Carrier route record
YXORD→DLH
Republic Airways · Chicago to Duluth
- Flights
- 124
- Period
- September 2025 to August 2026
- Share of route
- 10%
- Carriers
- 2
Historical statistics for September 2025 to August 2026, not live status. For today’s flights, check with Republic Airways.
Republic on ORD to DLH lands a B−, level with the national rate of 77.3%. About one flight in four arrives 15 minutes late or worse, and those flights are late by an hour and a half on average. That rests on 124 flights, with a median arrival 8 minutes early.
The US average over the same twelve months is 77.3%, so there is little to separate Republic on ORD to DLH from the country as a whole. The variation that matters here is internal: which carrier, and what time of day.
Key figures
On time
76.7%
Arrivals under 15 minutes late, of 116 completed flights
Avg delay
88 min
Across delayed arrivals only, not all flights
Cancelled
4.84%
National rate is 1.89%
Whole route
65.3%
Every carrier on ORD to DLH, 1,238 flights
These figures cover 124 flights between September 2025 and August 2026. The median arrival is 8 minutes early, which is the part an average hides: most flights here are fine, and the on-time rate is decided by a tail of badly late ones. On-time means under 15 minutes late, the DOT's own threshold.
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Carrier by carrier
Republic against every carrier on ORD to DLH
Republic flew 124 of the 1,238 flights on ORD to DLH, about 10% of it. Its 76.7% on time is 11 points better than the route as a whole, which runs 65.3%. Ranked by on-time rate it is first of two carriers on the route, where the range runs from Republic at 76.7% to SkyWest at 64.0%.
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 Airways (this page)thin sample | 124 | 76.7% | 88 min | 4.84% | B− |
| SkyWest Airlines | 1,114 | 64.0% | 79 min | 4.49% | D− |
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Departure window
When Republic runs best on this route
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 25 points, against half a point between the best and worst carrier.
- 5am–8am—
- 8am–11am3 flights—
- 11am–2pm32 flights90.3%
- 2pm–5pm21 flights—
- 5pm–8pm—
- 8pm–5am68 flights65.6%
Scale runs 55% to 95%. Rows with fewer than 30 flights show a dash.
The best window here is not the first bank but the 11am–2pm slot at 90.3% on time, ahead of 8pm–5am at 65.6%. Where the curve peaks mid-day rather than at dawn, the constraint is usually congestion at one end rather than the aircraft's own rotation. The 8pm–5am window is the busiest, with 68 flights scheduled in it.
Across the year
Republic on ORD to DLH through the year
- Jan–Mar 20266 flights—
- Apr–Jun 202677 flights77.5%
- Jul–Sep 202641 flights75.0%
Scale runs 65% to 85%. Rows with fewer than 30 flights show a dash.
Monthly volumes are too low here to break the year into twelve reliable readings. What the twelve-month total says is 76.7% on time across 124 flights.
Split by quarter, Republic on ORD to DLH logged 6 flights in Jan–Mar 2026, 77 flights in Apr–Jun 2026 and 41 flights in Jul–Sep 2026. Fewer than three of those quarters carried the 30 completed flights this site needs before printing a rate, so the 76.7% annual figure is the one to use.
Arrival by arrival
How late Republic on ORD to DLH runs when it is late
Republic on ORD to DLH often beats the schedule: 37 of 116 completed flights, 32%, arrived 15 minutes or more early. The 27 late arrivals split 13 under half an hour, 6 between 30 and 60 minutes, and 8 an hour or more.
- 15+ min early37 flights31.9%
- Within 15 min52 flights44.8%
- 15–29 min late13 flights11.2%
- 30–59 min late6 flights5.2%
- 1–2 hours late3 flights2.6%
- 2+ hours late5 flights4.3%
Scale runs 0% to 100%.
Share of 116 completed flights by arrival against schedule.
Only 16 of 116 completed flights left 15 minutes late or more, too few to say how often the time is made up.
The worst days
Worst days for Republic on ORD to DLH
The latest arrival of the period was on 14 April 2026, 9 hours 27 minutes behind schedule; most of its delay minutes were filed as extreme weather. Three of the five worst days fell in April 2026.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 14 April 2026 | 9 hours 27 minutes | Extreme weather |
| 13 April 2026 | 8 hours 19 minutes | Carrier |
| 11 August 2026 | 5 hours 21 minutes | Late-arriving aircraft |
| 11 August 2026 | 2 hours 30 minutes | Late-arriving aircraft |
| 17 April 2026 | 2 hours 4 minutes | National Airspace System |
Delay causes
Why Republic 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 2,388 reported delay minutes.
- 33%Late-arriving aircraft
- 25%Carrier
- 24%Extreme weather
- 17%National Airspace System
Extreme weather accounts for 24% 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 monthly strip above is the more useful view of the risk. The national share is 6%, so this operation carries roughly 4.1 times the usual weather exposure. The split is drawn from 2,388 reported delay minutes.
Cancellations run at 4.84%, against 1.89% 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 stage length
What a delay here costs
6.9% of arrivals land an hour or more late, close to the national 8.3%, so a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last an hour and a half, which a normal layover absorbs.
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 11am–2pm window matters as much as it does.
The return leg runs 75.2% on time across 123 flights, within 2 points of this direction. The two legs are scored separately because they usually differ; on this city pair they happen not to.
One caution: this is a thin sample. 124 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 Republic on ORD to DLH
Put together: the delay figures matter less here than the 4.84% cancellation rate. A late arrival costs you an hour and a half; a cancelled flight costs you the day. Book the 11am–2pm departure so there is still a schedule behind you if it goes wrong, and treat a same-day connection as optimistic. 116 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.