Cheap flights from Chicago (CHI) to Ontario (ONT) from $63

This is the cheapest one-way flight price, found on 11/25. Prices may vary by date and flight preferences.
CHI — ONT
Dec 2 — Dec 91

The best prices from Chicago to Ontario are usually found in November or May, booked 78 days in advance, depart on a Thursday or Tuesday and return on a Friday

Flights from Ontario to Chicago

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

Discover tips and strategies to find the most affordable flight options for your journey from Chicago (CHI) to Ontario (ONT). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated November 27, 2023.

Popular in

March

Cheapest in

November

Round-trip from

$217

One-way from

$139
High demand for flights, 37% potential price rise
Best time to find cheap flights, 34% potential price drop
From Chicago (CHI) to Ontario
One-way flight from Chicago (CHI) to Ontario

CHI - LAX

Price

$217 - $470

LAX

Temperature

57.2 - 73.4 °F

LAX

Rainfall

0 - 3.4 inches

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

Wednesday is generally a great day to depart. Flying on this day could help you save up to 53%.

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

Find a great deal and save up to 54% by booking at least 49 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 $277.

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

Due to multiple factors, expect to potentially pay more when booking in June. For low rates, January can be a great choice for travel to Ontario. Flights to Ontario from Chicago in January are about $296 on average during January, but can be found for as low as $90.

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 47% on flights from Chicago to Ontario by exploring options for tickets in the evening.

Cheap Frontier flights from Chicago to Ontario

Explore cheap flight options specifically provided by Frontier for the route between Chicago and Ontario. Find affordable fares and compare prices with other airlines to secure the best deal for your journey. Over the last 7 days, Cheapflights users made 2,764,469 searches. Data last updated November 27, 2023.
Find some of the cheapest Frontier flights traveling from Chicago to Ontario. Make sure to double check the flight details before booking.

Cheap Delta flights from Chicago to Ontario

Explore cheap flight options specifically provided by Delta for the route between Chicago and Ontario. Find affordable fares and compare prices with other airlines to secure the best deal for your journey. Over the last 7 days, Cheapflights users made 2,764,469 searches. Data last updated November 27, 2023.
Browse through some of the cheapest Delta 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 November & December 2023

Find cheap flight options from Chicago to Ontario specifically for the months of November and December 2023. Explore affordable fares based on user searches. Over the last 7 days, Cheapflights users made 2,764,469 searches. Prices were last updated on November 27, 2023.
Check out some of the best flight deals from Chicago to Ontario in 2023. For more flight deals, be sure to check back very soon.

Chicago to Ontario 2023 flight deals

Discover exclusive flight deals for travel between Chicago and Ontario in 2023. Find excellent offers based on user searches. Over the last 7 days, Cheapflights users made 2,764,469 searches. Data last updated November 27, 2023.
Check out some of the best flight deals from Chicago to Ontario in 2023. For more flight deals, be sure to check back very soon.

Chicago to Ontario flights leaving soon

Find last-minute flight options from Chicago to Ontario for spontaneous travel. Discover available flights and compare prices based on user searches. Secure great deals and offers for spontaneous trips with quick booking options. Over the last 7 days, Cheapflights users made 2,764,469 searches. Data last updated November 27, 2023.
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

Search for one-way flight options from Chicago to Ontario. Find affordable one-way fares based on user searches. Compare prices and availability to plan your one-way journey according to your preferred dates and budget. Over the last 7 days, Cheapflights users made 2,764,469 searches. Data last updated November 27, 2023.
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

Customize your flight search to find flights from Chicago to Ontario that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,764,469 searches. Data last updated November 27, 2023.

Fly from

Any airport

Fly to

Any airport

Budget

$118 - $337

Route

Depart

Return

Price

Chicago MidwayOntario

MDW - ONT

MDWONT

Chicago Midway

Fri 12/8

1 stop14h 56m

Ontario

Mon 12/11

1 stop9h 39m

Chicago MidwayOntario

MDW - ONT

MDWONT

Chicago Midway

Sun 1/14

1 stop11h 40m

Ontario

Tue 1/23

1 stop14h 40m

Chicago MidwayOntario

MDW - ONT

MDWONT

Chicago Midway

Sun 1/14

2 stops14h 00m

Ontario

Tue 1/23

1 stop14h 40m

Chicago MidwayOntario

MDW - ONT

MDWONT

Chicago Midway

Thu 2/1

1 stop16h 20m

Ontario

Mon 2/5

1 stop11h 18m

Chicago MidwayOntario

MDW - ONT

MDWONT

Chicago Midway

Thu 1/18

1 stop6h 22m

Ontario

Sun 1/21

1 stop10h 42m

Chicago O'Hare IntlOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Sat 12/16

1 stop10h 46m

Ontario

Thu 1/4

1 stop21h 53m

Chicago O'Hare IntlOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Wed 1/24

1 stop7h 55m

Ontario

Sun 1/28

1 stop8h 11m

Chicago O'Hare IntlOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Tue 1/23

1 stop7h 03m

Ontario

Tue 1/30

2 stops14h 04m

Chicago O'Hare IntlOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Fri 12/8

1 stop10h 37m

Ontario

Mon 12/11

1 stop10h 48m

Flights are sorted by cheapest first

Deals found on 11/26

Reviews of airlines servicing Ontario

Get insights into the airlines that provide service to Ontario. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Ontario. Reviews last updated November 27, 2023.
Peruse reviews from past customers who have flown with Frontier, Delta and United Airlines 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.
8.0
Very good
1,399 reviews

Boarding

8.3

Comfort

8.0

Crew

8.6

Food

7.2

Overall

8.0

Entertainment

7.2

Reviews

1 / 10

The seats are not very comfortable but the crew was nice!

8.0
Very good
1,399 reviews
8.0
Very good
1,399 reviews

Boarding

8.3

Comfort

8.0

Crew

8.6

Food

7.2

Overall

8.0

Entertainment

7.2

Reviews

1 / 10

The seats are not very comfortable but the crew was nice!

7.9
Good
3,033 reviews
8.0
Very good
1,399 reviews

Boarding

8.3

Comfort

8.0

Crew

8.6

Food

7.2

Overall

8.0

Entertainment

7.2

Reviews

1 / 10

The seats are not very comfortable but the crew was nice!

7.4
Good
94 reviews
8.0
Very good
1,399 reviews

Boarding

8.3

Comfort

8.0

Crew

8.6

Food

7.2

Overall

8.0

Entertainment

7.2

Reviews

1 / 10

The seats are not very comfortable but the crew was nice!

7.4
Good
1,897 reviews
8.0
Very good
1,399 reviews

Boarding

8.3

Comfort

8.0

Crew

8.6

Food

7.2

Overall

8.0

Entertainment

7.2

Reviews

1 / 10

The seats are not very comfortable but the crew was nice!

7.2
Good
2,645 reviews
8.0
Very good
1,399 reviews

Boarding

8.3

Comfort

8.0

Crew

8.6

Food

7.2

Overall

8.0

Entertainment

7.2

Reviews

1 / 10

The seats are not very comfortable but the crew was nice!

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?

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 $118, but on average you can expect to pay $162.

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 $118. Frontier is currently priced 62% below the average price you’ll pay for this route.

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

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.

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Top 5 airlines flying from Chicago to Ontario

Discover the top 5 airlines that operate flights from Chicago to Ontario. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,764,469 searches. Data last updated November 27, 2023.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$109Average$234FlexibilityNo cancel feeOn-time62%
Search Frontier flights
Spirit AirlinesCheapest$142Average$259FlexibilityNo cancel feeOn-time65%
Search Spirit Airlines flights
United AirlinesCheapest$308Average$483FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
American AirlinesCheapest$331Average$471FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
DeltaCheapest$332Average$467FlexibilityNo cancel feeOn-timeN/A
Search Delta flights

Search flights to Ontario by cabin 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 November 27, 2023.
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 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 November 27, 2023.
Sunday1daily flight
Monday3daily flights
Tuesday3daily flights
Wednesday3daily flights
Thursday3daily flights
Friday3daily flights
Saturday3daily flights

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travelers can enjoy low prices and a wide availability of flights to their desired destinations.

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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