Ontario

ONT · KONT

Ontario International Airport

34.06°, -117.60°CA, United States

Passengers a year

7.1M

#52 busiest in the U.S.

34

nonstop destinations

27

airlines

79

departures a day

77.7%

arrivals on time

0.8%

flights cancelled

78.0%

load factor

The ten busiest routes from ONT, by passengers: DFW, DEN, PHX, SEA, LAS, SMF, SFO, ATL, OAK, TPEONTSFOOAKSMFSEALASDENATLDFWPHXTPE
Nonstop routes — the ten busiest. Filed traffic, June 2025 – May 2026.

Airlines

Southwest Airlines is the largest carrier at Ontario, with 36% of all passengers. 27 airlines fly from here.

Share of passengers · each carrier as a slice of the whole airport

Southwest Airlines holds 36% of the airport — the 16th most concentrated of 35 medium hubs. The nearest comparison is CVG at 36%.

AirlineSharePassengersSeats YoY
WN
Southwest73% full
36.2%2.6M+1.8%
AA
American85% fullAmerican Eagle · operated by SkyWest, Envoy
15.3%1.1M+1.9%
AS
Alaska85% fullOperated by Horizon, SkyWest
9.7%684.6K+34.9%
DL
Delta85% fullDelta Connection · operated by SkyWest
9.5%674.1K-14.5%
UA
United81% fullUnited Express · operated by SkyWest
9.5%671.9K+51%
+Other airlines
19.7%1.4M—

Share, passengers and destinations count each airline’s own flights plus the regional flying sold under its brand. On-time covers the airline's own aircraft only — regional affiliates report to the government separately. Seats year on year compares the latest twelve months against the twelve before them.

Destinations

28 domestic and 6 international nonstop destinations from Ontario, across 4 countries.

91% domestic · 9% international · by departing passengers

Top domestic destinations

  • Dallas-Fort Worth (DFW)

    369K departing · 86% full

    American Airlines · Frontier Airlines

  • Denver (DEN)

    358.9K departing · 78% full

    Southwest Airlines · United Airlines · Frontier Airlines

  • Phoenix (PHX)

    340.5K departing · 70% full

    Southwest Airlines · American Airlines

  • Seattle (SEA)

    280.8K departing · 85% full

    Alaska Airlines · Delta Air Lines · Frontier Airlines

  • Las Vegas (LAS)

    279K departing · 64% full

    Southwest Airlines · Frontier Airlines

  • Sacramento (SMF)

    201.2K departing · 62% full

    Southwest Airlines

  • San Francisco (SFO)

    154.5K departing · 78% full

    United Airlines · Frontier Airlines

  • Atlanta (ATL)

    152.2K departing · 88% full

    Delta Air Lines

  • Oakland (OAK)

    139.9K departing · 59% full

    Southwest Airlines

  • San Jose (SJC)

    122.2K departing · 60% full

    Southwest Airlines

Top international destinations

  • Taoyuan, Taiwan (TPE)

    138.5K departing · 280.9K both ways

    China Airlines · STARLUX AIRLINES

  • Guadalajara, Mexico (GDL)

    118.5K departing · 241.5K both ways

    Volaris

  • San Salvador, El Salvador (SAL)

    27.5K departing · 54.4K both ways

    Avianca El Salvador

  • Morelia, Mexico (MLM)

    16.8K departing · 34.3K both ways

    Volaris

  • Silao, Mexico (BJX)

    15.2K departing · 30K both ways

    Volaris

  • San José del Cabo, Mexico (SJD)

    13.3K departing · 29K both ways

    Volaris

All nonstop destinations

34 nonstop · 12 airlines · 28 domestic / 6 intl

Aircraft

By share of departures at Ontario.

Body class · share of departures

When Ontario is busiest

Departures by month over the trailing year. Bars scale to the busiest month.

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Jan

Feb

Mar

Apr

May

Departures a month · peak July 2025

Annual passengers since 1990

Total passengers, arriving and departing, in every year on record.

Passengers a year

Every year
1990
5,730,769
1991
6,166,598
1992
6,341,193
1993
6,295,853
1994
6,617,909
1995
6,596,601
1996
6,462,945
1997
6,270,402
1998
6,276,597
1999
6,434,414
2000
6,609,536
2001
6,460,214
2002
6,238,847
2003
6,441,006
2004
6,815,260
2005
7,099,966
2006
6,952,727
2007
7,151,290
2008
6,128,322
2009
4,930,697
2010
4,872,174
2011
4,696,385
2012
4,389,430
2013
4,003,936
2014
4,126,848
2015
4,243,437
2016
4,287,543
2017
4,595,370
2018
5,096,708
2019
5,561,304
2020
2,546,728
2021
4,519,584
2022
5,783,144
2023
6,471,481
2024
7,081,098
2025
7,027,404
2026
2,700,454 so far

Arriving on time

Of every 100 flights landing at Ontario, 78 touch down within 15 minutes of schedule, 21 arrive late, and 1 is cancelled.

See live FAA delays

Every 100 arrivals

On time 78Late 21Cancelled 1

14 min

average delay

216

flights cancelled

25.6K

arrivals measured

What holds flights up

Share of delay minutes

Most reliable here

SkyWest Airlines 89.1%

Least reliable here

American Airlines 72.6%

Among US airports

#52

On time, month by month

Darker is better · 69.6%–83.5%

The weak spot is June 2026, when 69.6% of arrivals landed on time — 8.1 points below the year. The strongest was January 2026 at 83.5%.

Frequently asked

How busy is Ontario International Airport (ONT)?

Ontario International Airport handled about 7.1M passengers over the trailing 12 months, ranking #52 among U.S. airports by passengers, with roughly 79 departures a day.

Which airline is the largest at Ontario International Airport (ONT)?

Southwest Airlines is the largest carrier at Ontario (ONT), flying about 36% of its passengers. 27 airlines serve Ontario in total.

How many places can you fly nonstop from Ontario International Airport (ONT)?

Ontario (ONT) has 34 nonstop destinations — 28 domestic and 6 international across 4 countries.

How often do flights arrive on time at Ontario International Airport (ONT)?

About 77.7% of flights arriving at Ontario (ONT) touch down within 15 minutes of schedule, per US DOT figures. About 0.8% are cancelled.

What aircraft flies most from Ontario International Airport (ONT)?

The Boeing 737-700 flew the largest share of departures from Ontario (ONT), about 18% of the total.

Departing counts passengers leaving Ontario; international destinations also show both directions. Data: traffic June 2025 – May 2026, on-time July 2025 – June 2026. Source: US DOT Bureau of Transportation Statistics (T-100 Segment, On-Time Performance).