Connection · one ticket · schedule Jun 6 – Jul 31, 2026 · records Aug 2025 – Jul 2026
Boston → San Francisco via Denver: arrives on time 72%
-
09:40 BOS → 12:12 DENUA 662 · United · 4h 32m · 91% on time, 0.7% cancelled
-
3h 35m layover in Denver (DEN) · 45 min minimum on one ticket
-
15:47 DEN → 17:30 SFOUA 2633 · United · 2h 43m · 73% on time, 0.0% cancelled
Total trip 10h 50m, scheduled departure to arrival (San Francisco is 3 h behind Boston). Times are local. Both flew on 56 of the last 56 days.
Makes the connection99%The first flight arrived more than 170 minutes late on 1% of the days it flew: too late for the 45-minute minimum connection on a 3h 35m layover.
Arrives on time72%First flight not cancelled (0.7% are) × connection made (99%) × second flight not cancelled (0.0% are) and within 15 minutes (73%).
Total trip10h 50mBOS 09:40 to SFO 17:30, 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.