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 $140. Frontier is currently priced 60% below the average price you’ll pay for this route.

How recently were the Chicago to Ontario flight deals updated?

The Chicago to Ontario flight deals you see on this page were last updated on 5/10.

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, Delta or Frontier.

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

Yes, there are multiple flights from Chicago to Ontario for under $200. The cheapest flight booked recently is on Frontier for just $140, but on average you can expect to pay $146.

Are there nonstop flights from Chicago to Ontario for under $800 on Cheapflights?

Cheapflights has at least 1 direct flight from Chicago to Ontario under $800. A good price for a nonstop flight from Chicago to Ontario is less than $747.

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

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

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 2 inbound flights from Chicago per day. You should also have plenty of airline options to choose from since 5 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.

What does ORD to ONT mean?

ORD stands for Chicago O'Hare Intl Airport, while ONT stands for Ontario Airport. These codes are often called IATA codes, a set of identifiers established by IATA (International Air Transport Association) that is widely used by airlines and the aviation industry. Chicago Midway Airport (MDW), Chicago Greater Rockford Airport (RFD) are other airports near this flight route and their unique identifiers/IATA codes.

Can I find deals for flights from Chicago to Ontario that include extra baggage allowance?

The amount of baggage you can bring on your Chicago to Ontario flight depends on the airline and the type of fare you've chosen. After entering your flight details, you'll be able to view the specific baggage policies for each deal in the search results. Keep in mind that certain deals may offer additional baggage allowance.

Can I find deals on flights from Chicago to Ontario with specific airlines?

Yes, Cheapflights allows you to browse and filter Chicago to Ontario flight deals by airline. After entering your origin and destination, use the available filters to view flights offered by airlines.

Can I find deals for flights from Chicago to Ontario that include hotel bookings?

Yes. In addition to deals on Chicago to Ontario flights, Cheapflights offers vacation packages that include both flights and hotel.

How can I find direct flights from Chicago to Ontario?

After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Chicago to Ontario.

Can I find deals for business class flights from Chicago to Ontario?

Yes. Cheapflights offers flight deals from Chicago to Ontario by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

Can I find deals for flights from Chicago to Ontario that allow pets onboard?

Many airlines flying from Chicago to Ontario offer the option to travel with pets. After selecting a flight deal, you can find more information about the airline's pet policy on their official website or by contacting the airline directly. Please note that additional fees and restrictions may apply.

Can I find deals on last-minute flights from Chicago to Ontario?

Yes, you can often find last-minute deals on Chicago to Ontario flights on Cheapflights. However, these deals can vary and may not always be available. We recommend checking back frequently or signing up for price alerts for the most up-to-date deals.

Flights from Chicago, IL to Ontario, CA from $70

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The best prices from Chicago to Ontario are usually found in May or March, booked 22 days in advance, depart on a Tuesday or Thursday and return on a Wednesday

Cheap flight deals from Chicago to Ontario

Popular in	July
Cheapest in	May
Round-trip from	$238
One-way from	$70

High demand for flights, 17% potential price rise

Search Deals

Best time to find cheap flights, 26% potential price drop

Search Deals

From Chicago (CHI) to Ontario

Search Deals

One-way flight from Chicago (CHI) to Ontario

Search Deals

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

Monday is generally a great day to depart. Flying on this day could help you save up to 36%.

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

Find a great deal and save up to 61% by booking at least 45 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 $323.

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

Due to multiple factors, expect to potentially pay more when booking in March. For low rates, September can be a great choice for travel to Ontario. Flights to Ontario from Chicago in September are about $304 on average during September, but can be found for as low as $64.

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 35% on flights from Chicago to Ontario by exploring options for tickets in the evening.

Cheap Frontier flights from Chicago to Ontario

Find some of the cheapest Frontier flights traveling from Chicago to Ontario. Make sure to double check the flight details before booking.

Sat 5/187:59 pmORD - ONT

1 stop13h 30mFrontier

Thu 5/236:11 pmONT - ORD

1 stop8h 49mFrontier

Deal found 5/9$139

Sat 6/15:56 pmORD - ONT

1 stop8h 03mFrontier

Sat 6/159:15 pmONT - ORD

1 stop6h 19mFrontier

Deal found 5/9$140

Sat 5/185:56 pmORD - ONT

1 stop8h 03mFrontier

Sat 5/255:41 pmONT - ORD

1 stop9h 19mFrontier

Deal found 5/9$141

Sat 5/189:05 pmMDW - ONT

1 stop12h 24mFrontier

Sat 5/2510:10 pmONT - MDW

1 stop5h 40mFrontier

Deal found 5/9$142

Tue 5/218:00 amORD - ONT

1 stop17h 59mFrontier

Wed 5/2911:30 pmONT - ORD

1 stop27h 30mFrontier

Deal found 5/8$143

Tue 5/218:00 amORD - ONT

1 stop17h 59mFrontier

Wed 5/292:35 pmONT - ORD

1 stop8h 38mFrontier

Deal found 5/9$144

Tue 5/217:59 pmORD - ONT

1 stop18h 56mFrontier

Sat 5/255:41 pmONT - ORD

1 stop9h 19mFrontier

Deal found 5/9$145

Tue 8/138:00 amORD - ONT

1 stop6h 32mFrontier

Sun 8/185:30 pmONT - ORD

1 stop9h 17mFrontier

Deal found 5/9$146

Wed 8/147:30 pmORD - ONT

1 stop13h 38mFrontier

Tue 8/2012:49 amONT - ORD

1 stop22h 14mFrontier

Deal found 5/9$147

Cheap American Airlines flights from Chicago to Ontario

Browse through some of the cheapest American Airlines flights traveling from Chicago to Ontario. Check back soon if you're not seeing flights that suit your needs.

Thu 5/235:00 amORD - ONT

1 stop6h 40mAmerican Airlines

Sun 5/2612:53 pmONT - ORD

1 stop9h 22mAmerican Airlines

Deal found 5/9$289

Thu 5/2312:15 pmORD - ONT

1 stop8h 44mAmerican Airlines

Mon 5/2710:29 pmONT - ORD

1 stop8h 27mAmerican Airlines

Deal found 5/9$319

Sun 5/268:15 amORD - ONT

1 stop12h 07mAmerican Airlines

Tue 5/2811:59 pmONT - ORD

1 stop6h 36mAmerican Airlines

Deal found 5/8$343

Mon 5/205:00 amORD - ONT

2 stops8h 47mAmerican Airlines

Thu 5/2312:59 amONT - ORD

1 stop6h 26mAmerican Airlines

Deal found 5/9$763

Sun 5/195:00 pmORD - ONT

1 stop7h 29mAmerican Airlines

Thu 5/3012:53 pmONT - ORD

1 stop6h 04mAmerican Airlines

Deal found 5/9$784

Sat 5/185:00 amORD - ONT

1 stop6h 40mAmerican Airlines

Thu 5/3011:59 pmONT - ORD

1 stop6h 36mAmerican Airlines

Deal found 5/9$787

Sat 5/181:40 pmORD - ONT

1 stop7h 08mAmerican Airlines

Tue 5/2811:59 pmONT - ORD

1 stop6h 36mAmerican Airlines

Deal found 5/9$871

Cheap Chicago to Ontario flights in May & June 2024

Check out some of the best flight deals from Chicago to Ontario in 2024. For more flight deals, be sure to check back very soon.

Sat 5/187:59 pmORD - ONT

1 stop13h 30mFrontier

Thu 5/236:11 pmONT - ORD

1 stop8h 49mFrontier

Deal found 5/9$139

Sat 6/88:35 pmORD - ONT

1 stop12h 28mFrontier

Sat 6/157:15 pmONT - ORD

1 stop8h 19mFrontier

Deal found 5/9$140

Tue 5/219:10 pmMDW - ONT

1 stop13h 54mFrontier

Thu 5/2311:07 pmONT - MDW

1 stop28h 43mFrontier

Deal found 5/10$140

Sat 5/185:56 pmORD - ONT

1 stop8h 03mFrontier

Sat 5/255:41 pmONT - ORD

1 stop9h 19mFrontier

Deal found 5/9$141

Sat 6/17:59 pmORD - ONT

1 stop13h 35mFrontier

Tue 6/1110:31 pmONT - ORD

1 stop28h 54mFrontier

Deal found 5/9$142

Sat 5/189:05 pmMDW - ONT

1 stop12h 24mFrontier

Sat 5/2510:10 pmONT - MDW

1 stop5h 40mFrontier

Deal found 5/9$142

Tue 5/218:00 amORD - ONT

1 stop17h 59mFrontier

Wed 5/2911:30 pmONT - ORD

1 stop27h 30mFrontier

Deal found 5/8$143

Tue 5/212:45 pmMDW - ONT

1 stop11h 14mFrontier

Wed 5/2911:30 pmONT - MDW

1 stop28h 20mFrontier

Deal found 5/10$143

Tue 5/218:00 amORD - ONT

1 stop17h 59mFrontier

Wed 5/292:35 pmONT - ORD

1 stop8h 38mFrontier

Deal found 5/9$144

Chicago to Ontario 2024 flight deals

Check out some of the best flight deals from Chicago to Ontario in 2024. For more flight deals, be sure to check back very soon.

Sat 5/187:59 pmORD - ONT

1 stop13h 30mFrontier

Thu 5/236:11 pmONT - ORD

1 stop8h 49mFrontier

Deal found 5/9$139

Sat 6/88:35 pmORD - ONT

1 stop12h 28mFrontier

Sat 6/157:15 pmONT - ORD

1 stop8h 19mFrontier

Deal found 5/9$140

Tue 5/219:10 pmMDW - ONT

1 stop13h 54mFrontier

Thu 5/2311:07 pmONT - MDW

1 stop28h 43mFrontier

Deal found 5/10$140

Sat 5/185:56 pmORD - ONT

1 stop8h 03mFrontier

Sat 5/255:41 pmONT - ORD

1 stop9h 19mFrontier

Deal found 5/9$141

Sat 6/17:59 pmORD - ONT

1 stop13h 35mFrontier

Tue 6/1110:31 pmONT - ORD

1 stop28h 54mFrontier

Deal found 5/9$142

Sat 5/189:05 pmMDW - ONT

1 stop12h 24mFrontier

Sat 5/2510:10 pmONT - MDW

1 stop5h 40mFrontier

Deal found 5/9$142

Tue 5/218:00 amORD - ONT

1 stop17h 59mFrontier

Wed 5/2911:30 pmONT - ORD

1 stop27h 30mFrontier

Deal found 5/8$143

Tue 8/136:00 amMDW - ONT

1 stop8h 32mFrontier

Sun 8/1812:49 amONT - MDW

1 stop9h 03mFrontier

Deal found 5/9$143

Tue 5/218:00 amORD - ONT

1 stop17h 59mFrontier

Wed 5/292:35 pmONT - ORD

1 stop8h 38mFrontier

Deal found 5/9$144

Non-stop flights to Ontario from Chicago

For a quicker trip, book one of these direct flights from Chicago to Ontario. Users can also choose from other Chicago to Ontario flights by using the search form above.

Sun 6/211:55 amMDW - ONT

Nonstop4h 05mSouthwest

Fri 6/79:55 amONT - MDW

Nonstop3h 45mSouthwest

Deal found 5/9$747

Chicago to Ontario flights leaving soon

Book one of these great deals on flights from Chicago to Ontario. Tip: verify your flight details before completing your reservation.

Sat 5/187:59 pmORD - ONT

1 stop13h 30mFrontier

Thu 5/236:11 pmONT - ORD

1 stop8h 49mFrontier

Deal found 5/9$139

Sat 5/185:56 pmORD - ONT

1 stop8h 03mFrontier

Sat 5/255:41 pmONT - ORD

1 stop9h 19mFrontier

Deal found 5/9$141

Sat 5/189:05 pmMDW - ONT

1 stop12h 24mFrontier

Sat 5/2510:10 pmONT - MDW

1 stop5h 40mFrontier

Deal found 5/9$142

Sat 5/185:56 pmORD - ONT

1 stop8h 03mFrontier

Sat 5/255:41 pmONT - ORD

1 stop9h 19mFrontier

Deal found 5/10$146

Sat 5/189:05 pmMDW - ONT

1 stop12h 24mFrontier

Sat 5/2510:10 pmONT - MDW

1 stop5h 40mFrontier

Deal found 5/8$146

Sat 5/185:56 pmORD - ONT

1 stop8h 03mFrontier

Sat 5/255:41 pmONT - ORD

1 stop9h 19mFrontier

Deal found 5/9$147

Mon 5/209:10 pmMDW - ONT

1 stop13h 54mFrontier

Thu 5/2311:07 pmONT - MDW

1 stop28h 43mFrontier

Deal found 5/9$149

Sat 5/185:56 pmORD - ONT

1 stop8h 03mFrontier

Wed 5/2211:30 pmONT - ORD

1 stop27h 30mFrontier

Deal found 5/9$151

Sat 5/185:05 amMDW - ONT

1 stop20h 54mFrontier

Wed 5/227:45 pmONT - MDW

1 stop8h 05mFrontier

Deal found 5/9$151

One-way flights to Ontario from Chicago

Users in need of a one-way flight from Chicago to Ontario can choose from these deals. Users needing a return flight from Chicago to Ontario should utilize the search form above.

Sat 6/15:56 pmORD - ONT

1 stop8h 03mFrontier

Deal found 5/10$70

Mon 5/209:10 pmMDW - ONT

1 stop13h 54mFrontier

Deal found 5/9$70

Tue 8/138:00 amORD - ONT

1 stop6h 32mFrontier

Deal found 5/9$73

Sat 8/1711:32 amMDW - ONT

1 stop6h 26mFrontier

Deal found 5/9$73

Tue 9/311:32 amMDW - ONT

1 stop7h 18mFrontier

Deal found 5/9$74

Sat 5/185:56 pmORD - ONT

1 stop8h 03mFrontier

Deal found 5/9$75

Sat 5/185:56 pmORD - ONT

1 stop8h 03mFrontier

Deal found 5/9$76

Sat 5/259:05 pmMDW - ONT

1 stop12h 24mFrontier

Deal found 5/9$76

Sat 6/88:35 pmORD - ONT

1 stop12h 28mFrontier

Deal found 5/9$77

Find flights from Chicago to Ontario within your budget

Fly from

Fly to

Budget

$140 - $318

Route

Depart

Return

Price

Chicago O'Hare IntlOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Sat 6/1

1 stop8h 03m

Ontario

Sat 6/15

1 stop6h 19m

$140

Chicago MidwayOntario

MDW - ONT

MDWONT

Chicago Midway

Tue 5/21

1 stop13h 54m

Ontario

Thu 5/23

1 stop28h 43m

$140

Chicago O'Hare IntlOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Tue 5/21

1 stop17h 59m

Ontario

Wed 5/29

1 stop27h 30m

$143

Chicago MidwayOntario

MDW - ONT

MDWONT

Chicago Midway

Tue 8/13

1 stop8h 32m

Ontario

Sun 8/18

1 stop9h 03m

$143

Chicago O'Hare IntlOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Tue 5/21

1 stop17h 59m

Ontario

Wed 5/29

1 stop8h 38m

$144

Chicago MidwayOntario

MDW - ONT

MDWONT

Chicago Midway

Wed 8/28

1 stop6h 26m

Ontario

Mon 9/2

1 stop9h 03m

$144

Chicago O'Hare IntlOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Sat 6/8

2 stops17h 58m

Ontario

Sat 6/15

1 stop6h 19m

$277

Chicago O'Hare IntlOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Thu 5/23

1 stop6h 40m

Ontario

Sun 5/26

1 stop9h 22m

$289

Chicago O'Hare IntlOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Tue 7/23

1 stop10h 05m

Ontario

Sun 7/28

1 stop10h 01m

$318

Flights are sorted by cheapest first

Deals found on 5/9

When is the best time to book a flight from Chicago to Ontario?

Booking 22 days in advance of your planned departure date is, on average, the best time to get cheap flights from Chicago to Ontario. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

Search Deals

When is the cheapest time to fly from Chicago to Ontario?

Morning

Noon

Afternoon

Evening

All times are departure.

Travelers seeking maximum savings on their Chicago to Ontario flight should consider departing on Thursday evenings when fares are most often at their lowest. Sunday at noon flights should be avoided if possible as fares are typically the most expensive at this time.

Search Deals

Average price of flights to Ontario by month

Currently, October is the cheapest month in which you can book a flight from Chicago to Ontario (average of $237). Flying from Chicago to Ontario in June is currently the most expensive (average of $337). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

January

$268

February

$287

March

$281

April

$256

May

$268

June

$337

July

$337

August

$287

September

$258

October

$237

November

$267

December

$272

Temperature and rainfall in Ontario by month

LAX Temperature	57.2 - 73.4 °F

LAX

Temperature

57.2 - 73.4 °F

Reviews of airlines servicing Ontario

Peruse reviews from past customers who have flown with Frontier, American Airlines and Delta from Chicago to Ontario to help guide your decision. In addition to providing an overall rating, users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.

Southwest

8.2

Very good

6,069 reviews

Check prices

Reviews

1 / 10

My original flight was delayed so they found this flight for me so I could arrive at a reasonable time

Southwest

8.2

Very good

6,069 reviews

Southwest

8.2

Very good

6,069 reviews

Check prices

Reviews

1 / 10

My original flight was delayed so they found this flight for me so I could arrive at a reasonable time

Alaska Airlines

8.1

Very good

9,140 reviews

Southwest

8.2

Very good

6,069 reviews

Check prices

Reviews

1 / 10

My original flight was delayed so they found this flight for me so I could arrive at a reasonable time

Delta

8.1

Very good

10,768 reviews

Southwest

8.2

Very good

6,069 reviews

Check prices

Reviews

1 / 10

My original flight was delayed so they found this flight for me so I could arrive at a reasonable time

United Airlines

7.4

Good

11,016 reviews

Southwest

8.2

Very good

6,069 reviews

Check prices

Reviews

1 / 10

My original flight was delayed so they found this flight for me so I could arrive at a reasonable time

American Airlines

7.3

Good

14,641 reviews

Southwest

8.2

Very good

6,069 reviews

Check prices

Reviews

1 / 10

My original flight was delayed so they found this flight for me so I could arrive at a reasonable time

Related info for your journey

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 2 inbound flights from Chicago per day. You should also have plenty of airline options to choose from since 5 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.
Can I find flights from Chicago to Ontario for under $200 on Cheapflights?
Yes, there are multiple flights from Chicago to Ontario for under $200. The cheapest flight booked recently is on Frontier for just $140, but on average you can expect to pay $146.
Are there nonstop flights from Chicago to Ontario for under $800 on Cheapflights?
Cheapflights has at least 1 direct flight from Chicago to Ontario under $800. A good price for a nonstop flight from Chicago to Ontario is less than $747.
Are there last-minute flights available from Chicago to Ontario for under $200?
There are currently 20+ open flights from Chicago to Ontario within the next 7 days for less than $200.
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 $140. Frontier is currently priced 60% below the average price you’ll pay for this route.
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, Delta or Frontier.
What does ORD to ONT mean?
ORD stands for Chicago O'Hare Intl Airport, while ONT stands for Ontario Airport. These codes are often called IATA codes, a set of identifiers established by IATA (International Air Transport Association) that is widely used by airlines and the aviation industry. Chicago Midway Airport (MDW), Chicago Greater Rockford Airport (RFD) are other airports near this flight route and their unique identifiers/IATA codes.
Can I find deals for flights from Chicago to Ontario that include extra baggage allowance?
The amount of baggage you can bring on your Chicago to Ontario flight depends on the airline and the type of fare you've chosen. After entering your flight details, you'll be able to view the specific baggage policies for each deal in the search results. Keep in mind that certain deals may offer additional baggage allowance.
Can I find deals on flights from Chicago to Ontario with specific airlines?
Yes, Cheapflights allows you to browse and filter Chicago to Ontario flight deals by airline. After entering your origin and destination, use the available filters to view flights offered by airlines.
Can I find deals for flights from Chicago to Ontario that include hotel bookings?
Yes. In addition to deals on Chicago to Ontario flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from Chicago to Ontario?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Chicago to Ontario.
Can I find deals for business class flights from Chicago to Ontario?
Yes. Cheapflights offers flight deals from Chicago to Ontario by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.
Can I find deals for flights from Chicago to Ontario that allow pets onboard?
Many airlines flying from Chicago to Ontario offer the option to travel with pets. After selecting a flight deal, you can find more information about the airline's pet policy on their official website or by contacting the airline directly. Please note that additional fees and restrictions may apply.
Can I find deals on last-minute flights from Chicago to Ontario?
Yes, you can often find last-minute deals on Chicago to Ontario flights on Cheapflights. However, these deals can vary and may not always be available. We recommend checking back frequently or signing up for price alerts for the most up-to-date deals.
How recently were the Chicago to Ontario flight deals updated?
The Chicago to Ontario flight deals you see on this page were last updated on 5/10.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

Alternative routes for Chicago to Ontario
See prices for flight routes from nearby airports that may be better suited for you.

O'Hare Intl to Los Angeles flights

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Midway to Los Angeles flights

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Midway to San Diego flights

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Midway to San Jose flights

St. Louis to Ontario flights

St. Louis to San Diego flights

Midway to Palm Springs flights

Midway to Sacramento flights

Midway to Reno flights

St. Louis to Santa Ana flights

St. Louis to Sacramento flights

O'Hare Intl to Santa Barbara flights

O'Hare Intl to Long Beach flights

Midway to Oakland flights

St. Louis to Oakland flights

Midway to Fresno flights

Moline to Los Angeles flights

St. Louis to San Jose flights

Moline to Palm Springs flights

Bloomington to San Francisco flights

St. Louis to Long Beach flights

St. Louis to Palm Springs flights

Midway to Burbank flights

St. Louis to Fresno flights

St. Louis to Burbank flights

O'Hare Intl to San Luis Obispo flights

Moline to San Diego flights

Bloomington to San Jose flights

Moline to Ontario flights

O'Hare Intl to Tijuana flights

O'Hare Intl to Santa Rosa flights

St. Louis to Reno flights

Moline to San Francisco flights

O'Hare Intl to Monterey flights

Complete your trip
Complete your trip to Ontario by adding a car rental and/or hotel reservation to your travel itinerary.

Ontario car rentals

Los Angeles Airport car rentals

Ontario Airport car rentals

Burbank Bob Hope Airport car rentals

Long Beach Municipal Airport car rentals

Los Angeles car rentals

San Francisco car rentals

San Diego car rentals

Sacramento car rentals

San Jose car rentals

Fresno car rentals

Burbank car rentals

Other flights to Ontario
Explore flights to Ontario departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on May 10, 2024.

Top 5 airlines flying from Chicago to Ontario

Airline	Cheapest	Average	Flexibility	On-time
Frontier	Cheapest$120	Average$213	FlexibilityNo cancel fee	On-time62%	Search Frontier flights
Spirit Airlines	Cheapest$126	Average$249	FlexibilityNo cancel fee	On-time65%	Search Spirit Airlines flights
Delta	Cheapest$276	Average$396	FlexibilityNo cancel fee	On-timeN/A	Search Delta flights
United Airlines	Cheapest$311	Average$454	FlexibilityNo cancel fee	On-time69%	Search United Airlines flights
American Airlines	Cheapest$311	Average$388	FlexibilityNo cancel fee	On-time71%	Search American Airlines flights

Cancún to Mexico City flights

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Austin to Dallas flights

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Orlando to London flights

Houston to Atlanta flights

Phoenix to Chicago flights

Chicago to Los Angeles flights

Boston to Iceland flights

Newark Airport to Phoenix flights

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Search flights from Chicago to Ontario by cabin class

Hourly flight availability from Chicago to Ontario

0%of flight departures	Early morningMidnight to 6 am
100%of flight departures	Morning6 am to noon
0%of flight departures	AfternoonNoon to 6 pm
0%of flight departures	Evening6 pm to midnight

Midnight

6 AM

Noon

6 PM

Weekly flight availability from Chicago to Ontario

Sunday	1daily flight
Monday	3daily flights
Tuesday	3daily flights
Wednesday	3daily flights
Thursday	3daily flights
Friday	3daily flights
Saturday	3daily flights

Book a flight to one of these trending destinations

Fly with Cheapflights

How does Cheapflights help users find flights from Chicago to Ontario?

Deals for Chicago to Ontario flights are sourced from 900+ travel sites when you use Cheapflights. When all flight results come back, Cheapflights lets you sort and filter flights using different criteria to choose better, like price, airport, cabin class, and plenty of other options.

Why should you use Cheapflights to find cheap flight tickets from Chicago to Ontario?

It’s simple! Cheapflights, which is free to use for everyone, saves millions of users time and money every year by helping them find the cheapest and most suitable flights from Chicago to Ontario.

Can Cheapflights find flights from Chicago to Ontario with no change fees?

Yes, we can. To see specific flights from Chicago to Ontario with no change fees, users can toggle flexible booking options after using the search form above to find flights.

Can Cheapflights notify me if prices for flights from Chicago to Ontario become cheaper?

Not ready to book yet? You can track prices for flights from Chicago to Ontario on Cheapflights with our Price Alert feature and get notified when better prices are available.

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Cheap flights from Chicago (CHI) to Ontario (ONT) from $70

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 6/1. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.

The best prices from Chicago to Ontario are usually found in May or March, booked 22 days in advance, depart on a Tuesday or Thursday and return on a Wednesday

Cheap flight deals from Chicago to Ontario

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

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

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

Cheap Frontier flights from Chicago to Ontario

Find some of the cheapest Frontier flights traveling from Chicago to Ontario. Make sure to double check the flight details before booking.

Cheap American Airlines flights from Chicago to Ontario

Browse through some of the cheapest American Airlines flights traveling from Chicago to Ontario. Check back soon if you're not seeing flights that suit your needs.

Cheap Chicago to Ontario flights in May & June 2024

Find cheap flight options from Chicago to Ontario specifically for the months of May and June 2024. Explore affordable fares based on user searches. Over the last 7 days, Cheapflights users made 2,717,708 searches. Prices were last updated on May 10, 2024.

Check out some of the best flight deals from Chicago to Ontario in 2024. For more flight deals, be sure to check back very soon.

Chicago to Ontario 2024 flight deals

Discover exclusive flight deals for travel between Chicago and Ontario in 2024. Find excellent offers based on user searches. Over the last 7 days, Cheapflights users made 2,717,708 searches. Data last updated May 10, 2024.

Check out some of the best flight deals from Chicago to Ontario in 2024. For more flight deals, be sure to check back very soon.

Non-stop flights to Ontario from Chicago

For a quicker trip, book one of these direct flights from Chicago to Ontario. Users can also choose from other Chicago to Ontario flights by using the search form above.

Chicago to Ontario flights leaving soon

Book one of these great deals on flights from Chicago to Ontario. Tip: verify your flight details before completing your reservation.

One-way flights to Ontario from Chicago

Users in need of a one-way flight from Chicago to Ontario can choose from these deals. Users needing a return flight from Chicago to Ontario should utilize the search form above.

Find flights from Chicago to Ontario within your budget

When is the best time to book a flight from Chicago to Ontario?

Use this chart to determine the optimal time to book a round-trip flight from Chicago to Ontario. Price data was last updated on May 3, 2024.

Booking 22 days in advance of your planned departure date is, on average, the best time to get cheap flights from Chicago to Ontario. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

When is the cheapest time to fly from Chicago to Ontario?

Use this chart to determine the cheapest time to fly round-trip from Chicago to Ontario. Price data was last updated on May 5, 2024.

Average price of flights to Ontario by month

Plan your trip from Chicago to Ontario by taking into account the cheapest months to travel. The average price of a one-way flight from Chicago to Ontario is currently $74 while a round-trip flight costs $193. Price data was last updated on May 5, 2024.

Temperature and rainfall in Ontario by month

Plan your trip to Ontario by taking into account the average temperature and rainfall totals by month.

Reviews of airlines servicing Ontario

Related info for your journey

Find useful and relevant information for your journey from Chicago to Ontario. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

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

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

Are there nonstop flights from Chicago to Ontario for under $800 on Cheapflights?

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

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

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

What does ORD to ONT mean?

Can I find deals for flights from Chicago to Ontario that include extra baggage allowance?

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How can I find direct flights from Chicago to Ontario?

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Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for Chicago to OntarioSee prices for flight routes from nearby airports that may be better suited for you.

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

Top 5 airlines flying from Chicago to Ontario

Popular flight searches

Check out other popular destinations found by fellow travelers in 2024

Search flights from Chicago to Ontario by cabin class

Find flights from Chicago to Ontario, based on your preferred cabin class, be it economy, premium economy, business, or first class.

Hourly flight availability from Chicago to Ontario

Find hourly flight availability from Chicago to Ontario. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated May 10, 2024.

Weekly flight availability from Chicago to Ontario

Explore weekly flight availability from Chicago to Ontario. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated May 10, 2024.

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User searches for flights to these destinations increased 20% or more in the past 90 days compared to other destinations

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How does Cheapflights help users find flights from Chicago to Ontario?

Why should you use Cheapflights to find cheap flight tickets from Chicago to Ontario?

Can Cheapflights find flights from Chicago to Ontario with no change fees?

Can Cheapflights notify me if prices for flights from Chicago to Ontario become cheaper?

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Alternative routes for Chicago to Ontario
See prices for flight routes from nearby airports that may be better suited for you.