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Cheap flights from Chicago to Los Angeles from $53

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 9/4. 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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Cheap round-trip flights

Frontier Logo
10:18 am - 3:24 pmMDW-ONT
7h 06m1 stop
Frontier Logo
12:19 pm - 8:52 pmONT-MDW
6h 33m1 stop
$114Frontier
Find Deal
jue., sep. 18 - lun., sep. 22
Frontier Logo
9:56 pm - 4:20 pmORD-ONT
20h 24m1 stop
Frontier Logo
5:13 pm - 9:06 pmONT-ORD
25h 53m1 stop
$122Frontier
Find Deal
lun., jul. 28 - sáb., ago. 2
Frontier Logo
10:42 am - 7:54 pmORD-ONT
11h 12m1 stop
Frontier Logo
12:19 pm - 11:58 pmONT-ORD
9h 39m1 stop
$130Frontier
Find Deal
jue., sep. 18 - lun., sep. 22
Frontier Logo
8:05 am - 7:14 pmMDW-ONT
13h 09m1 stop
Frontier Logo
12:04 pm - 9:51 pmONT-MDW
7h 47m1 stop
$130Frontier
Find Deal
sáb., ago. 2 - jue., ago. 21
Frontier Logo
9:56 pm - 4:20 pmORD-ONT
20h 24m1 stop
Frontier Logo
12:04 pm - 12:01 amONT-ORD
9h 57m1 stop
$133Frontier
Find Deal
lun., ago. 4 - jue., ago. 21
Frontier Logo
12:31 pm - 6:34 pmORD-ONT
8h 03m1 stop
Frontier Logo
12:04 pm - 12:01 amONT-ORD
9h 57m1 stop
$135Frontier
Find Deal
vie., ago. 22 - sáb., ago. 23
Frontier Logo
9:56 pm - 9:52 pmORD-ONT
25h 56m1 stop
Frontier Logo
12:59 am - 12:32 amONT-ORD
21h 33m1 stop
$136Frontier
Find Deal
lun., ago. 4 - mié., ago. 20
Frontier Logo
9:55 am - 7:14 pmORD-ONT
11h 19m1 stop
Frontier Logo
12:59 am - 12:32 amONT-ORD
21h 33m1 stop
$138Frontier
Find Deal
sáb., ago. 2 - mié., ago. 20
Frontier Logo
9:56 pm - 9:52 pmORD-ONT
25h 56m1 stop
Frontier Logo
12:59 am - 12:32 amONT-ORD
21h 33m1 stop
$139Frontier
Find Deal
lun., ago. 4 - mié., ago. 20
Southwest Logo
8:20 pm - 10:30 pmMDW-ONT
4h 10mnonstop
Southwest Logo
3:30 pm - 12:05 amONT-MDW
6h 35m1 stop
$307Southwest
Find Deal
jue., sep. 18 - lun., sep. 22

Frontier flights from Chicago to Ontario

Our best Frontier deals on Chicago to Ontario flight tickets
Frontier
Sep 18
MDW10:18 amChicago Midway
7h 06m
1 stop
ONT3:24 pmOntario
Sep 22
ONT12:19 pmOntario
6h 33m
1 stop
MDW8:52 pmChicago Midway
Frontier
Jul 28
ORD9:56 pmChicago O'Hare Intl
20h 24m
1 stop
ONT4:20 pmOntario
Aug 2
ONT5:13 pmOntario
25h 53m
1 stop
ORD9:06 pmChicago O'Hare Intl
Frontier
Sep 18
ORD10:42 amChicago O'Hare Intl
11h 12m
1 stop
ONT7:54 pmOntario
Sep 22
ONT12:19 pmOntario
9h 39m
1 stop
ORD11:58 pmChicago O'Hare Intl

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, November 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 $148. If you aren’t able to travel during the month of November, then book flights to Ontario from Chicago during September instead. Flights to Ontario in September, while not as cheap as those in November, still average around $166.

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 Monday, the most expensive travel day of the week, you can expect to see flight prices from Chicago 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 to Ontario when you can find flight prices for as low as $317. 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 afternoon when prices are $449 on average. Flights to Ontario from Chicago in the afternoon 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 $312 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 $254 on momondo.

What cabin class options are available on Chicago to Ontario flights?

There are 3 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 23% 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 July 2025, prices for Chicago to Ontario flights are approximately 17% 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

$53

Fastest flight time

4h 10m

Direct flights

Every day

Airports in Ontario

1 airport
The best one-way flight to Ontario from Chicago in the past 72 hours is $53. The best round-trip flight deal from Chicago to Ontario found on momondo in the last 72 hours is $114.
The fastest flight from Chicago to Ontario takes 4h 10m
Direct flights go from Chicago to Ontario every day.
There is 1 airport near Ontario: Ontario (ONT)

  • 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 10m.

  • 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 $122Free CancellationRating
5.9
3,286 reviews
Search Frontier flights
American AirlinesPriceFrom $231Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
United AirlinesPriceFrom $237Free CancellationRating
7.4
8,861 reviews
Search United Airlines flights
DeltaPriceFrom $246Free CancellationRating
8.0
7,982 reviews
Search Delta flights
SouthwestPriceFrom $246Free CancellationRating
8.0
4,266 reviews
Search Southwest flights
  • Southwest Flights From Chicago to Ontario

    Across 6 Southwest flights from Chicago to Ontario this week, the average price was $477, with the best Southwest deals starting from $246 round-trip. 4,266 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, 8,861 ratings). United Airlines flies from Chicago to Ontario around 4 times per week, with deals starting from $237 round-trip and rising to an average price of around $405.


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.


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1 adult
mar. 7/8
mar. 7/15

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