Connection · one ticket · schedule Jun 6 – Jul 31, 2026 · records Aug 2025 – Jul 2026
San Diego → Boston via San Francisco: arrives on time 35%
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07:15 SAN → 09:01 SFOUA 2274 · United · 1h 46m · 53% on time, 0.7% cancelled
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1h 04m layover in San Francisco (SFO) · 45 min minimum on one ticket
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10:05 SFO → 18:59 BOSUA 2356 · United · 5h 54m · 63% on time, 0.9% cancelled
Total trip 8h 44m, scheduled departure to arrival (Boston is 3 h ahead of San Diego). Times are local. Both flew on 56 of the last 56 days.
Makes the connection57%The first flight arrived more than 19 minutes late on 43% of the days it flew: too late for the 45-minute minimum connection on a 1h 04m layover.
Arrives on time35%First flight not cancelled (0.7% are) × connection made (57%) × second flight not cancelled (0.9% are) and within 15 minutes (63%).
Total trip8h 44mSAN 07:15 to BOS 18:59, layover included
Tight connection: often missed. The first flight is late enough to miss it on more than 1 day in 4.
Not yet counted: the second flight also leaving late (which helps), gate-to-gate distance at the hub, and rebooking after a missed connection.