Which airline is most reliable for SDF (Louisville) to DEN (Denver)?

The most reliable airline on the SDF to DEN route is United Airlines, with an on-time arrival rate of 85%.

How often are flights delayed from SDF to DEN?

About 15% of flights from SDF to DEN experience delays. 85% arrive on time.

What's the average delay on SDF to DEN flights?

When flights from SDF to DEN are delayed, the average delay is approximately 75 minutes.

Is a short connection safe after a SDF to DEN flight?

With 85% of SDF to DEN flights arriving on time and an average delay of 75 minutes when late, a connection under 60 minutes at DEN is risky. We recommend at least 75-90 minutes for domestic connections after this route.

SDF → DEN

SDF (Louisville) to DEN (Denver)

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 May 2026.

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 time

Expect ~17 min sitting on the taxiway after your gate pushes back. SDF has long runway queues.

TSA is currently ~15 min. Best time: 4 AM (about 5 min).

More about SDF →

Arriving at DEN

78% on time

When flights into DEN are late, the average delay is 67 minutes. Build buffer if you have ground plans.

If connecting at DEN: TSA is ~13 min right now. Allow at least 60 minutes for a domestic connection.

More about DEN →Connection times at DEN →

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Data last updated May 2026. Source: Bureau of Transportation Statistics.