Connection · one ticket · schedule Jun 6 – Jul 31, 2026 · records Aug 2025 – Jul 2026
Buffalo → San Juan via Dulles: arrives on time 56%
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15:00 BUF → 16:23 IADUA 4291 · United, flown by CommuteAir · 1h 23m · 79% on time, 2.9% cancelled
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1h 01m layover in Dulles (IAD) · 45 min minimum on one ticket
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17:24 IAD → 21:24 SJUUA 2025 · United · 4h 00m · 73% on time, 0.4% cancelled
Total trip 6h 24m, scheduled departure to arrival. Times are local. Both flew on 37 of the last 56 days.
Makes the connection80%The first flight arrived more than 16 minutes late on 20% of the days it flew: too late for the 45-minute minimum connection on a 1h 01m layover.
Arrives on time56%First flight not cancelled (2.9% are) × connection made (80%) × second flight not cancelled (0.4% are) and within 15 minutes (73%).
Total trip6h 24mBUF 15:00 to SJU 21:24, 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.