Which airline is most reliable for SEA (Seattle) to BOS (Boston)?

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

How often are flights delayed from SEA to BOS?

About 23% of flights from SEA to BOS experience delays. 77% arrive on time.

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

When flights from SEA to BOS are delayed, the average delay is approximately 62 minutes.

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

With 77% of SEA to BOS flights arriving on time and an average delay of 62 minutes when late, a connection under 60 minutes at BOS is risky. We recommend at least 75-90 minutes for domestic connections after this route.

SEA → BOS

SEA (Seattle) to BOS (Boston)

SEA (Seattle) to BOS (Boston) flights arrive on time 77% of the time. The most reliable airline on this route is Delta Air Lines at 84%. The average delay is 62 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 → BOS on-time performance by month

JanFebMarAprMayJunJulAugSepOctNovDec

Worse

Better

This route is on time most of the time. About 77% 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 JetBlue Airways at 65%.

Airline Comparison

Delta Air Lines leads at 84% on time; JetBlue Airways trails at 65%.

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 ~12 min. Best time: 4 AM (about 5 min).

More about SEA →

Arriving at BOS

77% on time

When flights into BOS are late, the average delay is 74 minutes. Build buffer if you have ground plans.

If connecting at BOS: TSA is ~6 min right now. Allow at least 60 minutes for a domestic connection.

More about BOS →Connection times at BOS →

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 BOS Airport

Check the return: BOS → SEA

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