Connection · one ticket · schedule Jun 6 – Jul 31, 2026 · records Aug 2025 – Jul 2026
Dulles → Chicago via Boston: arrives on time 35%
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17:25 IAD → 19:14 BOSUA 688 · United · 1h 49m · 63% on time, 3.3% cancelled
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1h 01m layover in Boston (BOS) · 45 min minimum on one ticket
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20:15 BOS → 22:15 ORDUA 2229 · United · 3h 00m · 57% on time, 1.5% cancelled
Total trip 5h 50m, scheduled departure to arrival (Chicago is 1 h behind Dulles). Times are local. Both flew on 52 of the last 56 days.
Makes the connection64%The first flight arrived more than 16 minutes late on 36% of the days it flew: too late for the 45-minute minimum connection on a 1h 01m layover.
Arrives on time35%First flight not cancelled (3.3% are) × connection made (64%) × second flight not cancelled (1.5% are) and within 15 minutes (57%).
Total trip5h 50mIAD 17:25 to ORD 22:15, 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.