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Cheap flights from Chicago to Los Angeles from $51

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 1/12. 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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Frontier Logo
6:07 pm - 1:39 pm
ORD
-
ONT
21h 32m1 stop
Frontier Logo
6:49 pm - 9:11 pm
ONT
-
ORD
24h 22m1 stop
$137Frontier
Thu, Jan 8 - Wed, Jan 14
Multiple Airlines Logo
3:22 pm - 9:23 pm
ORD
-
ONT
8h 01m1 stop
Multiple Airlines Logo
8:31 am - 12:42 am
ONT
-
ORD
14h 11m1 stop
$141Multiple Airlines
Fri, Jan 9 - Mon, Jan 12
Frontier Logo
10:41 pm - 7:37 am
ORD
-
ONT
10h 56m1 stop
Frontier Logo
6:20 am - 6:31 pm
ONT
-
ORD
10h 11m1 stop
$145Frontier
Sun, Jan 18 - Thu, Jan 29
Frontier Logo
6:07 pm - 1:39 pm
ORD
-
ONT
21h 32m1 stop
Frontier Logo
6:49 pm - 7:36 pm
ONT
-
ORD
22h 47m2 stops
$148Frontier
Thu, Jan 8 - Wed, Jan 14
Frontier Logo
8:40 am - 4:26 pm
ORD
-
ONT
9h 46m1 stop
Frontier Logo
7:15 am - 10:57 am
ONT
-
ORD
25h 42m1 stop
$149Frontier
Sun, Feb 1 - Sat, Feb 7
Multiple Airlines Logo
10:41 pm - 7:37 am
ORD
-
ONT
10h 56m1 stop
Multiple Airlines Logo
1:46 pm - 2:17 pm
ONT
-
ORD
22h 31m1 stop
$170Multiple Airlines
Sun, Jan 18 - Fri, Jan 30
Southwest Logo
8:10 am - 10:40 am
MDW
-
ONT
4h 30mnonstop
Southwest Logo
6:50 am - 12:40 pm
ONT
-
MDW
3h 50mnonstop
$199Southwest
Thu, Jan 8 - Wed, Jan 14
Southwest Logo
5:35 pm - 9:45 pm
MDW
-
ONT
6h 10m1 stop
Southwest Logo
6:50 am - 12:40 pm
ONT
-
MDW
3h 50mnonstop
$209Southwest
Thu, Jan 8 - Wed, Jan 14
Southwest Logo
8:10 am - 10:40 am
MDW
-
ONT
4h 30mnonstop
Southwest Logo
6:05 am - 6:45 pm
ONT
-
MDW
10h 40m2 stops
$214Southwest
Thu, Jan 8 - Wed, Jan 14
Southwest Logo
8:00 am - 12:50 pm
MDW
-
ONT
6h 50m1 stop
Southwest Logo
1:00 pm - 10:40 pm
ONT
-
MDW
7h 40m1 stop
$219Southwest
Thu, Feb 26 - Tue, Mar 3

Frontier flights from Chicago to Ontario

Our best Frontier deals on Chicago to Ontario flight tickets
Frontier
Jan 8
ORD6:07 pmChicago O'Hare Intl
21h 32m
1 stop
ONT1:39 pmOntario
Jan 14
ONT6:49 pmOntario
24h 22m
1 stop
ORD9:11 pmChicago O'Hare Intl
$137
Find similar
Frontier
Jan 18
ORD10:41 pmChicago O'Hare Intl
10h 56m
1 stop
ONT7:37 amOntario
Jan 29
ONT6:20 amOntario
10h 11m
1 stop
ORD6:31 pmChicago O'Hare Intl
$145
Find similar
Frontier
Jan 8
ORD6:07 pmChicago O'Hare Intl
21h 32m
1 stop
ONT1:39 pmOntario
Jan 14
ONT6:49 pmOntario
22h 47m
2 stops
ORD7:36 pmChicago O'Hare Intl
$148
Find similar

Southwest flights from Chicago to Ontario

Our best Southwest deals on Chicago to Ontario flight tickets
Southwest
Jan 8
MDW8:10 amChicago Midway
4h 30m
ONT10:40 amOntario
Jan 14
ONT6:50 amOntario
3h 50m
MDW12:40 pmChicago Midway
$199
Find similar
Southwest
Jan 8
MDW5:35 pmChicago Midway
6h 10m
1 stop
ONT9:45 pmOntario
Jan 14
ONT6:50 amOntario
3h 50m
MDW12:40 pmChicago Midway
$209
Find similar
Southwest
Jan 8
MDW8:10 amChicago Midway
4h 30m
ONT10:40 amOntario
Jan 14
ONT6:05 amOntario
10h 40m
2 stops
MDW6:45 pmChicago Midway
$214
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 5, 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 1/8

6:07 pm-1:39 pm

1 stop21h 32m

Ontario

Wed 1/14

6:49 pm-9:11 pm

1 stop24h 22m

$137

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Fri 1/9

3:22 pm-9:23 pm

1 stop8h 01m

Ontario

Mon 1/12

8:31 am-12:42 am

1 stop14h 11m

$141

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Sun 1/18

10:41 pm-7:37 am

1 stop10h 56m

Ontario

Thu 1/29

6:20 am-6:31 pm

1 stop10h 11m

$145

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Thu 1/8

6:07 pm-1:39 pm

1 stop21h 32m

Ontario

Wed 1/14

6:49 pm-7:36 pm

2 stops22h 47m

$148

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Sun 2/1

8:40 am-4:26 pm

1 stop9h 46m

Ontario

Sat 2/7

7:15 am-10:57 am

1 stop25h 42m

$149

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Sun 1/18

10:41 pm-7:37 am

1 stop10h 56m

Ontario

Fri 1/30

1:46 pm-2:17 pm

1 stop22h 31m

$170

ChicagoOntario

MDW - ONT

MDWONT

Chicago Midway

Thu 1/8

8:10 am-10:40 am

Nonstop4h 30m

Ontario

Wed 1/14

6:50 am-12:40 pm

Nonstop3h 50m

$199

ChicagoOntario

MDW - ONT

MDWONT

Chicago Midway

Thu 1/8

5:35 pm-9:45 pm

1 stop6h 10m

Ontario

Wed 1/14

6:50 am-12:40 pm

Nonstop3h 50m

$209

ChicagoOntario

MDW - ONT

MDWONT

Chicago Midway

Thu 1/8

8:10 am-10:40 am

Nonstop4h 30m

Ontario

Wed 1/14

6:05 am-6:45 pm

2 stops10h 40m

$214

ChicagoOntario

MDW - ONT

MDWONT

Chicago Midway

Thu 2/26

8:00 am-12:50 pm

1 stop6h 50m

Ontario

Tue 3/3

1:00 pm-10:40 pm

1 stop7h 40m

$219

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 February instead. Flights to Ontario in February, while not as cheap as those in October, still average around $263.

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 $383. 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 to Ontario for around $492.

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 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 $281 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.

How have Chicago to Ontario flight prices changed over time?

As of December 2025, prices for Chicago to Ontario flights are approximately 41% 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

$300

Fastest flight time

4h 15m

Direct flights

Every day

Airports in Ontario

1 airport
The best one-way flight to Ontario from Chicago in the past 72 hours is $300. The best round-trip flight deal from Chicago to Ontario found on momondo in the last 72 hours is $511.
The fastest flight from Chicago to Ontario takes 4h 15m
Direct flights go from Chicago to Ontario every day.
There is 1 airport near Ontario: 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 30m.

  • 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
5.8
3,090 reviews
Search Frontier flights
American AirlinesPriceFrom $231Free CancellationRating
7.2
11,043 reviews
Search American Airlines flights
United AirlinesPriceFrom $237Free CancellationRating
7.4
9,065 reviews
Search United Airlines flights
SouthwestPriceFrom $246Free CancellationRating
8.0
4,251 reviews
Search Southwest flights
DeltaPriceFrom $256Free CancellationRating
7.9
8,009 reviews
Search Delta flights

  • Southwest Flights From Chicago to Ontario

    Across 5 Southwest flights from Chicago to Ontario this week, the average price was $423, with the best Southwest deals starting from $246 round-trip. 4,251 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, 9,065 ratings). United Airlines flies from Chicago to Ontario around 7 times per week, with deals starting from $237 round-trip and rising to an average price of around $435.

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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