Ontario, CA · Airport profile
ONT
Ontario International Airport
ONT right now
Current operating conditions, from live sources only.
Aviation weather is not currently a factor. FAA operational data — ground stops, ground delay programs and closures — is not currently available to FlyerIntel.
FAA operational data is not currently available to FlyerIntel. Why
Minimal operational impact. Conditions are not a notable factor for operations right now.
Forecast issued 23:30Z.
UpdatedSecurity wait data is not currently available for ONT. Why
Parking data is not currently available for ONT. Why
FlyerIntel shows live values only where a permitted source provides them. Sections without data are left empty rather than estimated.
Airport reliability
Departures from ONT, July 2023 – June 2026.
Better than 87% of major US airports covered by FlyerIntel (58 compared)
Calculated from 77,572 flights. How this is calculated
Source: US DOT Bureau of Transportation Statistics · Data covering July 2023 – June 2026
Best time to fly from ONT
On-time arrival rate by scheduled local departure time.
Flights departing 5–9 AM arrived on time 91.9% of the time, against 75.6% for 6–9 PM departures — a gap of 16.2 percentage points.
By departure window
By departure hour
Source: FlyerIntel analysis of US DOT BTS data · July 2023 – June 2026 · Buckets with fewer than 120 flights are not scored.
International arrivals
How long passport control normally takes at this airport. This is the arrivals queue, not departure security.
| Terminal | Typical wait | Busy-hour wait | Worst recorded | Hours over 30 min |
|---|---|---|---|---|
| International Terminal | 18 min | 26 min | 91 min | 4.8% |
Typical wait by hour — International Terminal
Arrivals landing around 4 PM typically wait 23 min, against 11 min around 12 PM.
Source: US Customs and Border Protection · 2024-08-28 to 2026-08-27 · These are CBP passport control waits for arriving international passengers — a different queue from TSA departure screening. CBP publishes them about two days in arrears, so this describes what is normal rather than what is happening now.
What to expect at ONT
How busy the airport is through the day, from scheduled departure volume.
Scheduled departures by hour
The busiest hour is 6 AM, with about 10 departures a day, against roughly 1 at 9 PM. Counterintuitively, that peak is also more punctual than a typical hour here — early banks fly aircraft that have been on the ground overnight rather than ones inheriting the day’s delays.
Source: FlyerIntel analysis of US DOT BTS data · July 2023 – June 2026 · Taxi-out is the time between leaving the gate and lifting off, averaged across departures and weighted by hour.
Weekly and seasonal patterns
By day of week
Tuesday is historically the most reliable day and Friday the least, a gap of 5.2 percentage points.
By month
June is historically the weakest month and February the strongest, a spread of 8.1 percentage points.
Source: FlyerIntel analysis of US DOT BTS data · July 2023 – June 2026
Airlines at ONT
Departure performance by operating carrier. Regional flights are reported by the carrier that operated them, not by the mainline brand.
| Carrier | Departures | On time | Cancelled | Median delay |
|---|---|---|---|---|
| Southwest Airlines WN | 34,335 | 84.3% | 0.48% | -7 min |
| American Airlines AA | 10,341 | 83.2% | 1.48% | -9 min |
| Frontier Airlines F9 | 8,334 | 74.7% | 1.75% | -7 min |
| SkyWest Airlines OO | 6,861 | 87.1% | 0.44% | -9 min |
| Delta Air Lines DL | 5,611 | 91.5% | 1.23% | -13 min |
| United Airlines UA | 5,489 | 82.6% | 0.60% | -8 min |
| Alaska Airlines AS | 4,928 | 84.6% | 1.66% | -7 min |
| Hawaiian Airlines HA | 715 | 78.5% | 0.56% | -3 min |
| JetBlue B6 | 711 | 73.9% | 2.25% | -8 min |
Source: FlyerIntel analysis of US DOT BTS data · July 2023 – June 2026 · Carriers with fewer than 500 departures are not listed.
Routes from ONT
Ranked by FlyerIntel Route Reliability Score.
Most reliable
Busiest routes
| Destination | Flights | On time | Score |
|---|---|---|---|
| ONT → PHX Phoenix | 9,475 | 85.2% | 80 |
| ONT → DEN Denver | 8,431 | 82.4% | 74 |
| ONT → LAS Las Vegas | 7,978 | 78.1% | 67 |
| ONT → SEA Seattle | 7,496 | 86.5% | 82 |
| ONT → DFW Dallas–Fort Worth | 7,076 | 80.0% | 59 |
| ONT → SMF Sacramento | 5,967 | 87.0% | 88 |
| ONT → OAK Oakland | 4,695 | 87.0% | 87 |
| ONT → SFO San Francisco | 4,307 | 72.1% | 57 |
| ONT → SJC San Jose | 4,120 | 87.0% | 88 |
| ONT → SLC Salt Lake City | 3,610 | 91.9% | 84 |
| ONT → ATL Atlanta | 2,831 | 91.4% | 85 |
| ONT → PDX Portland | 1,737 | 87.4% | 83 |
Source: FlyerIntel analysis of US DOT BTS data · July 2023 – June 2026 · Only routes with at least 750 flights are ranked.
Reliability over time
On-time arrival rate for departures, by month.
Source: FlyerIntel analysis of US DOT BTS data · July 2023 – June 2026
Data and sources
Historical statistics
Every historical figure on this page is calculated by FlyerIntel from US DOT Bureau of Transportation Statistics on-time performance records covering July 2023 – June 2026, comprising 77,572 departures from ONT. A flight counts as delayed when it arrives 15 or more minutes after schedule.
Live conditions
Aviation weather comes from the NOAA Aviation Weather Center. Operational events come from the FAA where available. FlyerIntel shows the age of every live value and does not display data it cannot currently retrieve.
Latest observation for ONT: METAR KONT 300253Z 26011KT 10SM FEW200 30/17 A2983 RMK AO2 SLP082 T03000167 53004 $ (issued ).