Connection · two tickets · schedule Jun 6 – Jul 31, 2026 · records Aug 2025 – Jul 2026
San Francisco → Denver via Seattle: arrives on time 93%
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22:59 SFO → 01:29 SEAUA 5579 · United, flown by SkyWest · 2h 30m · 72% on time, 0.7% cancelled
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3h 46m layover in Seattle (SEA) · 90 min minimum on separate tickets
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05:15 SEA → 08:50 DEN +1 dayWN 3615 · Southwest · 2h 35m · 95% on time, 0.0% cancelled
Total trip 8h 51m, scheduled departure to arrival (Denver is 1 h ahead of San Francisco). Times are local. Both flew on 34 of the last 56 days.
Makes the connection99%The first flight arrived more than 136 minutes late on 1% of the days it flew: too late for the 90-minute minimum connection on a 3h 46m layover.
Arrives on time93%First flight not cancelled (0.7% are) × connection made (99%) × second flight not cancelled (0.0% are) and within 15 minutes (95%).
Total trip8h 51mSFO 22:59 to DEN 08:50, 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.