ONT → SFO Frontier Airlines

Frontier Airlines · Ontario, CA to San Francisco, CA · 177 flights, 2025-07-04 to 2026-06-30 · aggregated across 1 flight number

This route has been on time less than half the time (42%) — expect a real chance of a delay.
On-time arrival
42%
Median delay
+28 min
90th percentile
+99 min
Cancellation rate
2%

How on-time is Frontier Airlines from ONT to SFO?

Across every Frontier Airlines flight number on ONT → SFO (177 flights, 2025-07-04 to 2026-06-30), 42% arrived within 15 minutes of schedule. Median arrival delay +28 min; the worst 10% ran +99 min or later. 2% were cancelled.

Delay distribution

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

ArrivalFlightsShare
Early / on-time7342%
16-30 min159%
31-60 min4425%
61-120 min3017%
2+ hrs116%

Performance by month

MonthFlightsOn-timeAvg delay
2025-071242%+26 min
2025-081553%+56 min
2025-091747%+34 min
2025-101844%+24 min
2025-112176%+4 min
2025-121479%+8 min
2026-01667%+28 min
2026-03875%-11 min
2026-041315%+46 min
2026-051916%+54 min
2026-06307%+73 min

Performance by day of week

DayFlightsOn-time
Mon4233%
Tue729%
Wed633%
Thu3040%
Fri4252%
Sat850%
Sun3845%

F9 flight numbers on ONT → SFO

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