Which airline is most reliable for SEA (Seattle) to LAS (Las Vegas)?

The most reliable airline on the SEA to LAS route is Southwest Airlines, with an on-time arrival rate of 79%.

How often are flights delayed from SEA to LAS?

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

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

When flights from SEA to LAS are delayed, the average delay is approximately 42 minutes.

SEA → LAS

SEA (Seattle) to LAS (Las Vegas)

SEA (Seattle) to LAS (Las Vegas) flights arrive on time 82% of the time. The most reliable airline on this route is Southwest Airlines at 79%. The average delay is 42 minutes. Delays on this route are most often caused by the airline (crew, maintenance, or boarding).

Source: Bureau of Transportation Statistics. Updated March 2026.

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SEA → LAS on-time performance by month

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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).

Airlines are roughly equal on this route — Southwest Airlines leads slightly at 79% vs JetBlue Airways at 76%.

Airline Comparison

Southwest Airlines leads at 79% on time; JetBlue Airways trails at 76%.

SEA Airport LAS Airport

Check the return: LAS → SEA

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