Which airline is most reliable for SLC (Salt Lake City) to STL (St. Louis)?

The most reliable airline on the SLC to STL route is Delta Air Lines, with an on-time arrival rate of 84%.

How often are flights delayed from SLC to STL?

About 16% of flights from SLC to STL experience delays. 84% arrive on time.

What's the average delay on SLC to STL flights?

When flights from SLC to STL are delayed, the average delay is approximately 60 minutes.

Is a short connection safe after a SLC to STL flight?

With 84% of SLC to STL flights arriving on time and an average delay of 60 minutes when late, a connection under 60 minutes at STL is risky. We recommend at least 75-90 minutes for domestic connections after this route.

SLC → STL

SLC (Salt Lake City) to STL (St. Louis)

SLC (Salt Lake City) to STL (St. Louis) flights arrive on time 84% of the time. The most reliable airline on this route is Delta Air Lines at 84%. The average delay is 60 minutes. Delays on this route are most often caused by the airline (crew, maintenance, or boarding).

Source: Bureau of Transportation Statistics. Updated October 2026.

SLC → STL on-time performance by month

JanFebMarAprMayJunJulAugSepOctNovDec

Worse

Better

This route is on time most of the time. About 84% of flights arrive on schedule.

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

Accurate?

Delta Air Lines is significantly more reliable on this route at 84% on time vs SkyWest Airlines at 67%.

Airline Comparison

Delta Air Lines leads at 84% on time; SkyWest Airlines trails at 67%.

Accurate?

Good to know

Departing from SLC

85% on time

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

TSA is currently ~8 min. Best time: 4 AM (about 5 min).

More about SLC →

Arriving at STL

80% on time

When flights into STL are late, the average delay is 64 minutes. Build buffer if you have ground plans.

If connecting at STL: TSA is ~23 min right now. Allow at least 60 minutes for a domestic connection.

More about STL →Connection times at STL →

Flight cancelled or delayed?

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SLC Airport STL Airport

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