Chicago

Cheap flights from Ontario to Chicago (ONT - CHI)

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 to Chicago

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

$245 - $312

CHI

Temperature

23 - 73.4 °F

CHI

Precipitation

1.7 - 4.9 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 (CHI)

One-way from

$98

One-way flight from Ontario to Chicago (CHI)

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

Departing on a Monday is a good option for securing a great price. You can expect to save up to 41% 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 16 days in advance, which can save you up to 4% on flights from Ontario to Chicago compared to booking the week you need them. Waiting 16 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 $175. For sooner than that we have options available in the next 3 days from $186.

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

Due to multiple factors, expect to potentially pay more when booking in December. For low rates, August can be a great choice for travel to Chicago. Flights to Chicago from Ontario in August are about $184 on average during August, but can be found for as low as $50.

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 January, February 2022

The best prices found for ONT to CHI flights for January, February
Feb 4 - Feb 7
ONT

Ontario

ORD

Chicago O'Hare Intl

1 stop

6h 00m
ORD

Chicago O'Hare Intl

ONT

Ontario

1 stop

13h 01m
$125

Frontier

View Deal

Deal found 1/19/22

Jan 24 - Feb 4
ONT

Ontario

ORD

Chicago O'Hare Intl

1 stop

19h 01m
ORD

Chicago O'Hare Intl

ONT

Ontario

1 stop

12h 36m
$127

Frontier

View Deal

Deal found 1/18/22

Feb 3 - Feb 5
ONT

Ontario

ORD

Chicago O'Hare Intl

1 stop

6h 54m
ORD

Chicago O'Hare Intl

ONT

Ontario

1 stop

11h 56m
$129

Frontier

View Deal

Deal found 1/19/22

Ontario to Chicago 2022 flight deals

Cheap flights to Chicago from Ontario found for this year
May 3 - May 10
ONT

Ontario

ORD

Chicago O'Hare Intl

Nonstop

3h 58m
ORD

Chicago O'Hare Intl

ONT

Ontario

Nonstop

4h 18m
$96

Frontier

View Deal

Deal found 1/20/22

May 3 - May 10
ONT

Ontario

ORD

Chicago O'Hare Intl

Nonstop

3h 58m
ORD

Chicago O'Hare Intl

ONT

Ontario

1 stop

12h 29m
$113

Frontier

View Deal

Deal found 1/20/22

Jan 26 - Jan 30
ONT

Ontario

ORD

Chicago O'Hare Intl

1 stop

15h 33m
ORD

Chicago O'Hare Intl

ONT

Ontario

1 stop

12h 38m
$120

Frontier

View Deal

Deal found 1/20/22

Non-stop flights to Chicago from Ontario

Save time with Ontario to Chicago direct flight deals
May 3 - May 10
ONT

Ontario

ORD

Chicago O'Hare Intl

Nonstop

3h 58m
ORD

Chicago O'Hare Intl

ONT

Ontario

Nonstop

4h 18m
$96

Frontier

View Deal

Deal found 1/20/22

May 3 - May 8
ONT

Ontario

ORD

Chicago O'Hare Intl

Nonstop

3h 58m
ORD

Chicago O'Hare Intl

ONT

Ontario

Nonstop

4h 18m
$120

Frontier

View Deal

Deal found 1/18/22

May 5 - May 8
ONT

Ontario

ORD

Chicago O'Hare Intl

Nonstop

3h 58m
ORD

Chicago O'Hare Intl

ONT

Ontario

Nonstop

4h 18m
$140

Frontier

View Deal

Deal found 1/17/22

Last minute flights from Ontario to Chicago

Late deals on return flights to Chicago from Ontario, departing today and this week
Jan 26 - Jan 30
ONT

Ontario

ORD

Chicago O'Hare Intl

1 stop

15h 33m
ORD

Chicago O'Hare Intl

ONT

Ontario

1 stop

12h 38m
$120

Frontier

View Deal

Deal found 1/20/22

Jan 25 - Jan 26
ONT

Ontario

ORD

Chicago O'Hare Intl

1 stop

5h 58m
ORD

Chicago O'Hare Intl

ONT

Ontario

1 stop

12h 01m
$136

Multiple Airlines

View Deal

Deal found 1/18/22

Jan 29 - Feb 4
ONT

Ontario

ORD

Chicago O'Hare Intl

1 stop

6h 38m
ORD

Chicago O'Hare Intl

ONT

Ontario

1 stop

12h 36m
$139

Frontier

View Deal

Deal found 1/20/22

One-way flights to Chicago All airports from Ontario

The cheapest one-way flights from Ontario to Chicago
May 10
ONT

Ontario

ORD

Chicago O'Hare Intl

Nonstop

3h 58m
$48

Frontier

View Deal

Deal found 1/19/22

Feb 3
ONT

Ontario

RFD

Chicago Greater Rockford

1 stop

11h 02m
$55

Multiple Airlines

View Deal

Deal found 1/18/22

Feb 3
ONT

Ontario

ORD

Chicago O'Hare Intl

1 stop

6h 54m
$58

Frontier

View Deal

Deal found 1/18/22

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 0 outbound flights 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. 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 $96, but on average you can expect to pay $135.

Are there nonstop flights from Ontario to Chicago for under $100 on Cheapflights?

Cheapflights has at least 20 direct flights from Ontario to Chicago under $100. A good price for a nonstop flight from Ontario to Chicago is less than $182.

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 $96. This flight start at 64% 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?

Major Airline, American Airlines and Alaska Airlines 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 $267 for a flight from Ontario to Chicago. The cheapest flight overall is $88 while the most popular route, (Ontario - Chicago O'Hare Intl) is currently priced at $129.

Can I fly to Chicago from Ontario right now?

Information is based on travel restrictions for travel to Chicago within the United States

Most visitors from Ontario need to provide a negative COVID-19 test result and/or quarantine to enter Chicago.

COVID-19 testing requirements
Visitors from Ontario must present a negative RT-PCR (NAAT) or Antigen (quick-test) test taken 24 hours before departing to Chicago.

Quarantine requirements
Visitors from Ontario are not required to quarantine after entering Chicago.

Can I fly back to Ontario from Chicago?

Returning to Ontario from Chicago

COVID-19 testing requirements
Visitors from Chicago must present a negative RT-PCR (NAAT) or Antigen (quick-test) test taken 24 hours before departing to Ontario.

Quarantine requirements
Visitors from Chicago are not required to quarantine after entering Ontario.

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
Spirit Airlines
Cheapest$95
Average$215
FlexibilityNo cancel fee
On-time65%
COVID-19 safety
American Airlines
Cheapest$109
Average$296
FlexibilityNo cancel fee
On-time71%
COVID-19 safety
Frontier
Cheapest$117
Average$257
FlexibilityNo cancel fee
On-time62%
COVID-19 safety
Delta
Cheapest$122
Average$460
FlexibilityNo cancel fee
On-timeN/A
COVID-19 safety
United Airlines
Cheapest$122
Average$276
FlexibilityNo cancel fee
On-time69%
COVID-19 safety
Southwest
Cheapest$418
Average$499
FlexibilityNo cancel fee
On-time63%
COVID-19 safety

Hourly flight availability from Ontario to Chicago

See what time of day planes typically take off from Ontario to Chicago
51%of flight departuresEarly morningMidnight to 6 am
33%of flight departuresMorning6 am to noon
16%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
Sunday1daily flight
Monday1daily flight
Tuesday0daily flights
Wednesday1daily flight
Thursday1daily flight
Friday1daily flight
Saturday0daily flights