Connection · one ticket · schedule Jun 6 – Jul 31, 2026 · records Aug 2025 – Jul 2026
Dulles → Ontario via Las Vegas: arrives on time 78%
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09:50 IAD → 11:45 LASF9 4277 · Frontier · 4h 58m · 66% on time, 0.0% cancelled
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2h 14m layover in Las Vegas (LAS) · 45 min minimum on one ticket
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13:59 LAS → 15:09 ONTF9 1357 · Frontier · 1h 10m · 82% on time, 0.4% cancelled
Total trip 8h 19m, scheduled departure to arrival (Ontario is 3 h behind Dulles). Times are local. Both flew on 55 of the last 56 days.
Makes the connection95%The first flight arrived more than 89 minutes late on 5% of the days it flew: too late for the 45-minute minimum connection on a 2h 14m layover.
Arrives on time78%First flight not cancelled (0.0% are) × connection made (95%) × second flight not cancelled (0.4% are) and within 15 minutes (82%).
Total trip8h 19mIAD 09:50 to ONT 15:09, 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.