What's the busiest hour for departures at ONT?

Departures from Ontario International Airport peak at 06:00 local time, averaging 20.9 flights per hour over the past 60 days.

What's the quietest hour to fly out of ONT?

The quietest hour with regular service is 04:00 local time, averaging 1.9 flights per hour.

Which airline operates the most flights from ONT?

Southwest Airlines (WN) is the largest operator at Ontario International Airport, with 500 observed departures in the past 60 days.

What's the most popular destination from ONT?

Seattle (SEA) is the most-flown destination, with 274 observed departures in the past 60 days.

🇺🇸

ONT Airport - Ontario International Airport

Ontario, United States. Departures peak at 06:00 local, averaging 20.9 flights per hour.

Window: last 60 days. Last refreshed: 2026-08-12. Schedule coverage: 21 days observed.

Peak departure hour

06:00

20.9 flights/hr

Quietest active hour

04:00

1.9 flights/hr

Traffic score

88/100

Relative volume

Departures by hour (local time)

Avg per day, last 60 days

Total: 167.5 avg departures per day.

Weekday vs weekend departure pattern

Weekday avg per hour

Weekend avg per hour

Arrivals by hour (local time)

Avg per day, last 60 days

Peak arrival hour: 22:00 local (17.5 flights/hr). Total: 159.3 avg arrivals/day.

Top airlines

1. Southwest Airlines (WN) 500
2. United Parcel Service Company (UPS) (5X) 242
3. Alaska Airlines, (AS) 186
4. American Airlines (AA) 140
5. Delta Air Lines, (DL) 139

Top destinations

1. 🇺🇸 Seattle (SEA) 274
2. 🇺🇸 Dallas-Fort Worth (DFW) 245
3. 🇺🇸 Denver (DEN) 159
4. 🇺🇸 Phoenix (PHX) 153
5. 🇺🇸 Salt Lake City (SLC) 127

Frequently asked

What's the busiest hour for departures at ONT?: Departures from Ontario International Airport peak at 06:00 local time, averaging 20.9 flights per hour over the past 60 days.
What's the quietest hour to fly out of ONT?: The quietest hour with regular service is 04:00 local time, averaging 1.9 flights per hour.
Which airline operates the most flights from ONT?: Southwest Airlines (WN) is the largest operator at Ontario International Airport, with 500 observed departures in the past 60 days.
What's the most popular destination from ONT?: Seattle (SEA) is the most-flown destination, with 274 observed departures in the past 60 days.

Tracking a flight through ONT?

Forward your booking and TripWaffle alerts you to gate changes, delays, baggage carousels, and security wait spikes - so you don't have to keep refreshing.

Get realtime alerts Free to start. No card required.

<- All airports · Busiest by hour · Quietest mornings · Methodology