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Cheap flights from Chicago to Los Angeles from $61

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 1/19. 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

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Frontier Logo
10:37 pm - 2:26 pmORD-ONT
17h 49m1 stop
Frontier Logo
6:10 am - 9:24 pmONT-ORD
13h 14m1 stop
$134Frontier
Find Deal
Fri, Jan 9 - Fri, Jan 16
Frontier Logo
7:00 am - 6:01 pmMDW-ONT
13h 01m1 stop
Frontier Logo
5:57 pm - 1:04 pmONT-MDW
17h 07m2 stops
$180Frontier
Find Deal
Fri, Feb 20 - Sun, Feb 22
Frontier Logo
10:32 pm - 7:36 amORD-ONT
11h 04m1 stop
Frontier Logo
6:00 am - 6:45 pmONT-ORD
10h 45m1 stop
$182Frontier
Find Deal
Thu, Jan 8 - Mon, Jan 12
Frontier Logo
7:00 am - 11:59 pmORD-ONT
18h 59m1 stop
Frontier Logo
6:45 am - 12:12 amONT-ORD
15h 27m1 stop
$183Frontier
Find Deal
Mon, Dec 22 - Fri, Dec 26
Frontier Logo
3:05 pm - 11:56 pmMDW-ONT
10h 51m1 stop
Frontier Logo
6:10 am - 7:54 pmONT-MDW
11h 44m1 stop
$184Frontier
Find Deal
Fri, Jan 9 - Fri, Jan 16
Frontier Logo
7:00 am - 6:01 pmMDW-ONT
13h 01m1 stop
Frontier Logo
6:56 pm - 1:04 pmONT-MDW
16h 08m1 stop
$188Frontier
Find Deal
Fri, Feb 20 - Sun, Feb 22
Multiple Airlines Logo
9:53 pm - 11:48 pmORD-ONT
27h 55m2 stops
Multiple Airlines Logo
12:30 pm - 1:58 pmONT-ORD
23h 28m1 stop
$189Multiple Airlines
Find Deal
Thu, Dec 11 - Tue, Dec 16
Multiple Airlines Logo
8:36 am - 9:17 pmORD-ONT
38h 41m2 stops
Multiple Airlines Logo
12:30 pm - 1:58 pmONT-ORD
23h 28m1 stop
$191Multiple Airlines
Find Deal
Mon, Dec 8 - Tue, Dec 16
Frontier Logo
9:53 pm - 11:48 pmORD-ONT
27h 55m2 stops
Frontier Logo
6:45 am - 12:12 amONT-ORD
15h 27m1 stop
$193Frontier
Find Deal
Thu, Dec 11 - Thu, Dec 18
Multiple Airlines Logo
8:36 am - 9:17 pmORD-ONT
38h 41m2 stops
Multiple Airlines Logo
12:30 pm - 1:58 pmONT-ORD
23h 28m1 stop
$195Multiple Airlines
Find Deal
Mon, Dec 8 - Tue, Dec 16

Frontier flights from Chicago to Ontario

Our best Frontier deals on Chicago to Ontario flight tickets
Frontier
Jan 9
ORD10:37 pmChicago O'Hare Intl
17h 49m
1 stop
ONT2:26 pmOntario
Jan 16
ONT6:10 amOntario
13h 14m
1 stop
ORD9:24 pmChicago O'Hare Intl
$134
Find similar
Frontier
Jan 8
ORD6:15 amChicago O'Hare Intl
27h 21m
2 stops
ONT7:36 amOntario
Jan 12
ONT6:00 amOntario
10h 45m
1 stop
ORD6:45 pmChicago O'Hare Intl
$168
Find similar
Frontier
Jan 8
ORD10:32 pmChicago O'Hare Intl
11h 04m
1 stop
ONT7:36 amOntario
Jan 12
ONT6:00 amOntario
10h 45m
1 stop
ORD6:45 pmChicago O'Hare Intl
$174
Find similar

Delta flights from Chicago to Ontario

Our best Delta deals on Chicago to Ontario flight tickets
Delta
Jan 27
MDW12:48 pmChicago Midway
10h 17m
1 stop
ONT9:05 pmOntario
Jan 29
ONT10:30 pmOntario
12h 39m
2 stops
MDW1:09 pmChicago Midway
$345
Find similar
Delta
Jan 27
MDW1:29 pmChicago Midway
12h 29m
2 stops
ONT11:58 pmOntario
Jan 29
ONT6:00 amOntario
9h 55m
2 stops
MDW5:55 pmChicago Midway
$350
Find similar
Delta
Jan 9
MDW1:28 pmChicago Midway
9h 37m
2 stops
ONT9:05 pmOntario
Jan 16
ONT10:30 pmOntario
10h 02m
1 stop
MDW10:32 amChicago Midway
$366
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 November 26, 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

Fri 1/9

10:37 pm-2:26 pm

1 stop17h 49m

Ontario

Fri 1/16

6:10 am-9:24 pm

1 stop13h 14m

$134

ChicagoOntario

MDW - ONT

MDWONT

Chicago Midway

Fri 2/20

7:00 am-6:01 pm

1 stop13h 01m

Ontario

Sun 2/22

5:57 pm-1:04 pm

2 stops17h 07m

$180

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Thu 1/8

10:32 pm-7:36 am

1 stop11h 04m

Ontario

Mon 1/12

6:00 am-6:45 pm

1 stop10h 45m

$182

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Mon 12/22

7:00 am-11:59 pm

1 stop18h 59m

Ontario

Fri 12/26

6:45 am-12:12 am

1 stop15h 27m

$183

ChicagoOntario

MDW - ONT

MDWONT

Chicago Midway

Fri 1/9

3:05 pm-11:56 pm

1 stop10h 51m

Ontario

Fri 1/16

6:10 am-7:54 pm

1 stop11h 44m

$184

ChicagoOntario

MDW - ONT

MDWONT

Chicago Midway

Fri 2/20

7:00 am-6:01 pm

1 stop13h 01m

Ontario

Sun 2/22

6:56 pm-1:04 pm

1 stop16h 08m

$188

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Thu 12/11

9:53 pm-11:48 pm

2 stops27h 55m

Ontario

Tue 12/16

12:30 pm-1:58 pm

1 stop23h 28m

$189

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Mon 12/8

8:36 am-9:17 pm

2 stops38h 41m

Ontario

Tue 12/16

12:30 pm-1:58 pm

1 stop23h 28m

$191

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Thu 12/11

9:53 pm-11:48 pm

2 stops27h 55m

Ontario

Thu 12/18

6:45 am-12:12 am

1 stop15h 27m

$193

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Mon 12/8

8:36 am-9:17 pm

2 stops38h 41m

Ontario

Tue 12/16

12:30 pm-1:58 pm

1 stop23h 28m

$195

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 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, 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 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 Saturday, the most expensive travel day of the week, you can expect to see flight prices from Chicago to Ontario for around $487.

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 $383. 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 $495 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.

Can stopping save me money on Chicago to Ontario flights?

No. A direct flight is the cheapest option for a flight between Chicago to Ontario.

How have Chicago to Ontario flight prices changed over time?

As of November 2025, prices for Chicago to Ontario flights are approximately 22% 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

$170

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 $170. 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 6h 39m.

  • 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
3,099 reviews
Search Frontier flights
American AirlinesPriceFrom $231Free CancellationRating
7.2
11,038 reviews
Search American Airlines flights
United AirlinesPriceFrom $237Free CancellationRating
7.4
9,046 reviews
Search United Airlines flights
SouthwestPriceFrom $246Free CancellationRating
8.0
4,254 reviews
Search Southwest flights
DeltaPriceFrom $256Free CancellationRating
7.9
7,999 reviews
Search Delta flights

  • Southwest Flights From Chicago to Ontario

    Across 9 Southwest flights from Chicago to Ontario this week, the average price was $440, with the best Southwest deals starting from $246 round-trip. 4,254 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, 9,046 ratings). United Airlines flies from Chicago to Ontario around 5 times per week, with deals starting from $237 round-trip and rising to an average price of around $434.

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

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.
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