Connection · two tickets · schedule Jun 6 – Jul 31, 2026 · records Aug 2025 – Jul 2026
Atlanta → San Francisco via Boston: arrives on time 77%
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05:05 ATL → 07:52 BOSF9 3512 · Frontier · 2h 44m · 75% on time, 1.6% cancelled
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3h 43m layover in Boston (BOS) · 90 min minimum on separate tickets
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11:35 BOS → 15:02 SFOUA 1074 · United · 6h 27m · 80% on time, 0.4% cancelled
Total trip 12h 57m, scheduled departure to arrival (San Francisco is 3 h behind Atlanta). Times are local. Both flew on 46 of the last 56 days.
Makes the connection98%The first flight arrived more than 133 minutes late on 2% of the days it flew: too late for the 90-minute minimum connection on a 3h 43m layover.
Arrives on time77%First flight not cancelled (1.6% are) × connection made (98%) × second flight not cancelled (0.4% are) and within 15 minutes (80%).
Total trip12h 57mATL 05:05 to SFO 15:02, layover included
Not yet counted: the second flight also leaving late (which helps), gate-to-gate distance at the hub, and rebooking after a missed connection.