Flight number record

OO 5275

SkyWest Airlines · Chicago to Duluth

Route: ORD → DLH
Departs: 20:15
Flights: 296
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s OO 5275, 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 5275 earns a D−, which is as low as this site's scale goes for a reason. Only 56.7% of flights arrive inside the 15-minute window, 21 points worse than the national rate of 77.6%. Late arrivals average an hour and a half. Treat any tight connection here as a coin flip. That rests on 296 flights, with a median arrival 8 minutes late.

The national on-time rate over the same period is 77.6%, so OO 5275 runs 21 points behind the country as a whole. Across a thousand flights that is about 209 extra late arrivals.

On time

56.7%

Arrivals under 15 minutes late, of 284 completed flights

Avg delay

95 min

Across delayed arrivals only, not all flights

Cancelled

4.05%

National rate is 1.81%

1 hour+ late

17.3%

National rate is 8.1%

These figures cover 296 flights between July 2025 and June 2026. Beyond the headline rate, 17.3% 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 5275 flies

OO 5275 flies ORD to DLH without a single fixed slot. Its most common scheduled departure was 20:15, used on 116 of 296 flights, with 20:13 (52 flights) and 20:12 (37 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 20:15116 flights39.2%
Departs 20:1352 flights17.6%
Departs 20:1237 flights12.5%

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 20:15 departure sits in the 8pm–5am window. Across every US flight scheduled in that window the on-time rate is 70.5%, and OO 5275 runs 14 points worse at 56.7%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.

Against the route

OO 5275 next to ORD to DLH

Every carrier on ORD to DLH combined arrived on time 64.6% of the time across 1,216 flights, so OO 5275 is 8 points behind it. SkyWest flew 1,133 flights on the same city pair under all its flight numbers, including this one, and those ran 63.7% on time. Across its whole network SkyWest Airlines managed 79.0%, which this flight trails by 22 points.

OO 5275 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
OO 5275thin sample	296	56.7%	95 min	4.05%	D−
All SkyWest Airlines on ORD–DLH	1,133	63.7%	79 min	3.62%	D−
All carriers on ORD–DLH	1,216	64.6%	80 min	3.87%	D−
SkyWest Airlines, whole network	852,935	79.0%	88 min	1.77%	B

Across the year

OO 5275 quarter by quarter

OO 5275 did not run the same all year. Its best quarter was Jul–Sep 2025 at 64.8% on time and its weakest Jan–Mar 2026 at 48.1%, a swing of 17 points on roughly 74 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 202590 flights64.8%
Oct–Dec 202587 flights53.6%
Jan–Mar 202687 flights48.1%
Apr–Jun 202632 flights64.5%

Scale runs 40% to 70%. Rows with fewer than 30 flights show a dash.

By weekday, OO 5275 did best on Tuesday at 66.7% on time and worst on Wednesday at 44.2%. Each day rests on about 42 flights, so a gap of 23 points is worth noticing but could still narrow in another year.

Delay causes

Why OO 5275 runs late

One category carries most of the weight here. Late-arriving aircraft accounts for 42% of the 12,000 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
42%
Carrier
32%
National Airspace System
21%
Extreme weather
6%

42% 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 12,000 reported delay minutes here, that single category outweighs weather by 8 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 11,721 delay minutes reported on OO 5275.

Cancellations run at 4.05%, against 1.81% nationally. That is about one flight in 25 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. 17.3% 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.

The same number turns up on four other city pairs in the data, including ORD to MKE (32), PNS to IAH (23) and ORD to GSP (6), but none flew often enough under OO 5275 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to ORD to DLH only.

One caution: this is a thin sample. 296 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 5275

For a booking, the cancellation rate is the figure to plan around on OO 5275: 4.05% of its 296 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