FLL to SDF flight delays
Fort Lauderdale, FL (FLL) Louisville, KY (SDF) · 895 miles
325 flights · January 2025 – August 2026 · US Bureau of Transportation Statistics
65.92%
Arrived on time
Within 15 minutes of schedule
4.31%
Cancelled
Share of scheduled flights
70 min
When late, late by
Average across delayed arrivals
25 min
Delay per flight
Averaged over every flight flown
What the record says about this route
Cancellation, not delay, is the risk worth pricing here: 4.31% of scheduled flights never operated. A late flight still gets you there. A cancelled one leaves you rebooking, and on a route with few daily departures that can mean losing a day.
The season swings this route hard. In September it ran 54 points more punctual than in March — 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 route has been getting worse. The later months run 25.9 points less punctual than the earlier ones. A drift of that size is rarely weather; it is more often an airline adding frequencies faster than the airports can absorb them.
This is a late route. Flights from Fort Lauderdale to Louisville miss their scheduled arrival often enough that a tight connection at the far end is a connection at risk.
Which airline should you fly on this route?
Over January 2025 – August 2026, Spirit Airlines arrived on time most often on FLL to SDF. Allegiant Air was late most often. Flights ran closest to schedule in September and worst in March.
Every airline on FLL 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 |
|---|---|---|---|---|---|
| Spirit Airlines | 197 | 66.85% | 6.6% | 61 min | F |
| Allegiant Air | 116 | 64.35% | 0.86% | 86 min | F |
| Southwest Airlines | 12 | 66.67% | 0% | 42 min | — |
Month by month
Share of flights that arrived within 15 minutes of schedule, by month flown.
Other routes from Fort Lauderdale
Common questions
Are flights from Fort Lauderdale to Louisville usually delayed?
65.92% of flights on the FLL to SDF route arrived within 15 minutes of schedule, so roughly 3 in every ten arrived late. That is worse than the average route in this record.
Which airline is most on time from Fort Lauderdale to Louisville?
Spirit Airlines, at 66.85% on time across 197 flights. The least punctual on the route was Allegiant Air at 64.35%.
How often are FLL to SDF flights cancelled?
4.31% of scheduled flights did not operate — about 43 in every thousand. That is high enough that cancellation, not delay, is the risk worth planning around.
What is the best month to fly Fort Lauderdale to Louisville?
September, when 90% of flights arrived on time. The worst was March at 36%.
When FLL to SDF flights are late, how late are they?
About 70 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 FLL 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 →