Which airline is most reliable for SEA (Seattle) to SAN (San Diego)?

The most reliable airline on the SEA to SAN route is Delta Air Lines, with an on-time arrival rate of 83%.

How often are flights delayed from SEA to SAN?

About 21% of flights from SEA to SAN experience delays. 79% arrive on time.

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

When flights from SEA to SAN are delayed, the average delay is approximately 49 minutes.

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

With 79% of SEA to SAN flights arriving on time and an average delay of 49 minutes when late, a connection under 60 minutes at SAN is risky. We recommend at least 75-90 minutes for domestic connections after this route.

SEA → SAN

SEA (Seattle) to SAN (San Diego)

SEA (Seattle) to SAN (San Diego) flights arrive on time 79% of the time. The most reliable airline on this route is Delta Air Lines at 83%. The average delay is 49 minutes. Delays on this route are most often caused by the airline (crew, maintenance, or boarding).

Source: Bureau of Transportation Statistics. Updated July 2026.

SEA → SAN on-time performance by month

JanFebMarAprMayJunJulAugSepOctNovDec

Worse

Better

This route is on time most of the time. About 79% 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 83% on time vs Southwest Airlines at 61%.

Airline Comparison

Delta Air Lines leads at 83% on time; Southwest Airlines trails at 61%.

Accurate?

Good to know

Departing from SEA

80% on time

Expect ~21 min sitting on the taxiway after your gate pushes back. SEA has long runway queues.

TSA is currently ~18 min. Best time: 4 AM (about 5 min).

More about SEA →

Arriving at SAN

77% on time

When flights into SAN are late, the average delay is 61 minutes. Build buffer if you have ground plans.

If connecting at SAN: TSA is ~13 min right now. Allow at least 60 minutes for a domestic connection.

More about SAN →Connection times at SAN →

Flight cancelled or delayed?

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Flying out of SEA? We'll brief you.

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

SEA Airport SAN Airport

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