Connection · one ticket · schedule Jun 6 – Jul 31, 2026 · records Aug 2025 – Jul 2026
San Francisco → Chicago via San Diego: arrives on time 15%
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14:00 SFO → 15:40 SANWN 4242 · Southwest · 1h 40m · 0% on time, 0.0% cancelled
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1h 50m layover in San Diego (SAN) · 45 min minimum on one ticket
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17:30 SAN → 23:25 MDWWN 3448 · Southwest · 3h 55m · 50% on time, 0.0% cancelled
Total trip 7h 25m, scheduled departure to arrival (Chicago is 2 h ahead of San Francisco). Times are local. Both flew on 24 of the last 56 days.
Makes the connection31%The first flight arrived more than 65 minutes late on 69% of the days it flew: too late for the 45-minute minimum connection on a 1h 50m layover.
Arrives on time15%First flight not cancelled (0.0% are) × connection made (31%) × second flight not cancelled (0.0% are) and within 15 minutes (50%).
Total trip7h 25mSFO 14:00 to MDW 23:25, 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.