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Cheap flights from Chicago O'Hare Intl Airport to Los Angeles from $98

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 O'Hare Intl Airport to Los Angeles departing on 5/27. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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Find the cheapest flights from Chicago O'Hare Intl Airport to Los Angeles

Cheap round-trip flights

Enter your travel dates to find the best prices.
Frontier Logo
3:50 pm - 8:04 am
ORD
-
ONT
18h 14m
2 stops
Frontier Logo
9:02 pm - 6:20 am
ONT
-
ORD
7h 18m
1 stop
$317Frontier
Thu, Apr 9 - Mon, Apr 13
Frontier Logo
3:50 pm - 8:07 pm
ORD
-
ONT
30h 17m
2 stops
Frontier Logo
9:02 pm - 6:20 am
ONT
-
ORD
7h 18m
1 stop
$318Frontier
Thu, Apr 9 - Mon, Apr 13
Frontier Logo
8:55 pm - 7:12 am
ORD
-
ONT
12h 17m
1 stop
Frontier Logo
6:20 am - 2:19 pm
ONT
-
ORD
5h 59m
1 stop
$320Frontier
Sat, Mar 28 - Wed, Apr 1
Frontier Logo
4:28 pm - 10:44 am
ORD
-
ONT
20h 16m
2 stops
Frontier Logo
12:59 am - 9:45 am
ONT
-
ORD
6h 46m
1 stop
$321Frontier
Fri, Apr 17 - Sat, Apr 18
Multiple Airlines Logo
9:42 pm - 10:05 am
ORD
-
ONT
14h 23m
1 stop
Multiple Airlines Logo
8:06 pm - 10:46 am
ONT
-
ORD
12h 40m
2 stops
$322Multiple Airlines
Fri, May 15 - Sun, May 17
Frontier Logo
8:58 pm - 10:14 am
ORD
-
ONT
15h 16m
1 stop
Frontier Logo
7:44 pm - 6:08 am
ONT
-
ORD
8h 24m
1 stop
$323Frontier
Sun, Apr 19 - Sat, Apr 25
Frontier Logo
8:55 pm - 1:28 pm
ORD
-
ONT
18h 33m
1 stop
Frontier Logo
6:20 am - 2:19 pm
ONT
-
ORD
5h 59m
1 stop
$324Frontier
Mon, Mar 30 - Wed, Apr 8
Multiple Airlines Logo
4:36 pm - 11:39 am
ORD
-
ONT
21h 03m
2 stops
Multiple Airlines Logo
12:59 am - 9:45 am
ONT
-
ORD
6h 46m
1 stop
$325Multiple Airlines
Fri, Apr 3 - Sat, May 2
Frontier Logo
9:30 am - 7:11 pm
ORD
-
ONT
11h 41m
1 stop
Frontier Logo
10:50 am - 8:37 pm
ONT
-
ORD
7h 47m
1 stop
$326Frontier
Fri, May 29 - Mon, Jun 1
Frontier Logo
8:55 pm - 11:56 pm
ORD
-
ONT
29h 01m
2 stops
Frontier Logo
11:44 am - 6:08 am
ONT
-
ORD
16h 24m
1 stop
$327Frontier
Tue, Mar 31 - Tue, Apr 14

Frontier flights from Chicago O'Hare Intl Airport to Ontario

Our best Frontier deals on Chicago O'Hare Intl Airport to Ontario flight tickets
Frontier
Apr 9
ORD3:50 pmChicago O'Hare Intl
18h 14m
2 stops
ONT8:04 amOntario
Apr 13
ONT9:02 pmOntario
7h 18m
1 stop
ORD6:20 amChicago O'Hare Intl
$317
Frontier
Apr 9
ORD3:50 pmChicago O'Hare Intl
30h 17m
2 stops
ONT8:07 pmOntario
Apr 13
ONT9:02 pmOntario
7h 18m
1 stop
ORD6:20 amChicago O'Hare Intl
$318
Frontier
Mar 28
ORD8:55 pmChicago O'Hare Intl
12h 17m
1 stop
ONT7:12 amOntario
Apr 1
ONT6:20 amOntario
5h 59m
1 stop
ORD2:19 pmChicago O'Hare Intl
$320

Southwest flights from Chicago O'Hare Intl Airport to Ontario

Our best Southwest deals on Chicago O'Hare Intl Airport to Ontario flight tickets
Southwest
Apr 6
ORD4:55 pmChicago O'Hare Intl
9h 15m
2 stops
ONT12:10 amOntario
Apr 14
ONT10:30 amOntario
10h 25m
2 stops
ORD10:55 pmChicago O'Hare Intl
$347
Southwest
May 28
ORD4:50 pmChicago O'Hare Intl
5h 50m
1 stop
ONT8:40 pmOntario
Jun 1
ONT1:55 pmOntario
8h 00m
2 stops
ORD11:55 pmChicago O'Hare Intl
$352

momondo Fare Finder

 
Customize your flight search to find flights from Chicago O'Hare Intl Airport 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 March 16, 2026.
Use the filters below to find and compare flights from Chicago O'Hare Intl Airport to Ontario that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Thu 4/9

3:50 pm-8:04 am

2 stops18h 14m

Ontario

Mon 4/13

9:02 pm-6:20 am

1 stop7h 18m

$317

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Thu 4/9

3:50 pm-8:07 pm

2 stops30h 17m

Ontario

Mon 4/13

9:02 pm-6:20 am

1 stop7h 18m

$318
Quickest round-trip

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Sat 3/28

8:55 pm-7:12 am

1 stop12h 17m

Ontario

Wed 4/1

6:20 am-2:19 pm

1 stop5h 59m

$320

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Fri 4/17

4:28 pm-10:44 am

2 stops20h 16m

Ontario

Sat 4/18

12:59 am-9:45 am

1 stop6h 46m

$321

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Fri 5/15

9:42 pm-10:05 am

1 stop14h 23m

Ontario

Sun 5/17

8:06 pm-10:46 am

2 stops12h 40m

$322

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Sun 4/19

8:58 pm-10:14 am

1 stop15h 16m

Ontario

Sat 4/25

7:44 pm-6:08 am

1 stop8h 24m

$323

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Mon 3/30

8:55 pm-1:28 pm

1 stop18h 33m

Ontario

Wed 4/8

6:20 am-2:19 pm

1 stop5h 59m

$324

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Fri 4/3

4:36 pm-11:39 am

2 stops21h 03m

Ontario

Sat 5/2

12:59 am-9:45 am

1 stop6h 46m

$325

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Fri 5/29

9:30 am-7:11 pm

1 stop11h 41m

Ontario

Mon 6/1

10:50 am-8:37 pm

1 stop7h 47m

$326

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Tue 3/31

8:55 pm-11:56 pm

2 stops29h 01m

Ontario

Tue 4/14

11:44 am-6:08 am

1 stop16h 24m

$327

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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How to get the cheapest flight ticket from Chicago O'Hare Intl Airport 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 cheapest month to fly to Ontario?

In general, April is the cheapest month to fly from Chicago O'Hare Intl Airport to Ontario. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $246. If you aren’t able to travel during the month of April, then book flights to Ontario from Chicago O'Hare Intl Airport during May instead. Flights to Ontario in May, while not as cheap as those in April, still average around $317.

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 Wednesday when prices can be found for as low as $434. 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 O'Hare Intl Airport to Ontario for around $511.

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 O'Hare Intl Airport to Ontario when you can find flight prices for as low as $417. 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 $538 on average. Flights to Ontario from Chicago O'Hare Intl Airport in the morning are generally more expensive because this time of day is more convenient for travelers’ schedules.

What is the cheapest Chicago O'Hare Intl to Ontario flight route?

Fly from Chicago O'Hare Intl to Ontario for the best Chicago O'Hare Intl - 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 O'Hare Intl Airport when booking weeks ahead of your departure date. In general, you can expect to find flights to Ontario for around $399 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Ontario from Chicago O'Hare Intl Airport for as low as $227 on momondo.

What cabin class options are available on Chicago O'Hare Intl to Ontario flights?

There are 4 cabin classes available to choose from on Chicago O'Hare Intl 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 O'Hare Intl Airport to Ontario flights?

You could potentially save up to 25% on your flight if you consider stops on a Chicago O'Hare Intl Airport to Ontario flight.

How have Chicago O'Hare Intl Airport to Ontario flight prices changed over time?

As of March 2026, prices for Chicago O'Hare Intl Airport to Ontario flights are approximately 65% more expensive when compared to flights at the same time last year.

When to book flights from Chicago O'Hare Intl Airport to Ontario

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

Cheap Chicago O'Hare Intl Airport to Ontario (ORD to ONT) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Chicago O'Hare Intl Airport to Ontario

Best Price Found

$173

Fastest flight time

4h 26m

Direct flights

Every day

Airports in Ontario

1 airport
The best one-way flight to Ontario from Chicago O'Hare Intl Airport in the past 72 hours is $173. The best round-trip flight deal from Chicago O'Hare Intl Airport to Ontario found on momondo in the last 72 hours is $394.
The fastest flight from Chicago O'Hare Intl Airport to Ontario takes 4h 26m
Direct flights go from Chicago O'Hare Intl Airport to Ontario every day.
There is 1 airport in Ontario. From Chicago O'Hare Intl Airport there are direct flights to Ontario (ONT).
Search flight deals

  • How far is Chicago O'Hare Intl to Ontario by plane?

    A flight from Chicago O'Hare Intl to Ontario will travel around 1697.7 mi. 4h 26m is a normal flight duration for this route.

  • When did momondo last update prices for flights from Chicago O'Hare Intl Airport to Ontario Airport?

    Prices for flights from Chicago O'Hare Intl Airport to Ontario Airport refresh daily.

  • How many operators does momondo search for flights from Chicago O'Hare Intl Airport to Ontario Airport?

  • How old do you have to be to fly from Chicago O'Hare Intl Airport 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 O'Hare Intl Airport to Ontario Airport.

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

    The travel and health documents you'll need for your trip to Ontario Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Ontario Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

  • What is the most popular plane model from Chicago O'Hare Intl Airport to Ontario?

  • What is the most popular airline from Chicago O'Hare Intl Airport to Ontario?

Best airlines flying from Chicago O'Hare Intl Airport to Ontario

Compare and see reviews for airlines that fly from Chicago O'Hare Intl Airport to Ontario with momondo
Airline
Rating
Free Cancellation
Price
FrontierPriceFrom $127Free CancellationRating
5.7
3,031 reviews
Search Frontier flights
SouthwestPriceFrom $246Free CancellationRating
8.0
4,318 reviews
Search Southwest flights
American AirlinesPriceFrom $246Free CancellationRating
7.1
11,467 reviews
Search American Airlines flights
DeltaPriceFrom $256Free CancellationRating
7.9
8,296 reviews
Search Delta flights
United AirlinesPriceFrom $263Free CancellationRating
7.4
9,428 reviews
Search United Airlines flights

  • United Airlines Flights From Chicago O'Hare Intl Airport to Ontario

    United Airlines operates around 5 flights from Chicago O'Hare Intl Airport to Ontario every week. The average price of these flights found in the last 72 hours has been $453, but momondo users have found United Airlines deals from Chicago O'Hare Intl Airport to Ontario from as low as $263 round-trip. United Airlines has been scored 7.4/10 in 9,428 reviews.

Why use momondo?

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

Finding the right flight to Ontario from Chicago is quick and easy when you have a range of options in front of you, from reputable agents and recognisable airlines. Options that can then be filtered down to find the best fit. That is what momondo does. We make finding flights to Ontario quick and easy, saving you time and money.

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

Yes. All flights to Ontario from Chicago on momondo can be compared and filtered by various policies on offer, including flexible booking.

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

momondo provides multiple filters to help you find the best flight to Ontario from Chicago. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.

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

Yes. momondo can track prices for Chicago to Ontario flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.

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