Flight number record
OO 5819
SkyWest Airlines · Chicago to Duluth
- Route
- ORD → DLH
- Departs
- 08:48
- Flights
- 290
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 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, 6 points worse than the national rate of 77.3%. The late ones land about an hour behind schedule. That rests on 290 flights, with a median arrival 3 minutes early.
The national on-time rate over the same period is 77.3%, so OO 5819 runs 6 points behind the country as a whole. Across a thousand flights that is about 58 extra late arrivals.
Key figures
On time
71.5%
Arrivals under 15 minutes late, of 277 completed flights
Avg delay
56 min
Across delayed arrivals only, not all flights
Cancelled
3.45%
National rate is 1.89%
1 hour+ late
9.4%
National rate is 8.3%
These figures cover 290 flights between September 2025 and August 2026. Beyond the headline rate, 9.4% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When OO 5819 flies
OO 5819 flies ORD to DLH without a single fixed slot. Its most common scheduled departure was 08:48, used on 82 of 290 flights, with 08:50 (77 flights) and 08:58 (55 flights) next.
- Departs 08:4882 flights28.3%
- Departs 08:5077 flights26.6%
- Departs 08:5855 flights19.0%
Scale runs 0% to 100%.
Share of scheduled departures at each local time. Times used on fewer than one flight in ten are not listed.
A 08:48 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 83.9%, and OO 5819 runs 12 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.
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Against the route
OO 5819 next to ORD to DLH
Every carrier on ORD to DLH combined arrived on time 65.3% of the time across 1,238 flights, so OO 5819 is 6 points ahead of it. SkyWest flew 1,114 flights on the same city pair under all its flight numbers, including this one, and those ran 64.0% on time. Across its whole network SkyWest Airlines managed 78.7%, which this flight trails by 7 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| OO 5819thin sample | 290 | 71.5% | 56 min | 3.45% | C− |
| All SkyWest Airlines on ORD–DLH | 1,114 | 64.0% | 79 min | 4.49% | D− |
| All carriers on ORD–DLH | 1,238 | 65.3% | 80 min | 4.52% | C− |
| SkyWest Airlines, whole network | 855,406 | 78.7% | 88 min | 1.79% | B |
Across the year
OO 5819 quarter by quarter
OO 5819 did not run the same all year. Its best quarter was Jul–Sep 2026 at 78.3% on time and its weakest Apr–Jun 2026 at 67.4%, a swing of 11 points on roughly 73 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 202530 flights—
- Oct–Dec 202562 flights74.6%
- Jan–Mar 202648 flights72.7%
- Apr–Jun 202688 flights67.4%
- Jul–Sep 202662 flights78.3%
Scale runs 60% to 85%. Rows with fewer than 30 flights show a dash.
By weekday, OO 5819 did best on Monday at 77.5% on time and worst on Friday at 53.7%. Each day rests on about 41 flights, so a gap of 24 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late OO 5819 runs when it is late
The 79 late arrivals split 33 under half an hour, 20 between 30 and 60 minutes, and 26 an hour or more.
- 15+ min early58 flights20.9%
- Within 15 min140 flights50.5%
- 15–29 min late33 flights11.9%
- 30–59 min late20 flights7.2%
- 1–2 hours late19 flights6.9%
- 2+ hours late7 flights2.5%
Scale runs 0% to 100%.
Share of 277 completed flights by arrival against schedule.
Time lost at the gate mostly stays lost. Of 52 departures that left 15 minutes late or more, only 2 made it up before arrival. In the other direction, 29 flights left on time yet arrived 15 minutes late or more, so that delay built up after pushback: in the air, in a holding pattern or on the ground at DLH.
The worst days
Worst days for OO 5819
The latest arrival of the period was on 4 May 2026, 7 hours 54 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The five worst days are spread across May, November, June and August, with no single month standing out.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 4 May 2026 | 7 hours 54 minutes | Carrier |
| 9 November 2025 | 3 hours 48 minutes | National Airspace System |
| 18 June 2026 | 3 hours 7 minutes | Carrier |
| 29 November 2025 | 3 hours 6 minutes | Late-arriving aircraft |
| 31 August 2026 | 2 hours 27 minutes | Late-arriving aircraft |
Delay causes
Why OO 5819 runs late
Carrier accounts for 54% of the 4,452 delay minutes carriers reported here, and the remaining four split what is left.
- 54%Carrier
- 19%Late-arriving aircraft
- 18%National Airspace System
- 8%Extreme weather
The largest share of delay minutes, 54%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 2,417 of the 4,452 delay minutes reported here. The split is drawn from 4,452 delay minutes reported on OO 5819.
Cancellations run at 3.45%, against 1.89% 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
9.4% of arrivals land a full hour or more behind schedule, against 8.3% nationally. Ninety minutes is the honest minimum for a connection 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: 3.45% 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.
Related
Where to go next
- ORD to DLH, every carrier and departure
- DLH to ORD, the return direction
- SkyWest Airlines 5437 on the same route63.9%
- Chicago O'Hare International (ORD) delay statistics
- SkyWest Airlines on-time record
- Every SkyWest Airlines flight number with a record
- The most and least reliable flight numbers in the US
- How often a connection fails at the major US hubs
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, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.