Flight number record

OO 4685

SkyWest Airlines · Duluth to Chicago

Route: DLH → ORD
Departs: 15:03
Flights: 327
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s OO 4685, 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 4685 draws a D−. Roughly one flight in two arrives at least 15 minutes late, and the typical late arrival is an hour and a half behind schedule. Build slack into anything you connect to. That rests on 327 flights, with a median arrival 8 minutes late.

The national on-time rate over the same period is 77.6%, so OO 4685 runs 19 points behind the country as a whole. Across a thousand flights that is about 188 extra late arrivals.

On time

58.8%

Arrivals under 15 minutes late, of 311 completed flights

Avg delay

93 min

Across delayed arrivals only, not all flights

Cancelled

4.89%

National rate is 1.81%

1 hour+ late

17.4%

National rate is 8.1%

These figures cover 327 flights between July 2025 and June 2026. Beyond the headline rate, 17.4% 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 4685 flies

OO 4685 flies DLH to ORD without a single fixed slot. Its most common scheduled departure was 15:03, used on 108 of 327 flights, with 15:07 (51 flights) and 15:10 (37 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 15:03108 flights33.0%
Departs 15:0751 flights15.6%
Departs 15:1037 flights11.3%

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 15:03 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 72.4%, and OO 4685 runs 14 points worse at 58.8%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.

Against the route

OO 4685 next to DLH to ORD

Every carrier on DLH to ORD combined arrived on time 68.5% of the time across 1,216 flights, so OO 4685 is 10 points behind it. SkyWest flew 1,133 flights on the same city pair under all its flight numbers, including this one, and those ran 68.1% on time. Across its whole network SkyWest Airlines managed 79.0%, which this flight trails by 20 points.

OO 4685 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
OO 4685thin sample	327	58.8%	93 min	4.89%	D−
All SkyWest Airlines on DLH–ORD	1,133	68.1%	106 min	3.97%	C−
All carriers on DLH–ORD	1,216	68.5%	104 min	3.95%	C−
SkyWest Airlines, whole network	852,935	79.0%	88 min	1.77%	B

Across the year

OO 4685 quarter by quarter

Quarter by quarter OO 4685 held fairly steady: 57.0% in Jul–Sep 2025, 60.2% in Oct–Dec 2025, 58.5% in Jan–Mar 2026 and 60.0% in Apr–Jun 2026. A spread of 3 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.

Jul–Sep 202590 flights57.0%
Oct–Dec 202588 flights60.2%
Jan–Mar 202687 flights58.5%
Apr–Jun 202662 flights60.0%

Scale runs 50% to 65%. Rows with fewer than 30 flights show a dash.

By weekday, OO 4685 did best on Tuesday at 67.4% on time and worst on Thursday at 53.3%. Each day rests on about 47 flights, so a gap of 14 points is worth noticing but could still narrow in another year.

Delay causes

Why OO 4685 runs late

One category carries most of the weight here. Late-arriving aircraft accounts for 49% 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
49%
National Airspace System
29%
Carrier
14%
Extreme weather
9%

49% 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 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 11,870 delay minutes reported on OO 4685.

Cancellations run at 4.89%, 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. 17.4% 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 ATW to ORD (32), ORD to BOI (1) and FSD to ORD (1), but none flew often enough under OO 4685 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to DLH to ORD only.

One caution: this is a thin sample. 327 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 4685

For a booking, the cancellation rate is the figure to plan around on OO 4685: 4.89% of its 327 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