Historical on-time performance
Ontario to Baltimore
2,283 miData through Dec 2025Source: US DOT · BTS
Flights on ONT–BWI 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)
Cancelled0.0%of scheduled flights
based on 122 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- Southwest AirlinesOn-time82%Medianon timep9035 minCancel0.0%Flights122
Why flights run late
Delay causes
- Airline54%
- Weather0%
- Air traffic (NAS)12%
- Late aircraft34%
- Security0%
Most delay minutes here are attributed to Airline.
Over time
On-time trend
By season
On-time rate by month
When to fly
Best time to fly ONT → BWI
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 75% to 83% on time.
- Middays83% on time · p90 35 min · 96 flights · limited
- Overnights75% on time · p90 35 min · 61 flights · limited
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