Which airport is the most popular layover for flights between Ontario and Chicago?

Denver (DEN) was the most common stop: 71% of momondo users choosing 1-stop flights on this route connected there.

How many flights depart from Ontario to Chicago on average per week?

The number of flights available between Ontario and Chicago is 4 per week as of February 2026. The most frequent departure day is Thu, with 25% of weekly flights leaving on this day.

What airlines fly to Chicago?

American Airlines, United Airlines and Spirit Airlines are the top three most popular airlines that fly to Chicago from Ontario 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 Chicago. Keep in mind that there are 9 different airlines that fly to Chicago on a routine basis, so you have a few additional options to choose from.

What is the cheapest airline that flies from Ontario to Chicago?

Frontier, Alaska Airlines, and United Airlines are the most popular carriers operating from Ontario to Chicago

Which layover airport has the shortest travel time from Ontario to Chicago?

Flights connecting via Salt Lake City (SLC) have the shortest average one-way travel time: 6h 53m.

Which layover airport offers the lowest fares from Ontario to Chicago?

Flights via Las Vegas (LAS) offer the lowest average round-trip price of $144.

Which layover airport has the shortest connection time from Ontario to Chicago?

Salt Lake City (SLC) has the shortest average layover time for this route: 1h 45m.

When did momondo last update prices for flights from Ontario Airport to Chicago?

Prices for flights from Ontario Airport to Chicago were last updated today.

How many operators does momondo search for flights from Ontario Airport to Chicago?

As of February 2026, there are 5 operators available to choose from for flights from Ontario Airport to Chicago.

How old do you have to be to fly from Ontario Airport to Chicago?

Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Ontario Airport to Chicago.

What documentation or ID do you need to fly to Chicago?

The travel and health documents required for your trip to Chicago 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 Chicago. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

$67 Cheap Flights from Ontario to Chicago in 2026

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Find the cheapest flights from Ontario to Chicago

Round-trip

One-way

Last minute

Direct

Cheap round-trip flights

Enter your travel dates to find the best prices.

7:29 pm - 5:50 am

ONT

ORD

8h 21m

1 stop

9:18 pm - 8:04 am

ORD

ONT

12h 46m

1 stop

$189Multiple Airlines

Wed, Apr 15 - Sun, Apr 19

9:02 pm - 6:47 am

ONT

ORD

7h 45m

1 stop

9:18 pm - 8:04 am

ORD

ONT

12h 46m

1 stop

$190Frontier

Mon, Apr 13 - Wed, Apr 15

9:02 pm - 6:20 am

ONT

ORD

7h 18m

1 stop

6:09 pm - 11:55 pm

ORD

ONT

7h 46m

1 stop

$191Frontier

Mon, Apr 13 - Thu, Apr 16

9:02 pm - 6:20 am

ONT

ORD

7h 18m

1 stop

8:58 pm - 10:44 am

ORD

ONT

15h 46m

1 stop

$197Frontier

Mon, Apr 13 - Tue, Apr 21

12:59 am - 8:19 pm

ONT

ORD

17h 20m

2 stops

9:18 pm - 8:04 am

ORD

ONT

12h 46m

1 stop

$198Multiple Airlines

Tue, Apr 14 - Sun, Apr 19

12:59 am - 8:19 pm

ONT

ORD

17h 20m

2 stops

9:18 pm - 8:04 am

ORD

ONT

12h 46m

1 stop

$199Multiple Airlines

Tue, Apr 14 - Sun, Apr 19

10:27 pm - 11:50 am

ONT

ORD

11h 23m

1 stop

9:18 pm - 8:04 am

ORD

ONT

12h 46m

1 stop

$211Frontier

Thu, Apr 9 - Sat, Apr 18

8:20 pm - 5:50 am

ONT

ORD

7h 30m

1 stop

4:21 pm - 7:31 am

ORD

ONT

17h 10m

2 stops

$217Multiple Airlines

Fri, May 1 - Wed, May 6

6:20 am - 2:19 pm

ONT

ORD

5h 59m

1 stop

8:58 pm - 8:24 am

ORD

ONT

13h 26m

1 stop

$218Frontier

Wed, Apr 8 - Wed, Apr 15

9:49 pm - 6:08 am

ONT

ORD

6h 19m

1 stop

2:29 pm - 11:56 pm

ORD

ONT

11h 27m

1 stop

$220Frontier

Mon, Mar 30 - Fri, Apr 10

Frontier flights from Ontario to Chicago

Our best Frontier deals on Ontario to Chicago flight tickets

Frontier

Apr 21

ONT7:29 pmOntario

9h 18m

1 stop

ORD6:47 amChicago O'Hare Intl

Apr 27

ORD7:43 amChicago O'Hare Intl

42h 12m

2 stops

ONT11:55 pmOntario

$170

Frontier

Apr 13

ONT9:02 pmOntario

7h 45m

1 stop

ORD6:47 amChicago O'Hare Intl

Apr 15

ORD9:18 pmChicago O'Hare Intl

12h 46m

1 stop

ONT8:04 amOntario

$190

Frontier

Apr 13

ONT9:02 pmOntario

7h 18m

1 stop

ORD6:20 amChicago O'Hare Intl

Apr 16

ORD6:09 pmChicago O'Hare Intl

7h 46m

1 stop

ONT11:55 pmOntario

$191

Southwest flights from Ontario to Chicago

Our best Southwest deals on Ontario to Chicago flight tickets

Southwest

Apr 8

ONT6:15 amOntario

5h 55m

1 stop

MDW2:10 pmChicago Midway

Apr 14

MDW5:35 pmChicago Midway

5h 55m

1 stop

ONT9:30 pmOntario

$343

Southwest

Apr 18

ONT6:10 amOntario

6h 10m

1 stop

MDW2:20 pmChicago Midway

Apr 28

MDW11:00 amChicago Midway

4h 15m

ONT1:15 pmOntario

$345

Southwest

Apr 9

ONT11:55 pmOntario

3h 45m

MDW5:40 amChicago Midway

Apr 13

MDW11:00 amChicago Midway

4h 15m

ONT1:15 pmOntario

$347

Fly from

Fly to

Route

Depart

Return

Price

OntarioChicago

ONT - ORD

ONTORD

Ontario

Wed 4/15

7:29 pm-5:50 am

1 stop8h 21m

Chicago O'Hare Intl

Sun 4/19

9:18 pm-8:04 am

1 stop12h 46m

$189

OntarioChicago

ONT - ORD

ONTORD

Ontario

Mon 4/13

9:02 pm-6:47 am

1 stop7h 45m

Chicago O'Hare Intl

Wed 4/15

9:18 pm-8:04 am

1 stop12h 46m

$190

OntarioChicago

ONT - ORD

ONTORD

Ontario

Mon 4/13

9:02 pm-6:20 am

1 stop7h 18m

Chicago O'Hare Intl

Thu 4/16

6:09 pm-11:55 pm

1 stop7h 46m

$191

OntarioChicago

ONT - ORD

ONTORD

Ontario

Mon 4/13

9:02 pm-6:20 am

1 stop7h 18m

Chicago O'Hare Intl

Tue 4/21

8:58 pm-10:44 am

1 stop15h 46m

$197

OntarioChicago

ONT - ORD

ONTORD

Ontario

Tue 4/14

12:59 am-8:19 pm

2 stops17h 20m

Chicago O'Hare Intl

Sun 4/19

9:18 pm-8:04 am

1 stop12h 46m

$198

OntarioChicago

ONT - ORD

ONTORD

Ontario

Tue 4/14

12:59 am-8:19 pm

2 stops17h 20m

Chicago O'Hare Intl

Sun 4/19

9:18 pm-8:04 am

1 stop12h 46m

$199

OntarioChicago

ONT - ORD

ONTORD

Ontario

Thu 4/9

10:27 pm-11:50 am

1 stop11h 23m

Chicago O'Hare Intl

Sat 4/18

9:18 pm-8:04 am

1 stop12h 46m

$211

OntarioChicago

ONT - ORD

ONTORD

Ontario

Fri 5/1

8:20 pm-5:50 am

1 stop7h 30m

Chicago O'Hare Intl

Wed 5/6

4:21 pm-7:31 am

2 stops17h 10m

$217

OntarioChicago

ONT - ORD

ONTORD

Ontario

Wed 4/8

6:20 am-2:19 pm

1 stop5h 59m

Chicago O'Hare Intl

Wed 4/15

8:58 pm-8:24 am

1 stop13h 26m

$218

OntarioChicago

ONT - ORD

ONTORD

Ontario

Mon 3/30

9:49 pm-6:08 am

1 stop6h 19m

Chicago O'Hare Intl

Fri 4/10

2:29 pm-11:56 pm

1 stop11h 27m

$220

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 Ontario to Chicago

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 cheapest month to fly to Chicago?

The month of January is, on average, the cheapest month to fly to Chicago from Ontario, with most prices found around $307. If you’re not able to fly to Chicago in January, then June is your next best option. Flight prices from Ontario to Chicago during June average around $317.

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

The cheapest day to depart on your flight to Chicago is on a Thursday when prices can be found for as low as $357. This is often the case because there is less demand to fly during this day of the week. When flying out on a Sunday, the most expensive travel day of the week, you can expect to see flight prices from Ontario to Chicago for around $432.

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

Our most recent data shows that the best time of day to fly to Chicago is in the afternoon. Flights from Ontario to Chicago during this time can be as low as $276. In contrast, the most expensive time of day to depart to Chicago is at noon when prices are around $451.

What is the cheapest Ontario to Chicago flight route?

Fly from Ontario to Chicago Midway for the best Ontario - Chicago flight prices

How far in advance should I book a flight to Chicago?

You are more likely to see cheaper flights to Chicago from Ontario when booking weeks ahead of your departure date. In general, you can expect to find flights to Chicago for around $386 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Chicago from Ontario for as low as $291 on momondo.

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

There are 4 cabin classes available to choose from on Ontario to Chicago 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 Ontario to Chicago flights?

You could potentially save up to 5% on your flight if you consider stops on a Ontario to Chicago flight.

How have Ontario to Chicago flight prices changed over time?

As of February 2026, prices for Ontario to Chicago flights are approximately 60% more expensive when compared to flights at the same time last year.

When to book flights from Ontario to Chicago

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

Estimated round-trip price

Cheap Ontario to Chicago (ONT to CHI) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Ontario to Chicago

Best Price Found	$148
Fastest flight time	3h 45m
Direct flights	Every day
Airports in Chicago	3 airports

The best one-way flight to Chicago from Ontario in the past 72 hours is $148. The best round-trip flight deal from Ontario to Chicago found on momondo in the last 72 hours is $357.

The fastest flight from Ontario to Chicago takes 3h 45m

Direct flights go from Ontario to Chicago every day.

There are 3 airports in Chicago. From Ontario there are direct flights to Chicago O'Hare Intl (ORD), Chicago Midway (MDW).

Search flight deals

How far is Ontario to Chicago by plane?
The straight-line distance from Ontario to Chicago is 1710.7 mi. 3h 45m is a normal flight duration for this route.
When did momondo last update prices for flights from Ontario Airport to Chicago?
Prices for flights from Ontario Airport to Chicago were last updated today.
How many operators does momondo search for flights from Ontario Airport to Chicago?
As of February 2026, there are 5 operators available to choose from for flights from Ontario Airport to Chicago.
How old do you have to be to fly from Ontario Airport to Chicago?
Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Ontario Airport to Chicago.
What documentation or ID do you need to fly to Chicago?
The travel and health documents required for your trip to Chicago 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 Chicago. 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 Ontario to Chicago?
Based on momondo bookings for flights between Ontario and Chicago, the leading plane model is Airbus A321neo, making up 18.72% of the total bookings. Other popular models include Boeing 737 MAX 8 with 12.29%, Boeing 737-800 Passenger/BBJ2 (winglets) with 6.98%, and Airbus A321-100/200 with 6.98%.
What is the most popular airline from Ontario to Chicago?
Based on momondo bookings for flights between Ontario and Chicago, the leading airline is United Airlines, making up 39% of the total bookings. Other popular airlines include Southwest with 34%, Frontier with 18%, and American Airlines with 5%.

Best airlines flying from Ontario to Chicago

Compare and see reviews for airlines that fly from Ontario to Chicago with momondo

Airline	Rating	Free Cancellation	Price
Frontier	PriceFrom $98	Free Cancellation	Rating 5.7 3,046 reviews	Search Frontier flights
United Airlines	PriceFrom $226	Free Cancellation	Rating 7.4 9,335 reviews	Search United Airlines flights
Southwest	PriceFrom $237	Free Cancellation	Rating 8.0 4,298 reviews	Search Southwest flights
American Airlines	PriceFrom $246	Free Cancellation	Rating 7.2 11,334 reviews	Search American Airlines flights
Delta	PriceFrom $256	Free Cancellation	Rating 7.9 8,228 reviews	Search Delta flights

Southwest Flights From Ontario to Chicago
Southwest flight deals from Ontario to Chicago start from $237 round-trip. Over the 4 Southwest flights for this route in a normal week, average airfare is usually $390 round-trip - but some users have found much cheaper deals with momondo.

Merrillville

New Buffalo

Hammond

Benton Harbor

Saint Joseph

Portage

Lansing

Valparaiso

Schererville

Munster

Crown Point

Chesterton

Monticello

Porter

Griffith

Saint John

Why use momondo?

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

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from Ontario to Chicago. momondo saves you time and could save you money on your trip.

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

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

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

Once you have performed a search for Ontario to Chicago flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.

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

Of course. momondo tracks the price of Ontario to Chicago flights. All you need is a valid email address and we will do the rest; it is that quick and easy.

An easier way to manage your Chicago trip

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Cheap flights from Ontario to Chicago from $67

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Ontario to Chicago departing on 4/14. 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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Frontier flights from Ontario to Chicago

Our best Frontier deals on Ontario to Chicago flight tickets

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Our best Southwest deals on Ontario to Chicago flight tickets

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See travel insights to Chicago from

How to get the cheapest flight ticket from Ontario to Chicago

What is the cheapest month to fly to Chicago?

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

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

What is the cheapest Ontario to Chicago flight route?

How far in advance should I book a flight to Chicago?

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

Can stopping save me money on Ontario to Chicago flights?

How have Ontario to Chicago flight prices changed over time?

What is the cheapest airline that flies from Ontario to Chicago?

What airlines fly to Chicago?

Which airport is the most popular layover for flights between Ontario and Chicago?

Which layover airport offers the lowest fares from Ontario to Chicago?

Which layover airport has the shortest travel time from Ontario to Chicago?

Which layover airport has the shortest connection time from Ontario to Chicago?

How many flights depart from Ontario to Chicago on average per week?

When to book flights from Ontario to Chicago

Cheap Ontario to Chicago (ONT to CHI) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Ontario to Chicago

Best Price Found

Fastest flight time

Direct flights

Airports in Chicago

Best airlines flying from Ontario to Chicago

Compare and see reviews for airlines that fly from Ontario to Chicago with momondo

Southwest Flights From Ontario to Chicago

Traveling to a place near Chicago?

Why use momondo?

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

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

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

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

An easier way to manage your Chicago 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.

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

Find better results for your trip to the United States

Fly into one of these airports located in Chicago

Airports listed have a maximum distance of 78.5 mi from Chicago

Fly your favorite airline to Chicago

Airlines are sorted and displayed according to clicks in the past 7 days on momondo

Cabin classes currently available on flights to Chicago

List of cabin classes available on flights landing in Chicago. Availability may vary depending on flight origin and airline.

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Popular flights according to clicks in the last 7 days on momondo

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