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Cheap flights from Ontario (ONT) to Illinois 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 10/4. 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.
ONT — ORD
jun. 12 — jun. 191
From?
To?
mié. 6/12
mié. 6/19
1 adult, Economy
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How far in advance should I book a flight from Ontario to Illinois?

To save up to 71% on this flight, we recommend booking at least 60 days prior to travel. The price may fluctuate and will likely increase closer to your departure date. Users on Cheapflights have found tickets from Ontario to Illinois from $319 1-2 weeks out and tickets from $507 for flights departing within the next 72 hours.

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

Our data shows that January tends to be the cheapest month to fly to Illinois from Ontario. Users have commonly found prices around $313 for the month, but tickets can be as low as $135. Due to multiple factors, prepare for potentially higher prices in March.

What is the cheapest time of day to fly from ONT to IL?

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Ontario to Illinois as you normally would.

Cheap Ontario to Illinois flights in June & July 2024

Find cheap flight options from Ontario to Illinois specifically for the months of June and July 2024. Explore affordable fares based on user searches. Over the last 7 days, Cheapflights users made 3,048,502 searches. Prices were last updated on junio 7, 2024.
The lowest fares we've come across on flights traveling from Ontario to Illinois in June and July 2024. Check back regularly for other flight deals.
lun. 6/1012:59 amONT - MDW
1 stop10h 10mFrontier
sáb. 6/158:50 pmMDW - ONT
1 stop12h 13mFrontier
Deal found 6/5$150
lun. 6/1012:59 amONT - ORD
1 stop21h 41mFrontier
sáb. 6/158:35 pmORD - ONT
1 stop12h 28mFrontier
Deal found 6/5$150
lun. 6/1712:59 amONT - STL
1 stop11h 48mFrontier
mar. 6/253:47 pmSTL - ONT
1 stop17h 15mFrontier
Deal found 6/7$156
lun. 7/2212:49 amONT - MDW
1 stop14h 21mFrontier
mié. 7/3112:23 pmMDW - ONT
1 stop5h 42mFrontier
Deal found 6/5$156
vie. 6/1412:44 amONT - STL
1 stop6h 45mFrontier
lun. 7/812:23 pmSTL - ONT
1 stop7h 10mFrontier
Deal found 6/6$159
mar. 7/165:16 pmONT - ORD
1 stop10h 15mFrontier
mar. 8/137:15 pmORD - ONT
1 stop12h 52mFrontier
Deal found 6/6$159
jue. 6/2011:59 amONT - STL
1 stop19h 41mFrontier
vie. 6/285:36 pmSTL - ONT
1 stop5h 47mFrontier
Deal found 6/6$161
jue. 7/251:35 pmONT - MDW
1 stop13h 10mFrontier
mié. 7/3112:23 pmMDW - ONT
1 stop5h 42mFrontier
Deal found 6/6$161
vie. 7/1212:39 amONT - MDW
1 stop10h 24mFrontier
mié. 7/1712:23 pmMDW - ONT
1 stop5h 42mFrontier
Deal found 6/6$162

Ontario to Illinois 2024 flight deals

Discover exclusive flight deals for travel between Ontario and Illinois in 2024. Find excellent offers based on user searches. Over the last 7 days, Cheapflights users made 3,048,502 searches. Data last updated junio 7, 2024.
The lowest fares we've come across on flights traveling from Ontario to Illinois in June and July 2024. Check back regularly for other flight deals.
mar. 8/2012:49 amONT - STL
1 stop6h 48mFrontier
sáb. 8/318:00 pmSTL - ONT
1 stop5h 44mFrontier
Deal found 6/6$136
mar. 8/1312:00 pmONT - MDW
1 stop16h 33mFrontier
mié. 8/2110:00 pmMDW - ONT
1 stop13h 06mFrontier
Deal found 6/4$136
mar. 8/1312:00 pmONT - ORD
1 stop14h 47mFrontier
lun. 8/197:30 pmORD - ONT
1 stop15h 36mFrontier
Deal found 6/6$136
mar. 8/2012:49 amONT - STL
1 stop6h 48mFrontier
mié. 8/288:00 pmSTL - ONT
1 stop5h 39mFrontier
Deal found 6/6$137
mar. 8/2012:49 amONT - MDW
1 stop9h 03mFrontier
mar. 8/2710:00 pmMDW - ONT
1 stop17h 22mFrontier
Deal found 6/5$137
mié. 8/218:35 pmONT - ORD
1 stop6h 12mFrontier
mar. 8/277:30 pmORD - ONT
1 stop24h 39mFrontier
Deal found 6/5$137
mié. 8/1412:49 amONT - STL
1 stop12h 04mFrontier
lun. 8/197:29 pmSTL - ONT
1 stop24h 40mFrontier
Deal found 6/6$138
jue. 9/191:10 pmONT - MDW
1 stop15h 23mFrontier
lun. 9/2310:00 pmMDW - ONT
1 stop22h 09mFrontier
Deal found 6/5$138
mar. 8/1312:49 amONT - ORD
1 stop22h 14mFrontier
lun. 8/196:48 pmORD - ONT
1 stop19h 44mFrontier
Deal found 6/5$138

Ontario to Illinois flights leaving soon

Find last-minute flight options from Ontario to Illinois 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 3,048,502 searches. Data last updated junio 7, 2024.
Users seeking a last-minute flight from Ontario to Illinois should consider booking one of these fares. It's wise to confirm all flight details are correct before booking.
lun. 6/1712:59 amONT - STL
1 stop11h 48mFrontier
mar. 6/253:47 pmSTL - ONT
1 stop17h 15mFrontier
Deal found 6/7$156
vie. 6/1412:44 amONT - STL
1 stop6h 45mFrontier
lun. 7/812:23 pmSTL - ONT
1 stop7h 10mFrontier
Deal found 6/6$159
vie. 6/1412:44 amONT - STL
1 stop6h 45mFrontier
jue. 6/207:29 pmSTL - ONT
1 stop23h 39mFrontier
Deal found 6/6$169
vie. 6/1412:44 amONT - STL
1 stop6h 45mFrontier
sáb. 7/138:02 pmSTL - ONT
1 stop5h 54mFrontier
Deal found 6/6$170
jue. 6/1310:29 pmONT - STL
1 stop11h 25mFrontier
jue. 6/207:29 pmSTL - ONT
1 stop15h 35mFrontier
Deal found 6/7$176
jue. 6/1310:29 pmONT - STL
1 stop11h 25mFrontier
sáb. 6/157:29 pmSTL - ONT
1 stop13h 34mFrontier
Deal found 6/6$186
lun. 6/1712:59 amONT - STL
1 stop11h 48mFrontier
mié. 7/1012:23 pmSTL - ONT
1 stop20h 40mFrontier
Deal found 6/6$187
lun. 6/1712:59 amONT - STL
1 stop11h 48mFrontier
lun. 7/812:23 pmSTL - ONT
1 stop7h 10mFrontier
Deal found 6/6$189
vie. 6/144:14 pmONT - MDW
1 stop28h 44mFrontier
sáb. 6/294:58 pmMDW - ONT
1 stop7h 16mFrontier
Deal found 6/6$198

One-way flights to Illinois from Ontario

Search for one-way flight options from Ontario to Illinois. 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 3,048,502 searches. Data last updated junio 7, 2024.
Take a look at some of the one-way flights we've detected from Ontario to Illinois. For those needing a return trip from Ontario, there is a search form available above.
vie. 10/412:49 amONT - STL
1 stop6h 48mFrontier
Deal found 6/5$70
vie. 8/168:35 pmONT - MDW
1 stop7h 58mFrontier
Deal found 6/6$70
mié. 8/148:35 pmONT - ORD
1 stop6h 12mFrontier
Deal found 6/6$70
mié. 8/218:35 pmONT - ORD
1 stop6h 12mFrontier
Deal found 6/6$72
mar. 8/138:35 pmONT - MDW
1 stop7h 58mFrontier
Deal found 6/6$74
mar. 8/138:35 pmONT - ORD
1 stop6h 12mFrontier
Deal found 6/6$74
mié. 9/118:35 pmONT - ORD
1 stop6h 12mFrontier
Deal found 6/7$75
jue. 9/59:36 pmONT - STL
1 stop10h 42mFrontier
Deal found 6/6$76
lun. 9/212:49 amONT - MDW
1 stop9h 03mFrontier
Deal found 6/6$76

Find flights from Ontario to Illinois within your budget

Customize your flight search to find flights from Ontario to Illinois 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 3,048,502 searches. Data last updated junio 7, 2024.

Fly from

Any airport

Fly to

Any airport

Budget

$136 - $367

Route

Depart

Return

Price

OntarioLambert-St Louis

ONT - STL

ONTSTL

Ontario

mar. 8/20

1 stop6h 48m

Lambert-St Louis

sáb. 8/31

1 stop5h 44m

$136

OntarioChicago Midway

ONT - MDW

ONTMDW

Ontario

mar. 8/13

1 stop9h 03m

Chicago Midway

mar. 8/27

1 stop7h 18m

$136

OntarioChicago O'Hare Intl

ONT - ORD

ONTORD

Ontario

mar. 8/13

1 stop14h 47m

Chicago O'Hare Intl

lun. 8/19

1 stop15h 36m

$136

OntarioLambert-St Louis

ONT - STL

ONTSTL

Ontario

mar. 8/20

1 stop6h 48m

Lambert-St Louis

mié. 8/28

1 stop5h 39m

$137

OntarioChicago Midway

ONT - MDW

ONTMDW

Ontario

sáb. 8/17

1 stop6h 56m

Chicago Midway

vie. 8/23

1 stop13h 06m

$137

OntarioChicago O'Hare Intl

ONT - ORD

ONTORD

Ontario

lun. 9/30

1 stop10h 31m

Chicago O'Hare Intl

mar. 11/5

1 stop7h 07m

$236

OntarioChicago O'Hare Intl

ONT - ORD

ONTORD

Ontario

vie. 6/28

1 stop7h 58m

Chicago O'Hare Intl

vie. 7/5

1 stop5h 24m

$260

OntarioLambert-St Louis

ONT - STL

ONTSTL

Ontario

jue. 7/18

2 stops11h 34m

Lambert-St Louis

sáb. 7/20

1 stop5h 54m

$343

OntarioMoline Quad-City

ONT - MLI

ONTMLI

Ontario

sáb. 8/24

1 stop5h 36m

Moline Quad-City

sáb. 8/31

1 stop5h 37m

$367

Flights are sorted by cheapest first

Deals found on 6/6

No data available for this route at this time. Please check back soon.

Best time to book a flight from Ontario to Illinois

Have a flexible travel schedule? Discover the best time to fly to Illinois from Ontario with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Reviews of airlines servicing Illinois

Get insights into the airlines that provide service to Illinois. 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 Illinois. Reviews last updated junio 7, 2024.
Get a feel of what it's like to fly with Alaska Airlines, American Airlines and Delta from Ontario to Illinois by reading reviews from past customers. 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
5,911 reviews

Comfort

8.1

Food

7.3

Crew

8.7

Entertainment

7.8

Overall

8.2

Boarding

8.3

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
5,911 reviews
Southwest
8.2
Very good
5,911 reviews

Comfort

8.1

Food

7.3

Crew

8.7

Entertainment

7.8

Overall

8.2

Boarding

8.3

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
9,223 reviews
Southwest
8.2
Very good
5,911 reviews

Comfort

8.1

Food

7.3

Crew

8.7

Entertainment

7.8

Overall

8.2

Boarding

8.3

Reviews

1 / 10

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

Delta
8.0
Very good
10,363 reviews
Southwest
8.2
Very good
5,911 reviews

Comfort

8.1

Food

7.3

Crew

8.7

Entertainment

7.8

Overall

8.2

Boarding

8.3

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
10,696 reviews
Southwest
8.2
Very good
5,911 reviews

Comfort

8.1

Food

7.3

Crew

8.7

Entertainment

7.8

Overall

8.2

Boarding

8.3

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
14,226 reviews
Southwest
8.2
Very good
5,911 reviews

Comfort

8.1

Food

7.3

Crew

8.7

Entertainment

7.8

Overall

8.2

Boarding

8.3

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

Find useful and relevant information for your journey from Ontario to Illinois. 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 from for flights from Ontario to Illinois?

    Ontario (ONT), located 3.1 mi from the city center, is the airport you fly out of when you book flights from Ontario to Illinois.

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

    Yes, there are multiple flights from Ontario to Illinois for under $200. The cheapest flight booked recently is on Frontier for just $136, but on average you can expect to pay $140.

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

    Cheapflights has at least 2 direct flights from Ontario to Illinois under $800. A good price for a nonstop flight from Ontario to Illinois is less than $785.

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

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

  • What are the most popular routes from Ontario to Illinois?

    The most popular flight routes from Ontario to Illinois are Ontario - Chicago O'Hare Intl, Ontario - Chicago Midway and Ontario - Lambert-St Louis.

  • What does ONT to ORD mean?

    ONT and ORD are unique codes to identify airports used in the aviation industry. They are defined by IATA (International Air Transport Association) and are commonly called IATA codes. ONT to ORD refers to a flight route from Ontario Airport to Chicago O'Hare Intl Airport. Chicago Midway Airport (MDW), Moline Quad-City Airport (MLI), Greater Peoria Airport (PIA), Bloomington-Normal Airport (BMI), Springfield Capital Airport (SPI) are other airports near this flight route and their unique identifiers/IATA codes.

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

    The amount of baggage you can bring on your Ontario to Illinois 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 Ontario to Illinois with specific airlines?

    Yes, Cheapflights allows you to browse and filter Ontario to Illinois 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 Ontario to Illinois that include hotel bookings?

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

  • How can I find direct flights from Ontario to Illinois?

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

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

    Yes. Cheapflights offers flight deals from Ontario to Illinois 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 Ontario to Illinois that allow pets onboard?

    Many airlines flying from Ontario to Illinois 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 Ontario to Illinois?

    Yes, you can often find last-minute deals on Ontario to Illinois 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 Ontario to Illinois flight deals updated?

    The Ontario to Illinois flight deals you see on this page were last updated on 6/6.

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

    Consider American Airlines, Delta or Frontier when booking your flight. These represent the most popular airlines when flying from Ontario to Illinois.

  • What is the cheapest month to book a flight from Ontario to Illinois?

    Currently, February is the cheapest month in which you can book a flight from Ontario to Illinois (average of $244). Flying from Ontario to Illinois in July is currently the most expensive (average of $324). 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.

See more FAQs

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

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Top 5 airlines flying from Ontario to Illinois

Discover the top 5 airlines that operate flights from Ontario to Illinois. 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 3,048,502 searches. Data last updated junio 7, 2024.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$93Average$253FlexibilityNo cancel feeOn-time65%
FrontierCheapest$124Average$226FlexibilityNo cancel feeOn-time62%
United AirlinesCheapest$268Average$509FlexibilityNo cancel feeOn-time69%
DeltaCheapest$276Average$412FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$290Average$622FlexibilityNo cancel feeOn-time71%
Boston to Cancún flights
Dallas to San Antonio flights
Reno to Las Vegas flights
Houston to Boston flights
San Francisco to Las Vegas flights
Newark Airport to Fort Lauderdale flights
Los Angeles to Dubai flights
USA to Hyderabad flights
Boston to Phoenix flights
Phoenix to Las Vegas flights
Houston to Paris flights
Ontario to Indiana flights

Search flights from Ontario to Illinois by cabin class

Find flights from Ontario to Illinois, based on your preferred cabin class, be it economy, premium economy, business, or first class.
First Class
Business Class
Prem Econ Class
Economy Class

Hourly flight availability from Ontario to Illinois

Find hourly flight availability from Ontario to Illinois. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated junio 7, 2024.
80%of flight departuresEarly morningMidnight to 6 am
20%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

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