Connection · one ticket · schedule Jun 6 – Jul 31, 2026 · records Aug 2025 – Jul 2026
Seattle → Ontario via San Francisco: arrives on time 43%
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07:00 SEA → 09:18 SFOUA 1578 · United · 2h 18m · 11% on time, 0.0% cancelled
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1h 22m layover in San Francisco (SFO) · 45 min minimum on one ticket
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10:40 SFO → 12:12 ONTUA 2661 · United · 1h 32m · 78% on time, 0.0% cancelled
Total trip 5h 12m, scheduled departure to arrival. Times are local. Both flew on 35 of the last 56 days.
Makes the connection55%The first flight arrived more than 37 minutes late on 45% of the days it flew: too late for the 45-minute minimum connection on a 1h 22m layover.
Arrives on time43%First flight not cancelled (0.0% are) × connection made (55%) × second flight not cancelled (0.0% are) and within 15 minutes (78%).
Total trip5h 12mSEA 07:00 to ONT 12:12, 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.