Flight number record

OO 5819

SkyWest Airlines · Chicago to Duluth

Route: ORD → DLH
Departs: 08:50
Flights: 290
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s OO 5819, 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 5819 sits in the middle of the pack with a C−. About seven flights in ten arrive on time by the DOT's definition, 7 points worse than the national rate of 77.6%. The late ones land about an hour behind schedule. That rests on 290 flights, with a median arrival 1 minute early.

The national on-time rate over the same period is 77.6%, so OO 5819 runs 7 points behind the country as a whole. Across a thousand flights that is about 70 extra late arrivals.

On time

70.6%

Arrivals under 15 minutes late, of 279 completed flights

Avg delay

60 min

Across delayed arrivals only, not all flights

Cancelled

3.10%

National rate is 1.81%

1 hour+ late

11.1%

National rate is 8.1%

These figures cover 290 flights between July 2025 and June 2026. Beyond the headline rate, 11.1% 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 5819 flies

OO 5819 flies ORD to DLH without a single fixed slot. Its most common scheduled departure was 08:50, used on 77 of 290 flights, with 08:58 (68 flights) and 09:00 (49 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 08:5077 flights26.6%
Departs 08:5868 flights23.4%
Departs 09:0049 flights16.9%

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 08:50 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 84.1%, and OO 5819 runs 14 points worse at 70.6%. 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 5819 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 5819 is 6 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 63.7% on time. Across its whole network SkyWest Airlines managed 79.0%, which this flight trails by 8 points.

OO 5819 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
OO 5819thin sample	290	70.6%	60 min	3.10%	C−
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 5819 quarter by quarter

Quarter by quarter OO 5819 held fairly steady: 70.0% in Jul–Sep 2025, 74.6% in Oct–Dec 2025, 72.7% in Jan–Mar 2026 and 67.4% in Apr–Jun 2026. A spread of 7 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.

Jul–Sep 202592 flights70.0%
Oct–Dec 202562 flights74.6%
Jan–Mar 202648 flights72.7%
Apr–Jun 202688 flights67.4%

Scale runs 60% to 80%. Rows with fewer than 30 flights show a dash.

By weekday, OO 5819 did best on Tuesday at 80.5% on time and worst on Friday at 53.7%. Each day rests on about 41 flights, so a gap of 27 points is worth noticing but could still narrow in another year.

Delay causes

Why OO 5819 runs late

One category carries most of the weight here. Carrier accounts for 55% of the 4,885 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
55%
Late-arriving aircraft
20%
National Airspace System
17%
Extreme weather
9%

The largest share of delay minutes, 55%, 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 2,677 of the 4,885 delay minutes reported here. The split is drawn from 4,885 delay minutes reported on OO 5819.

Cancellations run at 3.10%, 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. 11.1% 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 two other city pairs in the data, including ORD to DAY (26) and ORD to PVD (1), but none flew often enough under OO 5819 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. 290 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 5819

For a booking, the cancellation rate is the figure to plan around on OO 5819: 3.10% of its 290 scheduled flights did not operate. A late arrival costs about an hour, 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