ONT → HOU Southwest Airlines

Southwest Airlines · Ontario, CA to Houston, TX · 362 flights, 2025-07-01 to 2026-06-30 · aggregated across 12 flight numbers

This route runs much more reliably at some times of day than others — 98% on-time departing 6–9am vs. 47% departing 12–3pm.
On-time arrival
67%
Median delay
+4 min
90th percentile
+43 min
Cancellation rate
0%

How on-time is Southwest Airlines from ONT to HOU?

Across every Southwest Airlines flight number on ONT → HOU (362 flights, 2025-07-01 to 2026-06-30), 67% arrived within 15 minutes of schedule. Median arrival delay +4 min; the worst 10% ran +43 min or later. 0% were cancelled.

Delay distribution

Arrival delay for completed flights (excludes cancellations and diversions).

ArrivalFlightsShare
Early / on-time24467%
16-30 min5615%
31-60 min3610%
61-120 min195%
2+ hrs72%

Performance by month

MonthFlightsOn-timeAvg delay
2025-073174%+14 min
2025-083093%+1 min
2025-0930100%-10 min
2025-103073%+21 min
2025-112969%+15 min
2025-123165%+18 min
2026-013190%-1 min
2026-022875%+26 min
2026-033126%+36 min
2026-043043%+18 min
2026-053148%+19 min
2026-063053%+15 min

Performance by day of week

DayFlightsOn-time
Mon5260%
Tue5385%
Wed5275%
Thu5165%
Fri5149%
Sat5275%
Sun5163%

Based on US DOT Bureau of Transportation Statistics on-time data. Loading the full breakdown…