DTW to SDF flight delays
Detroit, MI (DTW) Louisville, KY (SDF) · 306 miles
1,190 flights · January 2025 – August 2026 · US Bureau of Transportation Statistics
77.19%
Arrived on time
Within 15 minutes of schedule
1.18%
Cancelled
Share of scheduled flights
83 min
When late, late by
Average across delayed arrivals
20 min
Delay per flight
Averaged over every flight flown
What the record says about this route
The season swings this route hard. In September it ran 34.3 points more punctual than in December — a difference bigger than the one between the best and worst airlines on most routes. If the date is flexible, it is worth more than the carrier.
The 2 airlines here are separated by under 4 points — close enough to call a tie. Choose on price and departure time.
The Detroit to Louisville route sits close to the middle of the record — neither notably punctual nor notably late.
Which airline should you fly on this route?
Over January 2025 – August 2026, Republic Airways arrived on time most often on DTW to SDF. SkyWest Airlines was late most often. Flights ran closest to schedule in September and worst in December.
Every airline on DTW to SDF
Ranked by how many flights each one operated. A carrier with fewer than 100 flights in the period is listed but not graded.
| Airline | Flights | On time | Cancelled | Avg delay | Grade |
|---|---|---|---|---|---|
| SkyWest Airlines | 753 | 76.01% | 1.46% | 79 min | C |
| Republic Airways | 408 | 79.95% | 0.74% | 93 min | C |
| Spirit Airlines | 18 | 83.33% | 0% | 39 min | — |
| Delta Air Lines | 11 | 45.45% | 0% | 88 min | — |
Month by month
Share of flights that arrived within 15 minutes of schedule, by month flown.
The return leg
SDF to DTW Louisville back to Detroit 81.86% on time BOther routes from Detroit
Common questions
Are flights from Detroit to Louisville usually delayed?
77.19% of flights on the DTW to SDF route arrived within 15 minutes of schedule, so roughly 2 in every ten arrived late. That is about the same as the average route in this record.
Which airline is most on time from Detroit to Louisville?
Republic Airways, at 79.95% on time across 408 flights. The least punctual on the route was SkyWest Airlines at 76.01%.
How often are DTW to SDF flights cancelled?
1.18% of scheduled flights did not operate — about 12 in every thousand. That is in the normal range.
What is the best month to fly Detroit to Louisville?
September, when 95.9% of flights arrived on time. The worst was December at 61.6%.
When DTW to SDF flights are late, how late are they?
About 83 minutes on average across the flights that arrived more than 15 minutes behind schedule.
What these figures do and do not tell you
Everything on this page is counted from the flights that actually operated on DTW to SDF during January 2025 – August 2026, as reported by the airlines to the US Bureau of Transportation Statistics. "On time" is the federal definition: arriving at the gate within 15 minutes of the scheduled time.
A route's record is a description of the past, not a forecast. Weather, air traffic control and the aircraft's earlier flights that day drive most delays, and none of them are predictable from a historical rate. What the record does tell you is whether this route runs late more often than others, and which carrier on it has the better history — which is the part you can actually act on when you book.
Cancellations are counted separately from delays because they are a different problem for a traveller: a late flight still gets you there. How the grade is calculated →