According to PlainFlights' airport traffic ranking (BTS On-Time Performance total flights), Ontario, CA (ONT) ranks #57 of 382 tracked US airports by total flights (most flights = #1). Ontario, CA posts below-median on-time performance among the 382 tracked U.S. airports, as a high-volume U.S. airport.
Compare ONT to another hub, filter routes, or browse airline stats without leaving this profile.
ONT on-time rate vs. the national average
Ahead of the U.S. average across all 382 tracked airports.
Delay Cause Breakdown
Top delay cause: Late Aircraft.
Total delay minutes: 1,417,402.
Late Aircraft43.6% (618,177 min)
Carrier35.3% (500,258 min)
NAS (National Aviation System)17.7% (250,648 min)
Weather3.3% (46,721 min)
Security0.1% (1,598 min)
ONT - seasonal on-time pattern
Best: February (93.4%) · worst: June (90%)
ONT - on-time rate by year
2020–2025, year-over-year trend.
ONT - taxi-out and taxi-in (monthly)
Average taxi-out 13.6 min · taxi-in 5.1 min over the last 24 reported months (U.S. airport mean taxi-out ≈ 16.4 min).
ONT's average taxi-out (13.6 min) stays shorter than the recent U.S. airport mean (~16.4 min). Even the heaviest month (October 2025, 15.1 min) is milder than many hubs' typical book.
Two PlainFlights-derived comparison paths for Ontario, CA, both outside California so the neighborhoods are not same-state geography. Axes stay disjoint: volume peers exclude the on-time peer set. Same-state compare stays below.
The standout signal at Ontario, CA is the delay mix: Late Aircraft owns 43.6% of 1,417,402 delay minutes across 272,856 BTS flights. The on-time headline is 82.3% (3.3 pts above the 79% national average), with 48,267 delayed and 2,519 cancelled (0.92%).
Delay minutes concentrate in Late Aircraft (43.6% late-aircraft, 35.3% carrier, 17.7% NAS, 3.3% weather, 0.1% security). As a busy airport, that mix matters more for connection planning than for a thin schedule.
On the multi-year calendar, ONT is strongest in February (93.4% on-time) and weakest in June (90%), a 3.4-point swing. Volume peaks in October (~4,108 flights/month). The busiest connecting route is to PHX (Phoenix) at 81.2% on-time. Field definitions: on-time performance explained.
Ontario, CA vs. the national on-time distribution
On-time rate among all 382 tracked U.S. airports
82.3%Top 63%higher than 37% of 382 airports
Ontario, CA
60%95%
U.S. airports by on-time rate, bucketed by value
Each bar is a band; taller bars hold more airports. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count and share, and where it sits relative to this entry.
Data Source: Bureau of Transportation Statistics (BTS), On-Time Performance Data (2020–2025).
Statistics reflect cumulative performance across all available reporting periods. On-time rates exclude cancelled and diverted flights.
ONT's on-time book is mid-pack; month and delay-cause mix move more than the headline rate.
Check the busiest route from ONT before you book a connection. See top routes →
Travel in February rather than June if your dates are flexible. Seasonal patterns →
Gate-to-wheels taxi-out averages 13.6 min here; check the monthly series before a tight connection. Taxi times →
On-time rate reflects the BTS historical average across all reporting carriers at this airport, not any single flight or airline.
Frequently Asked Questions
What is Ontario, CA's on-time rate?
Ontario, CA (ONT) has a 82.3% on-time rate across 272,856 BTS-tracked flights (2020-2025), 3.3 pts above the 79% national flight-weighted average; that places it in roughly the below-median on-time performance.
How does ONT rank among U.S. airports by traffic volume?
Ontario, CA ranks #57 of 382 tracked US airports by total BTS flights (most flights = #1), making it a high-volume U.S. airport.
What's the most common cause of delays at Ontario, CA?
Late Aircraft is the leading delay cause at ONT, accounting for 43.6% of delay minutes. The full breakdown: 43.6% late-aircraft, 35.3% carrier, 17.7% NAS/air-traffic-control, 3.3% weather, and 0.1% security.
When is the best time to fly through Ontario, CA?
February is historically ONT's strongest month at 93.4% on-time, while June is the weakest at 90%, a 3.4-point swing across the BTS historical record.
Data sourced from U.S. Department of Transportation Bureau of Transportation Statistics (BTS) On-Time Performance data. See our methodology for details. Retrieved and formatted by PlainFlights