Which airline is most reliable for PHL (Philadelphia) to DEN (Denver)?

The most reliable airline on the PHL to DEN route is United Airlines, with an on-time arrival rate of 86%.

How often are flights delayed from PHL to DEN?

About 22% of flights from PHL to DEN experience delays. 78% arrive on time.

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

When flights from PHL to DEN are delayed, the average delay is approximately 79 minutes.

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

With 78% of PHL to DEN flights arriving on time and an average delay of 79 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.

PHL → DEN

PHL (Philadelphia) to DEN (Denver)

PHL (Philadelphia) to DEN (Denver) flights arrive on time 78% of the time. The most reliable airline on this route is United Airlines at 86%. The average delay is 79 minutes. Delays on this route are most often caused by the airline (crew, maintenance, or boarding).

Source: Bureau of Transportation Statistics. Updated July 2026.

PHL → DEN on-time performance by month

JanFebMarAprMayJunJulAugSepOctNovDec

Worse

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This route is on time most of the time. About 78% of flights arrive on schedule.

Delays on this route are most often caused by the airline (crew, maintenance, or boarding).

Accurate?

United Airlines is significantly more reliable on this route at 86% on time vs Frontier Airlines at 70%.

Airline Comparison

United Airlines leads at 86% on time; Frontier Airlines trails at 70%.

Accurate?

Good to know

Departing from PHL

77% on time

Expect ~20 min sitting on the taxiway after your gate pushes back. PHL has long runway queues.

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

PHL cancels 2.4% of flights — higher than average. Have a backup plan.

More about PHL →

Arriving at DEN

79% on time

When flights into DEN are late, the average delay is 69 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.

More about DEN →Connection times at DEN →

Flight cancelled or delayed?

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Flying out of PHL? We'll brief you.

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

PHL Airport DEN Airport

Check the return: DEN → PHL

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