Connection · one ticket · schedule Jun 6 – Jul 31, 2026 · records Aug 2025 – Jul 2026
Salt Lake City → Boston via San Francisco: arrives on time 33%
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09:49 SLC → 11:13 SFOUA 5970 · United, flown by SkyWest · 2h 24m · 36% on time, 0.6% cancelled
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1h 12m layover in San Francisco (SFO) · 45 min minimum on one ticket
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12:25 SFO → 21:21 BOSUA 1372 · United · 5h 56m · 79% on time, 1.2% cancelled
Total trip 9h 32m, scheduled departure to arrival (Boston is 2 h ahead of Salt Lake City). Times are local. Both flew on 56 of the last 56 days.
Makes the connection43%The first flight arrived more than 27 minutes late on 57% of the days it flew: too late for the 45-minute minimum connection on a 1h 12m layover.
Arrives on time33%First flight not cancelled (0.6% are) × connection made (43%) × second flight not cancelled (1.2% are) and within 15 minutes (79%).
Total trip9h 32mSLC 09:49 to BOS 21:21, 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.