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

Air Canada, American Airlines, and United Airlines are the most popular carriers operating from Ontario to Chicago O'Hare Intl

How long does it take to fly to Chicago O'Hare Intl Airport?

Flight times vary depending on what airport in Region of Ontario you fly out of and what airport in Chicago O'Hare Intl Airport you fly into. For example, flying from Ottawa to Chicago O'Hare Intl Airport takes 2h 08m on average. On the other hand, flying from Toronto to Chicago O'Hare Intl Airport takes 5h 08m on average. Keep in mind that it’s always quicker to opt for a non-stop flight, so be sure to check momondo to see if there are any available for your route.

Which airlines fly to Chicago O'Hare Intl Airport?

Air Canada, United Airlines and American Airlines are the top three most popular airlines that fly to Chicago O'Hare Intl Airport from Region of Ontario according to our data. Air Canada is the first choice among our users, with 63% of people opting to fly with this airline when travelling to Chicago O'Hare Intl Airport. Keep in mind that there are 5 different airlines that fly to Chicago O'Hare Intl Airport on a routine basis, so you have a few additional options to choose from.

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

Prices for flights from Ontario to Chicago O'Hare Intl Airport are refreshed on a daily basis.

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

There are 5 operators available for flights from Ontario to Chicago O'Hare Intl Airport as of January 2026.

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

What documentation or ID do you need to fly to Chicago O'Hare Intl Airport?

The travel and health documents you'll need for your trip to Chicago O'Hare Intl 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 Chicago O'Hare Intl Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

C$ 147 Cheap Flights from Region of Ontario to Chicago O'Hare Intl Airport in 2026

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

As of January 2026, 552 flights take off from Region of Ontario and land in Chicago O'Hare Intl Airport each week. The most common flight departure day for this route is Thu, with 16% of weekly flights taking off on this day.

Q: How many flights depart from Region of Ontario to Chicago O'Hare Intl Airport on average per day?

As of January 2026, there are 78 flights per day flying from Region of Ontario to Chicago O'Hare Intl Airport. The most common time of day flights depart is 6:00a.m., with 44% of flights taking off in the afternoon.

1 adult

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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.

9:25 a.m. - 11:18 a.m.

YUL

ORD

2h 53mdirect

12:50 p.m. - 4:05 p.m.

ORD

YUL

2h 15mdirect

C$ 246Air Canada

Thu, 26 Mar - Mon, 30 Mar

6:25 p.m. - 8:10 p.m.

YUL

ORD

2h 45mdirect

7:15 a.m. - 10:20 a.m.

ORD

YUL

2h 05mdirect

C$ 249Air Canada

Thu, 19 Feb - Sat, 21 Feb

4:45 p.m. - 6:45 p.m.

YUL

ORD

3h 00mdirect

8:50 a.m. - 3:16 p.m.

ORD

YUL

5h 26m

1 stop

C$ 250United Airlines

Thu, 19 Feb - Sat, 21 Feb

7:00 a.m. - 8:00 a.m.

YYZ

ORD

2h 00mdirect

9:15 p.m. - 11:59 p.m.

ORD

YYZ

1h 44mdirect

C$ 256United Airlines

Fri, 19 Jun - Sun, 21 Jun

8:45 a.m. - 9:50 a.m.

YYZ

ORD

2h 05mdirect

6:28 p.m. - 9:21 p.m.

ORD

YYZ

1h 53mdirect

C$ 260Lufthansa

Thu, 19 Feb - Mon, 23 Feb

8:45 a.m. - 9:50 a.m.

YYZ

ORD

2h 05mdirect

6:28 p.m. - 9:21 p.m.

ORD

YYZ

1h 53mdirect

C$ 262Lufthansa

Thu, 19 Feb - Mon, 23 Feb

3:40 p.m. - 12:40 a.m.

YOW

ORD

10h 00m

2 stops

8:16 p.m. - 5:25 p.m.

ORD

YOW

20h 09m

1 stop

C$ 375Multiple Airlines

Tue, 24 Feb - Tue, 3 Mar

3:55 p.m. - 12:40 a.m.

YOW

ORD

9h 45m

1 stop

8:16 p.m. - 5:25 p.m.

ORD

YOW

20h 09m

1 stop

C$ 376Multiple Airlines

Tue, 24 Feb - Tue, 3 Mar

8:40 p.m. - 4:40 p.m.

YKF

ORD

21h 00m

1 stop

5:30 p.m. - 7:50 p.m.

ORD

YKF

25h 20m

1 stop

C$ 431WestJet

Thu, 4 Jun - Mon, 8 Jun

8:10 p.m. - 1:35 p.m.

YXU

ORD

18h 25m

1 stop

2:20 p.m. - 6:35 a.m.

ORD

YXU

15h 15m

1 stop

C$ 714WestJet

Thu, 26 Mar - Mon, 30 Mar

Delta flights from Region of Ontario to Chicago O'Hare Intl Airport

Our best Delta deals on Region of Ontario to Chicago O'Hare Intl Airport flight tickets

Delta

19 Feb

YUL6:00 a.m.Montreal Pierre Elliott Trudeau Intl

8h 20m

1 stop

ORD1:20 p.m.Chicago O'Hare Intl

23 Feb

ORD2:05 p.m.Chicago O'Hare Intl

8h 05m

1 stop

YUL11:10 p.m.Montreal Pierre Elliott Trudeau Intl

C$ 296

Delta

13 Mar

YUL4:45 p.m.Montreal Pierre Elliott Trudeau Intl

4h 32m

1 stop

ORD8:17 p.m.Chicago O'Hare Intl

17 Mar

ORD9:35 a.m.Chicago O'Hare Intl

8h 00m

1 stop

YUL6:35 p.m.Montreal Pierre Elliott Trudeau Intl

C$ 297

Delta

24 Apr

YUL6:45 p.m.Montreal Pierre Elliott Trudeau Intl

6h 14m

1 stop

ORD11:59 p.m.Chicago O'Hare Intl

27 Apr

ORD7:14 a.m.Chicago O'Hare Intl

9h 21m

1 stop

YUL5:35 p.m.Montreal Pierre Elliott Trudeau Intl

C$ 304

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

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

United Airlines

19 Feb

YUL4:45 p.m.Montreal Pierre Elliott Trudeau Intl

3h 00m

ORD6:45 p.m.Chicago O'Hare Intl

21 Feb

ORD8:50 a.m.Chicago O'Hare Intl

5h 26m

1 stop

YUL3:16 p.m.Montreal Pierre Elliott Trudeau Intl

C$ 250

United Airlines

19 Feb

YYZ9:00 p.m.Toronto Pearson Intl

2h 04m

ORD10:04 p.m.Chicago O'Hare Intl

23 Feb

ORD9:15 p.m.Chicago O'Hare Intl

1h 44m

YYZ11:59 p.m.Toronto Pearson Intl

C$ 256

United Airlines

6 Mar

YYZ9:00 p.m.Toronto Pearson Intl

2h 04m

ORD10:04 p.m.Chicago O'Hare Intl

8 Mar

ORD6:25 p.m.Chicago O'Hare Intl

1h 53m

YYZ9:18 p.m.Toronto Pearson Intl

C$ 258

momondo Fare Finder

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

Fly from

Fly to

Route

Depart

Return

Price

MontrealChicago

YUL - ORD

YULORD

Montreal Pierre Elliott Trudeau Intl

Thu 26/3

9:25 a.m.-11:18 a.m.

Nonstop2h 53m

Chicago O'Hare Intl

Mon 30/3

12:50 p.m.-4:05 p.m.

Nonstop2h 15m

C$ 246

MontrealChicago

YUL - ORD

YULORD

Montreal Pierre Elliott Trudeau Intl

Thu 19/2

6:25 p.m.-8:10 p.m.

Nonstop2h 45m

Chicago O'Hare Intl

Sat 21/2

7:15 a.m.-10:20 a.m.

Nonstop2h 05m

C$ 249

MontrealChicago

YUL - ORD

YULORD

Montreal Pierre Elliott Trudeau Intl

Thu 19/2

4:45 p.m.-6:45 p.m.

Nonstop3h 00m

Chicago O'Hare Intl

Sat 21/2

8:50 a.m.-3:16 p.m.

1 stop5h 26m

C$ 250

TorontoChicago

YYZ - ORD

YYZORD

Toronto Pearson Intl

Fri 19/6

7:00 a.m.-8:00 a.m.

Nonstop2h 00m

Chicago O'Hare Intl

Sun 21/6

9:15 p.m.-11:59 p.m.

Nonstop1h 44m

C$ 256

TorontoChicago

YYZ - ORD

YYZORD

Toronto Pearson Intl

Thu 19/2

8:45 a.m.-9:50 a.m.

Nonstop2h 05m

Chicago O'Hare Intl

Mon 23/2

6:28 p.m.-9:21 p.m.

Nonstop1h 53m

C$ 260

TorontoChicago

YYZ - ORD

YYZORD

Toronto Pearson Intl

Thu 19/2

8:45 a.m.-9:50 a.m.

Nonstop2h 05m

Chicago O'Hare Intl

Mon 23/2

6:28 p.m.-9:21 p.m.

Nonstop1h 53m

C$ 262

OttawaChicago

YOW - ORD

YOWORD

Ottawa

Tue 24/2

3:40 p.m.-12:40 a.m.

2 stops10h 00m

Chicago O'Hare Intl

Tue 3/3

8:16 p.m.-5:25 p.m.

1 stop20h 09m

C$ 375

OttawaChicago

YOW - ORD

YOWORD

Ottawa

Tue 24/2

3:55 p.m.-12:40 a.m.

1 stop9h 45m

Chicago O'Hare Intl

Tue 3/3

8:16 p.m.-5:25 p.m.

1 stop20h 09m

C$ 376

TorontoChicago

YKF - ORD

YKFORD

Toronto Region of Waterloo Intl

Thu 4/6

8:40 p.m.-4:40 p.m.

1 stop21h 00m

Chicago O'Hare Intl

Mon 8/6

5:30 p.m.-7:50 p.m.

1 stop25h 20m

C$ 431

LondonChicago

YXU - ORD

YXUORD

London

Thu 26/3

8:10 p.m.-1:35 p.m.

1 stop18h 25m

Chicago O'Hare Intl

Mon 30/3

2:20 p.m.-6:35 a.m.

1 stop15h 15m

C$ 714

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 Region of Ontario to Chicago O'Hare Intl Airport

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

Other information

What is the cheapest month to fly to Chicago O'Hare Intl Airport?

In general, November is the cheapest month to fly from Region of Ontario to Chicago O'Hare Intl Airport. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around C$ 292. The month of May is another great option to travel to Chicago O'Hare Intl Airport, with average flight prices from Region of Ontario averaging around C$ 356.

What is the cheapest day to depart on your flight to Chicago O'Hare Intl Airport?

The cheapest day to depart on your flight to Chicago O'Hare Intl Airport is on a Friday when prices can be found for as low as C$ 658. This is often the case because there is less demand to fly during this day of the week. When flying out on a Tuesday, the most expensive travel day of the week, you can expect to see flight prices from Region of Ontario to Chicago O'Hare Intl Airport for around C$ 1,038.

What is the cheapest time of day to depart on your flight to Chicago O'Hare Intl Airport?

In the evening is the cheapest time of day to fly from Region of Ontario to Chicago O'Hare Intl Airport when you can find flight prices for as low as C$ 633. Flying to Chicago O'Hare Intl Airport 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 at noon when prices are C$ 1,111 on average. Flights to Chicago O'Hare Intl Airport from Region of Ontario at noon are generally more expensive because this time of day is more convenient for travellers’ schedules.

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

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

How far in advance should I book a flight to Chicago O'Hare Intl Airport?

You are more likely to see cheaper flights to Chicago O'Hare Intl Airport from Region of Ontario when booking weeks ahead of your departure date. In general, you can expect to find flights to Chicago O'Hare Intl Airport for around C$ 387 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Chicago O'Hare Intl Airport from Region of Ontario for as low as C$ 264 on momondo.

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

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

You could potentially save up to 20% on your flight if you consider stops on a Region of Ontario to Chicago O'Hare Intl Airport flight.

Cheap Region of Ontario to Chicago O'Hare Intl Airport flight deals and tips

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

Best price found	C$ 280
Fastest flight time	1h 55m
Direct flights	Every day

The best one-way flight to Chicago O'Hare Intl Airport from Region of Ontario in the past 72 hours is C$ 280. The best round-trip flight deal from Region of Ontario to Chicago O'Hare Intl Airport found on momondo in the last 72 hours is C$ 508.

The fastest flight from Region of Ontario to Chicago O'Hare Intl Airport takes 1h 55m

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

Search flight deals

When did momondo last update prices for flights from Ontario to Chicago O'Hare Intl Airport?
Prices for flights from Ontario to Chicago O'Hare Intl Airport are refreshed on a daily basis.
How many operators does momondo search for flights from Ontario to Chicago O'Hare Intl Airport?
There are 5 operators available for flights from Ontario to Chicago O'Hare Intl Airport as of January 2026.
How old do you have to be to fly from Ontario to Chicago O'Hare Intl 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 Ontario to Chicago O'Hare Intl Airport.
What documentation or ID do you need to fly to Chicago O'Hare Intl Airport?
The travel and health documents you'll need for your trip to Chicago O'Hare Intl 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 Chicago O'Hare Intl 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 Region of Ontario to Chicago O'Hare Intl Airport?
Based on momondo bookings for flights between Region of Ontario and Chicago O'Hare Intl Airport, the leading plane model is Embraer 195 E2, making up 12.42% of the total bookings. Other popular models include Embraer 175 (Enhanced Winglets) with 12.33%, De Havilland (Bombardier) DHC-8-400 Dash 8Q with 11.71%, and Embraer 170 with 8.55%.

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

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

Airline	Rating	Free Cancellation	Price
Porter Airlines	PriceFrom C$ 218	Free Cancellation	Rating 7.9 412 reviews	Search Porter Airlines flights
American Airlines	PriceFrom C$ 219	Free Cancellation	Rating 7.2 11,209 reviews	Search American Airlines flights
Air Canada	PriceFrom C$ 242	Free Cancellation	Rating 7.1 10,667 reviews	Search Air Canada flights
United Airlines	PriceFrom C$ 255	Free Cancellation	Rating 7.4 9,215 reviews	Search United Airlines flights
WestJet	PriceFrom C$ 361	Free Cancellation	Rating 7.2 3,252 reviews	Search WestJet flights

Schaumburg

Rosemont

Hoffman Estates

Northbrook

Tinley Park

Munster

Skokie

Great Lakes

Hammond

Harvey

Naperville

Wheeling

Glenview

Des Plaines

Elmhurst

Harvard

Merrillville

Elk Grove Village

Oak Brook

Kenosha

Why use momondo?

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

We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from Ontario to Chicago for you.

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

Flights from Ontario to Chicago with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.

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

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to Chicago from Ontario.

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

If you are not ready to book a flight from Ontario to Chicago now, use our insights above to find helpful tips or alternatively set up a price alert, where momondo will track prices on flights to Chicago and let you know when they change.

An easier way to manage your Chicago O'Hare Intl Airport trip

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Cheap flights from Ontario to Chicago from C$ 147

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 19/2. 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, great deals

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Find the cheapest flights from Ontario to Chicago

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Delta flights from Region of Ontario to Chicago O'Hare Intl Airport

Our best Delta deals on Region of Ontario to Chicago O'Hare Intl Airport flight tickets

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

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

momondo Fare Finder

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

See travel insights to Chicago from

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

What is the cheapest month to fly to Chicago O'Hare Intl Airport?

What is the cheapest day to depart on your flight to Chicago O'Hare Intl Airport?

What is the cheapest time of day to depart on your flight to Chicago O'Hare Intl Airport?

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

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

How far in advance should I book a flight to Chicago O'Hare Intl Airport?

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

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

You could potentially save up to 20% on your flight if you consider stops on a Region of Ontario to Chicago O'Hare Intl Airport flight.

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

Air Canada, American Airlines, and United Airlines are the most popular carriers operating from Ontario to Chicago O'Hare Intl

Which airlines fly to Chicago O'Hare Intl Airport?

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

As of January 2026, there are 78 flights per day flying from Region of Ontario to Chicago O'Hare Intl Airport. The most common time of day flights depart is 6:00a.m., with 44% of flights taking off in the afternoon.

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

As of January 2026, 552 flights take off from Region of Ontario and land in Chicago O'Hare Intl Airport each week. The most common flight departure day for this route is Thu, with 16% of weekly flights taking off on this day.

How long does it take to fly to Chicago O'Hare Intl Airport?

Cheap Region of Ontario to Chicago O'Hare Intl Airport flight deals and tips

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

Best price found

Fastest flight time

Direct flights

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

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

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

What documentation or ID do you need to fly to Chicago O'Hare Intl Airport?

What is the most popular plane model from Region of Ontario to Chicago O'Hare Intl Airport?

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

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

Travelling 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 O'Hare Intl Airport 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 Chicago

Popular Cities in the United States

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