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.

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

As of August 2025, 1 flights take off from Ontario and land in Chicago each day. The most common flight departure time for this route is 6:00AM, with 91% of daily flights taking off at noon.

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

Phoenix (PHX) has the shortest average layover time for this route: 0h 43m.

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

Flights connecting via Phoenix (PHX) have the shortest average one-way travel time: 5h 32m.

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

The number of flights available between Ontario and Chicago is 9 per week as of August 2025. The most frequent departure day is Wed, with 22% 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.

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

Flights via Salt Lake City (SLC) offer the lowest average round-trip price of $256.

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

Frontier is the most popular carrier operating from Ontario to Chicago

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 August 2025, 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.

$73 Cheap Flights from Ontario to Chicago (ONT-CHI) in 2025

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Find the cheapest flights from Ontario to Chicago (ONT-CHI)

Round-trip

One-way

Last minute

Direct

Cheap round-trip flights

11:53 am - 12:24 amONT-MDW

10h 31m1 stop

10:30 am - 5:49 pmMDW-ONT

9h 19m1 stop

$206Frontier

Find Deal

vie., oct. 10 - dom., oct. 12

12:59 am - 12:24 amONT-MDW

21h 25m1 stop

10:13 am - 3:29 pmMDW-ONT

7h 16m1 stop

$208Frontier

Find Deal

dom., ago. 31 - jue., sep. 4

11:53 am - 12:36 amONT-MDW

10h 43m1 stop

9:00 am - 4:28 pmMDW-ONT

9h 28m1 stop

$209Frontier

Find Deal

dom., oct. 12 - vie., oct. 17

12:13 pm - 8:52 pmONT-MDW

6h 39m1 stop

6:30 am - 6:35 pmMDW-ONT

14h 05m1 stop

$210Frontier

Find Deal

vie., sep. 19 - dom., sep. 21

8:59 pm - 9:37 amONT-ORD

10h 38m1 stop

5:10 am - 8:56 pmORD-ONT

41h 46m2 stops

$210Frontier

Find Deal

mié., sep. 10 - dom., sep. 14

12:28 pm - 10:45 pmONT-ORD

8h 17m1 stop

6:44 pm - 8:26 amORD-ONT

15h 42m2 stops

$211Frontier

Find Deal

jue., sep. 25 - mié., oct. 1

12:13 pm - 11:58 pmONT-ORD

9h 45m1 stop

7:15 am - 9:55 pmORD-ONT

16h 40m2 stops

$212Frontier

Find Deal

vie., oct. 3 - jue., oct. 9

11:53 am - 12:24 amONT-MDW

10h 31m1 stop

10:30 am - 5:49 pmMDW-ONT

9h 19m1 stop

$213Frontier

Find Deal

vie., oct. 10 - dom., oct. 12

8:00 am - 6:51 pmONT-ORD

8h 51m1 stop

1:26 pm - 11:50 pmORD-ONT

36h 24m2 stops

$224

Find Deal

mié., sep. 10 - mar., oct. 7

9:16 am - 7:47 pmONT-RFD

8h 31m1 stop

8:37 pm - 7:17 amRFD-ONT

12h 40m1 stop

$225

Find Deal

jue., sep. 25 - dom., sep. 28

Frontier flights from Ontario to Chicago

Our best Frontier deals on Ontario to Chicago flight tickets

Frontier

Oct 10

ONT11:53 amOntario

10h 31m

1 stop

MDW12:24 amChicago Midway

Oct 12

MDW10:30 amChicago Midway

9h 19m

1 stop

ONT5:49 pmOntario

$206

Find similar

Frontier

Aug 31

ONT12:59 amOntario

21h 25m

1 stop

MDW12:24 amChicago Midway

Sep 4

MDW10:13 amChicago Midway

7h 16m

1 stop

ONT3:29 pmOntario

$208

Find similar

Frontier

Oct 12

ONT11:53 amOntario

10h 43m

1 stop

MDW12:36 amChicago Midway

Oct 17

MDW9:00 amChicago Midway

9h 28m

1 stop

ONT4:28 pmOntario

$209

Find similar

Southwest flights from Ontario to Chicago

Our best Southwest deals on Ontario to Chicago flight tickets

Southwest

Sep 4

ONT6:40 amOntario

3h 55m

MDW12:35 pmChicago Midway

Sep 10

MDW6:10 amChicago Midway

6h 00m

1 stop

ONT10:10 amOntario

$489

Find similar

Southwest

Sep 4

ONT6:20 amOntario

6h 15m

1 stop

MDW2:35 pmChicago Midway

Sep 10

MDW6:10 amChicago Midway

6h 00m

1 stop

ONT10:10 amOntario

$499

Find similar

Southwest

Sep 4

ONT5:50 amOntario

8h 20m

2 stops

MDW4:10 pmChicago Midway

Sep 10

MDW12:30 pmChicago Midway

7h 00m

1 stop

ONT5:30 pmOntario

$504

Find similar

Fly from

Fly to

Route

Depart

Return

Price

OntarioChicago

ONT - MDW

ONTMDW

Ontario

vie. 10/10

11:53 am-12:24 am

1 stop10h 31m

Chicago Midway

dom. 10/12

10:30 am-5:49 pm

1 stop9h 19m

$206

OntarioChicago

ONT - MDW

ONTMDW

Ontario

dom. 8/31

12:59 am-12:24 am

1 stop21h 25m

Chicago Midway

jue. 9/4

10:13 am-3:29 pm

1 stop7h 16m

$208

OntarioChicago

ONT - MDW

ONTMDW

Ontario

dom. 10/12

11:53 am-12:36 am

1 stop10h 43m

Chicago Midway

vie. 10/17

9:00 am-4:28 pm

1 stop9h 28m

$209

OntarioChicago

ONT - MDW

ONTMDW

Ontario

vie. 9/19

12:13 pm-8:52 pm

1 stop6h 39m

Chicago Midway

dom. 9/21

6:30 am-6:35 pm

1 stop14h 05m

$210

OntarioChicago

ONT - ORD

ONTORD

Ontario

mié. 9/10

8:59 pm-9:37 am

1 stop10h 38m

Chicago O'Hare Intl

dom. 9/14

5:10 am-8:56 pm

2 stops41h 46m

$210

OntarioChicago

ONT - ORD

ONTORD

Ontario

jue. 9/25

12:28 pm-10:45 pm

1 stop8h 17m

Chicago O'Hare Intl

mié. 10/1

6:44 pm-8:26 am

2 stops15h 42m

$211

OntarioChicago

ONT - ORD

ONTORD

Ontario

vie. 10/3

12:13 pm-11:58 pm

1 stop9h 45m

Chicago O'Hare Intl

jue. 10/9

7:15 am-9:55 pm

2 stops16h 40m

$212

OntarioChicago

ONT - MDW

ONTMDW

Ontario

vie. 10/10

11:53 am-12:24 am

1 stop10h 31m

Chicago Midway

dom. 10/12

10:30 am-5:49 pm

1 stop9h 19m

$213

OntarioChicago

ONT - ORD

ONTORD

Ontario

mié. 9/10

8:00 am-6:51 pm

1 stop8h 51m

Chicago O'Hare Intl

mar. 10/7

1:26 pm-11:50 pm

2 stops36h 24m

$224

OntarioChicago

ONT - RFD

ONTRFD

Ontario

jue. 9/25

9:16 am-7:47 pm

1 stop8h 31m

Chicago Greater Rockford

dom. 9/28

8:37 pm-7:17 am

1 stop12h 40m

$225

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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 November is, on average, the cheapest month to fly to Chicago from Ontario, with most prices found around $225. If you’re not able to fly to Chicago in November, then September is your next best option. Flight prices from Ontario to Chicago during September average around $265.

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 Wednesday when prices can be found for as low as $361. 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 $460.

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 $283. In contrast, the most expensive time of day to depart to Chicago is at noon when prices are around $445.

What is the cheapest Ontario to Chicago flight route?

Fly from Ontario to Chicago O'Hare Intl 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 $366 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 $235 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?

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

How have Ontario to Chicago flight prices changed over time?

As of August 2025, prices for Ontario to Chicago flights are approximately 11% 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	$182
Fastest flight time	3h 45m
Direct flights	Every day
Airports in Chicago	2 airports

The best one-way flight to Chicago from Ontario in the past 72 hours is $182. The best round-trip flight deal from Ontario to Chicago found on momondo in the last 72 hours is $300.

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

Direct flights go from Ontario to Chicago every day.

There are 2 airports near Chicago: 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. 6h 16m 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 August 2025, 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 737-800, making up 16.87% of the total bookings. Other popular models include Airbus A321neo with 13.07%, Boeing 737 MAX 8 with 8.72%, and Airbus A320neo with 8.38%.
What is the most popular airline from Ontario to Chicago?
Based on momondo bookings for flights between Ontario and Chicago, the leading airline is Southwest, making up 32% of the total bookings. Other popular airlines include United Airlines with 25%, Frontier with 25%, and American Airlines with 10%.

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 $108	Free Cancellation	Rating 5.8 3,207 reviews	Search Frontier flights
United Airlines	PriceFrom $227	Free Cancellation	Rating 7.4 8,930 reviews	Search United Airlines flights
Southwest	PriceFrom $237	Free Cancellation	Rating 8.0 4,245 reviews	Search Southwest flights
Delta	PriceFrom $241	Free Cancellation	Rating 7.9 7,981 reviews	Search Delta flights
American Airlines	PriceFrom $246	Free Cancellation	Rating 7.2 10,000 reviews	Search American Airlines flights

Southwest Flights From Ontario to Chicago
Southwest flight deals from Ontario to Chicago start from $237 round-trip. Over the 5 Southwest flights for this route in a normal week, average airfare is usually $442 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 $227, round-trip. It should be noted that an average United Airlines flight deal for this route in this time was higher, at $378 round-trip. United Airlines operates 4 flights out of Ontario into Chicago in an average week, so prices vary by time and availability. 8,930 United Airlines reviews by users on momondo have scored the airline at 7.4/10.

Merrillville

New Buffalo

Hammond

Benton Harbor

Saint Joseph

Lansing

Portage

Schererville

Valparaiso

Crown Point

Munster

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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Chicago Midway Airport

Chicago O'Hare Intl Airport

Chicago Greater Rockford Airport

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Cheap flights from Ontario to Chicago from $73

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 10/8. 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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Big names and deals

Filter for what you want

Filter for what you want

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Find the cheapest flights from Ontario to Chicago (ONT-CHI)

Cheap round-trip flights

Cheap one-way flights

Cheap last minute flights

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Frontier flights from Ontario to Chicago

Our best Frontier deals on Ontario to Chicago flight tickets

Southwest flights from Ontario to Chicago

Our best Southwest deals on Ontario to Chicago flight tickets

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Use the filters below to find and compare flights from Ontario to Chicago that are best for you.

See travel insights to Chicago from

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

What is the cheapest month to fly to Chicago?

The month of November is, on average, the cheapest month to fly to Chicago from Ontario, with most prices found around $225. If you’re not able to fly to Chicago in November, then September is your next best option. Flight prices from Ontario to Chicago during September average around $265.

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?

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 $283. In contrast, the most expensive time of day to depart to Chicago is at noon when prices are around $445.

What is the cheapest Ontario to Chicago flight route?

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

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

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?

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

How have Ontario to Chicago flight prices changed over time?

As of August 2025, prices for Ontario to Chicago flights are approximately 11% more expensive when compared to flights at the same time last year.

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

Frontier is the most popular carrier operating from Ontario to Chicago

What airlines fly to Chicago?

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 offers the lowest fares from Ontario to Chicago?

Flights via Salt Lake City (SLC) offer the lowest average round-trip price of $256.

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

Flights connecting via Phoenix (PHX) have the shortest average one-way travel time: 5h 32m.

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

Phoenix (PHX) has the shortest average layover time for this route: 0h 43m.

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

As of August 2025, 1 flights take off from Ontario and land in Chicago each day. The most common flight departure time for this route is 6:00AM, with 91% of daily flights taking off at noon.

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

The number of flights available between Ontario and Chicago is 9 per week as of August 2025. The most frequent departure day is Wed, with 22% of weekly flights leaving on this day.

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

How far is Ontario to Chicago by plane?

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

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

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

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

What is the most popular plane model from Ontario to Chicago?

What is the most popular airline 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?

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