Which airline is most reliable for SFO (San Francisco) to BOS (Boston)?

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

How often are flights delayed from SFO to BOS?

About 25% of flights from SFO to BOS experience delays. 75% arrive on time.

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

When flights from SFO to BOS are delayed, the average delay is approximately 40 minutes.

SFO → BOS

SFO (San Francisco) to BOS (Boston)

SFO (San Francisco) to BOS (Boston) flights arrive on time 75% of the time. The most reliable airline on this route is Southwest Airlines at 79%. The average delay is 40 minutes. Delays on this route are most often caused by weather.

Source: Bureau of Transportation Statistics. Updated March 2026.

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SFO → BOS on-time performance by month

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This route is on time most of the time. About 75% of flights arrive on schedule.

Delays on this route are most often caused by weather.

Southwest Airlines edges out JetBlue Airways on this route — 79% vs 74% on time.

Airline Comparison

Southwest Airlines leads at 79% on time; JetBlue Airways trails at 74%.

SFO Airport BOS Airport

Check the return: BOS → SFO

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