Connection · one ticket · schedule Jun 6 – Jul 31, 2026 · records Aug 2025 – Jul 2026
Boston → Denver via Nashville: arrives on time 11%
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14:20 BOS → 15:58 BNAWN 725 · Southwest · 2h 40m · 41% on time, 2.0% cancelled
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52m layover in Nashville (BNA) · 45 min minimum on one ticket
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16:50 BNA → 18:50 DENWN 504 · Southwest · 3h 00m · 39% on time, 0.0% cancelled
Total trip 6h 30m, scheduled departure to arrival (Denver is 2 h behind Boston). Times are local. Both flew on 48 of the last 56 days.
Makes the connection29%The first flight arrived more than 7 minutes late on 71% of the days it flew: too late for the 45-minute minimum connection on a 52m layover.
Arrives on time11%First flight not cancelled (2.0% are) × connection made (29%) × second flight not cancelled (0.0% are) and within 15 minutes (39%).
Total trip6h 30mBOS 14:20 to DEN 18:50, 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.