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 84%.

How often are flights delayed from SDF to DEN?

About 17% of flights from SDF to DEN experience delays. 83% 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 78 minutes.

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

With 83% of SDF to DEN flights arriving on time and an average delay of 78 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 83% of the time. The most reliable airline on this route is United Airlines at 84%. The average delay is 78 minutes. Delays on this route are most often caused by the airline (crew, maintenance, or boarding).

Source: Bureau of Transportation Statistics. Updated October 2026.

SDF → DEN on-time performance by month

JanFebMarAprMayJunJulAugSepOctNovDec

Worse

Better

This route is on time most of the time. About 83% 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 84% vs Southwest Airlines at 83%.

Airline Comparison

United Airlines leads at 84% on time; Southwest Airlines trails at 83%.

Accurate?

Good to know

Departing from SDF

81% on time

Expect ~18 min sitting on the taxiway after your gate pushes back. SDF has long runway queues.

TSA is currently ~24 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 68 minutes. Build buffer if you have ground plans.

If connecting at DEN: TSA is ~21 min right now. Allow at least 60 minutes for a domestic connection.

More about DEN →Connection times at DEN →

Flight cancelled or delayed?

Check what United Airlines owes you — refund rights, action plan, complaint email. Free.

Flying out of SDF? We'll brief you.

Delays, TSA, weather, gates — we'll let you know if something matters.

SDF Airport DEN Airport

Check the return: DEN → SDF

Flying this route?

Enter your flight number for a personalized delay briefing.

Check your flight

Know someone flying soon?

Send them the link — delay data, TSA waits, weather, all free.

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