Latest deals
Insights
When to book
FAQs
Reviews
Price Alerts

Cheap flights from Chicago to Los Angeles from $64

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 1/25. 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
11:51 am - 6:27 pm
ORD
-
ONT
8h 36m1 stop
Frontier Logo
8:21 am - 11:17 pm
ONT
-
ORD
12h 56m1 stop
$165Frontier
Thu, Feb 19 - Sat, Feb 28
Frontier Logo
12:07 pm - 12:20 am
ORD
-
ONT
14h 13m1 stop
Frontier Logo
7:15 am - 10:57 am
ONT
-
ORD
25h 42m1 stop
$180Frontier
Fri, Jan 30 - Sat, Jan 31
Frontier Logo
3:00 pm - 11:56 pm
MDW
-
ONT
10h 56m1 stop
Frontier Logo
8:02 am - 5:20 pm
ONT
-
MDW
7h 18m1 stop
$182Frontier
Mon, Jan 12 - Thu, Jan 15
Frontier Logo
10:32 pm - 2:54 pm
ORD
-
ONT
18h 22m1 stop
Frontier Logo
6:49 pm - 9:11 pm
ONT
-
ORD
24h 22m1 stop
$182Frontier
Thu, Jan 8 - Wed, Jan 14
Frontier Logo
10:37 pm - 5:54 pm
ORD
-
ONT
21h 17m1 stop
Frontier Logo
6:49 pm - 9:11 pm
ONT
-
ORD
24h 22m1 stop
$183Frontier
Mon, Jan 12 - Wed, Jan 14
Frontier Logo
9:05 am - 1:52 pm
ORD
-
ONT
30h 47m2 stops
Frontier Logo
8:21 am - 11:17 pm
ONT
-
ORD
12h 56m1 stop
$188Frontier
Tue, Feb 10 - Sat, Feb 21
Frontier Logo
9:05 am - 1:52 pm
ORD
-
ONT
30h 47m2 stops
Frontier Logo
2:08 pm - 11:14 pm
ONT
-
ORD
7h 06m1 stop
$192Frontier
Tue, Feb 10 - Thu, Feb 12
Frontier Logo
3:00 pm - 11:56 pm
MDW
-
ONT
10h 56m1 stop
Frontier Logo
8:02 am - 5:20 pm
ONT
-
MDW
7h 18m1 stop
$197Frontier
Mon, Jan 12 - Thu, Jan 15
Frontier Logo
7:50 pm - 11:56 pm
ORD
-
ONT
6h 06m1 stop
Frontier Logo
2:34 pm - 9:11 pm
ONT
-
ORD
28h 37m1 stop
$197Frontier
Mon, Jan 12 - Thu, Jan 15
Frontier Logo
2:35 pm - 11:59 pm
ORD
-
ONT
11h 24m1 stop
Frontier Logo
6:43 pm - 5:03 pm
ONT
-
ORD
44h 20m2 stops
$198Frontier
Fri, Feb 27 - Mon, Mar 2

Frontier flights from Chicago to Ontario

Our best Frontier deals on Chicago to Ontario flight tickets
Frontier
Feb 19
ORD11:51 amChicago O'Hare Intl
8h 36m
1 stop
ONT6:27 pmOntario
Feb 28
ONT8:21 amOntario
12h 56m
1 stop
ORD11:17 pmChicago O'Hare Intl
$165
Find similar
Frontier
Jan 30
ORD12:07 pmChicago O'Hare Intl
14h 13m
1 stop
ONT12:20 amOntario
Jan 31
ONT7:15 amOntario
25h 42m
1 stop
ORD10:57 amChicago O'Hare Intl
$180
Find similar
Frontier
Jan 8
ORD10:32 pmChicago O'Hare Intl
18h 22m
1 stop
ONT2:54 pmOntario
Jan 14
ONT6:49 pmOntario
24h 22m
1 stop
ORD9:11 pmChicago O'Hare Intl
$182
Find similar

Delta flights from Chicago to Ontario

Our best Delta deals on Chicago to Ontario flight tickets
Delta
Feb 25
MDW12:45 pmChicago Midway
10h 20m
1 stop
ONT9:05 pmOntario
Mar 2
ONT10:20 pmOntario
9h 34m
1 stop
MDW9:54 amChicago Midway
$406
Find similar
Delta
Feb 21
MDW6:00 amChicago Midway
8h 02m
1 stop
ONT12:02 pmOntario
Mar 2
ONT10:20 pmOntario
9h 34m
1 stop
MDW9:54 amChicago Midway
$409
Find similar
Delta
Feb 25
MDW9:34 amChicago Midway
13h 31m
2 stops
ONT9:05 pmOntario
Mar 2
ONT10:20 pmOntario
9h 34m
1 stop
MDW9:54 amChicago Midway
$411
Find similar

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 December 28, 2025.
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 2/19

11:51 am-6:27 pm

1 stop8h 36m

Ontario

Sat 2/28

8:21 am-11:17 pm

1 stop12h 56m

$165

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Fri 1/30

12:07 pm-12:20 am

1 stop14h 13m

Ontario

Sat 1/31

7:15 am-10:57 am

1 stop25h 42m

$180

ChicagoOntario

MDW - ONT

MDWONT

Chicago Midway

Mon 1/12

3:00 pm-11:56 pm

1 stop10h 56m

Ontario

Thu 1/15

8:02 am-5:20 pm

1 stop7h 18m

$182

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Thu 1/8

10:32 pm-2:54 pm

1 stop18h 22m

Ontario

Wed 1/14

6:49 pm-9:11 pm

1 stop24h 22m

$182

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Mon 1/12

10:37 pm-5:54 pm

1 stop21h 17m

Ontario

Wed 1/14

6:49 pm-9:11 pm

1 stop24h 22m

$183

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Tue 2/10

9:05 am-1:52 pm

2 stops30h 47m

Ontario

Sat 2/21

8:21 am-11:17 pm

1 stop12h 56m

$188

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Tue 2/10

9:05 am-1:52 pm

2 stops30h 47m

Ontario

Thu 2/12

2:08 pm-11:14 pm

1 stop7h 06m

$192

ChicagoOntario

MDW - ONT

MDWONT

Chicago Midway

Mon 1/12

3:00 pm-11:56 pm

1 stop10h 56m

Ontario

Thu 1/15

8:02 am-5:20 pm

1 stop7h 18m

$197

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Mon 1/12

7:50 pm-11:56 pm

1 stop6h 06m

Ontario

Thu 1/15

2:34 pm-9:11 pm

1 stop28h 37m

$197

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Fri 2/27

2:35 pm-11:59 pm

1 stop11h 24m

Ontario

Mon 3/2

6:43 pm-5:03 pm

2 stops44h 20m

$198

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 February instead. Flights to Ontario in February, while not as cheap as those in October, still average around $281.

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 Tuesday when prices can be found for as low as $330. This is often the case because there is less demand to fly during this day of the week. When flying out on a Saturday, 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 $499 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 O'Hare Intl 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 $366 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 17% 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 December 2025, prices for Chicago to Ontario flights are approximately 16% 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

$266

Fastest flight time

4h 20m

Direct flights

Every day

Airports in Ontario

1 airport
The best one-way flight to Ontario from Chicago in the past 72 hours is $266. The best round-trip flight deal from Chicago to Ontario found on momondo in the last 72 hours is $372.
The fastest flight from Chicago to Ontario takes 4h 20m
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 20m.

  • 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 $125Free CancellationRating
5.7
3,065 reviews
Search Frontier flights
American AirlinesPriceFrom $231Free CancellationRating
7.2
11,072 reviews
Search American Airlines flights
United AirlinesPriceFrom $237Free CancellationRating
7.4
9,113 reviews
Search United Airlines flights
SouthwestPriceFrom $246Free CancellationRating
8.0
4,256 reviews
Search Southwest flights
DeltaPriceFrom $256Free CancellationRating
7.9
8,019 reviews
Search Delta flights

  • Southwest Flights From Chicago to Ontario

    Across 5 Southwest flights from Chicago to Ontario this week, the average price was $439, with the best Southwest deals starting from $246 round-trip. 4,256 users have rated Southwest on momondo, with an average score of 8.0/10.

  • United Airlines Flights From Chicago to Ontario

    Another popular option for Chicago to Ontario flights is United Airlines (7.4/10, 9,113 ratings). United Airlines flies from Chicago to Ontario around 5 times per week, with deals starting from $237 round-trip and rising to an average price of around $436.

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
Tue 1/27
Tue 2/3
By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to the United States