About 1 in 6 DL 5643 flights from New York arrived 15+ minutes late, diverted or cancelled over the past year (17%); 2.6% were cancelled. The typical flight landed 12 minutes early.
DL 5643: LGA → SDF
Scheduled to leave New York at 8:30 a.m. local time, operated by Republic Airways as YX 5643. Over the past year it arrived on time 83% of the time (266 flights), in line with other DL flights on the route at that hour (84%). Last seen in the data Aug 31, 2026.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 39 | 85% |
| Tuesday | 38 | 84% |
| Wednesday | 36 | 92% |
| Thursday | 34 | 76% |
| Friday | 37 | 84% |
| Saturday | 52 | 85% |
| Sunday | 30 | 77% |
Why it was late
All flights LGA → SDF · Connecting off DL 5643? Check the risk
DL 5643: SDF → LGA
Scheduled to leave Louisville at 11:42 a.m. local time, operated by Republic Airways as YX 5643. Over the past year it arrived on time 81% of the time (241 flights), better than other DL flights on the route at that hour (77%). Last seen in the data Aug 31, 2026.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 37 | 81% |
| Tuesday | 36 | 75% |
| Wednesday | 36 | 86% |
| Thursday | 34 | 76% |
| Friday | 35 | 80% |
| Saturday | 17 | — |
| Sunday | 46 | 78% |
Why it was late
All flights SDF → LGA · Connecting off DL 5643? Check the risk
Questions
How often is DL 5643 from LGA to SDF late?
Delta Air Lines 5643 from New York, NY to Louisville, KY arrived 15 or more minutes late, was diverted or was cancelled on 17% of 266 scheduled flights between September 2025 and August 2026. 2.6% were cancelled.
How often is DL 5643 from SDF to LGA late?
Delta Air Lines 5643 from Louisville, KY to New York, NY arrived 15 or more minutes late, was diverted or was cancelled on 19% of 241 scheduled flights between September 2025 and August 2026. 4.6% were cancelled.
Flight numbers change. Figures cover flights with this airline, number and route only. "Likely range" is the 95% interval for the true on-time rate given the number of flights. This is history, not live status: check Delta Air Lines for today's flight. Method.