Cheap flights from Ontario (ONT) to Chicago (CHI)

ONT — CHI
Oct 4 — Oct 111

The best prices from Ontario to Chicago are usually found in September or October, booked 26 days in advance, depart on a Thursday or Saturday and return on a Wednesday

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 2022: compare Ontario to Chicago flight prices with the expected peak season, weather and rainfall in Chicago.

ONT - CHI

Price

$189 - $468

CHI

Temperature

23 - 73.4 °F

CHI

Rainfall

1.7 - 4.9 inches

Popular inJulyHigh demand for flights, 31% potential price rise
Cheapest inSeptemberBest time to find cheap flights, 42% potential price drop
Round-trip from$189From Ontario to Chicago (CHI)
One-way from$70One-way flight from Ontario to Chicago (CHI)

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

Departing on a Wednesday is a good option for securing a great price. You can expect to save up to 27% when planning your travel around this day of the week.

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

When searching for a good deal, it’s best to be prepared for potential fluctuations in price. We recommend booking at least 30 days in advance, which can save you up to 24% on flights from Ontario to Chicago compared to booking the week you need them. Waiting 30 days out may not be for everyone, so we have options available for flights within the next two weeks, with the lowest price starting at $358. For sooner than that we have options available in the next 3 days from $421.

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

Due to multiple factors, expect to potentially pay more when booking in June. For low rates, February can be a great choice for travel to Chicago. Flights to Chicago from Ontario in February are about $296 on average during February, but can be found for as low as $85.

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

Unlike at noon, when flights are generally more expensive, you can save up to 49% on flights from Ontario to Chicago by exploring options for tickets in the morning.

Cheap flights from Ontario to Chicago in September, October 2022

The best prices found for ONT to CHI flights for September, October
Oct 19 - Oct 22
ONT

Ontario

MDW

Chicago Midway

Nonstop

3h 52m
MDW

Chicago Midway

ONT

Ontario

Nonstop

4h 29m
$133

Frontier

Pick Dates

Deal found 9/27/22

Oct 25 - Nov 2
ONT

Ontario

MDW

Chicago Midway

Nonstop

3h 52m
MDW

Chicago Midway

ONT

Ontario

Nonstop

4h 29m
$139

Frontier

Pick Dates

Deal found 9/27/22

Oct 19 - Oct 22
ONT

Ontario

MDW

Chicago Midway

Nonstop

3h 52m
MDW

Chicago Midway

ONT

Ontario

1 stop

6h 21m
$143

Frontier

Pick Dates

Deal found 9/27/22

Ontario to Chicago 2022 flight deals

Cheap flights to Chicago from Ontario found for this year
Oct 19 - Oct 22
ONT

Ontario

MDW

Chicago Midway

Nonstop

3h 52m
MDW

Chicago Midway

ONT

Ontario

Nonstop

4h 29m
$133

Frontier

Pick Dates

Deal found 9/27/22

Nov 8 - Nov 14
ONT

Ontario

MDW

Chicago Midway

Nonstop

3h 52m
MDW

Chicago Midway

ONT

Ontario

Nonstop

4h 29m
$134

Frontier

Pick Dates

Deal found 9/29/22

Oct 25 - Nov 2
ONT

Ontario

MDW

Chicago Midway

Nonstop

3h 52m
MDW

Chicago Midway

ONT

Ontario

Nonstop

4h 29m
$139

Frontier

Pick Dates

Deal found 9/27/22

Cheap Frontier flights from Ontario to Chicago

Oct 19 - Oct 22
ONT

Ontario

MDW

Chicago Midway

Nonstop

3h 52m
MDW

Chicago Midway

ONT

Ontario

Nonstop

4h 29m
$133

Frontier

Pick Dates

Deal found 9/27/22

Oct 25 - Nov 2
ONT

Ontario

MDW

Chicago Midway

Nonstop

3h 52m
MDW

Chicago Midway

ONT

Ontario

Nonstop

4h 29m
$139

Frontier

Pick Dates

Deal found 9/27/22

Dec 13 - Jan 10
ONT

Ontario

MDW

Chicago Midway

Nonstop

3h 52m
MDW

Chicago Midway

ONT

Ontario

Nonstop

4h 34m
$140

Frontier

Pick Dates

Deal found 9/27/22

Cheap United Airlines flights from Ontario to Chicago

Oct 5 - Oct 28
ONT

Ontario

ORD

Chicago O'Hare Intl

1 stop

5h 57m
ORD

Chicago O'Hare Intl

ONT

Ontario

1 stop

9h 52m
$366

United Airlines

Pick Dates

Deal found 9/28/22

Oct 5 - Oct 8
ONT

Ontario

ORD

Chicago O'Hare Intl

1 stop

5h 57m
ORD

Chicago O'Hare Intl

ONT

Ontario

1 stop

8h 12m
$426

United Airlines

Pick Dates

Deal found 9/28/22

Non-stop flights to Chicago from Ontario

Save time with Ontario to Chicago direct flight deals
Oct 19 - Oct 22
ONT

Ontario

MDW

Chicago Midway

Nonstop

3h 52m
MDW

Chicago Midway

ONT

Ontario

Nonstop

4h 29m
$133

Frontier

Pick Dates

Deal found 9/27/22

Nov 8 - Nov 14
ONT

Ontario

MDW

Chicago Midway

Nonstop

3h 52m
MDW

Chicago Midway

ONT

Ontario

Nonstop

4h 29m
$134

Frontier

Pick Dates

Deal found 9/29/22

Oct 25 - Nov 2
ONT

Ontario

MDW

Chicago Midway

Nonstop

3h 52m
MDW

Chicago Midway

ONT

Ontario

Nonstop

4h 29m
$139

Frontier

Pick Dates

Deal found 9/27/22

Last minute flights from Ontario to Chicago

Late deals on return flights to Chicago from Ontario, departing today and this week
Oct 7 - Oct 11
ONT

Ontario

MDW

Chicago Midway

1 stop

12h 26m
MDW

Chicago Midway

ONT

Ontario

Nonstop

4h 29m
$157

Frontier

Pick Dates

Deal found 9/28/22

Oct 5 - Oct 8
ONT

Ontario

MDW

Chicago Midway

1 stop

5h 59m
MDW

Chicago Midway

ONT

Ontario

1 stop

6h 21m
$160

Frontier

Pick Dates

Deal found 9/27/22

Oct 4 - Oct 12
ONT

Ontario

MDW

Chicago Midway

1 stop

13h 42m
MDW

Chicago Midway

ONT

Ontario

Nonstop

4h 29m
$161

Frontier

Pick Dates

Deal found 9/28/22

One-way flights to Chicago from Ontario

The cheapest one-way flights from Ontario to Chicago
Oct 20
ONT

Ontario

MDW

Chicago Midway

Nonstop

3h 52m
$70

Frontier

Pick Dates

Deal found 9/28/22

Oct 25
ONT

Ontario

MDW

Chicago Midway

Nonstop

3h 52m
$71

Frontier

Pick Dates

Deal found 9/26/22

Oct 11
ONT

Ontario

MDW

Chicago Midway

Nonstop

3h 52m
$73

Frontier

Pick Dates

Deal found 9/27/22

Related info for your journey

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

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.

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. Frontier, American Airlines, and United Airlines are some of the carriers where you may find flexible cancellation policies. You can use our site to filter for airlines like Frontier with this kind of flexibility.

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 $133, but on average you can expect to pay $148.

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 $152.

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

Cheapflights users have booked flights from Ontario to Chicago round-trip from $133. This flight start at 59% lower than the current average price 3 months from now.

What are the most popular routes from Ontario to Chicago?

Most travelers choose Ontario - Chicago O'Hare Intl, Ontario - Chicago Midway or Ontario - Chicago Greater Rockford when deciding on the best route from Ontario to Chicago.

What are the most popular airlines that fly from Ontario to Chicago?

Undisclosed Carrier, American Airlines and Delta are the most popular airlines when flying from Ontario to Chicago.

What are the cheapest flights from Ontario to Chicago?

On average you can expect to pay $621 for a flight from Ontario to Chicago. The cheapest flight overall is $123 while the most popular route, (Ontario - Chicago O'Hare Intl) is currently priced at $168.

Alternative routes for Ontario to Chicago

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

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.
AirlineCheapestAverageFlexibilityOn-timeCOVID-19 safety
Juneyao AirlinesCheapest$12Average$20FlexibilityNo cancel feeOn-time66%COVID-19 safety
Search Juneyao Airlines flights
FrontierCheapest$60Average$201FlexibilityNo cancel feeOn-time62%COVID-19 safety
Search Frontier flights
Spirit AirlinesCheapest$145Average$368FlexibilityNo cancel feeOn-time65%COVID-19 safety
Search Spirit Airlines flights
DeltaCheapest$183Average$587FlexibilityNo cancel feeOn-timeN/ACOVID-19 safety
Search Delta flights
American AirlinesCheapest$218Average$448FlexibilityNo cancel feeOn-time71%COVID-19 safety
Search American Airlines flights
United AirlinesCheapest$265Average$554FlexibilityNo cancel feeOn-time69%COVID-19 safety
Search United Airlines flights

Hourly flight availability from Ontario to Chicago

See what time of day planes typically take off from Ontario to Chicago
0%of flight departuresEarly morningMidnight to 6 am
100%of flight departuresMorning6 am to noon
0%of flight departuresAfternoonNoon to 6 pm
0%of flight departuresEvening6 pm to midnight
Midnight
6 AM
Noon
6 PM

Weekly flight availability from Ontario to Chicago

See how many times per day planes take to the skies headed from Ontario to Chicago
Sunday0daily flights
Monday2daily flights
Tuesday2daily flights
Wednesday3daily flights
Thursday2daily flights
Friday3daily flights
Saturday1daily flight