Connection · one ticket · schedule Jun 6 – Jul 31, 2026 · records Aug 2025 – Jul 2026
Dulles → Ontario via San Francisco: arrives on time 43%
-
12:40 IAD → 15:27 SFOUA 1434 · United · 5h 47m · 79% on time, 0.3% cancelled
-
50m layover in San Francisco (SFO) · 45 min minimum on one ticket
-
16:17 SFO → 17:54 ONTUA 5613 · United, flown by SkyWest · 1h 37m · 67% on time, 3.8% cancelled
Total trip 8h 14m, scheduled departure to arrival (Ontario is 3 h behind Dulles). Times are local. Both flew on 46 of the last 56 days.
Makes the connection68%The first flight arrived more than 5 minutes late on 32% of the days it flew: too late for the 45-minute minimum connection on a 50m layover.
Arrives on time43%First flight not cancelled (0.3% are) × connection made (68%) × second flight not cancelled (3.8% are) and within 15 minutes (67%).
Total trip8h 14mIAD 12:40 to ONT 17:54, 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.