HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Ontario

$70+ Cheap flights from Chicago (CHI) to Ontario

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 10/4. Fares are subject to change and may not be available on all flights or dates of travel.
CHI — YYZ
ago 26 — set 21
ter 8/26
ter 9/2
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Chicago to Ontario with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheap flight deals from Chicago to Ontario

Keep the following information in mind while searching for Chicago to Ontario flight deals. Data was last updated agosto 21, 2025.

Round-trip from

$167
(United Airlines)

One-way from

$70
(Mytrip)

Popular in

November

Cheapest in

July

Average price

$274

Good round-trip deal

$172 or less

Good one-way deal

$91 or less
From Chicago (CHI) to Ontario
Search Deals
One-way flight from Chicago (CHI) to Ontario
Search Deals
Highest demand for flights based on searches. 8% potential increase in price ($24 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($5 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in August 2025
Search Deals
Price to beat on a round-trip flight from Chicago (CHI) to Ontario.
Search Deals
Price to beat on a one-way flight from Chicago (CHI) to Ontario.
Search Deals

Find flight deals from Chicago to Ontario

Cheapest flights from Chicago to Ontario
Explore the most affordable flight options available from Chicago to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on agosto 21, 2025.

This United Airlines deal was found by Cheapflights users on 8/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sex 11/79:20 pmORD - YYZ
Nonstop1h 39mUnited Airlines
dom 11/99:00 pmYYZ - ORD
Nonstop2h 05mUnited Airlines
Deal found 8/21$167
This Gotogate deal was found by Cheapflights users on 8/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sex 10/243:50 pmORD - YYZ
Nonstop1h 43mAir Canada
seg 10/272:15 pmYYZ - ORD
Nonstop1h 55mAir Canada
Deal found 8/19$168
This Flightnetwork deal was found by Cheapflights users on 8/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Flightnetwork is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
qui 10/29:55 amORD - YYZ
Nonstop1h 43mAir Canada
dom 10/58:20 amYYZ - ORD
Nonstop1h 54mAir Canada
Deal found 8/19$169
This United Airlines deal was found by Cheapflights users on 8/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sex 11/72:00 pmORD - YYZ
1 stop8h 46mUnited Airlines
seg 11/106:52 amYYZ - ORD
Nonstop2h 06mUnited Airlines
Deal found 8/21$177
This Gotogate deal was found by Cheapflights users on 8/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
qui 10/29:35 amMDW - YTZ
Nonstop1h 42mPorter Airlines
dom 10/57:50 amYTZ - MDW
Nonstop1h 49mPorter Airlines
Deal found 8/20$182
This Gotogate deal was found by Cheapflights users on 8/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sex 10/249:35 amMDW - YTZ
Nonstop1h 42mPorter Airlines
seg 10/279:15 amYTZ - MDW
Nonstop1h 50mPorter Airlines
Deal found 8/19$190
This Mytrip deal was found by Cheapflights users on 8/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
ter 9/165:20 pmMDW - YTZ
Nonstop1h 42mPorter Airlines
ter 9/233:35 pmYTZ - MDW
Nonstop1h 49mPorter Airlines
Deal found 8/19$191
This Kiwi.com deal was found by Cheapflights users on 8/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
qui 9/189:35 amMDW - YTZ
Nonstop1h 42mPorter Airlines
dom 9/217:50 amYTZ - MDW
Nonstop1h 49mPorter Airlines
Deal found 8/19$195
This United Airlines deal was found by Cheapflights users on 8/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
ter 11/410:38 amORD - YUL
Nonstop2h 22mUnited Airlines
sáb 11/83:00 pmYUL - ORD
1 stop6h 07mUnited Airlines
Deal found 8/19$196
This Kiwi.com deal was found by Cheapflights users on 8/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
qui 9/49:35 amMDW - YTZ
Nonstop1h 42mPorter Airlines
ter 9/93:35 pmYTZ - MDW
Nonstop1h 49mPorter Airlines
Deal found 8/19$199
This Trip.com deal was found by Cheapflights users on 8/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb 9/206:00 pmORD - YUL
Nonstop2h 29mUnited Airlines
seg 9/226:00 amYUL - ORD
1 stop5h 35mUnited Airlines
Deal found 8/20$200
This United Airlines deal was found by Cheapflights users on 8/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
seg 9/297:11 amORD - YUL
Nonstop2h 29mUnited Airlines
dom 10/59:45 amYUL - ORD
Nonstop2h 38mUnited Airlines
Deal found 8/19$203

Cheapflights Fare Finder

 
Customize your flight search to find flights from Chicago to Ontario that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated agosto 21, 2025.
Use the filters below to find and compare flights from Chicago to Ontario that are best for you.

Fly from

Chicago

Fly to

Ontario

Route

Depart

Return

Price

ChicagoToronto

ORD - YYZ

ORDYYZ

Chicago O'Hare Intl

sáb 11/15

9:20 pm-11:59 pm

Nonstop1h 39m

Toronto Pearson Intl

seg 11/17

5:30 pm-6:39 pm

Nonstop2h 09m

$167

ChicagoToronto

ORD - YYZ

ORDYYZ

Chicago O'Hare Intl

sáb 11/15

3:55 pm-6:34 pm

Nonstop1h 39m

Toronto Pearson Intl

dom 11/16

4:30 pm-5:28 pm

Nonstop1h 58m

$167

ChicagoToronto

ORD - YYZ

ORDYYZ

Chicago O'Hare Intl

sex 11/7

9:20 pm-11:59 pm

Nonstop1h 39m

Toronto Pearson Intl

dom 11/9

9:00 pm-10:05 pm

Nonstop2h 05m

$167

ChicagoToronto

ORD - YYZ

ORDYYZ

Chicago O'Hare Intl

dom 11/2

1:19 pm-4:02 pm

Nonstop1h 43m

Toronto Pearson Intl

qui 11/20

7:40 pm-11:43 pm

1 stop5h 03m

$167

ChicagoToronto

ORD - YYZ

ORDYYZ

Chicago O'Hare Intl

qui 10/2

8:25 pm-11:08 pm

Nonstop1h 43m

Toronto Pearson Intl

dom 10/5

8:20 am-9:14 am

Nonstop1h 54m

$171

ChicagoToronto

ORD - YYZ

ORDYYZ

Chicago O'Hare Intl

dom 10/5

9:55 am-12:38 pm

Nonstop1h 43m

Toronto Pearson Intl

dom 10/12

8:20 am-9:14 am

Nonstop1h 54m

$172

ChicagoToronto

ORD - YYZ

ORDYYZ

Chicago O'Hare Intl

sáb 10/4

9:55 am-12:38 pm

Nonstop1h 43m

Toronto Pearson Intl

sáb 10/11

2:10 pm-3:04 pm

Nonstop1h 54m

$172

ChicagoToronto

ORD - YYZ

ORDYYZ

Chicago O'Hare Intl

qua 11/19

7:15 am-1:43 pm

1 stop5h 28m

Toronto Pearson Intl

dom 11/23

6:52 am-7:57 am

Nonstop2h 05m

$177

ChicagoToronto

MDW - YTZ

MDWYTZ

Chicago Midway

qui 10/2

9:35 am-12:17 pm

Nonstop1h 42m

Toronto Island

dom 10/5

7:50 am-8:39 am

Nonstop1h 49m

$182

ChicagoToronto

MDW - YTZ

MDWYTZ

Chicago Midway

sex 10/24

9:35 am-12:17 pm

Nonstop1h 42m

Toronto Island

seg 10/27

9:15 am-10:05 am

Nonstop1h 50m

$190

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/20

Showing 1-10 of 60 results
1
2
3
...
6

Best time to book a flight from Chicago to Ontario

Have a flexible travel schedule? Discover the best time to fly to Ontario from Chicago with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Chicago to Ontario

What is the cheapest month to book a flight from Chicago to Region of Ontario?

Currently, January is the cheapest month in which you can book a flight from Chicago to Region of Ontario (average of $243). Flying from Chicago to Region of Ontario in August is currently the most expensive (average of $348). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from CHI to ON?

Find hourly flight availability from Chicago to Ontario. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated agosto 21, 2025.

When flying from Chicago to Region of Ontario, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

Weekly flight availability from Chicago to Region of Ontario

Explore weekly flight availability from Chicago to Ontario. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated agosto 21, 2025.

The most flights from CHI to CAON are scheduled on a Wednesday (62 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (49 on average).

Reviews of airlines servicing Ontario

Get insights into the airlines that provide service to Ontario. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Ontario. Reviews last updated agosto 21, 2025.
See what other customers who have flown with Porter Airlines, Air Transat, and United Airlines from Chicago to Ontario have to say. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Porter Airlines
7.9
Good
341 reviews

Entertainment

7.0

Comfort

8.0

Food

7.6

Boarding

8.2

Crew

8.6

Overall

7.9

Reviews

1 / 20
8.0
Excellent

Anonymous,Jul 2025

LIS - YYZ

Everything was on time and easy. Crew were nice on flights and helpful. International flight, so long and typically uncomfortable but not more than most. Food and drink service were below average but you get what you pay for. Overall, good experience
Porter Airlines
7.9
Good
341 reviews
Porter Airlines
7.9
Good
341 reviews

Entertainment

7.0

Comfort

8.0

Food

7.6

Boarding

8.2

Crew

8.6

Overall

7.9

Reviews

1 / 20
8.0
Excellent

Anonymous,Jul 2025

LIS - YYZ

Everything was on time and easy. Crew were nice on flights and helpful. International flight, so long and typically uncomfortable but not more than most. Food and drink service were below average but you get what you pay for. Overall, good experience
Air Transat
7.7
Good
429 reviews
Porter Airlines
7.9
Good
341 reviews

Entertainment

7.0

Comfort

8.0

Food

7.6

Boarding

8.2

Crew

8.6

Overall

7.9

Reviews

1 / 20
8.0
Excellent

Anonymous,Jul 2025

LIS - YYZ

Everything was on time and easy. Crew were nice on flights and helpful. International flight, so long and typically uncomfortable but not more than most. Food and drink service were below average but you get what you pay for. Overall, good experience
United Airlines
7.4
Good
8,930 reviews
Porter Airlines
7.9
Good
341 reviews

Entertainment

7.0

Comfort

8.0

Food

7.6

Boarding

8.2

Crew

8.6

Overall

7.9

Reviews

1 / 20
8.0
Excellent

Anonymous,Jul 2025

LIS - YYZ

Everything was on time and easy. Crew were nice on flights and helpful. International flight, so long and typically uncomfortable but not more than most. Food and drink service were below average but you get what you pay for. Overall, good experience
American Airlines
7.2
Good
10,000 reviews
Porter Airlines
7.9
Good
341 reviews

Entertainment

7.0

Comfort

8.0

Food

7.6

Boarding

8.2

Crew

8.6

Overall

7.9

Reviews

1 / 20
8.0
Excellent

Anonymous,Jul 2025

LIS - YYZ

Everything was on time and easy. Crew were nice on flights and helpful. International flight, so long and typically uncomfortable but not more than most. Food and drink service were below average but you get what you pay for. Overall, good experience
Air Canada
7.1
Good
10,000 reviews
Porter Airlines
7.9
Good
341 reviews

Entertainment

7.0

Comfort

8.0

Food

7.6

Boarding

8.2

Crew

8.6

Overall

7.9

Reviews

1 / 20
8.0
Excellent

Anonymous,Jul 2025

LIS - YYZ

Everything was on time and easy. Crew were nice on flights and helpful. International flight, so long and typically uncomfortable but not more than most. Food and drink service were below average but you get what you pay for. Overall, good experience

Related info for your journey

Find useful and relevant information for your journey from Chicago to Ontario. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from Chicago to Region of Ontario?

    A quick flight from Chicago to Region of Ontario can take about 1h 39m. United Airlines provides one of the quickest options available for as low as $167. Airlines will cover a distance of 436 mi. Generally, flights for this route are nonstop.

  • What are the cheapest airlines to fly from Chicago to Region of Ontario one-way?

    To fly one-way, consider booking your trip with Air Canada, which is currently one of the cheapest options available, starting at $70. Porter Airlines flights start at $72 while deals on United Airlines start at $75 one-way.

  • What are the most popular routes from Chicago to Region of Ontario?

    Most travelers choose Chicago O'Hare Intl - Toronto Pearson Intl, Chicago O'Hare Intl - Montreal Pierre Elliott Trudeau Intl or Chicago Midway - Toronto Island when deciding on the best route from Chicago to Region of Ontario.

  • What are the most reliable airlines from Chicago to Region of Ontario?

    Consider SkyWest Airlines (86%), Japan Airlines (82%) or Envoy Air (80%) when booking your flight. These represent the most reliable airlines when flying from Chicago to Region of Ontario.

  • What are the cheapest flights from Chicago to Region of Ontario?

    Looking at all options, your cheapest flight can be booked for $69. While the most popular route (Chicago O'Hare Intl - Toronto Pearson Intl) can be booked for $156 on average our data indicates $907 when flying from Chicago to Region of Ontario.

  • Can I find deals for flights from Chicago to Ontario that include hotel bookings?

    Yes. In addition to deals on Chicago to Ontario flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Chicago to Ontario?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Chicago to Ontario.

  • Can I find deals for business class flights from Chicago to Ontario?

    Yes. Cheapflights offers flight deals from Chicago to Ontario by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Chicago to Region of Ontario?

    Currently, January is the cheapest month in which you can book a flight from Chicago to Region of Ontario (average of $243). Flying from Chicago to Region of Ontario in August is currently the most expensive (average of $348). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Chicago to Ontario

See prices for flight routes from nearby airports that may be better suited for you.
O'Hare Intl to Pearson Intl flights
O'Hare Intl to Vancouver Intl flights
O'Hare Intl to Pierre Elliott Trudeau Intl flights
O'Hare Intl to Calgary flights
Midway to Toronto Island flights
Midway to Pearson Intl flights
O'Hare Intl to Toronto Island flights
Midway to Vancouver Intl flights
Midway to Pierre Elliott Trudeau Intl flights
St. Louis to Pierre Elliott Trudeau Intl flights
O'Hare Intl to Québec City flights
O'Hare Intl to Abbotsford flights
O'Hare Intl to Edmonton flights
Midway to Calgary flights
St. Louis to Pearson Intl flights
O'Hare Intl to Winnipeg flights
O'Hare Intl to Halifax flights
O'Hare Intl to Ottawa flights
Midway to Edmonton flights
Midway to Québec City flights
St. Louis to Vancouver Intl flights
O'Hare Intl to Kelowna flights
St. Louis to Calgary flights
Midway to Halifax flights
O'Hare Intl to Hamilton flights
Midway to Ottawa flights
St. Louis to Québec City flights
Midway to Winnipeg flights
O'Hare Intl to St. John's flights
O'Hare Intl to Victoria flights
Midway to Kelowna flights
St. Louis to Halifax flights
St. Louis to Edmonton flights
Moline to Calgary flights
O'Hare Intl to Charlottetown flights
O'Hare Intl to Sydney flights
Bloomington to Halifax flights
Midway to Victoria flights
St. Louis to Winnipeg flights
O'Hare Intl to Saskatoon flights
O'Hare Intl to Regina flights
Midway to St. John's flights
St. Louis to Ottawa flights
O'Hare Intl to Deer Lake flights
Moline to Pearson Intl flights
O'Hare Intl to London flights
Evansville to Pearson Intl flights
Dubuque to Edmonton flights
O'Hare Intl to Fredericton flights

Top 4 airlines flying from Chicago to Ontario

Discover the top 4 airlines that operate flights from Chicago to Ontario. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated agosto 21, 2025.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapest$120Average$321FlexibilityNo cancel feeOn-time67%
United AirlinesCheapest$145Average$439FlexibilityNo cancel feeOn-time69%
Porter AirlinesCheapest$187Average$333FlexibilityNo cancel feeOn-time52%
American AirlinesCheapest$218Average$388FlexibilityNo cancel feeOn-time71%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.