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Cheap flights from Chicago to Los Angeles from $74

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 10/9. 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 to Los Angeles (CHI-ONT)

Cheap round-trip flights

Frontier Logo
8:25 am - 7:54 pmORD-ONT
13h 29m1 stop
Frontier Logo
8:59 pm - 9:28 pmONT-ORD
22h 29m1 stop
$148Frontier
Find Deal
Sat, Sep 6 - Mon, Sep 8
Frontier Logo
8:25 am - 7:23 amORD-ONT
24h 58m1 stop
Frontier Logo
8:59 pm - 9:37 amONT-ORD
10h 38m1 stop
$149Frontier
Find Deal
Sat, Sep 6 - Sat, Sep 13
Frontier Logo
6:24 pm - 9:35 amMDW-ONT
17h 11m1 stop
Frontier Logo
6:53 am - 12:36 amONT-MDW
15h 43m1 stop
$150Frontier
Find Deal
Thu, Oct 16 - Sun, Oct 19
Frontier Logo
10:13 am - 3:29 pmMDW-ONT
7h 16m1 stop
Frontier Logo
8:59 pm - 3:53 pmONT-MDW
16h 54m1 stop
$154Frontier
Find Deal
Thu, Sep 18 - Sun, Sep 21
Frontier Logo
4:44 pm - 11:50 pmORD-ONT
9h 06m1 stop
Frontier Logo
12:32 pm - 12:44 amONT-ORD
10h 12m1 stop
$155Frontier
Find Deal
Thu, Oct 9 - Mon, Oct 13
Frontier Logo
10:13 am - 3:39 pmMDW-ONT
7h 26m1 stop
Frontier Logo
8:59 pm - 3:53 pmONT-MDW
16h 54m1 stop
$155Frontier
Find Deal
Thu, Oct 2 - Sun, Oct 5
Frontier Logo
6:00 am - 7:53 amORD-ONT
27h 53m1 stop
Frontier Logo
12:28 pm - 10:45 pmONT-ORD
8h 17m1 stop
$156Frontier
Find Deal
Sun, Sep 14 - Sun, Sep 21
Frontier Logo
6:30 am - 6:35 pmMDW-ONT
14h 05m1 stop
Frontier Logo
8:59 pm - 3:53 pmONT-MDW
16h 54m1 stop
$156Frontier
Find Deal
Sun, Sep 7 - Sun, Sep 14
Frontier Logo
6:30 am - 6:35 pmMDW-ONT
14h 05m1 stop
Frontier Logo
8:59 pm - 3:53 pmONT-MDW
16h 54m1 stop
$157Frontier
Find Deal
Sun, Sep 14 - Sun, Sep 14
Logo
11:15 am - 9:56 pmORD-ONT
12h 41m1 stop
Logo
1:37 pm - 11:15 pmONT-ORD
31h 38m2 stops
$221
Find Deal
Tue, Sep 9 - Sat, Sep 13

Frontier flights from Chicago to Ontario

Our best Frontier deals on Chicago to Ontario flight tickets
Frontier
Sep 6
ORD8:25 amChicago O'Hare Intl
13h 29m
1 stop
ONT7:54 pmOntario
Sep 8
ONT8:59 pmOntario
22h 29m
1 stop
ORD9:28 pmChicago O'Hare Intl
$148
Find similar
Frontier
Sep 6
ORD8:25 amChicago O'Hare Intl
24h 58m
1 stop
ONT7:23 amOntario
Sep 13
ONT8:59 pmOntario
10h 38m
1 stop
ORD9:37 amChicago O'Hare Intl
$149
Find similar
Frontier
Oct 16
MDW6:24 pmChicago Midway
17h 11m
1 stop
ONT9:35 amOntario
Oct 19
ONT6:53 amOntario
15h 43m
1 stop
MDW12:36 amChicago Midway
$150
Find similar

Southwest flights from Chicago to Ontario

Our best Southwest deals on Chicago to Ontario flight tickets
Southwest
Aug 30
MDW8:25 amChicago Midway
4h 10m
ONT10:35 amOntario
Sep 3
ONT11:55 amOntario
3h 50m
MDW5:45 pmChicago Midway
$559
Find similar
Southwest
Aug 30
MDW8:25 amChicago Midway
4h 10m
ONT10:35 amOntario
Sep 3
ONT10:20 amOntario
6h 55m
1 stop
MDW7:15 pmChicago Midway
$569
Find similar
Southwest
Aug 30
MDW8:25 amChicago Midway
4h 10m
ONT10:35 amOntario
Sep 3
ONT6:45 amOntario
8h 00m
2 stops
MDW4:45 pmChicago Midway
$574
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 August 18, 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

Sat 9/6

8:25 am-7:54 pm

1 stop13h 29m

Ontario

Mon 9/8

8:59 pm-9:28 pm

1 stop22h 29m

$148

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Sat 9/6

8:25 am-7:23 am

1 stop24h 58m

Ontario

Sat 9/13

8:59 pm-9:37 am

1 stop10h 38m

$149

ChicagoOntario

MDW - ONT

MDWONT

Chicago Midway

Thu 10/16

6:24 pm-9:35 am

1 stop17h 11m

Ontario

Sun 10/19

6:53 am-12:36 am

1 stop15h 43m

$150

ChicagoOntario

MDW - ONT

MDWONT

Chicago Midway

Thu 9/18

10:13 am-3:29 pm

1 stop7h 16m

Ontario

Sun 9/21

8:59 pm-3:53 pm

1 stop16h 54m

$154

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Thu 10/9

4:44 pm-11:50 pm

1 stop9h 06m

Ontario

Mon 10/13

12:32 pm-12:44 am

1 stop10h 12m

$155

ChicagoOntario

MDW - ONT

MDWONT

Chicago Midway

Thu 10/2

10:13 am-3:39 pm

1 stop7h 26m

Ontario

Sun 10/5

8:59 pm-3:53 pm

1 stop16h 54m

$155

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Sun 9/14

6:00 am-7:53 am

1 stop27h 53m

Ontario

Sun 9/21

12:28 pm-10:45 pm

1 stop8h 17m

$156

ChicagoOntario

MDW - ONT

MDWONT

Chicago Midway

Sun 9/7

6:30 am-6:35 pm

1 stop14h 05m

Ontario

Sun 9/14

8:59 pm-3:53 pm

1 stop16h 54m

$156

ChicagoOntario

MDW - ONT

MDWONT

Chicago Midway

Sun 9/14

6:30 am-6:35 pm

1 stop14h 05m

Ontario

Sun 9/14

8:59 pm-3:53 pm

1 stop16h 54m

$157

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Tue 9/9

11:15 am-9:56 pm

1 stop12h 41m

Ontario

Sat 9/13

1:37 pm-11:15 pm

2 stops31h 38m

$221

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, 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 $245.

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 $346. 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 $444 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 $321 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 $273 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 15% 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 August 2025, prices for Chicago to Ontario flights are approximately 82% more expensive 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

$74

Fastest flight time

5h 51m

Direct flights

Every day

Airports in Ontario

1 airport
The best one-way flight to Ontario from Chicago in the past 72 hours is $74. The best round-trip flight deal from Chicago to Ontario found on momondo in the last 72 hours is $148.
The fastest flight from Chicago to Ontario takes 5h 51m
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 6h 06m.

  • 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 $121Free CancellationRating
5.8
3,212 reviews
Search Frontier flights
American AirlinesPriceFrom $231Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
DeltaPriceFrom $246Free CancellationRating
8.0
7,981 reviews
Search Delta flights
United AirlinesPriceFrom $246Free CancellationRating
7.4
8,925 reviews
Search United Airlines flights
SouthwestPriceFrom $246Free CancellationRating
8.0
4,246 reviews
Search Southwest flights

  • Southwest Flights From Chicago to Ontario

    Across 6 Southwest flights from Chicago to Ontario this week, the average price was $475, with the best Southwest deals starting from $246 round-trip. 4,246 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, 8,925 ratings). United Airlines flies from Chicago to Ontario around 1 time per week, with deals starting from $246 round-trip and rising to an average price of around $433.

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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