Connection · one ticket · schedule Jun 6 – Jul 31, 2026 · records Aug 2025 – Jul 2026
Philadelphia → Seattle via Denver: arrives on time 9%
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16:50 PHL → 18:55 DENWN 3221 · Southwest · 4h 05m · 33% on time, 3.5% cancelled
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55m layover in Denver (DEN) · 45 min minimum on one ticket
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19:50 DEN → 21:50 SEAWN 1716 · Southwest · 3h 00m · 33% on time, 0.0% cancelled
Total trip 8h 00m, scheduled departure to arrival (Seattle is 3 h behind Philadelphia). Times are local. Both flew on 47 of the last 56 days.
Makes the connection27%The first flight arrived more than 10 minutes late on 73% of the days it flew: too late for the 45-minute minimum connection on a 55m layover.
Arrives on time9%First flight not cancelled (3.5% are) × connection made (27%) × second flight not cancelled (0.0% are) and within 15 minutes (33%).
Total trip8h 00mPHL 16:50 to SEA 21:50, 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.