Cheap flights from Chicago to Ontario (CHI - ONT)

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The best prices from Chicago to Ontario are usually found in September or August, booked 31 days in advance, depart on a Wednesday or Thursday and return on a Thursday

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

All the information you need to plan the best CHI to ONT flight in 2022: compare Chicago to Ontario flight prices with the expected peak season, weather and rainfall in Ontario.
CHI - ONT
Price
$186 - $494
ONT
Temperature
53.6 - 78.8 °F
ONT
Rainfall
0.1 - 3.4 inches

Popular in

March

High demand for flights, 39% potential price rise

Cheapest in

September

Best time to find cheap flights, 38% potential price drop

Round-trip from

$186

From Chicago (CHI) to Ontario

One-way from

$122

One-way flight from Chicago (CHI) to Ontario

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

Due to multiple factors, expect to potentially pay more when booking in May. For low rates, October can be a great choice for travel to Ontario. Flights to Ontario from Chicago in October are about $247 on average during October, but can be found for as low as $87.

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

Find a great deal and save up to 28% by booking at least 61 days prior to your desired departure date, rather than waiting until the week of travel. According to our data, there are a number of flights available from Chicago to Ontario within the next two weeks, with the cheapest ticket starting at $258.

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

Tuesday is generally a great day to depart. Flying on this day could help you save up to 57%.

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

Unlike at noon, when flights are generally more expensive, you can save up to 43% on flights from Chicago to Ontario by exploring options for tickets in the evening.

Cheap flights from Chicago to Ontario in June, July 2022

The best prices found for CHI to ONT flights for June, July
17 Jul - 19 Jul
$269pp
MDW
Chicago Midway
Frontier
 
1 STOP
ONT
Ontario
ONT
Ontario
Frontier
 
1 STOP
MDW
Chicago Midway
12 Jul - 13 Jul
$300pp
ORD
Chicago O'Hare Intl
Multiple Airlines
 
1 STOP
ONT
Ontario
ONT
Ontario
Multiple Airlines
 
1 STOP
ORD
Chicago O'Hare Intl
16 Jul - 19 Jul
$311pp
ORD
Chicago O'Hare Intl
Multiple Airlines
 
1 STOP
ONT
Ontario
ONT
Ontario
Multiple Airlines
 
1 STOP
ORD
Chicago O'Hare Intl

Chicago to Ontario 2022 flight deals

Cheap flights to Ontario from Chicago found for this year
16 Aug - 27 Aug
$231pp
MDW
Chicago Midway
Frontier
Non-Stop
ONT
Ontario
ONT
Ontario
Frontier
Non-Stop
MDW
Chicago Midway
16 Aug - 24 Aug
$236pp
MDW
Chicago Midway
Frontier
Non-Stop
ONT
Ontario
ONT
Ontario
Frontier
Non-Stop
MDW
Chicago Midway
16 Aug - 23 Aug
$240pp
MDW
Chicago Midway
Frontier
Non-Stop
ONT
Ontario
ONT
Ontario
Frontier
Non-Stop
MDW
Chicago Midway

Non-stop flights to Ontario from Chicago

Save time with Chicago to Ontario direct flight deals
16 Aug - 27 Aug
$231pp
MDW
Chicago Midway
Frontier
Non-Stop
ONT
Ontario
ONT
Ontario
Frontier
Non-Stop
MDW
Chicago Midway
16 Aug - 24 Aug
$236pp
MDW
Chicago Midway
Frontier
Non-Stop
ONT
Ontario
ONT
Ontario
Frontier
Non-Stop
MDW
Chicago Midway
16 Aug - 23 Aug
$240pp
MDW
Chicago Midway
Frontier
Non-Stop
ONT
Ontario
ONT
Ontario
Frontier
Non-Stop
MDW
Chicago Midway

Last minute flights from Chicago to Ontario

Late deals on round-trip flights to Ontario from Chicago, departing today and this week
4 Jul - 18 Jul
$375pp
ORD
Chicago O'Hare Intl
Multiple Airlines
 
1 STOP
ONT
Ontario
ONT
Ontario
American Airlines
 
1 STOP
ORD
Chicago O'Hare Intl
6 Jul - 11 Jul
$376pp
ORD
Chicago O'Hare Intl
Multiple Airlines
 
1 STOP
ONT
Ontario
ONT
Ontario
Multiple Airlines
 
1 STOP
ORD
Chicago O'Hare Intl
4 Jul - 10 Jul
$379pp
ORD
Chicago O'Hare Intl
Multiple Airlines
 
1 STOP
ONT
Ontario
ONT
Ontario
American Airlines
 
1 STOP
ORD
Chicago O'Hare Intl

One-way flights to Ontario from Chicago

The cheapest one-way flights from Chicago to Ontario
3:32 am - 5:34 am
Frontier
Nonstop
4h 02m
MDW - ONT
Frontier
$122
Flights by SU
3:32 am - 5:34 am
Frontier
Nonstop
4h 02m
MDW - ONT
Frontier
$123
Travelocity
3:32 am - 5:34 am
Frontier
Nonstop
4h 02m
MDW - ONT
Frontier
$128
Orbitz

Related info for your journey

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

Flight FAQs

From Chicago to Ontario

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

Ontario (ONT) is the airport you will fly into if you book a flight from Chicago to Ontario. You should not have trouble finding flights to Ontario from Chicago; the airport handles an average of 1 inbound flight from Chicago per day. You should also have plenty of airline options to choose from since 7 airlines have flights to the Ontario airport from Chicago. It is only a 3.1 mi journey from Ontario (ONT) to Ontario’s city center.

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

Frontier, American Airlines, and United Airlines are some of the carriers that may have flexible cancellation policies. You can use our site to filter for other airlines that may also have this kind of flexibility.

Can I find flights from Chicago to Ontario for under $300 on Cheapflights?

Yes, there are multiple flights from Chicago to Ontario for under $300. The cheapest flight booked recently is on Frontier for just $231, but on average you can expect to pay $254.

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

Cheapflights has at least 20 direct flights from Chicago to Ontario under $300. A good price for a nonstop flight from Chicago to Ontario is less than $259.

Are there last-minute flights available from Chicago to Ontario for under $400?

There are currently 20+ open flights from Chicago to Ontario within the next 7 days for less than $400.

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

Flying on Frontier is currently your cheapest option to Ontario, with prices starting at $231. Frontier is currently priced 23% below the average price you’ll pay for this route.

What are the cheapest flights from Chicago to Ontario?

While on average a flight from Chicago to Ontario is generally $543, our data shows the cheapest flight currently is $185. When looking at the most popular route, (Chicago O'Hare Intl - Ontario), you can expect to pay $273 for that flight.

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

Before booking your flight from Chicago to Ontario check out the most popular airlines for this route: American Airlines, Alaska Airlines or Delta.

COVID Restrictions

View COVID Travel Restrictions for Ontario, CA

Do I need a COVID test to fly to Ontario from Chicago?

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

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

COVID-19 testing requirements
Visitors from Chicago are not required to present a negative COVID-19 PCR test or antigen result upon entering Ontario.

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

Do I need a test to fly back to Chicago from Ontario?

Returning to Chicago from Ontario

COVID-19 testing requirements
Visitors from Ontario are not required to present a negative COVID-19 PCR test or antigen result upon entering Chicago.

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

Hide COVID Travel Restrictions for Ontario, CA

Alternative routes for Chicago to Ontario

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

Destination information for Ontario

Things to know before you go - useful duration and weather info for your trip from Chicago to Ontario.
Flight duration from Chicago to ONT
3h 59m

Airports servicing Chicago

Midway (MDW)
Rockford (RFD)

Airports servicing Ontario

Top 6 airlines flying from Chicago to Ontario

The chart below displays the airlines Cheapflights users traveling from Chicago to Ontario 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
Juneyao Airlines
$16 $21 No cancel fee 66%

We couldn't confirm the COVID-19 safety measures taken by Juneyao Airlines. Please check directly on their website for additional information.

Frontier
$64 $241 No cancel fee 62%
American Airlines
$98 $377 No cancel fee 71%
Delta
$107 $415 No cancel fee N/A
Spirit Airlines
$172 $324 No cancel fee 65%
United Airlines
$224 $631 No cancel fee 69%

Hourly flight availability from Chicago to Ontario

See what time of day planes typically take off from Chicago towards Ontario.
Morning 6 AM to noon 100% of CHI to ONT departures
Early morning Midnight to 6 AM 0% of CHI to ONT departures
Afternoon Noon to 6 PM 0% of CHI to ONT departures
Evening 6 PM to midnight 0% of CHI to ONT departures
Midnight
6 AM
Noon
6 PM
Weekly flight availability
from Chicago to Ontario
See how many times per day planes take to the skies headed from Chicago to Ontario.
Sunday
1 daily flight
Monday
1 daily flight
Tuesday
1 daily flight
Wednesday
1 daily flight
Thursday
1 daily flight
Friday
1 daily flight
Saturday
1 daily flight
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