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

As of May 2026, 1 flights take off from Ontario and land in Chicago each day. The most common flight departure time for this route is 11:00PM, with 63% of daily flights taking off in the evening.

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

Denver (DEN) was the most common stop: 40% of momondo users choosing 1-stop flights on this route connected there.

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

Flights connecting via Las Vegas (LAS) have the shortest average one-way travel time: 5h 40m.

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

Las Vegas (LAS) has the shortest average layover time for this route: 0h 45m.

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

Southwest, Delta, and United Airlines are the most popular carriers operating from Ontario to Chicago

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.

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

The number of flights available between Ontario and Chicago is 8 per week as of May 2026. The most frequent departure day is Tue, with 25% of weekly flights leaving on this day.

What airlines fly to Chicago?

American Airlines, United Airlines and Frontier 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 42% of people opting to fly with this airline when traveling to Chicago. Keep in mind that there are 8 different airlines that fly to Chicago on a routine basis, so you have a few additional options to choose from.

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 May 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.

$76 Cheap Flights from Ontario to Chicago in 2026

Q: What is the typical price of a round-trip flight between Ontario and Chicago?

Prices are currently low for flights on this route. Typical prices usually range from $511 to $321. The lowest price recently found on this route was $273.

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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.

1:50 pm - 10:50 pm

ONT

MDW

7h 00m

1 stop

4:05 pm - 8:05 pm

MDW

ONT

6h 00m

1 stop

$273Southwest

Wed, Sep 9 - Sat, Sep 19

12:55 pm - 9:58 pm

ONT

ORD

7h 03m

1 stop

5:28 am - 10:42 am

ORD

ONT

7h 14m

1 stop

$273Delta

Tue, Aug 4 - Sat, Aug 8

12:00 pm - 9:46 pm

ONT

MDW

7h 46m

1 stop

9:30 am - 4:14 pm

MDW

ONT

8h 44m

2 stops

$278Delta

Tue, Sep 22 - Mon, Sep 28

10:00 pm - 1:03 pm

ONT

ORD

13h 03m

2 stops

7:45 am - 12:05 pm

ORD

ONT

6h 20m

1 stop

$278Delta

Tue, Jul 28 - Thu, Aug 6

1:56 pm - 12:59 am

ONT

ORD

9h 03m

1 stop

5:30 pm - 7:57 pm

ORD

ONT

4h 27mnonstop

$279United Airlines

Thu, Aug 13 - Tue, Aug 18

3:34 pm - 5:07 am

ONT

ORD

11h 33m

1 stop

9:48 pm - 10:05 am

ORD

ONT

14h 17m

1 stop

$280Frontier

Wed, Jun 10 - Tue, Jun 16

6:00 am - 8:52 pm

ONT

ORD

12h 52m

1 stop

5:29 pm - 5:52 pm

ORD

ONT

26h 23m

1 stop

$282Frontier

Wed, Aug 12 - Tue, Aug 18

10:59 pm - 12:30 pm

ONT

MDW

11h 31m

2 stops

9:20 am - 4:14 pm

MDW

ONT

8h 54m

2 stops

$283Delta

Tue, Sep 22 - Sat, Sep 26

3:34 pm - 12:23 pm

ONT

RFD

18h 49m

1 stop

1:13 pm - 3:08 pm

RFD

ONT

27h 55m

1 stop

$383Multiple Airlines

Wed, Jun 10 - Sun, Jun 14

3:34 pm - 12:23 pm

ONT

RFD

18h 49m

1 stop

1:13 pm - 3:08 pm

RFD

ONT

27h 55m

1 stop

$389Multiple Airlines

Wed, Jun 10 - Sun, Jun 14

Delta flights from Ontario to Chicago

Our best Delta deals on Ontario to Chicago flight tickets

Delta

Aug 4

ONT12:55 pmOntario

7h 03m

1 stop

ORD9:58 pmChicago O'Hare Intl

Aug 8

ORD5:28 amChicago O'Hare Intl

7h 14m

1 stop

ONT10:42 amOntario

$273

Delta

Sep 22

ONT10:59 pmOntario

9h 25m

2 stops

ORD10:24 amChicago O'Hare Intl

Sep 26

ORD7:00 amChicago O'Hare Intl

7h 29m

1 stop

ONT12:29 pmOntario

$278

Delta

Sep 22

ONT10:59 pmOntario

11h 40m

2 stops

ORD12:39 pmChicago O'Hare Intl

Sep 28

ORD11:30 amChicago O'Hare Intl

12h 26m

2 stops

ONT9:56 pmOntario

$283

Frontier flights from Ontario to Chicago

Our best Frontier deals on Ontario to Chicago flight tickets

Frontier

Jun 10

ONT3:34 pmOntario

11h 33m

1 stop

ORD5:07 amChicago O'Hare Intl

Jun 16

ORD9:48 pmChicago O'Hare Intl

14h 17m

1 stop

ONT10:05 amOntario

$280

Frontier

Aug 12

ONT6:00 amOntario

12h 52m

1 stop

ORD8:52 pmChicago O'Hare Intl

Aug 18

ORD5:29 pmChicago O'Hare Intl

26h 23m

1 stop

ONT5:52 pmOntario

$282

Frontier

Jul 11

ONT10:49 amOntario

8h 03m

1 stop

ORD8:52 pmChicago O'Hare Intl

Jul 15

ORD7:15 amChicago O'Hare Intl

9h 52m

1 stop

ONT3:07 pmOntario

$284

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

Quickest round-trip

OntarioChicago

ONT - MDW

ONTMDW

Ontario

Wed 9/9

1:50 pm-10:50 pm

1 stop7h 00m

Chicago Midway

Sat 9/19

4:05 pm-8:05 pm

1 stop6h 00m

$273

OntarioChicago

ONT - ORD

ONTORD

Ontario

Tue 8/4

12:55 pm-9:58 pm

1 stop7h 03m

Chicago O'Hare Intl

Sat 8/8

5:28 am-10:42 am

1 stop7h 14m

$273

OntarioChicago

ONT - MDW

ONTMDW

Ontario

Tue 9/22

12:00 pm-9:46 pm

1 stop7h 46m

Chicago Midway

Mon 9/28

9:30 am-4:14 pm

2 stops8h 44m

$278

OntarioChicago

ONT - ORD

ONTORD

Ontario

Tue 7/28

10:00 pm-1:03 pm

2 stops13h 03m

Chicago O'Hare Intl

Thu 8/6

7:45 am-12:05 pm

1 stop6h 20m

$278

OntarioChicago

ONT - ORD

ONTORD

Ontario

Thu 8/13

1:56 pm-12:59 am

1 stop9h 03m

Chicago O'Hare Intl

Tue 8/18

5:30 pm-7:57 pm

Nonstop4h 27m

$279

OntarioChicago

ONT - ORD

ONTORD

Ontario

Wed 6/10

3:34 pm-5:07 am

1 stop11h 33m

Chicago O'Hare Intl

Tue 6/16

9:48 pm-10:05 am

1 stop14h 17m

$280

OntarioChicago

ONT - ORD

ONTORD

Ontario

Wed 8/12

6:00 am-8:52 pm

1 stop12h 52m

Chicago O'Hare Intl

Tue 8/18

5:29 pm-5:52 pm

1 stop26h 23m

$282

OntarioChicago

ONT - MDW

ONTMDW

Ontario

Tue 9/22

10:59 pm-12:30 pm

2 stops11h 31m

Chicago Midway

Sat 9/26

9:20 am-4:14 pm

2 stops8h 54m

$283

OntarioChicago

ONT - RFD

ONTRFD

Ontario

Wed 6/10

3:34 pm-12:23 pm

1 stop18h 49m

Chicago Greater Rockford

Sun 6/14

1:13 pm-3:08 pm

1 stop27h 55m

$383

OntarioChicago

ONT - RFD

ONTRFD

Ontario

Wed 6/10

3:34 pm-12:23 pm

1 stop18h 49m

Chicago Greater Rockford

Sun 6/14

1:13 pm-3:08 pm

1 stop27h 55m

$389

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 typical price of a round-trip flight between Ontario and Chicago?

What is the cheapest month to fly to Chicago?

The month of September is, on average, the cheapest month to fly to Chicago from Ontario, with most prices found around $102. If you’re not able to fly to Chicago in September, then April is your next best option. Flight prices from Ontario to Chicago during April average around $108.

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 $378. 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 $445.

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 $305. In contrast, the most expensive time of day to depart to Chicago is at noon when prices are around $486.

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 from Ontario 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 $423 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 $290 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 16% 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 May 2026, prices for Ontario to Chicago flights are approximately 98% 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	$228
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 $228. The best round-trip flight deal from Ontario to Chicago found on momondo in the last 72 hours is $412.

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

Frequently asked questions about flying from Ontario to Chicago

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 May 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 Boeing 737 MAX 8, making up 17.84% of the total bookings. Other popular models include Boeing 737-900 with 14.32%, Airbus A321neo with 10.16%, and Airbus A320-100/200 with 9.24%.
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 41% of the total bookings. Other popular airlines include Southwest with 32%, Frontier with 20%, and Delta with 4%.

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 $117	Free Cancellation	Rating 5.6 2,944 reviews	Search Frontier flights
United Airlines	PriceFrom $226	Free Cancellation	Rating 7.4 9,736 reviews	Search United Airlines flights
Southwest	PriceFrom $258	Free Cancellation	Rating 7.9 4,285 reviews	Search Southwest flights
Delta	PriceFrom $260	Free Cancellation	Rating 7.9 8,454 reviews	Search Delta flights
American Airlines	PriceFrom $316	Free Cancellation	Rating 7.1 11,642 reviews	Search American Airlines flights

Southwest Flights From Ontario to Chicago
Southwest flight deals from Ontario to Chicago start from $258 round-trip. Over the 7 Southwest flights for this route in a normal week, average airfare is usually $428 round-trip - but some users have found much cheaper deals with momondo.
United Airlines Flights From Ontario to Chicago
The best United Airlines deal for Ontario to Chicago flight tickets found on momondo in the last 72 hours was $226, round-trip. It should be noted that an average United Airlines flight deal for this route in this time was higher, at $458 round-trip. United Airlines operates 1 flight out of Ontario into Chicago in an average week, so prices vary by time and availability. 9,736 United Airlines reviews by users on momondo have scored the airline at 7.4/10.

Merrillville

New Buffalo

Hammond

Saint Joseph

Benton Harbor

Portage

Lansing

Valparaiso

Munster

Schererville

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.

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Fly into one of these airports located in Chicago

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Cheap flights from Ontario to Chicago from $76

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 9/1. 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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Delta flights from Ontario to Chicago

Our best Delta deals on Ontario to Chicago flight tickets

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Our best Frontier 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 typical price of a round-trip flight between Ontario and 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 from Ontario 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 day?

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

Frequently asked questions about flying from Ontario to 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

United Airlines Flights From Ontario to Chicago

Traveling to a place near Chicago?

Why use momondo?

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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