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Cheap flights from Chicago to Los Angeles from $67

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 3/11. 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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0 bags

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Find the cheapest flights from Chicago to Los Angeles

Cheap round-trip flights

Enter your travel dates to find the best prices.
Frontier Logo
5:30 am - 11:59 pm
ORD
-
ONT
20h 29m
2 stops
Frontier Logo
9:40 pm - 6:08 am
ONT
-
ORD
6h 28m
1 stop
$145Frontier
Sat, Mar 7 - Mon, Mar 9
Frontier Logo
11:51 am - 9:34 am
ORD
-
ONT
23h 43m
2 stops
Frontier Logo
2:23 pm - 6:08 am
ONT
-
ORD
13h 45m
1 stop
$167Frontier
Wed, Mar 4 - Tue, Mar 10
Frontier Logo
11:33 am - 9:34 pm
ORD
-
ONT
36h 01m
2 stops
Frontier Logo
9:40 pm - 6:08 am
ONT
-
ORD
6h 28m
1 stop
$169Frontier
Mon, Mar 2 - Mon, Mar 9
Frontier Logo
6:02 pm - 9:34 pm
ORD
-
ONT
29h 32m
2 stops
Frontier Logo
2:23 pm - 6:08 am
ONT
-
ORD
13h 45m
1 stop
$175Frontier
Tue, Mar 3 - Tue, Mar 10
Frontier Logo
7:00 am - 11:59 pm
ORD
-
ONT
18h 59m
2 stops
Frontier Logo
2:23 pm - 6:08 am
ONT
-
ORD
13h 45m
1 stop
$186Frontier
Tue, Mar 10 - Wed, Mar 11
Frontier Logo
8:30 am - 6:45 pm
ORD
-
ONT
12h 15m
1 stop
Frontier Logo
11:10 am - 6:47 am
ONT
-
ORD
17h 37m
1 stop
$187Frontier
Thu, Apr 9 - Mon, Apr 13
Frontier Logo
11:51 am - 9:34 am
ORD
-
ONT
23h 43m
2 stops
Frontier Logo
2:23 pm - 6:08 am
ONT
-
ORD
13h 45m
1 stop
$189Frontier
Wed, Mar 4 - Wed, Mar 11
Frontier Logo
12:50 pm - 8:07 pm
ORD
-
ONT
9h 17m
1 stop
Frontier Logo
7:29 pm - 6:47 am
ONT
-
ORD
9h 18m
1 stop
$190Frontier
Mon, Apr 13 - Wed, Apr 15
Delta Logo
12:47 pm - 9:00 pm
MDW
-
ONT
10h 13m
1 stop
Delta Logo
10:25 pm - 9:56 am
ONT
-
MDW
9h 31m
1 stop
$303Delta
Wed, Mar 11 - Tue, Mar 17
Delta Logo
1:10 pm - 11:51 pm
MDW
-
ONT
12h 41m
2 stops
Delta Logo
12:49 pm - 10:28 pm
ONT
-
MDW
7h 39m
1 stop
$308Delta
Wed, Apr 1 - Tue, Apr 14

Frontier flights from Chicago to Ontario

Our best Frontier deals on Chicago to Ontario flight tickets
Frontier
Mar 7
ORD5:30 amChicago O'Hare Intl
20h 29m
2 stops
ONT11:59 pmOntario
Mar 9
ONT9:40 pmOntario
6h 28m
1 stop
ORD6:08 amChicago O'Hare Intl
$145
Frontier
Mar 4
ORD11:51 amChicago O'Hare Intl
23h 43m
2 stops
ONT9:34 amOntario
Mar 10
ONT2:23 pmOntario
13h 45m
1 stop
ORD6:08 amChicago O'Hare Intl
$167
Frontier
Mar 2
ORD11:33 amChicago O'Hare Intl
36h 01m
2 stops
ONT9:34 pmOntario
Mar 9
ONT9:40 pmOntario
6h 28m
1 stop
ORD6:08 amChicago O'Hare Intl
$169

Delta flights from Chicago to Ontario

Our best Delta deals on Chicago to Ontario flight tickets
Delta
Mar 11
MDW12:47 pmChicago Midway
10h 13m
1 stop
ONT9:00 pmOntario
Mar 17
ONT10:25 pmOntario
9h 31m
1 stop
MDW9:56 amChicago Midway
$303
Delta
Apr 1
MDW1:10 pmChicago Midway
12h 41m
2 stops
ONT11:51 pmOntario
Apr 14
ONT12:49 pmOntario
7h 39m
1 stop
MDW10:28 pmChicago Midway
$308
Delta
Feb 24
MDW12:45 pmChicago Midway
10h 20m
1 stop
ONT9:05 pmOntario
Mar 7
ONT10:20 pmOntario
8h 36m
1 stop
MDW8:56 amChicago Midway
$309

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 February 3, 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

Sat 3/7

5:30 am-11:59 pm

2 stops20h 29m

Ontario

Mon 3/9

9:40 pm-6:08 am

1 stop6h 28m

$145

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Wed 3/4

11:51 am-9:34 am

2 stops23h 43m

Ontario

Tue 3/10

2:23 pm-6:08 am

1 stop13h 45m

$167

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Mon 3/2

11:33 am-9:34 pm

2 stops36h 01m

Ontario

Mon 3/9

9:40 pm-6:08 am

1 stop6h 28m

$169

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Tue 3/3

6:02 pm-9:34 pm

2 stops29h 32m

Ontario

Tue 3/10

2:23 pm-6:08 am

1 stop13h 45m

$175

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Tue 3/10

7:00 am-11:59 pm

2 stops18h 59m

Ontario

Wed 3/11

2:23 pm-6:08 am

1 stop13h 45m

$186

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Thu 4/9

8:30 am-6:45 pm

1 stop12h 15m

Ontario

Mon 4/13

11:10 am-6:47 am

1 stop17h 37m

$187

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Wed 3/4

11:51 am-9:34 am

2 stops23h 43m

Ontario

Wed 3/11

2:23 pm-6:08 am

1 stop13h 45m

$189

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Mon 4/13

12:50 pm-8:07 pm

1 stop9h 17m

Ontario

Wed 4/15

7:29 pm-6:47 am

1 stop9h 18m

$190

ChicagoOntario

MDW - ONT

MDWONT

Chicago Midway

Wed 3/11

12:47 pm-9:00 pm

1 stop10h 13m

Ontario

Tue 3/17

10:25 pm-9:56 am

1 stop9h 31m

$303

ChicagoOntario

MDW - ONT

MDWONT

Chicago Midway

Wed 4/1

1:10 pm-11:51 pm

2 stops12h 41m

Ontario

Tue 4/14

12:49 pm-10:28 pm

1 stop7h 39m

$308

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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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 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 June instead. Flights to Ontario in June, while not as cheap as those in October, still average around $323.

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 $373 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 37% 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 February 2026, prices for Chicago to Ontario flights are approximately 7% cheaper 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
3,051 reviews
Search Frontier flights
American AirlinesPriceFrom $231Free CancellationRating
7.2
11,216 reviews
Search American Airlines flights
United AirlinesPriceFrom $237Free CancellationRating
7.4
9,236 reviews
Search United Airlines flights
SouthwestPriceFrom $246Free CancellationRating
8.0
4,272 reviews
Search Southwest flights
DeltaPriceFrom $256Free CancellationRating
7.9
8,138 reviews
Search Delta flights

  • Southwest Flights From Chicago to Ontario

    Across 8 Southwest flights from Chicago to Ontario this week, the average price was $468, with the best Southwest deals starting from $246 round-trip. 4,271 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

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