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Cheap flights from Chicago to Los Angeles from $63

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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Frontier Logo
7:00 am - 11:09 amORD-ONT
6h 09m1 stop
Frontier Logo
2:59 pm - 11:57 pmONT-ORD
6h 58m1 stop
$129Frontier
Find Deal
Thu, Dec 4 - Mon, Dec 8
Frontier Logo
7:00 am - 2:25 pmORD-ONT
9h 25m1 stop
Frontier Logo
6:30 am - 9:01 pmONT-ORD
12h 31m1 stop
$130Frontier
Find Deal
Mon, Dec 8 - Thu, Jan 8
Frontier Logo
7:51 pm - 11:59 pmORD-ONT
6h 08m1 stop
Frontier Logo
5:57 pm - 9:33 pmONT-ORD
25h 36m1 stop
$134Frontier
Find Deal
Thu, Jan 22 - Sun, Jan 25
Frontier Logo
8:05 am - 5:34 pmMDW-ONT
11h 29m1 stop
Frontier Logo
6:00 am - 8:05 pmONT-MDW
12h 05m1 stop
$134Frontier
Find Deal
Fri, Dec 12 - Thu, Jan 15
Frontier Logo
6:45 pm - 9:06 pmORD-ONT
28h 21m1 stop
Frontier Logo
2:59 pm - 11:42 amONT-ORD
18h 43m1 stop
$137Frontier
Find Deal
Thu, Nov 27 - Thu, Dec 4
Frontier Logo
7:00 am - 2:25 pmORD-ONT
9h 25m1 stop
Frontier Logo
2:59 pm - 11:57 pmONT-ORD
6h 58m1 stop
$138Frontier
Find Deal
Fri, Dec 5 - Mon, Dec 8
Multiple Airlines Logo
7:00 am - 2:25 pmORD-ONT
9h 25m1 stop
Multiple Airlines Logo
6:00 pm - 6:05 amONT-ORD
34h 05m2 stops
$186Multiple Airlines
Find Deal
Mon, Dec 8 - Mon, Jan 5
Delta Logo
1:14 pm - 10:47 pmMDW-ONT
11h 33m2 stops
Delta Logo
5:49 pm - 8:54 amONT-MDW
13h 05m2 stops
$316Delta
Find Deal
Sat, Dec 6 - Mon, Dec 15
Delta Logo
1:14 pm - 10:47 pmMDW-ONT
11h 33m2 stops
Delta Logo
5:49 pm - 8:54 amONT-MDW
13h 05m2 stops
$336Delta
Find Deal
Fri, Dec 12 - Tue, Dec 16
Delta Logo
1:14 pm - 10:47 pmMDW-ONT
11h 33m2 stops
Delta Logo
5:49 pm - 9:19 amONT-MDW
13h 30m2 stops
$366Delta
Find Deal
Wed, Dec 10 - Wed, Dec 17

Frontier flights from Chicago to Ontario

Our best Frontier deals on Chicago to Ontario flight tickets
Frontier
Dec 4
ORD7:00 amChicago O'Hare Intl
6h 09m
1 stop
ONT11:09 amOntario
Dec 8
ONT2:59 pmOntario
6h 58m
1 stop
ORD11:57 pmChicago O'Hare Intl
$129
Find similar
Frontier
Dec 8
ORD7:00 amChicago O'Hare Intl
9h 25m
1 stop
ONT2:25 pmOntario
Jan 8
ONT6:30 amOntario
12h 31m
1 stop
ORD9:01 pmChicago O'Hare Intl
$130
Find similar
Frontier
Jan 22
ORD7:51 pmChicago O'Hare Intl
6h 08m
1 stop
ONT11:59 pmOntario
Jan 25
ONT5:57 pmOntario
25h 36m
1 stop
ORD9:33 pmChicago O'Hare Intl
$134
Find similar

Delta flights from Chicago to Ontario

Our best Delta deals on Chicago to Ontario flight tickets
Delta
Dec 6
MDW1:14 pmChicago Midway
11h 33m
2 stops
ONT10:47 pmOntario
Dec 15
ONT5:49 pmOntario
13h 05m
2 stops
MDW8:54 amChicago Midway
$316
Find similar
Delta
Dec 12
MDW1:14 pmChicago Midway
11h 33m
2 stops
ONT10:47 pmOntario
Dec 16
ONT5:49 pmOntario
13h 05m
2 stops
MDW8:54 amChicago Midway
$336
Find similar
Delta
Dec 10
MDW1:14 pmChicago Midway
11h 33m
2 stops
ONT10:47 pmOntario
Dec 17
ONT5:49 pmOntario
13h 30m
2 stops
MDW9:19 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 10, 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 12/4

7:00 am-11:09 am

1 stop6h 09m

Ontario

Mon 12/8

2:59 pm-11:57 pm

1 stop6h 58m

$129

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Mon 12/8

7:00 am-2:25 pm

1 stop9h 25m

Ontario

Thu 1/8

6:30 am-9:01 pm

1 stop12h 31m

$130

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Thu 1/22

7:51 pm-11:59 pm

1 stop6h 08m

Ontario

Sun 1/25

5:57 pm-9:33 pm

1 stop25h 36m

$134

ChicagoOntario

MDW - ONT

MDWONT

Chicago Midway

Fri 12/12

8:05 am-5:34 pm

1 stop11h 29m

Ontario

Thu 1/15

6:00 am-8:05 pm

1 stop12h 05m

$134

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Thu 11/27

6:45 pm-9:06 pm

1 stop28h 21m

Ontario

Thu 12/4

2:59 pm-11:42 am

1 stop18h 43m

$137

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Fri 12/5

7:00 am-2:25 pm

1 stop9h 25m

Ontario

Mon 12/8

2:59 pm-11:57 pm

1 stop6h 58m

$138

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Mon 12/8

7:00 am-2:25 pm

1 stop9h 25m

Ontario

Mon 1/5

6:00 pm-6:05 am

2 stops34h 05m

$186

ChicagoOntario

MDW - ONT

MDWONT

Chicago Midway

Sat 12/6

1:14 pm-10:47 pm

2 stops11h 33m

Ontario

Mon 12/15

5:49 pm-8:54 am

2 stops13h 05m

$316

ChicagoOntario

MDW - ONT

MDWONT

Chicago Midway

Fri 12/12

1:14 pm-10:47 pm

2 stops11h 33m

Ontario

Tue 12/16

5:49 pm-8:54 am

2 stops13h 05m

$336

ChicagoOntario

MDW - ONT

MDWONT

Chicago Midway

Wed 12/10

1:14 pm-10:47 pm

2 stops11h 33m

Ontario

Wed 12/17

5:49 pm-9:19 am

2 stops13h 30m

$366

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 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 15% 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 $451.
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 5h 55m.

  • 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
3,113 reviews
Search Frontier flights
American AirlinesPriceFrom $231Free CancellationRating
7.2
11,045 reviews
Search American Airlines flights
United AirlinesPriceFrom $237Free CancellationRating
7.4
9,012 reviews
Search United Airlines flights
DeltaPriceFrom $256Free CancellationRating
7.9
8,007 reviews
Search Delta flights
SouthwestPriceFrom $282Free CancellationRating
8.0
4,235 reviews
Search Southwest flights

  • Southwest Flights From Chicago to Ontario

    Across 13 Southwest flights from Chicago to Ontario this week, the average price was $470, with the best Southwest deals starting from $282 round-trip. 4,235 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, 9,012 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 $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

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