Find Cheap Flights from Chicago to Ontario (CHI - LAX)

Flights overview

Useful information for finding cheap flights from Chicago to Ontario and booking your next trip

Cheapest round-trip flights	$230	Frontier 1 stop 10 hr Thu, Jul 9 — Wed, Jul 15	The cheapest round-trip flight from Chicago to Ontario is currently $230
Cheapest one-way flight	$111	Frontier 1 stop 15 hr Wed, Jul 8	The cheapest one-way flight from Chicago to Ontario is currently $111
Cheapest nonstop flights	$287	United Nonstop 5 hr Thu, May 28 — Sat, Jun 6	The cheapest nonstop round-trip flight from Chicago to Ontario is currently $287
Last-minute weekend getaway	$335	Frontier 1 stop 15 hr Fri, May 8 — Sun, May 10	The cheapest last-minute weekend getaway from Chicago to Ontario is currently $335
Cheapest business class flights	$488	Frontier 1 stop 27 hr Thu, Jul 30 — Wed, Aug 5	The cheapest business class round-trip flight from Chicago to Ontario is currently $488

Fastest flight	4 hr 5 min	The fastest nonstop flight from Chicago to Ontario takes 4 hr 5 min
Nonstop flights	Every day	There are direct flights on this route every day.

When is the cheapest time to fly?

The cheapest month to fly from Chicago to Ontario is typically October. The most expensive month to fly is typically March.

October Cheapest	Typical prices: $145–225
March Most expensive	Typical prices: $260–510

Popular airlines from Chicago to Ontario

Southwest

Nonstop

from $273

Typical price: $350–680

7 weekly nonstop flights

MDW - ONT Every day

2754 weekly connecting flights

MDW, ORD - ONT Every day
United

Nonstop

from $287

Typical price: $325–630

7 weekly nonstop flights

ORD - ONT Every day

374 weekly connecting flights

ORD - ONT Every day
American

from $268

Typical price: $355–700

659 weekly connecting flights

ORD - ONT Every day
Delta

from $272

Typical price: $360–880

227 weekly connecting flights

MDW, ORD - ONT Every day
Frontier

from $230

Typical price: $185–435

51 weekly connecting flights

MDW, ORD - ONT Every day
Alaska

from $427

Typical price: $370–790

47 weekly connecting flights

ORD - ONT Every day

Popular airports near Chicago

Chicago O'Hare International Airport (ORD)

Chicago United States 26 min 16 mi
Chicago Midway International Airport (MDW)

Chicago United States 25 min 9 mi
Milwaukee Mitchell International Airport (MKE)

Milwaukee United States 1 hr 23 min 75 mi
Indianapolis International Airport (IND)

Indianapolis United States 2 hr 58 min 165 mi

Popular airports near Ontario

Ontario International Airport (ONT)

Ontario United States 11 min 2 mi
Los Angeles International Airport (LAX)

Los Angeles United States 1 hr 7 min 44 mi
Tijuana International Airport (TIJ)

Tijuana Mexico 2 hr 16 min 112 mi
San Diego International Airport (SAN)

San Diego United States 1 hr 50 min 95 mi

Frequently asked questions about flying from Chicago to Ontario

The cheapest flights from Chicago to Ontario are usually in October. Typical ticket prices in October range from $145 to $225.

The cheapest round-trip flight from Chicago to Ontario recently found on Google Flights was with Frontier from $230. The cheapest one-way flight was with Frontier from $111.

Some of the cheapest round-trip deals we found with different airlines:

The cheapest Southwest flight from Chicago to Ontario is $273, flying from May 28 to Jun 3.
The cheapest United flight from Chicago to Ontario is $287, flying from May 28 to Jun 6.
The cheapest American flight from Chicago to Ontario is $268, flying from May 28 to Jun 3.
The cheapest Delta flight from Chicago to Ontario is $272, flying from May 28 to Jun 3.
The cheapest Frontier flight from Chicago to Ontario is $230, flying from Jul 9 to Jul 15.
The cheapest Alaska flight from Chicago to Ontario is $427, flying from May 28 to Jun 3.

The cheapest round-trip flight from Chicago to Ontario starts at $230 from Thu, Jul 9 to Wed, Jul 15. The cheapest one-way flight starts at $111 and departs on Wed, Jul 8.

4 hr 5 min is the shortest flight time from Chicago to Ontario.

Ontario is a year-round destination, with mild to warm weather for much of the year. Summers (Jun–Aug) tend to be hot, while winters (Dec–Feb) are typically mild. There is a slightly higher chance of rain Jan–Apr. The Road to California (Jan) is a quilt show featuring quilting competitions, classes and exhibits. The city celebrates Independence Day (Jul 4) with a parade, picnic and fireworks display. The Route 66 Cruisin' Reunion (Sep) attracts vintage cars from around the country.

It's easy to use Google Flights to find the cheapest days to fly from Chicago to Ontario.
Just click the Departure label near the top of the page to open the calendar. Choose a start date and a return date to see how the round-trip fare changes on those specific days.
Adjust the trip type to see one-way fares. The cheapest available flights are highlighted and easy to spot. Once you settle on dates, click the Search button to see flight options and book the deal.

You can also turn on price tracking to get alerts if the price changes for a route or flight.

What counts as the best airline for your flights from Chicago to Ontario really depends on your individual needs. You may have a favorite carrier or a loyalty program you like, but price, convenience, and airports served also come into play. Flexibility and booking terms – Can you change flights if you want to stay longer or get a refund if you have to postpone your trip? – are also factors that help determine which airline is best to fly from Chicago to Ontario.

In terms of nonstop flights, Southwest is the most popular. Southwest offers 7 nonstop flights and 2,754 connecting flights per week. Southwest flies from Chicago Midway International Airport (MDW) , Chicago O'Hare International Airport (ORD) to Ontario International Airport (ONT) .

Other popular airlines flying from Chicago to Ontario are:

United offers 7 nonstop flights and 374 connecting flights per week. United flies from Chicago O'Hare International Airport (ORD) to Ontario International Airport (ONT) .
American offers 659 connecting flights per week. American flies from Chicago O'Hare International Airport (ORD) to Ontario International Airport (ONT) .
Delta offers 227 connecting flights per week. Delta flies from Chicago Midway International Airport (MDW) , Chicago O'Hare International Airport (ORD) to Ontario International Airport (ONT) .
Frontier offers 51 connecting flights per week. Frontier flies from Chicago Midway International Airport (MDW) , Chicago O'Hare International Airport (ORD) to Ontario International Airport (ONT) .
Alaska offers 47 connecting flights per week. Alaska flies from Chicago O'Hare International Airport (ORD) to Ontario International Airport (ONT) .

The number of connecting flights refers to distinct flights with at least one stop between Chicago and Ontario.

The cheapest round-trip flight from Chicago to Ontario recently found on Google Flights was with Frontier from $230. The cheapest one-way flight was with Frontier from $111.

Some of the cheapest round-trip deals we found with different airlines:

The cheapest Southwest flight from Chicago to Ontario is $273, flying from May 28 to Jun 3.
The cheapest United flight from Chicago to Ontario is $287, flying from May 28 to Jun 6.
The cheapest American flight from Chicago to Ontario is $268, flying from May 28 to Jun 3.
The cheapest Delta flight from Chicago to Ontario is $272, flying from May 28 to Jun 3.
The cheapest Frontier flight from Chicago to Ontario is $230, flying from Jul 9 to Jul 15.
The cheapest Alaska flight from Chicago to Ontario is $427, flying from May 28 to Jun 3.

Southwest and United fly direct from Chicago to Ontario.

There are 7 Southwest direct flights from Chicago to Ontario per week. Flights are available every day.
There are 7 United direct flights from Chicago to Ontario per week. Flights are available every day.

Use the Stops filter while searching for flights, to see only nonstop options in your results.

The cheapest last-minute deal between Chicago and Ontario at price $335 is offered by Frontier from Fri, May 8 to Sun, May 10.

Southwest and United fly direct from Chicago to Ontario.

There are 7 Southwest direct flights from Chicago to Ontario per week. Flights are available every day.
There are 7 United direct flights from Chicago to Ontario per week. Flights are available every day.

Use the Stops filter while searching for flights, to see only nonstop options in your results.

There are direct flights from Chicago to Ontario on a daily basis.

The cheapest direct (nonstop) round-trip flights between Chicago and Ontario start at $287 from Thu, May 28 to Sat, Jun 6 with United.

It's easy to find nonstop flights with Google Flights! Once you've searched for flights from Chicago to Ontario, just select the nonstop flights only option in the 'Stops’ filter in the search form and view all available direct flights and their prices.

The cheapest business class round-trip flights between Chicago and Ontario start at $488 from Thu, Jul 30 to Wed, Aug 5 with Frontier.

The cheapest economy class round-trip flights between Chicago and Ontario start at $230 from Thu, Jul 9 to Wed, Jul 15.

To book business class trips from Chicago to Ontario, look for the default Economy selection at the top, and change it to your desired cabin class such as Premium Economy, Business Class, or First Class. You can then select your departure and arrival dates, consider available options, and book your business travel.

You can also adjust the trip type to view one-way fares.

The best last-minute getaway deal for the next weekend between Chicago and Ontario starts at $335 from Fri, May 8 to Sun, May 10 with Frontier.

The cheapest last-minute deal between Chicago and Ontario at price $335 is offered by Frontier from Fri, May 8 to Sun, May 10.

To find last-minute flight deals from Chicago to Ontario, start by entering the city names, select the desired departure and return dates, and hit the Search button to view flight options.

You can check for last-minute flights for the same day or adjust the trip type to see one-way fares.