About 1 in 8 AA 4549 flights from Louisville arrived 15+ minutes late, diverted or cancelled over the past year (12%); 1.7% were cancelled. The typical flight landed 12 minutes early.
AA 4549: SDF → DCA
Scheduled to leave Louisville at 6:00 a.m. local time, operated by Republic Airways as YX 4549. Over the past year it arrived on time 88% of the time (364 flights), in line with other AA flights on the route at that hour (89%). Last seen in the data Aug 31, 2026.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 53 | 85% |
| Tuesday | 52 | 88% |
| Wednesday | 52 | 92% |
| Thursday | 52 | 94% |
| Friday | 52 | 90% |
| Saturday | 52 | 81% |
| Sunday | 51 | 86% |
Why it was late
All flights SDF → DCA · Connecting off AA 4549? Check the risk
Questions
How often is AA 4549 from SDF to DCA late?
American Airlines 4549 from Louisville, KY to Washington, DC arrived 15 or more minutes late, was diverted or was cancelled on 12% of 364 scheduled flights between September 2025 and August 2026. 1.7% 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 American Airlines for today's flight. Method.