Connection · one ticket · schedule Jun 6 – Jul 31, 2026 · records Aug 2025 – Jul 2026
Phoenix → Boston via San Francisco: arrives on time 43%
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13:16 PHX → 15:19 SFOUA 1427 · United · 2h 03m · 54% on time, 0.0% cancelled
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56m layover in San Francisco (SFO) · 45 min minimum on one ticket
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16:15 SFO → 01:11 BOS +1 dayUA 2001 · United · 5h 56m · 88% on time, 0.0% cancelled
Total trip 8h 55m, scheduled departure to arrival (Boston is 3 h ahead of Phoenix). Times are local. Both flew on 40 of the last 56 days.
Makes the connection49%The first flight arrived more than 11 minutes late on 51% of the days it flew: too late for the 45-minute minimum connection on a 56m layover.
Arrives on time43%First flight not cancelled (0.0% are) × connection made (49%) × second flight not cancelled (0.0% are) and within 15 minutes (88%).
Total trip8h 55mPHX 13:16 to BOS 01:11, 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.