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)

All the information you need to plan the best ONT to CHI flight in 2021: compare Ontario to Chicago flight prices with the expected peak season, weather and rainfall in Chicago.
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

$109

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 13% on flights from Ontario to Chicago by exploring options for tickets at noon.

Cheap flights from Ontario to Chicago in May, June 2021

The best prices found for ONT to CHI flights for May, June
9 Jun - 18 Jun
$123pp
ONT
Ontario
Frontier
Non-Stop
ORD
Chicago O'Hare Intl
ORD
Chicago O'Hare Intl
Frontier
Non-Stop
ONT
Ontario
17 May - 19 May
$163pp
ONT
Ontario
Frontier
 
1 STOP
ORD
Chicago O'Hare Intl
ORD
Chicago O'Hare Intl
Frontier
 
1 STOP
ONT
Ontario
23 Jun - 30 Jun
$165pp
ONT
Ontario
Frontier
Non-Stop
ORD
Chicago O'Hare Intl
ORD
Chicago O'Hare Intl
Frontier
Non-Stop
ONT
Ontario

Ontario to Chicago 2021 flight deals

Cheap flights to Chicago from Ontario found for this year
9 Jun - 18 Jun
$123pp
ONT
Ontario
Frontier
Non-Stop
ORD
Chicago O'Hare Intl
ORD
Chicago O'Hare Intl
Frontier
Non-Stop
ONT
Ontario
17 May - 19 May
$163pp
ONT
Ontario
Frontier
 
1 STOP
ORD
Chicago O'Hare Intl
ORD
Chicago O'Hare Intl
Frontier
 
1 STOP
ONT
Ontario
30 Jul - 11 Aug
$165pp
ONT
Ontario
Frontier
Non-Stop
ORD
Chicago O'Hare Intl
ORD
Chicago O'Hare Intl
Frontier
Non-Stop
ONT
Ontario

Non-stop flights to Chicago from Ontario

Save time with Ontario to Chicago direct flight deals
9 Jun - 18 Jun
$123pp
ONT
Ontario
Frontier
Non-Stop
ORD
Chicago O'Hare Intl
ORD
Chicago O'Hare Intl
Frontier
Non-Stop
ONT
Ontario
30 Jul - 11 Aug
$165pp
ONT
Ontario
Frontier
Non-Stop
ORD
Chicago O'Hare Intl
ORD
Chicago O'Hare Intl
Frontier
Non-Stop
ONT
Ontario
21 Jun - 13 Sep
$168pp
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
17 May - 19 May
$163pp
ONT
Ontario
Frontier
 
1 STOP
ORD
Chicago O'Hare Intl
ORD
Chicago O'Hare Intl
Frontier
 
1 STOP
ONT
Ontario
17 May - 19 May
$207pp
ONT
Ontario
Multiple Airlines
   
2 STOPS
ORD
Chicago O'Hare Intl
ORD
Chicago O'Hare Intl
Frontier
 
1 STOP
ONT
Ontario
20 May - 22 May
$208pp
ONT
Ontario
Multiple Airlines
 
1 STOP
ORD
Chicago O'Hare Intl
ORD
Chicago O'Hare Intl
Multiple Airlines
 
1 STOP
ONT
Ontario

One-way flights to Chicago from Ontario

The cheapest one-way flights from Ontario to Chicago
9:00 am - 5:13 pm
United Airlines
1 Stop
6h 13m
ONT - ORD
United Airlines
$109
United
6:55 pm - 4:30 am
Delta
1 Stop
7h 35m
ONT - ORD
Delta
$119
Delta
12:36 pm - 8:59 pm
Major Airline
1 Stop
6h 23m
ONT - ORD
Major Airline
$125
StudentUniverse

Related info for your journey

Useful info, stats and facts about <span class="emphasized">Ontario</span> to <span class="emphasized">Chicago</span> 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 is one 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.

What airport do you fly from for flights from Ontario to Chicago?

Ontario (ONT) is the airport you will fly out of if you book a flight from Ontario to Chicago. You should not have trouble finding flights to Chicago from Ontario; the airport handles an average of 1 outbound flight to Chicago per day. You should also have plenty of airline options to choose from since 8 airlines have flights from the Ontario airport to Chicago. It is only a 3.1 mi journey to Ontario (ONT) from Ontario’s city center.

Can I find flights from Ontario to Chicago for under $200 on Cheapflights?

Yes, there are multiple flights from Ontario to Chicago for under $200. The cheapest flight booked recently is on Frontier for just $123, but on average you can expect to pay $188.

Are there nonstop flights from Ontario to Chicago for under $200 on Cheapflights?

Cheapflights has at least 20 direct flights from Ontario to Chicago under $200. A good price for a nonstop flight from Ontario to Chicago is less than $223.

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, Monday, Wednesday, Thursday, Friday, Saturday.

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 4h. Frontier provides one of the quickest options available for as low as $123. Both multi-stop and nonstop flights can be found to your destination and back.

What are the cheapest airlines flying from Ontario to Chicago round-trip?

According to our current data, Frontier ($123), and Delta ($217) offers the cheapest pricing from Ontario to Chicago. Frontier is currently priced 54% 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 $64. However, be on the lookout for offers from United Airlines and Delta, as they are both options that can get you from Ontario to Chicago for a low price.

Alternative routes for Ontario to Chicago

See prices for flight routes from nearby airports that may be better suited for you.

Destination information for Chicago

Things to know before you go - useful duration and weather info for your trip from Ontario to Chicago.
Flight duration
4h 09m
Average temperature for May in Chicago
71.6 °F
Avg rainfall for May in Chicago
4.3 ″

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
See how many times per day planes take to the skies headed from Ontario to Chicago.
Sunday
3 daily flights
Monday
3 daily flights
Tuesday
0 flights
Wednesday
0 flights
Thursday
3 daily flights
Friday
3 daily flights
Saturday
0 flights
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