Connection · one ticket · schedule Jun 6 – Jul 31, 2026 · records Aug 2025 – Jul 2026
Boston → Portland via San Francisco: arrives on time 47%
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18:10 BOS → 21:47 SFOUA 2400 · United · 6h 37m · 57% on time, 1.6% cancelled
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1h 05m layover in San Francisco (SFO) · 45 min minimum on one ticket
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22:52 SFO → 00:50 PDX +1 dayUA 2384 · United · 1h 58m · 75% on time, 0.0% cancelled
Total trip 9h 40m, scheduled departure to arrival (Portland is 3 h behind Boston). Times are local. Both flew on 51 of the last 56 days.
Makes the connection63%The first flight arrived more than 20 minutes late on 37% of the days it flew: too late for the 45-minute minimum connection on a 1h 05m layover.
Arrives on time47%First flight not cancelled (1.6% are) × connection made (63%) × second flight not cancelled (0.0% are) and within 15 minutes (75%).
Total trip9h 40mBOS 18:10 to PDX 00:50, 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.