SDF (Louisville) to DEN (Denver) flights arrive on time 85% of the time. The most reliable airline on this route is United Airlines at 85%. The average delay is 75 minutes. Delays on this route are most often caused by the airline (crew, maintenance, or boarding).
Source: Bureau of Transportation Statistics. Updated March 2026.SDF → DEN
SDF (Louisville) to DEN (Denver)
SDF → DEN on-time performance by month
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This route is on time most of the time. About 85% of flights arrive on schedule.
Delays on this route are most often caused by the airline (crew, maintenance, or boarding).
Accurate?
Airlines are roughly equal on this route — United Airlines leads slightly at 85% vs Southwest Airlines at 83%.
Airline Comparison
United Airlines leads at 85% on time; Southwest Airlines trails at 83%.
Accurate?
Good to know
Departing from SDF
81% on timeExpect ~17 min sitting on the taxiway after your gate pushes back. SDF has long runway queues.
TSA is currently ~5 min. Best time: 4 AM (about 5 min).
Arriving at DEN
78% on timeWhen flights into DEN are late, the average delay is 67 minutes. Build buffer if you have ground plans.
If connecting at DEN: TSA is ~5 min right now. Allow at least 60 minutes for a domestic connection.
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Data last updated March 2026. Source: Bureau of Transportation Statistics.