Carrier route record
OODTW→SDF
SkyWest Airlines · Detroit to Louisville
- Flights
- 670
- Period
- September 2025 to August 2026
- Share of route
- 62%
- Carriers
- 3
Historical statistics for September 2025 to August 2026, not live status. For today’s flights, check with SkyWest Airlines.
SkyWest on DTW to SDF lands a B, level with the national rate of 77.3%. Roughly one flight in five arrives 15 minutes late or worse, and those flights are late by an hour and a half on average. That rests on 670 flights, with a median arrival 7 minutes early.
The US average over the same twelve months is 77.3%, so there is little to separate SkyWest on DTW to SDF from the country as a whole. The variation that matters here is internal: which carrier, and what time of day.
Key figures
On time
78.0%
Arrivals under 15 minutes late, of 659 completed flights
Avg delay
85 min
Across delayed arrivals only, not all flights
Cancelled
1.64%
National rate is 1.89%
Whole route
77.5%
Every carrier on DTW to SDF, 1,089 flights
These figures cover 670 flights between September 2025 and August 2026. Beyond the headline rate, 10.0% 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 DTW to SDF
SkyWest flew 670 of the 1,089 flights on DTW to SDF, most of the route. Its 78.0% on time is about level with the route as a whole at 77.5%. Ranked by on-time rate it is first of three carriers on the route, where the range runs from SkyWest at 78.0% to Delta at 45.5%. 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 |
|---|---|---|---|---|---|
| SkyWest Airlines (this page) | 670 | 78.0% | 85 min | 1.64% | B |
| Republic Airways | 408 | 77.6% | 90 min | 1.23% | B |
| Delta Air Linesthin sample | 11 | 45.5% | 88 min | 0.00% | F+ |
Timetable by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.
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 19 points, against half a point between the best and worst carrier.
- 5am–8am—
- 8am–11am344 flights82.9%
- 11am–2pm189 flights78.0%
- 2pm–5pm127 flights63.7%
- 5pm–8pm10 flights—
- 8pm–5am—
Scale runs 55% to 90%. Rows with fewer than 30 flights show a dash.
Book the morning departure. Flights leaving between 8am–11am arrive on time 82.9% of the time, against 63.7% for the afternoon window. That is 19 points of difference for no extra money, and it comes from the same aircraft having had no earlier flight to fall behind on. The 8am–11am window is the busiest, with 344 flights scheduled in it.
Across the year
SkyWest on DTW to SDF through the year
December is the weak month at 57.4% on time, against 93.0% in September. 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. April was the busiest month here, with 86 flights.
Across the week, Saturday is the strongest day at 87.2% on time and Friday the weakest at 66.7%, a spread of 21 points.
Arrival by arrival
How late SkyWest on DTW to SDF runs when it is late
SkyWest on DTW to SDF often beats the schedule: 185 of 659 completed flights, 28%, arrived 15 minutes or more early. The 145 late arrivals split 34 under half an hour, 45 between 30 and 60 minutes, and 66 an hour or more.
- 15+ min early185 flights28.1%
- Within 15 min329 flights49.9%
- 15–29 min late34 flights5.2%
- 30–59 min late45 flights6.8%
- 1–2 hours late39 flights5.9%
- 2+ hours late27 flights4.1%
Scale runs 0% to 100%.
Share of 659 completed flights by arrival against schedule.
26 of 146 late departures made up the time and arrived on time, 18% of them. 25 flights left on time and still arrived late.
The worst days
Worst days for SkyWest on DTW to SDF
The latest arrival of the period was on 30 November 2025, 12 hours 32 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). Three of the five worst days fell in December 2025.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 30 November 2025 | 12 hours 32 minutes | Carrier |
| 19 December 2025 | 7 hours 22 minutes | Carrier |
| 30 December 2025 | 6 hours | Carrier |
| 29 December 2025 | 5 hours 15 minutes | Extreme weather |
| 17 March 2026 | 5 hours 15 minutes | Carrier |
Delay causes
Why SkyWest runs late on this route
Carrier accounts for 69% of the 12,000 delay minutes carriers reported here, and the remaining four split what is left.
- 69%Carrier
- 21%Extreme weather
- 10%National Airspace System
Extreme weather accounts for 21% 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 3.4 times the usual weather exposure. The split is drawn from 12,302 reported delay minutes.
The largest share of delay minutes, 69%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 8,498 of the 12,000 delay minutes reported here.
Cancellations sit at 1.64% against a national 1.89%, which is ordinary. Diversions add another 0.00%.
Connections and stage length
What a delay here costs
10.0% 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 306 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 runs 78.6% on time across 670 flights, within half a point 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. 670 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 SkyWest on DTW to SDF
Put together: treat all of this as provisional. 670 flights over twelve months is enough to clear this site's floor and not enough to be confident to better than a couple of points. The 78.0% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 659 completed flights over 12 months sit behind that.
Related
Where to go next
- DTW to SDF, every carrier
- SkyWest on SDF to DTW, the return leg
- Republic Airways on DTW to SDF77.6%
- SkyWest Airlines network-wide record
- Detroit Metropolitan Wayne County (DTW) delay statistics
- The best time of day to fly, according to 7.05 million flight records
- How often a connection fails at the major US hubs
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.