Connection · two tickets · schedule Jun 6 – Jul 31, 2026 · records Aug 2025 – Jul 2026
San Francisco → Boston via Atlanta: arrives on time 89%
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21:20 SFO → 05:20 ATLUA 1603 · United · 5h 00m · 85% on time, 0.7% cancelled
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3h 15m layover in Atlanta (ATL) · 90 min minimum on separate tickets
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08:35 ATL → 11:14 BOS +1 dayDL 2432 · Delta · 2h 39m · 93% on time, 0.9% cancelled
Total trip 10h 54m, scheduled departure to arrival (Boston is 3 h ahead of San Francisco). Times are local. Both flew on 51 of the last 56 days.
Makes the connection98%The first flight arrived more than 105 minutes late on 2% of the days it flew: too late for the 90-minute minimum connection on a 3h 15m layover.
Arrives on time89%First flight not cancelled (0.7% are) × connection made (98%) × second flight not cancelled (0.9% are) and within 15 minutes (93%).
Total trip10h 54mSFO 21:20 to BOS 11:14, 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.