Connection · one ticket · schedule Jun 6 – Jul 31, 2026 · records Aug 2025 – Jul 2026
Boston → St Louis via Denver: arrives on time 81%
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09:40 BOS → 12:12 DENUA 662 · United · 4h 32m · 91% on time, 0.7% cancelled
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1h 13m layover in Denver (DEN) · 45 min minimum on one ticket
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13:25 DEN → 16:33 STLUA 1639 · United · 2h 08m · 87% on time, 0.0% cancelled
Total trip 7h 53m, scheduled departure to arrival (St Louis is 1 h behind Boston). Times are local. Both flew on 55 of the last 56 days.
Makes the connection94%The first flight arrived more than 28 minutes late on 6% of the days it flew: too late for the 45-minute minimum connection on a 1h 13m layover.
Arrives on time81%First flight not cancelled (0.7% are) × connection made (94%) × second flight not cancelled (0.0% are) and within 15 minutes (87%).
Total trip7h 53mBOS 09:40 to STL 16:33, 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.