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Ontario International Airport (ONT) delays and on-time record

Ontario, California KONT #53 US airport by passengers

Live airport-wide delay programs from the FAA, the weather that causes them, and how each airline has actually performed at ONT.

FAA status
No delays reported Updated 1 min ago
Weather now
MVFR 64°F Observed 6 min ago
Late departures
23.0%May 2026 to July 2026
Security line
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FAA delay status for ONT

The FAA is not reporting a ground stop, ground delay program or other delay at ONT right now.

Source: FAA National Airspace System Status, checked 1 min ago. Airline-specific delays are not shown here.

Current conditions at ONT

MVFR

64°F18°C

Marginal: lower cloud or reduced visibility. Some delays are possible.

Wind
240° 8 mph
Visibility
3 mi
Clouds
BKN 1,100 ft, BKN 1,600 ft, OVC 3,000 ft
Ceiling
1,100 ft
Conditions
-RA BR
Pressure
29.69 inHg

METARSPECI KONT 111700Z 24007KT 3SM -RA BR BKN011 BKN016 OVC030 18/16 A2969 RMK AO2 CIG 008V013 P0000 T01780161

Source: NOAA Aviation Weather Center. Observed 6 min ago.

On-time performance at ONT

Based on 6,979 departures from May 2026 to July 2026. A flight counts as late when it leaves 15 or more minutes after schedule.

23.0%Departures late
26.9%Arrivals late
0.84%Cancelled
16.3 minAverage departure delay
On-time performance by airline at ONT
AirlineDeparturesLateCancelled
Southwest Airlines 3,048 28.2% 0.30%
American Airlines 889 19.0% 2.36%
Frontier Airlines 695 26.9% 1.44%
United Airlines 609 21.5% 0.49%
Alaska Airlines 591 16.1% 1.35%
SkyWest Airlines 536 15.7% 0.19%
Delta Air Lines 511 8.8% 0.98%

Source: Bureau of Transportation Statistics, On-Time Performance of reporting carriers. Smaller regional carriers and some airlines are not included.

Late departures by month

AprMayJunJul

How delays work at ONT

A ground stop holds flights bound for ONT at their origin airports. A ground delay program spaces arrivals out so the airport is not overloaded. Departure and arrival delay messages describe the average wait the FAA expects. None of these tell you whether your own flight is late, so always check your airline as well.

Local tips

  • Pre-book parking to get 10% off, and use promo code DECADE if you park in Lots 3, 5 or 6 before November 1, 2026.
  • Lots 5 and 6 are the best value for long trips, with a shuttle and a short walk to Terminal 4.
  • Book the Aspire Lounge in advance at aspirelounges.com, since walk-up entry costs $48.85 per adult.
  • The Terminal 2 security checkpoint closes at 12:45 a.m., so plan for late departures.