$123+ Cheap flights from Ontario (ONT) to Chicago (CHI)
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 4/22. Fares are subject to change and may not be available on all flights or dates of travel.
Find cheap flights from Ontario to Chicago 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.The best prices from Ontario to Chicago are usually found in November or February, booked 88 days in advance, depart on a Wednesday or Tuesday and return on a Friday
Cheap flight deals from Ontario to Chicago
Discover tips and strategies to find the most affordable flight options for your journey from Ontario (ONT) to Chicago (CHI). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated January 16, 2025.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $158 (Mytrip) |
One-way from | $123 (Alaska Airlines) |
Popular in | December |
Cheapest in | November |
Average price | $361 |
Find flight deals from Ontario to Chicago
Cheapest flights from Ontario to ChicagoExplore the most affordable flight options available from Ontario to Chicago. Find the lowest fares from popular airlines and budget airlines, with prices last updated on January 16, 2025.
Explore the most affordable flight options available from Ontario to Chicago. Find the lowest fares from popular airlines and budget airlines, with prices last updated on January 16, 2025.
This Mytrip deal was found by Cheapflights users on 1/16. 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.
This Booking.com deal was found by Cheapflights users on 1/16. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This eDestinos deal was found by Cheapflights users on 1/16. 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 eDestinos is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This American Airlines deal was found by Cheapflights users on 1/16. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This KAYAK deal was found by Cheapflights users on 1/16. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This Delta deal was found by Cheapflights users on 1/16. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This Southwest deal was found by Cheapflights users on 1/16. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This Alaska Airlines deal was found by Cheapflights users on 1/16. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This United Airlines deal was found by Cheapflights users on 1/16. 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.
This Southwest deal was found by Cheapflights users on 1/16. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Find flights from Ontario to Chicago within your budget
Customize your flight search to find flights from Ontario to Chicago 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 January 16, 2025.
Fly from
Fly to
Route
Depart
Return
Price
OntarioChicago
ONT - MDW
ONTMDW
Ontario
Fri 2/7
10:40 am-12:17 am
1 stop11h 37m
Chicago Midway
Mon 2/10
7:15 am-5:28 pm
1 stop12h 13m
OntarioChicago
ONT - ORD
ONTORD
Ontario
Thu 2/13
12:59 am-12:44 am
1 stop21h 45m
Chicago O'Hare Intl
Sun 2/23
7:59 pm-7:26 am
1 stop13h 27m
OntarioChicago
ONT - ORD
ONTORD
Ontario
Mon 2/17
10:34 am-8:32 pm
2 stops31h 58m
Chicago O'Hare Intl
Tue 2/25
7:51 pm-3:19 pm
1 stop21h 28m
OntarioChicago
ONT - ORD
ONTORD
Ontario
Sun 2/16
11:59 pm-8:23 am
1 stop6h 24m
Chicago O'Hare Intl
Thu 2/27
1:54 pm-9:02 pm
1 stop9h 08m
OntarioChicago
ONT - ORD
ONTORD
Ontario
Tue 2/25
1:05 pm-11:48 pm
1 stop8h 43m
Chicago O'Hare Intl
Fri 2/28
5:45 am-11:55 am
1 stop8h 10m
OntarioChicago
ONT - MDW
ONTMDW
Ontario
Thu 2/27
7:05 am-4:20 pm
1 stop7h 15m
Chicago Midway
Tue 3/4
10:19 am-10:32 pm
2 stops14h 13m
OntarioChicago
ONT - MDW
ONTMDW
Ontario
Sat 2/15
7:05 am-12:50 pm
Nonstop3h 45m
Chicago Midway
Sat 2/22
8:10 am-10:45 am
Nonstop4h 35m
OntarioChicago
ONT - ORD
ONTORD
Ontario
Tue 4/15
6:00 am-5:55 pm
1 stop9h 55m
Chicago O'Hare Intl
Fri 4/18
3:16 pm-11:59 pm
1 stop10h 43m
OntarioChicago
ONT - ORD
ONTORD
Ontario
Thu 4/3
5:00 am-2:00 pm
1 stop7h 00m
Chicago O'Hare Intl
Mon 4/7
4:00 pm-11:20 pm
2 stops9h 20m
OntarioChicago
ONT - ORD
ONTORD
Ontario
Wed 5/21
4:10 pm-12:05 am
1 stop5h 55m
Chicago O'Hare Intl
Tue 6/3
10:50 am-5:25 pm
1 stop8h 35m
Compare providers for flights from Ontario to Chicago
Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Ontario to Chicago in January.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy2 stars | Trust Score*1 star | |
| Price Accuracy- | Trust Score*1 star |
- Most accurate provider: When it comes to deals on Ontario-Chicago flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Ontario-Chicago flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Ontario-Chicago flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on Ontario-Chicago flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Ontario-Chicago flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.
Best time to book a flight from Ontario to Chicago
Have a flexible travel schedule? Discover the best time to fly to Chicago from Ontario with our price prediction graph.
Travel insights for flights from Ontario to Chicago
Get recent, data-driven insights about flights from Ontario to Chicago including ideal travel times, pricing trends, and more.
How far ahead should I book a flight from Ontario to Chicago?
Use this chart to determine the optimal time to book a round-trip flight from Ontario to Chicago. Price data was last updated on January 10, 2025.
The best time to book flights from Ontario to Chicago is 88 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.
What is the cheapest month to book a flight from Ontario to Chicago?
Currently, August is the cheapest month in which you can book a flight from Ontario to Chicago (average of $245). Flying from Ontario to Chicago in March is currently the most expensive (average of $320). 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 ONT to CHI?
Find hourly flight availability from Ontario to Chicago. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated January 16, 2025.
Unlike in the morning, when flights are generally more expensive, you can save up to 30% on flights from Ontario to Chicago by exploring options for tickets in the evening.
What is the cheapest day to fly from Ontario to Chicago?
Use this chart to determine the cheapest time to fly round-trip from Ontario to Chicago. Price data was last updated on December 16, 2024.
Travelers seeking maximum savings on their Ontario to Chicago flight should consider departing on Saturday evenings when fares are most often at their lowest. Tuesday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.
Rainfall in Chicago by month
Plan your trip to Chicago by taking into account the average rainfall totals by month.
In terms of precipitation, rainfall in Chicago ranges from 1.7 - 4.9 inches per month. August is typically the wettest month, when rainfall can reach 4.9 in. January is typically the driest time to visit Chicago when rainfall is around 1.7 in.
Temperature in Chicago by month
Plan your trip to Chicago by taking into account the average temperature totals by month.
If weather is an important factor for your trip to Chicago, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 73.4 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 23.0 F).
Reviews of airlines servicing Chicago
Get insights into the airlines that provide service to Chicago. 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 Chicago. Reviews last updated January 16, 2025.
To help decide which airline to fly from Ontario to Chicago, see what other customers have to say about United Airlines, Delta and Alaska Airlines. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Entertainment
Overall
Crew
Comfort
Boarding
Food
Reviews
My original flight was delayed so they found this flight for me so I could arrive at a reasonable time
Entertainment
Overall
Crew
Comfort
Boarding
Food
Reviews
My original flight was delayed so they found this flight for me so I could arrive at a reasonable time
Entertainment
Overall
Crew
Comfort
Boarding
Food
Reviews
My original flight was delayed so they found this flight for me so I could arrive at a reasonable time
Entertainment
Overall
Crew
Comfort
Boarding
Food
Reviews
My original flight was delayed so they found this flight for me so I could arrive at a reasonable time
Entertainment
Overall
Crew
Comfort
Boarding
Food
Reviews
My original flight was delayed so they found this flight for me so I could arrive at a reasonable time
Entertainment
Overall
Crew
Comfort
Boarding
Food
Reviews
My original flight was delayed so they found this flight for me so I could arrive at a reasonable time
Related info for your journey
Find useful and relevant information for your journey from Ontario to Chicago. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
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Alternative routes for Ontario to Chicago
See prices for flight routes from nearby airports that may be better suited for you.
Top 7 airlines flying from Ontario to Chicago
Discover the top 7 airlines that operate flights from Ontario to Chicago. 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 January 16, 2025.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$92 | Average$177 | FlexibilityNo cancel fee | On-time65% | |
| Cheapest$108 | Average$193 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$161 | Average$438 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$236 | Average$420 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$246 | Average$454 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$247 | Average$383 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$358 | Average$505 | FlexibilityNo cancel fee | On-time63% |