Which airline is most reliable for SLC (Salt Lake City) to SEA (Seattle)?

The most reliable airline on the SLC to SEA route is Delta Air Lines, with an on-time arrival rate of 85%.

How often are flights delayed from SLC to SEA?

About 18% of flights from SLC to SEA experience delays. 82% arrive on time.

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

When flights from SLC to SEA are delayed, the average delay is approximately 53 minutes.

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

With 82% of SLC to SEA flights arriving on time and an average delay of 53 minutes when late, a connection under 60 minutes at SEA is risky. We recommend at least 75-90 minutes for domestic connections after this route.

SLC → SEA

SLC (Salt Lake City) to SEA (Seattle)

SLC (Salt Lake City) to SEA (Seattle) flights arrive on time 82% of the time. The most reliable airline on this route is Delta Air Lines at 85%. The average delay is 53 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 → SEA on-time performance by month

JanFebMarAprMayJunJulAugSepOctNovDec

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This route is on time most of the time. About 82% 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 85% on time vs Frontier Airlines at 70%.

Airline Comparison

Delta Air Lines leads at 85% on time; Frontier Airlines trails at 70%.

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

More about SLC →

Arriving at SEA

81% on time

When flights into SEA are late, the average delay is 58 minutes. Build buffer if you have ground plans.

If connecting at SEA: TSA is ~5 min right now. Allow at least 60 minutes for a domestic connection.

More about SEA →Connection times at SEA →

Flight cancelled or delayed?

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SLC Airport SEA Airport

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