Which airline is most reliable for SEA (Seattle) to BWI (Baltimore)?

The most reliable airline on the SEA to BWI route is Alaska Airlines, with an on-time arrival rate of 81%.

How often are flights delayed from SEA to BWI?

About 20% of flights from SEA to BWI experience delays. 80% arrive on time.

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

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

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

With 80% of SEA to BWI flights arriving on time and an average delay of 42 minutes when late, a connection under 60 minutes at BWI is risky. We recommend at least 75-90 minutes for domestic connections after this route.

SEA → BWI

SEA (Seattle) to BWI (Baltimore)

SEA (Seattle) to BWI (Baltimore) flights arrive on time 80% of the time. The most reliable airline on this route is Alaska Airlines at 81%. 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 August 2026.

SEA → BWI on-time performance by month

JanFebMarAprMayJunJulAugSepOctNovDec

Worse

Better

This route is on time most of the time. About 80% of flights arrive on schedule.

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

Accurate?

Airlines are roughly equal on this route — Alaska Airlines leads slightly at 81% vs Southwest Airlines at 77%.

Airline Comparison

Alaska Airlines leads at 81% on time; Southwest Airlines trails at 77%.

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 ~21 min. Best time: 4 AM (about 5 min).

More about SEA →

Arriving at BWI

80% on time

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

If connecting at BWI: TSA is ~21 min right now. Allow at least 60 minutes for a domestic connection.

More about BWI →Connection times at BWI →

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 BWI Airport

Check the return: BWI → SEA

Flying this route?

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