Connection · one ticket · schedule Jun 6 – Jul 31, 2026 · records Aug 2025 – Jul 2026
Chicago → Ontario via Nashville: arrives on time 36%
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11:20 MDW → 12:45 BNAWN 2733 · Southwest · 1h 25m · 55% on time, 0.0% cancelled
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1h 10m layover in Nashville (BNA) · 45 min minimum on one ticket
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13:55 BNA → 16:00 ONTWN 855 · Southwest · 4h 05m · 52% on time, 0.0% cancelled
Total trip 6h 40m, scheduled departure to arrival (Ontario is 2 h behind Chicago). Times are local. Both flew on 40 of the last 56 days.
Makes the connection69%The first flight arrived more than 25 minutes late on 31% of the days it flew: too late for the 45-minute minimum connection on a 1h 10m layover.
Arrives on time36%First flight not cancelled (0.0% are) × connection made (69%) × second flight not cancelled (0.0% are) and within 15 minutes (52%).
Total trip6h 40mMDW 11:20 to ONT 16:00, 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.