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Cheap flights from Ontario to Chicago (ONT - CHI)

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The best prices from Ontario to Chicago are usually found in July or August, booked 60 days in advance, depart on a Tuesday or Saturday and return on a Saturday

How to find the cheapest flight from
Ontario (ONT) to Chicago (CHI)

ONT - CHI
Price
$245 - $312
CHI
Temperature
33.8 - 84.2 °F
CHI
Rainfall
0.7 - 4.3 inches

Popular in

December

High demand for flights, 13% potential price rise

Cheapest in

July

Best time to find cheap flights, 9% potential price drop

Round-trip from

$245

From Ontario to Chicago

One-way from

$120

One-way flight from Ontario to Chicago

Flight route prices based on searches on Cheapflights within the last 3 days, monthly prices based on aggregated historical data.
What is the cheapest day to fly round-trip from Ontario to Chicago?

Flights from Ontario to Chicago are found to be more expensive on Saturday. This shouldn't discourage you from searching as you can still find great deals by being flexible with your options. Use our search form to find deals on tickets to Chicago.

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

To save up to 10% on this flight, we recommend booking at least 20 days prior to travel. The price may fluctuate and will likely increase closer to your departure date. Users on Cheapflights have found tickets from Ontario to Chicago from $137 1-2 weeks out and tickets from $157 for flights departing within the next 72 hours.

What is the cheapest month to fly from Ontario to Chicago?

Flights from Ontario to Chicago lean towards being more expensive in December. Prices are generally better when you fly from Ontario to Chicago in April, with the cheapest ticket starting at $33.

When is the cheapest time to fly from Ontario to Chicago (ONT - CHI)?

Unlike in the morning, when flights are generally more expensive, you can save up to 11% on flights from Ontario to Chicago by exploring options for tickets at noon.

Cheap flights from Ontario to Chicago in January, February 2021

The best prices found for ONT to CHI flights for January, February
25 Feb - 28 Feb
$88pp
ONT
Ontario
Frontier
 
1 STOP
ORD
Chicago O'Hare Intl
ORD
Chicago O'Hare Intl
Frontier
 
1 STOP
ONT
Ontario
19 Feb - 21 Feb
$118pp
ONT
Ontario
Frontier
 
1 STOP
ORD
Chicago O'Hare Intl
ORD
Chicago O'Hare Intl
Frontier
 
1 STOP
ONT
Ontario
11 Feb - 14 Feb
$137pp
ONT
Ontario
Frontier
 
1 STOP
ORD
Chicago O'Hare Intl
ORD
Chicago O'Hare Intl
Frontier
 
1 STOP
ONT
Ontario

Ontario to Chicago 2021 flight deals

Cheap flights to Chicago from Ontario found for this year
25 Feb - 28 Feb
$88pp
ONT
Ontario
Frontier
 
1 STOP
ORD
Chicago O'Hare Intl
ORD
Chicago O'Hare Intl
Frontier
 
1 STOP
ONT
Ontario
19 Feb - 21 Feb
$118pp
ONT
Ontario
Frontier
 
1 STOP
ORD
Chicago O'Hare Intl
ORD
Chicago O'Hare Intl
Frontier
 
1 STOP
ONT
Ontario
11 Feb - 14 Feb
$137pp
ONT
Ontario
Frontier
 
1 STOP
ORD
Chicago O'Hare Intl
ORD
Chicago O'Hare Intl
Frontier
 
1 STOP
ONT
Ontario

Non-stop flights to Chicago from Ontario

Save time with Ontario to Chicago direct flight deals
3 Jun - 10 Jun
$235pp
ONT
Ontario
Frontier
Non-Stop
ORD
Chicago O'Hare Intl
ORD
Chicago O'Hare Intl
Frontier
Non-Stop
ONT
Ontario
14 May - 17 May
$256pp
ONT
Ontario
Frontier
Non-Stop
ORD
Chicago O'Hare Intl
ORD
Chicago O'Hare Intl
Frontier
Non-Stop
ONT
Ontario
3 Jun - 11 Jun
$257pp
ONT
Ontario
Frontier
Non-Stop
ORD
Chicago O'Hare Intl
ORD
Chicago O'Hare Intl
Frontier
Non-Stop
ONT
Ontario

Last minute flights from Ontario to Chicago

Late deals on round-trip flights to Chicago from Ontario, departing today and this week
29 Jan - 14 Feb
$148pp
ONT
Ontario
Frontier
 
1 STOP
ORD
Chicago O'Hare Intl
ORD
Chicago O'Hare Intl
Frontier
 
1 STOP
ONT
Ontario
29 Jan - 31 Jan
$150pp
ONT
Ontario
Multiple Airlines
 
1 STOP
ORD
Chicago O'Hare Intl
ORD
Chicago O'Hare Intl
Multiple Airlines
   
2 STOPS
ONT
Ontario
25 Jan - 31 Jan
$168pp
ONT
Ontario
Multiple Airlines
   
2 STOPS
ORD
Chicago O'Hare Intl
ORD
Chicago O'Hare Intl
Multiple Airlines
   
2 STOPS
ONT
Ontario

One-way flights to Chicago from Ontario

The cheapest one-way flights from Ontario to Chicago
3:36 am - 3:28 pm
Frontier
1 Stop
9h 52m
ONT - ORD
Frontier
$120
Kiwi.com
2:44 pm - 3:51 am
Multiple Airlines
3 Stops
35h 07m
ONT - ORD
Multiple Airlines
$127
Gotogate
1:30 am - 6:43 pm
American Airlines
2 Stops
15h 13m
ONT - ORD
American Airlines

Related info for your journey

Useful info, stats and facts about Ontario to Chicago flights.

Flight FAQs

From Ontario to Chicago

Are flight prices decreasing from Ontario to Chicago due to COVID-19 (coronavirus)?

At this time, Cheapflights has noticed price decreases for many domestic flights due to COVID-19. Travel is not necessarily recommended at this time, and flights may be prone to cancellation: please check with local authorities in both Ontario and Chicago for travel alerts, and be sure to review the airline's cancellation policy and travel advisories before booking. For more information, please view our post on what to know about COVID-19 (coronavirus) and travel.

What safety measures are being taken by airlines flying from Ontario to Chicago to control the spread of COVID-19?

Alaska Airlines and Delta are some of the many airlines that have implemented additional safety measures to control the spread of COVID-19. Some of the new policies that have been implemented to accommodate travelers flying from Ontario to Chicago are improved sanitation, HEPA filters, mask requirements, social distance seating (for a limited time), and pre-flight testing for antibodies and symptoms. Policies will vary by airline.

Which airlines flying from Ontario to Chicago have flexible cancellations due to COVID-19?

Some of our airline partners flying from Ontario to Chicago have new flexible policies in place due to COVID-19. American Airlines, United Airlines, and Delta are some of the carriers where you may find flexible cancellation policies. You can use our site to filter for airlines like American Airlines with this kind of flexibility.

Can I find flights from Ontario to Chicago for under $100 on Cheapflights?

Yes, there are multiple flights from Ontario to Chicago for under $100. The cheapest flight booked recently is on Frontier for just $88, but on average you can expect to pay $148.

Are there nonstop flights from Ontario to Chicago for under $300 on Cheapflights?

Cheapflights has at least 7 direct flights from Ontario to Chicago under $300. A good price for a nonstop flight from Ontario to Chicago is less than $299.

Are there last-minute flights available from Ontario to Chicago for under $200?

There are currently 20+ open flights from Ontario to Chicago within the next 7 days for less than $200.

What days are nonstop flights available from Ontario to Chicago?

Nonstop flights are available for this route on the following days: Sunday, Tuesday, Wednesday, Friday.

Is Ontario weather warmer or cooler than Chicago?

You can imagine temperatures to be in the 95 °F range in July. The weather in Chicago is generally colder than Ontario's. As flight availability is subject to become more limited as peak season approaches it is ideal to book in a timely manner.

How long is the flight from Ontario to Chicago?

A quick flight from Ontario to Chicago can take about 7h 04m. Delta provides one of the quickest options available for as low as $273. Both multi-stop and nonstop flights can be found to your destination and back.

What is the cheapest airline to fly from Ontario to Chicago round-trip?

According to our current data, Frontier ($88), offers the cheapest pricing from Ontario to Chicago. Frontier is currently priced 67% below the average price you’ll pay for this route.

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

The cheapest airline one-way is Frontier, with whom users have recently found tickets for as low as $50. However, be on the lookout for offers from Delta and American Airlines, as they are both options that can get you from Ontario to Chicago for a low price.

Alternative routes for Ontario to Chicago

Destination information for Chicago

Things to know before you go. Useful info for your trip from Ontario to Chicago
Average temperature for January in Chicago
33.8 °F
Avg rainfall for January in Chicago
0.7 ″

Airports servicing Ontario

Airports servicing Chicago

Chicago Midway (MDW)
Rockford (RFD)

Top 6 airlines flying from Ontario to Chicago

The chart below displays the airlines Cheapflights users traveling from Ontario to Chicago choose most often. Cheapest and average prices are based on aggregated data from the past 12 months.

Airline Cheapest Average Flexibility On-time COVID-19 safety
Spirit Airlines
$95 $215 No cancel fee 65%
Frontier
$117 $257 No cancel fee 62%
United Airlines
$122 $276 No cancel fee 69%
American Airlines
$109 $296 No cancel fee 71%
Delta
$122 $460 No cancel fee N/A
Southwest
$418 $499 No cancel fee 63%
Weekly flight availability
from Ontario to Chicago
Sunday
0 flights
Monday
0 flights
Tuesday
0 flights
Wednesday
0 flights
Thursday
0 flights
Friday
0 flights
Saturday
1 daily flight
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