Carrier route record
YXSDF→DTW
Republic Airways · Louisville to Detroit
- Flights
- 408
- Period
- September 2025 to August 2026
- Share of route
- 37%
- Carriers
- 3
Historical statistics for September 2025 to August 2026, not live status. For today’s flights, check with Republic Airways.
Republic on SDF to DTW earns an A+. Close to nine flights in ten arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 13 points better than the national rate of 77.3%. When something does go wrong the average delay runs a little over an hour. That rests on 408 flights, with a median arrival 10 minutes early.
Set against the rest of the country, Republic's SDF to DTW record is 13 points better than the US average of 77.3%. That gap is worth roughly 126 fewer late arrivals for every thousand flights.
Key figures
On time
89.9%
Arrivals under 15 minutes late, of 407 completed flights
Avg delay
77 min
Across delayed arrivals only, not all flights
Cancelled
0.25%
National rate is 1.89%
Whole route
82.7%
Every carrier on SDF to DTW, 1,089 flights
These figures cover 408 flights between September 2025 and August 2026. The median arrival is 10 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 SDF to DTW
Republic flew 408 of the 1,089 flights on SDF to DTW, about 37% of it. Its 89.9% on time is 7 points better than the route as a whole, which runs 82.7%. Ranked by on-time rate it is first of three carriers on the route, where the range runs from Republic at 89.9% to Delta at 63.6%. 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 Airways (this page) | 408 | 89.9% | 77 min | 0.25% | A+ |
| SkyWest Airlines | 670 | 78.6% | 134 min | 1.49% | B |
| Delta Air Linesthin sample | 11 | 63.6% | 114 min | 0.00% | D+ |
Flight by flight
Republic flight numbers on SDF to DTW
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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 10 points, against half a point between the best and worst carrier.
- 5am–8am79 flights84.8%
- 8am–11am290 flights90.7%
- 11am–2pm—
- 2pm–5pm—
- 5pm–8pm39 flights94.9%
- 8pm–5am—
Scale runs 75% to 100%. Rows with fewer than 30 flights show a dash.
The 5pm–8pm window is the strongest at 94.9% on time. The full set of windows spans 10 points.
Across the year
Republic on SDF to DTW through the year
January is the weak month at 71.9% on time, against 100.0% in August. 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. October was the busiest month here, with 48 flights.
Across the week, Thursday is the strongest day at 94.7% on time and Friday the weakest at 85.5%, a spread of 9 points.
Arrival by arrival
How late Republic on SDF to DTW runs when it is late
Republic on SDF to DTW often beats the schedule: 106 of 407 completed flights, 26%, arrived 15 minutes or more early. The 41 late arrivals split 15 under half an hour, 10 between 30 and 60 minutes, and 16 an hour or more.
- 15+ min early106 flights26.0%
- Within 15 min260 flights63.9%
- 15–29 min late15 flights3.7%
- 30–59 min late10 flights2.5%
- 1–2 hours late7 flights1.7%
- 2+ hours late9 flights2.2%
Scale runs 0% to 100%.
Share of 407 completed flights by arrival against schedule.
Time lost at the gate mostly stays lost. Of 39 departures that left 15 minutes late or more, only 4 made it up before arrival. Only 6 left on time and still arrived late.
The worst days
Worst days for Republic on SDF to DTW
The latest arrival of the period was on 19 July 2026, 6 hours 21 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on four of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 19 July 2026 | 6 hours 21 minutes | Carrier |
| 8 January 2026 | 4 hours 54 minutes | Carrier |
| 5 November 2025 | 2 hours 59 minutes | Late-arriving aircraft |
| 21 October 2025 | 2 hours 52 minutes | Carrier |
| 26 January 2026 | 2 hours 52 minutes | Carrier |
Delay causes
Why Republic runs late on this route
Carrier accounts for 70% of the 3,148 delay minutes carriers reported here, and the remaining four split what is left.
- 70%Carrier
- 19%National Airspace System
- 11%Late-arriving aircraft
- 1%Extreme weather
The largest share of delay minutes, 70%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 2,190 of the 3,148 delay minutes reported here. The split is drawn from 3,148 reported delay minutes.
Cancellations are rare at 0.25%, below the national 1.89% and low enough to earn the plus on the grade. Roughly one flight in 100 is called off; the risk here is arriving late, not not arriving.
Connections and stage length
What a delay here costs
Badly late arrivals are rare here: only 3.9% land an hour or more behind schedule, against 8.3% nationally. Connections built on this flight are about as safe as US domestic connections get, though a cancelled flight still ignores every layover you give it.
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 5pm–8pm window matters as much as it does.
The return leg is a different operation and performs like one: it runs 77.6% on time across 408 flights, 12 points below 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 12 points of difference.
One caution: this is a thin sample. 408 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 SDF to DTW
Put together: treat all of this as provisional. 408 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 89.9% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 407 completed flights over 12 months sit behind that.
Related
Where to go next
- SDF to DTW, every carrier
- Republic on DTW to SDF, the return leg
- SkyWest Airlines on SDF to DTW78.6%
- Republic Airways network-wide record
- Detroit Metropolitan Wayne County (DTW) delay statistics
- The best time of day to fly, according to 7.05 million flight records
- Worst months to fly in the US, ranked by the data
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.