Connection · one ticket · schedule Jun 6 – Jul 31, 2026 · records Aug 2025 – Jul 2026
Salt Lake City → Boston via San Francisco: arrives on time 57%
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20:23 SLC → 21:44 SFOUA 5457 · United, flown by SkyWest · 2h 20m · 54% on time, 1.7% cancelled
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1h 21m layover in San Francisco (SFO) · 45 min minimum on one ticket
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23:05 SFO → 08:01 BOS +1 dayUA 1665 · United · 5h 56m · 84% on time, 1.5% cancelled
Total trip 9h 38m, scheduled departure to arrival (Boston is 2 h ahead of Salt Lake City). Times are local. Both flew on 0 of the last 56 days, too few to list among the best connections.
Makes the connection70%The first flight arrived more than 36 minutes late on 30% of the days it flew: too late for the 45-minute minimum connection on a 1h 21m layover.
Arrives on time57%First flight not cancelled (1.7% are) × connection made (70%) × second flight not cancelled (1.5% are) and within 15 minutes (84%).
Total trip9h 38mSLC 20:23 to BOS 08:01, 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.