What is the cheapest airline that flies from Chicago O'Hare Intl to Ontario?

Frontier and United Airlines are the most popular carriers operating from Chicago O'Hare Intl to Ontario

How many flights depart from Chicago O'Hare Intl Airport to Ontario on average per week?

As of June 2026, 3 flights take off from Chicago O'Hare Intl Airport and land in Ontario each week. The most common flight departure day for this route is Fri, with 33% of weekly flights taking off on this day.

Which airport is the most popular layover for flights between Chicago O'Hare Intl Airport and Ontario?

Phoenix (PHX) was the most common stop: 33% of momondo users choosing 1-stop flights on this route connected there.

Which layover airport has the shortest travel time from Chicago O'Hare Intl Airport to Ontario?

Flights connecting via Phoenix (PHX) have the shortest average one-way travel time: 5h 51m.

What airlines fly to Ontario?

American Airlines, United Airlines and Frontier are the top three most popular airlines that fly to Ontario from Chicago O'Hare Intl Airport according to our data. American Airlines is the first choice among our users, with 43% of people opting to fly with this airline when traveling to Ontario. Keep in mind that there are 7 different airlines that fly to Ontario on a routine basis, so you have a few additional options to choose from.

Which layover airport offers the lowest fares from Chicago O'Hare Intl Airport to Ontario?

Flights via Denver (DEN) offer the lowest average round-trip price of $208.

Which layover airport has the shortest connection time from Chicago O'Hare Intl Airport to Ontario?

Phoenix (PHX) has the shortest average layover time for this route: 0h 53m.

When did momondo last update prices for flights from Chicago O'Hare Intl Airport to Ontario Airport?

Prices for flights from Chicago O'Hare Intl Airport to Ontario Airport refresh daily.

How many operators does momondo search for flights from Chicago O'Hare Intl Airport to Ontario Airport?

As of June 2026, there are 4 operators available to choose from for flights from Chicago O'Hare Intl Airport to Ontario Airport.

How old do you have to be to fly from Chicago O'Hare Intl Airport 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 O'Hare Intl Airport to Ontario Airport.

What documentation or ID do you need to fly to Ontario Airport?

The travel and health documents you'll need for your trip to Ontario Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Ontario Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

$108 Cheap Flights from Chicago O'Hare Intl Airport to Ontario in 2026

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from Chicago O'Hare Intl Airport to Los Angeles

Round-trip

One-way

Last minute

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Cheap round-trip flights

Enter your travel dates to find the best prices.

9:57 pm - 10:04 am

ORD

ONT

14h 07m

1 stop

6:00 am - 8:52 pm

ONT

ORD

12h 52m

1 stop

$218Frontier

Tue, Jul 14 - Tue, Jul 21

2:41 pm - 11:55 pm

ORD

ONT

11h 14m

1 stop

7:56 pm - 1:36 pm

ONT

ORD

15h 40m

1 stop

$220Frontier

Wed, Aug 19 - Tue, Aug 25

9:57 pm - 10:04 am

ORD

ONT

14h 07m

1 stop

10:49 am - 8:52 pm

ONT

ORD

8h 03m

1 stop

$221Frontier

Tue, Aug 11 - Sat, Aug 15

9:57 pm - 10:04 am

ORD

ONT

14h 07m

1 stop

10:49 am - 8:52 pm

ONT

ORD

8h 03m

1 stop

$236Frontier

Wed, Aug 12 - Sat, Aug 15

8:06 pm - 10:35 pm

ORD

ONT

4h 29mnonstop

7:00 am - 1:10 pm

ONT

ORD

4h 10mnonstop

$239United Airlines

Wed, Aug 19 - Tue, Aug 25

7:29 am - 3:14 pm

ORD

ONT

9h 45m

1 stop

1:38 pm - 5:37 am

ONT

ORD

13h 59m

1 stop

$240Frontier

Sat, Aug 8 - Tue, Aug 11

9:10 am - 7:01 pm

ORD

ONT

11h 51m

1 stop

9:37 am - 8:15 pm

ONT

ORD

8h 38m

1 stop

$241Frontier

Wed, Aug 26 - Tue, Sep 1

9:57 pm - 10:04 am

ORD

ONT

14h 07m

1 stop

3:40 pm - 5:37 am

ONT

ORD

11h 57m

1 stop

$242Frontier

Sat, Jul 25 - Sat, Aug 1

9:57 pm - 11:50 pm

ORD

ONT

27h 53m

1 stop

9:32 am - 12:49 am

ONT

ORD

13h 17m

1 stop

$244Frontier

Wed, Jul 22 - Mon, Jul 27

7:15 am - 3:14 pm

ORD

ONT

9h 59m

1 stop

6:00 am - 8:52 pm

ONT

ORD

12h 52m

1 stop

$245Frontier

Sat, Aug 8 - Sat, Aug 15

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United Airlines flights from Chicago O'Hare Intl Airport to Ontario

Our best United Airlines deals on Chicago O'Hare Intl Airport to Ontario flight tickets

United Airlines

Aug 19

ORD8:06 pmChicago O'Hare Intl

4h 29m

ONT10:35 pmOntario

Aug 25

ONT7:00 amOntario

4h 10m

ORD1:10 pmChicago O'Hare Intl

$239

United Airlines

Aug 12

ORD8:06 pmChicago O'Hare Intl

4h 29m

ONT10:35 pmOntario

Aug 15

ONT1:56 pmOntario

9h 03m

1 stop

ORD12:59 amChicago O'Hare Intl

$249

United Airlines

Jul 22

ORD6:10 amChicago O'Hare Intl

8h 02m

1 stop

ONT12:12 pmOntario

Aug 1

ONT1:50 pmOntario

7h 09m

1 stop

ORD10:59 pmChicago O'Hare Intl

$259

Frontier flights from Chicago O'Hare Intl Airport to Ontario

Our best Frontier deals on Chicago O'Hare Intl Airport to Ontario flight tickets

Frontier

Jul 14

ORD9:57 pmChicago O'Hare Intl

14h 07m

1 stop

ONT10:04 amOntario

Jul 21

ONT6:00 amOntario

12h 52m

1 stop

ORD8:52 pmChicago O'Hare Intl

$218

Frontier

Aug 19

ORD2:41 pmChicago O'Hare Intl

11h 14m

1 stop

ONT11:55 pmOntario

Aug 25

ONT7:56 pmOntario

15h 40m

1 stop

ORD1:36 pmChicago O'Hare Intl

$220

Frontier

Aug 11

ORD9:57 pmChicago O'Hare Intl

14h 07m

1 stop

ONT10:04 amOntario

Aug 15

ONT10:49 amOntario

8h 03m

1 stop

ORD8:52 pmChicago O'Hare Intl

$221

momondo Fare Finder

Use the filters below to find and compare flights from Chicago O'Hare Intl Airport to Ontario that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Tue 7/14

9:57 pm-10:04 am

1 stop14h 07m

Ontario

Tue 7/21

6:00 am-8:52 pm

1 stop12h 52m

$218

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Wed 8/19

2:41 pm-11:55 pm

1 stop11h 14m

Ontario

Tue 8/25

7:56 pm-1:36 pm

1 stop15h 40m

$220

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Tue 8/11

9:57 pm-10:04 am

1 stop14h 07m

Ontario

Sat 8/15

10:49 am-8:52 pm

1 stop8h 03m

$221

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Wed 8/12

9:57 pm-10:04 am

1 stop14h 07m

Ontario

Sat 8/15

10:49 am-8:52 pm

1 stop8h 03m

$236

Quickest round-trip

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Wed 8/19

8:06 pm-10:35 pm

Nonstop4h 29m

Ontario

Tue 8/25

7:00 am-1:10 pm

Nonstop4h 10m

$239

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Sat 8/8

7:29 am-3:14 pm

1 stop9h 45m

Ontario

Tue 8/11

1:38 pm-5:37 am

1 stop13h 59m

$240

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Wed 8/26

9:10 am-7:01 pm

1 stop11h 51m

Ontario

Tue 9/1

9:37 am-8:15 pm

1 stop8h 38m

$241

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Sat 7/25

9:57 pm-10:04 am

1 stop14h 07m

Ontario

Sat 8/1

3:40 pm-5:37 am

1 stop11h 57m

$242

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Wed 7/22

9:57 pm-11:50 pm

1 stop27h 53m

Ontario

Mon 7/27

9:32 am-12:49 am

1 stop13h 17m

$244

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Sat 8/8

7:15 am-3:14 pm

1 stop9h 59m

Ontario

Sat 8/15

6:00 am-8:52 pm

1 stop12h 52m

$245

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

How to get the cheapest flight ticket from Chicago O'Hare Intl Airport 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

Prices

Airlines

Layovers

Other information

What is the typical price of a round-trip flight between Chicago O'Hare Intl Airport and Ontario?

What is the cheapest month to fly to Ontario?

In general, February is the cheapest month to fly from Chicago O'Hare Intl Airport to Ontario. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $385. If you aren’t able to travel during the month of February, then book flights to Ontario from Chicago O'Hare Intl Airport during May instead. Flights to Ontario in May, while not as cheap as those in February, still average around $390.

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 Wednesday when prices can be found for as low as $434. 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 O'Hare Intl Airport to Ontario for around $648.

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 O'Hare Intl Airport to Ontario when you can find flight prices for as low as $372. 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 $541 on average. Flights to Ontario from Chicago O'Hare Intl Airport in the morning are generally more expensive because this time of day is more convenient for travelers’ schedules.

What is the cheapest Chicago O'Hare Intl to Ontario flight route?

Fly from Chicago O'Hare Intl to Ontario for the best Chicago O'Hare Intl - Ontario flight prices

What cabin class options are available on Chicago O'Hare Intl Airport to Ontario flights?

There are 4 cabin classes available to choose from on Chicago O'Hare Intl Airport 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 O'Hare Intl Airport to Ontario flights?

You could potentially save up to 8% on your flight if you consider stops on a Chicago O'Hare Intl Airport to Ontario flight.

How have Chicago O'Hare Intl Airport to Ontario flight prices changed over time?

As of June 2026, prices for Chicago O'Hare Intl Airport to Ontario flights are approximately 10% more expensive when compared to flights at the same time last year.

When to book flights from Chicago O'Hare Intl Airport to Ontario

Are you open to changing your travel dates? Check out the ideal times to fly from Chicago O'Hare Intl Airport to Ontario according to our flight data. Find out which month and days have the cheapest flights.

Estimated round-trip price

Cheap Chicago O'Hare Intl Airport to Ontario (ORD to ONT) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Chicago O'Hare Intl Airport to Ontario

Best Price Found	$203
Fastest flight time	4h 29m
Direct flights	Every day
Airports in Ontario	1 airport

The best one-way flight to Ontario from Chicago O'Hare Intl Airport in the past 72 hours is $203. The best round-trip flight deal from Chicago O'Hare Intl Airport to Ontario found on momondo in the last 72 hours is $364.

The fastest flight from Chicago O'Hare Intl Airport to Ontario takes 4h 29m

Direct flights go from Chicago O'Hare Intl Airport to Ontario every day.

There is 1 airport in Ontario. From Chicago O'Hare Intl Airport there are direct flights to Ontario (ONT).

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Frequently asked questions about flying from Chicago O'Hare Intl Airport to Ontario

How far is Chicago O'Hare Intl to Ontario by plane?
A flight from Chicago O'Hare Intl to Ontario will travel around 1697.7 mi. 4h 29m is a normal flight duration for this route.
When did momondo last update prices for flights from Chicago O'Hare Intl Airport to Ontario Airport?
Prices for flights from Chicago O'Hare Intl Airport to Ontario Airport refresh daily.
How many operators does momondo search for flights from Chicago O'Hare Intl Airport to Ontario Airport?
As of June 2026, there are 4 operators available to choose from for flights from Chicago O'Hare Intl Airport to Ontario Airport.
How old do you have to be to fly from Chicago O'Hare Intl Airport 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 O'Hare Intl Airport to Ontario Airport.
What documentation or ID do you need to fly to Ontario Airport?
The travel and health documents you'll need for your trip to Ontario Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Ontario Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.
What is the most popular plane model from Chicago O'Hare Intl Airport to Ontario?
momondo data reveals that the most frequently booked plane model on the route from Chicago O'Hare Intl Airport to Ontario is Boeing 737 MAX 8, representing 17.35% of all bookings. The subsequent popular models are Boeing 737-900 at 17.35%, Airbus A321neo at 10.20%, and Boeing 737-800 at 9.18%.
What is the most popular airline from Chicago O'Hare Intl Airport to Ontario?
momondo data reveals that the most frequently booked airline on the route from Chicago O'Hare Intl Airport to Ontario is United Airlines, representing 44% of all bookings. The subsequent popular airlines are American Airlines at 29%, Frontier at 20%, and Delta at 8%.

Best airlines flying from Chicago O'Hare Intl Airport to Ontario

Compare and see reviews for airlines that fly from Chicago O'Hare Intl Airport to Ontario with momondo

Airline	Rating	Free Cancellation	Price
Frontier	PriceFrom $153	Free Cancellation	Rating 5.6 2,858 reviews	Search Frontier flights
Delta	PriceFrom $248	Free Cancellation	Rating 7.8 8,455 reviews	Search Delta flights
American Airlines	PriceFrom $307	Free Cancellation	Rating 7.1 11,779 reviews	Search American Airlines flights
United Airlines	PriceFrom $329	Free Cancellation	Rating 7.4 9,900 reviews	Search United Airlines flights

United Airlines Flights From Chicago O'Hare Intl Airport to Ontario
United Airlines operates around 3 flights from Chicago O'Hare Intl Airport to Ontario every week. The average price of these flights found in the last 72 hours has been $532, but momondo users have found United Airlines deals from Chicago O'Hare Intl Airport to Ontario from as low as $329 round-trip. United Airlines has been scored 7.4/10 in 9,900 reviews.

Why use momondo?

Why should I use momondo to find a flight deal from Chicago to Ontario?

Finding the right flight to Ontario from Chicago is quick and easy when you have a range of options in front of you, from reputable agents and recognisable airlines. Options that can then be filtered down to find the best fit. That is what momondo does. We make finding flights to Ontario quick and easy, saving you time and money.

Can I find flights from Chicago to Ontario with flexible booking policies on momondo?

Yes. All flights to Ontario from Chicago on momondo can be compared and filtered by various policies on offer, including flexible booking.

How can momondo help me find flights from Chicago to Ontario?

momondo provides multiple filters to help you find the best flight to Ontario from Chicago. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.

I’m not ready to book a flight from Chicago to Ontario right now. Can momondo alert me if prices change?

Yes. momondo can track prices for Chicago to Ontario flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.

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United Airlines flights from Chicago O'Hare Intl Airport to Ontario

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Frontier flights from Chicago O'Hare Intl Airport to Ontario

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How to get the cheapest flight ticket from Chicago O'Hare Intl Airport to Ontario

What is the typical price of a round-trip flight between Chicago O'Hare Intl Airport and Ontario?

What is the cheapest month to fly to Ontario?

What is the cheapest day to depart on your flight to Ontario?

What is the cheapest time of day to depart on your flight to Ontario?

What is the cheapest Chicago O'Hare Intl to Ontario flight route?

What cabin class options are available on Chicago O'Hare Intl Airport to Ontario flights?

Can stopping save me money on Chicago O'Hare Intl Airport to Ontario flights?

How have Chicago O'Hare Intl Airport to Ontario flight prices changed over time?

What is the cheapest airline that flies from Chicago O'Hare Intl to Ontario?

What airlines fly to Ontario?

Which airport is the most popular layover for flights between Chicago O'Hare Intl Airport and Ontario?

Which layover airport offers the lowest fares from Chicago O'Hare Intl Airport to Ontario?

Which layover airport has the shortest travel time from Chicago O'Hare Intl Airport to Ontario?

Which layover airport has the shortest connection time from Chicago O'Hare Intl Airport to Ontario?

How many flights depart from Chicago O'Hare Intl Airport to Ontario on average per week?

When to book flights from Chicago O'Hare Intl Airport to Ontario

Cheap Chicago O'Hare Intl Airport to Ontario (ORD to ONT) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Chicago O'Hare Intl Airport to Ontario

Best Price Found

Fastest flight time

Direct flights

Airports in Ontario

Frequently asked questions about flying from Chicago O'Hare Intl Airport to Ontario

Best airlines flying from Chicago O'Hare Intl Airport to Ontario

Compare and see reviews for airlines that fly from Chicago O'Hare Intl Airport to Ontario with momondo

United Airlines Flights From Chicago O'Hare Intl Airport to Ontario

Why use momondo?

An easier way to manage your Ontario trip

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