IAD (Washington) to SDF (Louisville) flights arrive on time 89% of the time. The most reliable airline on this route is Republic Airways at 89%. The average delay is 65 minutes. Delays on this route are most often caused by the airline (crew, maintenance, or boarding).
Source: Bureau of Transportation Statistics. Updated May 2026.IAD → SDF
IAD (Washington) to SDF (Louisville)
IAD → SDF on-time performance by month
24
25
JanFebMarAprMayJunJulAugSepOctNovDec
Worse
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This route is usually on time. About 89% of flights arrive on schedule.
Delays on this route are most often caused by the airline (crew, maintenance, or boarding).
Accurate?
Accurate?
Good to know
Departing from IAD
83% on timeExpect ~19 min sitting on the taxiway after your gate pushes back. IAD has long runway queues.
TSA is currently ~8 min. Best time: 4 AM (about 5 min).
Arriving at SDF
81% on timeWhen flights into SDF are late, the average delay is 74 minutes. Build buffer if you have ground plans.
If connecting at SDF: TSA is ~15 min right now. Allow at least 60 minutes for a domestic connection.
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Data last updated May 2026. Source: Bureau of Transportation Statistics.