Connection · one ticket · schedule Jun 6 – Jul 31, 2026 · records Aug 2025 – Jul 2026
Chicago → Boston via Miami: arrives on time 33%
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16:05 ORD → 20:26 MIAAA 2910 · American · 3h 21m · 39% on time, 2.8% cancelled
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1h 19m layover in Miami (MIA) · 45 min minimum on one ticket
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21:45 MIA → 00:59 BOS +1 dayAA 1054 · American · 3h 14m · 60% on time, 2.5% cancelled
Total trip 7h 54m, scheduled departure to arrival (Boston is 1 h ahead of Chicago). Times are local. Both flew on 56 of the last 56 days.
Makes the connection59%The first flight arrived more than 34 minutes late on 41% of the days it flew: too late for the 45-minute minimum connection on a 1h 19m layover.
Arrives on time33%First flight not cancelled (2.8% are) × connection made (59%) × second flight not cancelled (2.5% are) and within 15 minutes (60%).
Total trip7h 54mORD 16:05 to BOS 00:59, 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.