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Cheap flights from Chicago O'Hare Intl Airport to Los Angeles from $78

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 11/16. 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

Frontier Logo
8:25 am - 7:23 amORD-ONT
24h 58m1 stop
Frontier Logo
7:04 am - 11:53 pmONT-ORD
14h 49m1 stop
$143Frontier
Find Deal
Sat, Oct 4 - Tue, Oct 7
Frontier Logo
6:50 am - 11:50 pmORD-ONT
19h 00m1 stop
Frontier Logo
6:53 am - 12:12 amONT-ORD
15h 19m1 stop
$148Frontier
Find Deal
Thu, Oct 23 - Wed, Oct 29
Frontier Logo
6:00 am - 11:10 amORD-ONT
7h 10m1 stop
Frontier Logo
4:05 pm - 12:15 amONT-ORD
6h 10m1 stop
$149Frontier
Find Deal
Thu, Oct 30 - Mon, Nov 3
Frontier Logo
7:05 am - 11:50 pmORD-ONT
18h 45m1 stop
Frontier Logo
8:34 am - 11:59 pmONT-ORD
13h 25m1 stop
$153Frontier
Find Deal
Sat, Oct 11 - Sat, Oct 18
Frontier Logo
7:05 am - 11:50 pmORD-ONT
18h 45m1 stop
Frontier Logo
8:34 am - 11:59 pmONT-ORD
13h 25m1 stop
$154Frontier
Find Deal
Sat, Oct 11 - Sat, Oct 18
Frontier Logo
6:50 am - 11:50 pmORD-ONT
19h 00m1 stop
Frontier Logo
12:32 pm - 12:44 amONT-ORD
10h 12m1 stop
$155Frontier
Find Deal
Thu, Oct 16 - Mon, Oct 20
Frontier Logo
7:15 am - 11:10 amORD-ONT
5h 55m1 stop
Frontier Logo
4:05 pm - 12:15 amONT-ORD
6h 10m1 stop
$156Frontier
Find Deal
Sat, Nov 1 - Fri, Nov 7
Frontier Logo
1:36 pm - 6:49 pmORD-ONT
7h 13m1 stop
Frontier Logo
4:05 pm - 12:15 amONT-ORD
6h 10m1 stop
$157Frontier
Find Deal
Fri, Nov 7 - Mon, Nov 10
Multiple Airlines Logo
8:50 pm - 6:27 amORD-ONT
11h 37m1 stop
Multiple Airlines Logo
6:53 am - 12:12 amONT-ORD
15h 19m1 stop
$200Multiple Airlines
Find Deal
Wed, Nov 12 - Tue, Nov 18
Multiple Airlines Logo
11:15 am - 9:56 pmORD-ONT
12h 41m1 stop
Multiple Airlines Logo
12:28 pm - 10:45 pmONT-ORD
8h 17m1 stop
$202Multiple Airlines
Find Deal
Wed, Oct 1 - Sun, Oct 5

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
Oct 4
ORD8:25 amChicago O'Hare Intl
24h 58m
1 stop
ONT7:23 amOntario
Oct 7
ONT7:04 amOntario
14h 49m
1 stop
ORD11:53 pmChicago O'Hare Intl
$143
Find similar
Frontier
Oct 23
ORD6:50 amChicago O'Hare Intl
19h 00m
1 stop
ONT11:50 pmOntario
Oct 29
ONT6:53 amOntario
15h 19m
1 stop
ORD12:12 amChicago O'Hare Intl
$148
Find similar
Frontier
Oct 30
ORD6:00 amChicago O'Hare Intl
7h 10m
1 stop
ONT11:10 amOntario
Nov 3
ONT4:05 pmOntario
6h 10m
1 stop
ORD12:15 amChicago O'Hare Intl
$149
Find similar

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 September 16, 2025.
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

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Sat 10/4

8:25 am-7:23 am

1 stop24h 58m

Ontario

Tue 10/7

7:04 am-11:53 pm

1 stop14h 49m

$143

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Thu 10/23

6:50 am-11:50 pm

1 stop19h 00m

Ontario

Wed 10/29

6:53 am-12:12 am

1 stop15h 19m

$148

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Thu 10/30

6:00 am-11:10 am

1 stop7h 10m

Ontario

Mon 11/3

4:05 pm-12:15 am

1 stop6h 10m

$149

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Sat 10/11

7:05 am-11:50 pm

1 stop18h 45m

Ontario

Sat 10/18

8:34 am-11:59 pm

1 stop13h 25m

$153

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Sat 10/11

7:05 am-11:50 pm

1 stop18h 45m

Ontario

Sat 10/18

8:34 am-11:59 pm

1 stop13h 25m

$154

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Thu 10/16

6:50 am-11:50 pm

1 stop19h 00m

Ontario

Mon 10/20

12:32 pm-12:44 am

1 stop10h 12m

$155

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Sat 11/1

7:15 am-11:10 am

1 stop5h 55m

Ontario

Fri 11/7

4:05 pm-12:15 am

1 stop6h 10m

$156

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Fri 11/7

1:36 pm-6:49 pm

1 stop7h 13m

Ontario

Mon 11/10

4:05 pm-12:15 am

1 stop6h 10m

$157

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Wed 11/12

8:50 pm-6:27 am

1 stop11h 37m

Ontario

Tue 11/18

6:53 am-12:12 am

1 stop15h 19m

$200

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Wed 10/1

11:15 am-9:56 pm

1 stop12h 41m

Ontario

Sun 10/5

12:28 pm-10:45 pm

1 stop8h 17m

$202

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 February instead. Flights to Ontario in February, while not as cheap as those in April, still average around $253.

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 Thursday 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 Monday, 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 $485.

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

In the evening 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 $361. Flying to Ontario in the evening 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 $462 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 $335 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 $273 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 38% 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 September 2025, prices for Chicago O'Hare Intl Airport to Ontario flights are approximately 36% 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

$182

Fastest flight time

4h 30m

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 $182. The best round-trip flight deal from Chicago O'Hare Intl Airport to Ontario found on momondo in the last 72 hours is $329.
The fastest flight from Chicago O'Hare Intl Airport to Ontario takes 4h 30m
Direct flights go from Chicago O'Hare Intl Airport to Ontario every day.
There is 1 airport near Ontario: 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. 5h 55m 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 $124Free CancellationRating
5.8
3,174 reviews
Search Frontier flights
American AirlinesPriceFrom $231Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
United AirlinesPriceFrom $237Free CancellationRating
7.4
8,924 reviews
Search United Airlines flights
SouthwestPriceFrom $246Free CancellationRating
8.0
4,242 reviews
Search Southwest flights
DeltaPriceFrom $256Free CancellationRating
7.9
7,957 reviews
Search Delta flights

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

    United Airlines operates around 7 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 $427, but momondo users have found United Airlines deals from Chicago O'Hare Intl Airport to Ontario from as low as $237 round-trip. United Airlines has been scored 7.4/10 in 8,924 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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