Latest deals
Insights
When to book
FAQs
Reviews
Price Alerts

Cheap flights from Chicago to Los Angeles from $69

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Chicago to Los Angeles departing on 3/24. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

Discover deals from 900+ travel sites with momondo.

Save money when you book flights with momondo

Big names and deals

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize your results.

Trusted and free

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Price Alerts

Not ready to book? to track prices.
Search flight deals

Find the cheapest flights from Chicago to Los Angeles

Cheap round-trip flights

Enter your travel dates to find the best prices.
Frontier Logo
4:16 pm - 11:59 pm
ORD
-
ONT
9h 43m
1 stop
Frontier Logo
9:40 pm - 6:08 am
ONT
-
ORD
6h 28m
1 stop
$162Frontier
Thu, Mar 5 - Mon, Mar 9
Frontier Logo
7:19 pm - 1:52 pm
ORD
-
ONT
20h 33m
1 stop
Frontier Logo
2:08 pm - 1:25 pm
ONT
-
ORD
21h 17m
1 stop
$168Frontier
Mon, Feb 23 - Thu, Feb 26
Frontier Logo
4:16 pm - 11:59 pm
ORD
-
ONT
9h 43m
1 stop
Frontier Logo
6:15 am - 8:23 am
ONT
-
ORD
24h 08m
2 stops
$172Frontier
Thu, Mar 5 - Tue, Mar 10
Frontier Logo
9:17 pm - 7:14 pm
ORD
-
ONT
23h 57m
2 stops
Frontier Logo
7:17 pm - 5:24 pm
ONT
-
ORD
20h 07m
1 stop
$175Frontier
Fri, Feb 20 - Wed, Feb 25
Frontier Logo
6:00 am - 9:34 pm
ORD
-
ONT
41h 34m
2 stops
Frontier Logo
8:21 am - 11:17 pm
ONT
-
ORD
12h 56m
1 stop
$176Frontier
Mon, Feb 23 - Sat, Feb 28
Frontier Logo
4:55 pm - 10:42 pm
ORD
-
ONT
7h 47m
1 stop
Frontier Logo
12:59 am - 9:50 am
ONT
-
ORD
6h 51m
1 stop
$180Frontier
Sat, Apr 18 - Sun, Apr 19
Frontier Logo
7:19 pm - 1:11 pm
ORD
-
ONT
19h 52m
1 stop
Frontier Logo
7:22 pm - 6:08 am
ONT
-
ORD
8h 46m
1 stop
$184Frontier
Mon, Mar 2 - Thu, Mar 5
Frontier Logo
4:16 pm - 11:59 pm
ORD
-
ONT
9h 43m
1 stop
Frontier Logo
8:21 am - 11:17 pm
ONT
-
ORD
12h 56m
1 stop
$185Frontier
Thu, Feb 19 - Sat, Feb 28
Frontier Logo
2:35 pm - 11:59 pm
ORD
-
ONT
11h 24m
1 stop
Frontier Logo
6:15 am - 12:57 am
ONT
-
ORD
16h 42m
1 stop
$188Frontier
Fri, Feb 27 - Fri, Mar 6
Frontier Logo
9:17 pm - 7:14 pm
ORD
-
ONT
23h 57m
2 stops
Frontier Logo
8:21 am - 11:17 pm
ONT
-
ORD
12h 56m
1 stop
$189Frontier
Fri, Feb 20 - Sat, Feb 28

Southwest flights from Chicago to Ontario

Our best Southwest deals on Chicago to Ontario flight tickets
Southwest
Feb 18
MDW8:10 amChicago Midway
4h 30m
ONT10:40 amOntario
Feb 25
ONT6:50 amOntario
3h 50m
MDW12:40 pmChicago Midway
$337
Southwest
Feb 18
MDW8:10 amChicago Midway
4h 30m
ONT10:40 amOntario
Feb 25
ONT9:00 pmOntario
6h 05m
1 stop
MDW5:05 amChicago Midway
$347
Southwest
Feb 18
MDW8:10 amChicago Midway
8h 25m
2 stops
ONT2:35 pmOntario
Feb 25
ONT6:50 amOntario
3h 50m
MDW12:40 pmChicago Midway
$352

Frontier flights from Chicago to Ontario

Our best Frontier deals on Chicago to Ontario flight tickets
Frontier
Mar 5
ORD4:16 pmChicago O'Hare Intl
9h 43m
1 stop
ONT11:59 pmOntario
Mar 9
ONT9:40 pmOntario
6h 28m
1 stop
ORD6:08 amChicago O'Hare Intl
$162
Frontier
Feb 23
ORD7:19 pmChicago O'Hare Intl
20h 33m
1 stop
ONT1:52 pmOntario
Feb 26
ONT2:08 pmOntario
21h 17m
1 stop
ORD1:25 pmChicago O'Hare Intl
$168
Frontier
Mar 5
ORD4:16 pmChicago O'Hare Intl
9h 43m
1 stop
ONT11:59 pmOntario
Mar 10
ONT6:15 amOntario
24h 08m
2 stops
ORD8:23 amChicago O'Hare Intl
$172

momondo Fare Finder

 
Customize your flight search to find flights from Chicago to Ontario that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 832,500 searches. Data last updated January 29, 2026.
Use the filters below to find and compare flights from Chicago to Ontario that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Thu 3/5

4:16 pm-11:59 pm

1 stop9h 43m

Ontario

Mon 3/9

9:40 pm-6:08 am

1 stop6h 28m

$162

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Mon 2/23

7:19 pm-1:52 pm

1 stop20h 33m

Ontario

Thu 2/26

2:08 pm-1:25 pm

1 stop21h 17m

$168

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Thu 3/5

4:16 pm-11:59 pm

1 stop9h 43m

Ontario

Tue 3/10

6:15 am-8:23 am

2 stops24h 08m

$172

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Fri 2/20

9:17 pm-7:14 pm

2 stops23h 57m

Ontario

Wed 2/25

7:17 pm-5:24 pm

1 stop20h 07m

$175

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Mon 2/23

6:00 am-9:34 pm

2 stops41h 34m

Ontario

Sat 2/28

8:21 am-11:17 pm

1 stop12h 56m

$176

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Sat 4/18

4:55 pm-10:42 pm

1 stop7h 47m

Ontario

Sun 4/19

12:59 am-9:50 am

1 stop6h 51m

$180

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Mon 3/2

7:19 pm-1:11 pm

1 stop19h 52m

Ontario

Thu 3/5

7:22 pm-6:08 am

1 stop8h 46m

$184

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Thu 2/19

4:16 pm-11:59 pm

1 stop9h 43m

Ontario

Sat 2/28

8:21 am-11:17 pm

1 stop12h 56m

$185

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Fri 2/27

2:35 pm-11:59 pm

1 stop11h 24m

Ontario

Fri 3/6

6:15 am-12:57 am

1 stop16h 42m

$188

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Fri 2/20

9:17 pm-7:14 pm

2 stops23h 57m

Ontario

Sat 2/28

8:21 am-11:17 pm

1 stop12h 56m

$189

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
1
2

See travel insights to Los Angeles from

How to get the cheapest flight ticket from Chicago to Ontario

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the typical price of a round-trip flight between Chicago and Ontario?

What is the cheapest month to fly to Ontario?

In general, October is the cheapest month to fly from Chicago to Ontario. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $245. If you aren’t able to travel during the month of October, then book flights to Ontario from Chicago during March instead. Flights to Ontario in March, while not as cheap as those in October, still average around $310.

What is the cheapest day to depart on your flight to Ontario?

The cheapest day to depart on your flight to Ontario is on a Sunday when prices can be found for as low as $382. This is often the case because there is less demand to fly during this day of the week. When flying out on a Tuesday, the most expensive travel day of the week, you can expect to see flight prices from Chicago to Ontario for around $499.

What is the cheapest time of day to depart on your flight to Ontario?

At noon is the cheapest time of day to fly from Chicago to Ontario when you can find flight prices for as low as $379. Flying to Ontario at noon is an ideal time because this is during off-peak travel hours. If you have a flexible travel schedule, then try to avoid flying in the morning when prices are $510 on average. Flights to Ontario from Chicago in the morning are generally more expensive because this time of day is more convenient for travelers’ schedules.

What is the cheapest Chicago to Ontario flight route?

Fly from Chicago Midway to Ontario for the best Chicago - Ontario flight prices

How far in advance should I book a flight to Ontario?

You are more likely to see cheaper flights to Ontario from Chicago when booking weeks ahead of your departure date. In general, you can expect to find flights to Ontario for around $370 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Ontario from Chicago for as low as $227 on momondo.

What cabin class options are available on Chicago to Ontario flights?

There are 4 cabin classes available to choose from on Chicago to Ontario flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Can stopping save me money on Chicago to Ontario flights?

You could potentially save up to 52% on your flight if you consider stops on a Chicago to Ontario flight.

How have Chicago to Ontario flight prices changed over time?

As of January 2026, prices for Chicago to Ontario flights are approximately 46% more expensive when compared to flights at the same time last year.

When to book flights from Chicago to Ontario

Are you open to changing your travel dates? Check out the ideal times to fly from Chicago to Ontario according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Chicago to Ontario (CHI to ONT) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Chicago to Ontario

Best Price Found

$154

Fastest flight time

4h 05m

Direct flights

Every day

Airports in Ontario

1 airport
The best one-way flight to Ontario from Chicago in the past 72 hours is $154. The best round-trip flight deal from Chicago to Ontario found on momondo in the last 72 hours is $442.
The fastest flight from Chicago to Ontario takes 4h 05m
Direct flights go from Chicago to Ontario every day.
There is 1 airport in Ontario. From Chicago there are direct flights to Ontario (ONT).
Search flight deals

  • How far is Chicago to Ontario by plane?

    The distance between Chicago and Ontario is about 1710.7 mi. In terms of flight time, this usually takes a little over 4h 05m.

  • When did momondo last update prices for flights from Chicago to Ontario Airport?

    Prices for flights from Chicago to Ontario Airport refresh daily.

  • How many operators does momondo search for flights from Chicago to Ontario Airport?

  • How old do you have to be to fly from Chicago to Ontario Airport?

    The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Chicago to Ontario Airport.

  • What documentation or ID do you need to fly to Ontario Airport?

    The travel and health documents required for your trip to Ontario Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Ontario Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

  • What is the most popular plane model from Chicago to Ontario?

  • What is the most popular airline from Chicago to Ontario?

Best airlines flying from Chicago to Ontario

Compare and see reviews for airlines that fly from Chicago to Ontario with momondo
Airline
Rating
Free Cancellation
Price
FrontierPriceFrom $123Free CancellationRating
5.7
3,056 reviews
Search Frontier flights
American AirlinesPriceFrom $231Free CancellationRating
7.2
11,205 reviews
Search American Airlines flights
United AirlinesPriceFrom $237Free CancellationRating
7.4
9,215 reviews
Search United Airlines flights
SouthwestPriceFrom $246Free CancellationRating
8.0
4,267 reviews
Search Southwest flights
DeltaPriceFrom $256Free CancellationRating
7.9
8,128 reviews
Search Delta flights

  • Southwest Flights From Chicago to Ontario

    Across 10 Southwest flights from Chicago to Ontario this week, the average price was $445, with the best Southwest deals starting from $246 round-trip. 4,267 users have rated Southwest on momondo, with an average score of 8.0/10.

Why use momondo?

Why should I use momondo to find a flight deal from Chicago to Ontario?

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from Chicago to Ontario. momondo saves you time and could save you money on your trip.

Can I find flights from Chicago to Ontario with flexible booking policies on momondo?

All flight searches from Chicago to Ontario on momondo can be filtered to show those which offer flexible booking policies.

How can momondo help me find flights from Chicago to Ontario?

momondo helps you find the best flight between Chicago and Ontario by providing filters to narrow your choice of flights to those matching your criteria. You can select flights based on numerous factors such as price, departure and landing times, airport and airline.

I’m not ready to book a flight from Chicago to Ontario right now. Can momondo alert me if prices change?

If you are simply researching potential flights to Ontario, momondo offers a useful price alert feature which will track prices for flights to Ontario from Chicago and alert you when they change.

An easier way to manage your Ontario trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.
Start using Trips
Find my bookings

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.
1 adult
Sat 2/28
Sat 3/7
By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to the United States