Flight number record

OO 4670

SkyWest Airlines · Duluth to Chicago

Route: DLH → ORD
Departs: 08:00
Flights: 332
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s OO 4670, 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 4670 lands a B, about a point worse than the national rate of 77.6%. About one flight in four arrives 15 minutes late or worse, and those flights are late by close to two hours on average. That is a workable record, not a spotless one. That rests on 332 flights, with a median arrival 3 minutes early.

On time

76.7%

Arrivals under 15 minutes late, of 322 completed flights

Avg delay

104 min

Across delayed arrivals only, not all flights

Cancelled

2.71%

National rate is 1.81%

1 hour+ late

10.6%

National rate is 8.1%

These figures cover 332 flights between July 2025 and June 2026. Beyond the headline rate, 10.6% 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 4670 flies

OO 4670 flies DLH to ORD without a single fixed slot. Its most common scheduled departure was 08:00, used on 117 of 332 flights, with 07:55 (53 flights) and 07:50 (41 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 08:00117 flights35.2%
Departs 07:5553 flights16.0%
Departs 07:5041 flights12.3%

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 08:00 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 84.1%, and OO 4670 runs 7 points worse at 76.7%. 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 4670 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 4670 is 8 points ahead of 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 2 points.

OO 4670 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
OO 4670thin sample	332	76.7%	104 min	2.71%	B
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 4670 quarter by quarter

OO 4670 did not run the same all year. Its best quarter was Jul–Sep 2025 at 83.3% on time and its weakest Jan–Mar 2026 at 69.9%, a swing of 13 points on roughly 83 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 flights83.3%
Oct–Dec 202592 flights77.3%
Jan–Mar 202687 flights69.9%
Apr–Jun 202661 flights75.4%

Scale runs 60% to 90%. Rows with fewer than 30 flights show a dash.

By weekday, OO 4670 did best on Tuesday at 83.3% on time and worst on Monday at 70.2%. Each day rests on about 47 flights, so a gap of 13 points is worth noticing but could still narrow in another year.

Delay causes

Why OO 4670 runs late

One category carries most of the weight here. Carrier accounts for 65% of the 7,782 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
65%
Extreme weather
14%
National Airspace System
11%
Late-arriving aircraft
10%

Extreme weather accounts for 14% 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 7,782 delay minutes reported on OO 4670.

Cancellations run at 2.71%, against 1.81% nationally. That is about 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

For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 10.6% 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 three other city pairs in the data, including ORD to SDF (34), ATW to ORD (32) and FSD to ORD (1), but none flew often enough under OO 4670 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. 332 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 4670

For a booking, the cancellation rate is the figure to plan around on OO 4670: 2.71% of its 332 scheduled flights did not operate. A late arrival costs close to two hours, 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