun 202691 flights81.2%

Scale runs 60% to 85%. Rows with fewer than 30 flights show a dash.

By weekday, OO 5402 did best on Tuesday at 86.5% on time and worst on Sunday at 58.0%. Each day rests on about 52 flights, so a gap of 29 points is worth noticing but could still narrow in another year.

Delay causes

Why OO 5402 runs late

One category carries most of the weight here. Carrier accounts for 72% of the 9,517 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
72%
National Airspace System
19%
Extreme weather
9%
Late-arriving aircraft
1%

The largest share of delay minutes, 72%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. Unlike weather, that is a management outcome, and it is the category where the gap between two carriers on the same schedule is genuinely earned. It accounts for 6,828 of the 9,517 delay minutes reported here. The split is drawn from 9,517 delay minutes reported on OO 5402.

Cancellations run at 3.31%, against 1.81% nationally. That is about one flight in 30 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. 14.0% 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 5402 in the data flew MKE 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 5402

For a booking, the cancellation rate is the figure to plan around on OO 5402: 3.31% of its 363 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