ORIGIN AIRPORT REPORT
ONT
Ontario, CA (ONT) departure reliability
Of 25,871 scheduled reportable flights departing ONT, 81.2% arrived on time, 11.0% arrived at least 30 minutes late, and 0.9% were cancelled during July 2025–June 2026.
Source: U.S. Bureau of Transportation Statistics · Origin-airport cohort · Updated September 16, 2026
HISTORICAL ROUTE SIGNALLower disruption
81.2%arrived on time
11.0%30+ min late
0.9%cancelled
25,871scheduled flights
MOST-FLOWN DIRECTIONS
ALL ROUTES →Which route from ONT had the largest sample?
ONT to PHX was ONT's largest published route sample, with 3,059 scheduled flights and a 82.2% on-time rate during July 2025–June 2026.
ONT→PHXOntario, CA (ONT) to Phoenix, AZ (PHX)3,059 flights analyzedLower disruption82.2%on timeONT→DENOntario, CA (ONT) to Denver, CO (DEN)2,672 flights analyzedGenerally reliable79.1%on timeONT→SEAOntario, CA (ONT) to Seattle, WA (SEA)2,551 flights analyzedLower disruption85.2%on timeONT→LASOntario, CA (ONT) to Las Vegas, NV (LAS)2,479 flights analyzedGenerally reliable76.8%on timeONT→DFWOntario, CA (ONT) to Dallas/Fort Worth, TX (DFW)2,307 flights analyzedVariable75.2%on timeONT→SMFOntario, CA (ONT) to Sacramento, CA (SMF)2,109 flights analyzedLower disruption85.5%on timeONT→OAKOntario, CA (ONT) to Oakland, CA (OAK)1,490 flights analyzedLower disruption85.9%on timeONT→SJCOntario, CA (ONT) to San Jose, CA (SJC)1,318 flights analyzedLower disruption85.1%on timeONT→SFOOntario, CA (ONT) to San Francisco, CA (SFO)1,290 flights analyzedVariable64.4%on timeONT→SLCOntario, CA (ONT) to Salt Lake City, UT (SLC)1,239 flights analyzedLower disruption90.8%on timeONT→ATLOntario, CA (ONT) to Atlanta, GA (ATL)937 flights analyzedGenerally reliable87.9%on timeONT→PDXOntario, CA (ONT) to Portland, OR (PDX)550 flights analyzedLower disruption88.5%on timeONT→IAHOntario, CA (ONT) to Houston, TX (IAH)537 flights analyzedLower disruption83.8%on timeONT→DALOntario, CA (ONT) to Dallas, TX (DAL)403 flights analyzedGenerally reliable74.4%on timeONT→HNLOntario, CA (ONT) to Honolulu, HI (HNL)392 flights analyzedLower disruption88.5%on time
Which airline was most reliable departing ONT?
Among qualifying ONT airline departure results, Delta Air Lines had the highest on-time rate: 89.3% of 1,868 flights. JetBlue Airways was lowest at 73.9% across 165 flights.
| Airline | Flights | On time | 30+ min | Cancelled |
|---|---|---|---|---|
| Southwest Airlines | 11,651 | 81.1% | 10.7% | 0.4% |
| American Airlines | 3,627 | 79.0% | 12.1% | 2.1% |
| United Airlines | 2,516 | 78.8% | 13.5% | 0.4% |
| Frontier Airlines | 2,233 | 74.4% | 17.6% | 1.4% |
| Alaska Airlines | 2,035 | 83.3% | 8.6% | 1.7% |
| Delta Air Lines | 1,868 | 89.3% | 5.9% | 1.4% |
| SkyWest Airlines | 1,731 | 88.4% | 7.0% | 0.4% |
| JetBlue Airways | 165 | 73.9% | 17.6% | 1.8% |
| Envoy Air | 45 | 88.9% | 4.4% | 0.0% |
Origin report, not airport-wide operations.
These figures summarize the reported scheduled passenger flights in the dataset, not every flight or every airport process.