Historical on-time performance
San Francisco to Ontario
363 miData through Dec 2025Source: US DOT · BTS
Flights on SFO–ONT arrive on time 82% of the time over the last 12 months.
On-time rate82%arrived within 15 min
p90 delay35 min1 in 10 flights is worse (tail risk)
Cancelled0.7%of scheduled flights
based on 1,118 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
Too close to call — no single carrier is clearly more on-time here.
- SkyWest AirlinesOn-time84%Medianon timep9030 minCancel2.0%Flights298
- United AirlinesOn-time81%Medianon timep9035 minCancel0.2%Flights820
Why flights run late
Delay causes
- Airline30%
- Weather2%
- Air traffic (NAS)18%
- Late aircraft50%
- Security0%
Most delay minutes here are attributed to Late aircraft.
Over time
On-time trend
By season
On-time rate by month
When to fly
Best time to fly SFO → ONT
All airlines · rolling 36 months (2023-01 .. 2025-12).
Best time of day
On-time rates are fairly even by time of day on this route — ranging from 73% to 87% on time.
- Mornings87% on time · p90 15 min · 969 flights
- Evenings83% on time · p90 35 min · 321 flights
- Middays78% on time · p90 35 min · 850 flights
- Afternoons77% on time · p90 45 min · 1,046 flights
- Overnights73% on time · p90 55 min · 1,070 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 76% to 82% on time.
- Tuesdays82% on time · p90 30 min · 565 flights
- Wednesdays82% on time · p90 35 min · 562 flights
- Saturdays82% on time · p90 30 min · 531 flights
- Thursdays78% on time · p90 40 min · 637 flights
- Fridays77% on time · p90 45 min · 654 flights
- Sundays77% on time · p90 50 min · 641 flights
- Mondays76% on time · p90 50 min · 666 flights
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