Carrier route record
OOORD→DLH
SkyWest Airlines · Chicago to Duluth
- Flights
- 1,114
- Period
- September 2025 to August 2026
- Share of route
- 90%
- Carriers
- 2
Historical statistics for September 2025 to August 2026, not live status. For today’s flights, check with SkyWest Airlines.
SkyWest on ORD to DLH carries a cancellation problem, not just a delay problem: 4.5% of scheduled flights never operate, against 1.9% nationally. Of the ones that do fly, about two flights in three arrive on time, worth a D− overall. The punctuality figure counts only flights that actually departed, so it flatters an operation that cancels this often. That rests on 1,114 flights, with a median arrival 2 minutes late.
The national on-time rate over the same period is 77.3%, so SkyWest on ORD to DLH runs 13 points behind the country as a whole. Across a thousand flights that is about 133 extra late arrivals.
Key figures
On time
64.0%
Arrivals under 15 minutes late, of 1,059 completed flights
Avg delay
79 min
Across delayed arrivals only, not all flights
Cancelled
4.49%
National rate is 1.89%
Whole route
65.3%
Every carrier on ORD to DLH, 1,238 flights
These figures cover 1,114 flights between September 2025 and August 2026. Beyond the headline rate, 14.4% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Carrier by carrier
SkyWest against every carrier on ORD to DLH
SkyWest flew 1,114 of the 1,238 flights on ORD to DLH, most of the route. Its 64.0% on time is about level with the route as a whole at 65.3%. Ranked by on-time rate it is last of two carriers on the route, where the range runs from Republic at 76.7% to SkyWest at 64.0%. One of those carriers flew fewer than 365 flights here, so treat their positions as rough.
Only one carrier clears this site's 365-flight floor here, so there is no comparison to draw. The table below is the full picture.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| Republic Airwaysthin sample | 124 | 76.7% | 88 min | 4.84% | B− |
| SkyWest Airlines (this page) | 1,114 | 64.0% | 79 min | 4.49% | D− |
Flight by flight
SkyWest flight numbers on ORD to DLH
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Departure window
When SkyWest runs best on this route
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 13 points, against half a point between the best and worst carrier.
- 5am–8am—
- 8am–11am290 flights71.5%
- 11am–2pm333 flights65.3%
- 2pm–5pm173 flights59.6%
- 5pm–8pm—
- 8pm–5am318 flights58.1%
Scale runs 50% to 75%. Rows with fewer than 30 flights show a dash.
The 8pm–5am window is where this operation falls apart: 58.1% on time, against 71.5% for the 8am–11am slot. By evening the aircraft flying these rotations have absorbed a full day of small delays and there is no slack left to recover in. The 11am–2pm window is the busiest, with 333 flights scheduled in it.
Across the year
SkyWest on ORD to DLH through the year
December is the weak month at 41.4% on time, against 73.7% in October. Winter delays cluster: a single storm system can account for most of a month's shortfall, so an average December hides both very good weeks and genuinely unflyable days. May was the busiest month here, with 134 flights.
Across the week, Saturday is the strongest day at 70.8% on time and Wednesday the weakest at 58.3%, a spread of 13 points.
Arrival by arrival
How late SkyWest on ORD to DLH runs when it is late
The 381 late arrivals split 117 under half an hour, 111 between 30 and 60 minutes, and 153 an hour or more.
- 15+ min early209 flights19.7%
- Within 15 min469 flights44.3%
- 15–29 min late117 flights11.0%
- 30–59 min late111 flights10.5%
- 1–2 hours late84 flights7.9%
- 2+ hours late69 flights6.5%
Scale runs 0% to 100%.
Share of 1,059 completed flights by arrival against schedule.
Time lost at the gate mostly stays lost. Of 308 departures that left 15 minutes late or more, only 24 made it up before arrival. In the other direction, 97 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 SkyWest on ORD to DLH
The latest arrival of the period was on 1 December 2025, 13 hours 54 minutes behind schedule; most of its delay minutes were filed as national airspace system delay. Three of the five worst days fell in December 2025.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 1 December 2025 | 13 hours 54 minutes | National Airspace System |
| 12 December 2025 | 13 hours 44 minutes | Carrier |
| 5 March 2026 | 11 hours 16 minutes | Late-arriving aircraft |
| 9 June 2026 | 10 hours 28 minutes | Extreme weather |
| 18 December 2025 | 10 hours | Late-arriving aircraft |
Delay causes
Why SkyWest runs late on this route
Carriers report a reason for every delay minute they cause, in five DOT categories. The split below is by minutes, not by number of flights, so a handful of very long weather delays weighs as much as many short ones. It covers 30,000 reported delay minutes.
- 41%Carrier
- 33%Late-arriving aircraft
- 17%National Airspace System
- 9%Extreme weather
The largest share of delay minutes, 41%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 12,000 of the 30,000 delay minutes reported here. The split is drawn from 30,223 reported delay minutes.
The practical consequence: the 8am–11am departure is the one that starts clean. Its aircraft has no earlier leg to be late from, which is exactly why that window shows 71.5% on time here.
Cancellations run at 4.49%, against 1.89% nationally. That is roughly 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 stage length
What a delay here costs
14.4% 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.
At 397 miles this is a short hop, and stage length matters more than it looks. A flight this short spends under two hours in the air, which leaves almost nothing to claw back a late pushback with. Delay here is decided on the ground, in the turn, which is why the 8am–11am window matters as much as it does.
The return leg is a different operation and performs like one: it runs 68.3% on time across 1,116 flights, 4 points above this direction. Departure banks, aircraft rotations and the congestion at each end all differ, so scoring the two directions together would average away a real 4 points of difference.
The sample behind these figures is 1,114 flights, enough that the headline rate is stable to within roughly a point. The hour-block and month splits divide that further, so read the thinner bars with more caution than the headline.
What to do with this
Booking SkyWest on ORD to DLH
Put together: the delay figures matter less here than the 4.49% cancellation rate. A late arrival costs you a little over an hour; a cancelled flight costs you the day. Book the 8am–11am departure so there is still a schedule behind you if it goes wrong, and treat a same-day connection as optimistic. 1,059 completed flights over 12 months sit behind that.
Related
Where to go next
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.