Connection · one ticket · schedule Jun 6 – Jul 31, 2026 · records Aug 2025 – Jul 2026
Chicago → Ontario via Phoenix: arrives on time 46%
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11:20 MDW → 12:55 PHXWN 4189 · Southwest · 3h 35m · 66% on time, 0.0% cancelled
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1h 00m layover in Phoenix (PHX) · 45 min minimum on one ticket
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13:55 PHX → 15:05 ONTWN 670 · Southwest · 1h 10m · 71% on time, 0.0% cancelled
Total trip 5h 45m, scheduled departure to arrival (Ontario is 2 h behind Chicago). Times are local. Both flew on 32 of the last 56 days.
Makes the connection66%The first flight arrived more than 15 minutes late on 34% of the days it flew: too late for the 45-minute minimum connection on a 1h 00m layover.
Arrives on time46%First flight not cancelled (0.0% are) × connection made (66%) × second flight not cancelled (0.0% are) and within 15 minutes (71%).
Total trip5h 45mMDW 11:20 to ONT 15:05, 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.