Connection · one ticket · schedule Jun 6 – Jul 31, 2026 · records Aug 2025 – Jul 2026
Seattle → Boston via Philadelphia: arrives on time 38%
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08:20 SEA → 16:42 PHLAA 3219 · American · 5h 22m · 82% on time, 4.2% cancelled
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48m layover in Philadelphia (PHL) · 45 min minimum on one ticket
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17:30 PHL → 19:05 BOSAA 2960 · American · 1h 35m · 57% on time, 2.8% cancelled
Total trip 7h 45m, scheduled departure to arrival (Boston is 3 h ahead of Seattle). Times are local. Both flew on 22 of the last 56 days.
Makes the connection71%The first flight arrived more than 3 minutes late on 29% of the days it flew: too late for the 45-minute minimum connection on a 48m layover.
Arrives on time38%First flight not cancelled (4.2% are) × connection made (71%) × second flight not cancelled (2.8% are) and within 15 minutes (57%).
Total trip7h 45mSEA 08:20 to BOS 19:05, 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.