HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news

Cheap flights from Ontario (ONT) to Illinois from $63

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 6/4. 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 2 — Jun 91
From?
To?
Sun 6/2
Sun 6/9
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

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.

When is the cheapest time to fly from Ontario to Illinois (ONT - 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 Frontier flights from Ontario to Illinois

Explore cheap flight options specifically provided by Frontier for the route between Ontario and Illinois. 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 2,740,132 searches. Data last updated May 28, 2024.
Check out some of the cheapest Frontier flights we've come across from Ontario to Illinois. Come back soon if you're not finding the exact deal you're looking for.
Tue 6/412:59 amONT - STL
1 stop6h 30mFrontier
Wed 6/128:02 pmSTL - ONT
1 stop5h 47mFrontier
Deal found 5/27$138
Mon 6/39:57 pmONT - STL
1 stop10h 16mFrontier
Mon 6/108:22 pmSTL - ONT
1 stop5h 37mFrontier
Deal found 5/27$139
Fri 6/78:50 pmONT - STL
1 stop11h 52mFrontier
Tue 6/113:47 pmSTL - ONT
1 stop10h 12mFrontier
Deal found 5/27$140
Tue 8/2012:49 amONT - STL
1 stop6h 48mFrontier
Sat 8/247:29 pmSTL - ONT
1 stop13h 39mFrontier
Deal found 5/27$141
Tue 6/42:25 pmONT - STL
1 stop17h 04mFrontier
Fri 6/710:59 pmSTL - ONT
1 stop10h 31mFrontier
Deal found 5/27$142
Fri 6/710:23 pmONT - STL
1 stop9h 06mFrontier
Sun 6/97:29 pmSTL - ONT
1 stop24h 40mFrontier
Deal found 5/28$143
Thu 6/67:33 pmONT - STL
2 stops24h 26mFrontier
Tue 6/117:29 pmSTL - ONT
1 stop24h 19mFrontier
Deal found 5/27$145
Fri 6/710:23 pmONT - STL
1 stop9h 06mFrontier
Tue 6/113:47 pmSTL - ONT
1 stop10h 12mFrontier
Deal found 5/28$150
Tue 8/208:35 pmONT - ORD
1 stop6h 12mFrontier
Tue 8/277:15 pmORD - ONT
1 stop12h 52mFrontier
Deal found 5/27$154

Cheap Delta flights from Ontario to Illinois

Explore cheap flight options specifically provided by Delta for the route between Ontario and Illinois. 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 2,740,132 searches. Data last updated May 28, 2024.
Take a gander at the lowest prices we've found on Delta flights from Ontario to Illinois. Deals are refreshing constantly so come back soon for more options.
Mon 6/32:13 pmONT - ORD
1 stop7h 53mDelta
Tue 6/117:45 amORD - ONT
1 stop6h 32mDelta
Deal found 5/26$279
Mon 7/152:04 pmONT - ORD
1 stop7h 52mDelta
Wed 7/247:00 amORD - ONT
1 stop8h 24mDelta
Deal found 5/27$287
Wed 6/56:42 pmONT - ORD
2 stops11h 57mDelta
Sat 8/101:31 pmORD - ONT
2 stops12h 28mDelta
Deal found 5/27$289
Sat 7/1311:23 amONT - MDW
1 stop8h 23mDelta
Tue 7/239:18 amMDW - ONT
2 stops8h 59mDelta
Deal found 5/27$292
Thu 8/15:00 pmONT - ORD
2 stops12h 30mDelta
Mon 8/55:15 pmORD - ONT
2 stops8h 44mDelta
Deal found 5/27$297
Sat 8/311:21 pmONT - ORD
1 stop6h 09mDelta
Tue 9/33:50 pmORD - ONT
2 stops10h 09mDelta
Deal found 5/28$327
Sat 8/315:00 pmONT - ORD
2 stops13h 13mDelta
Tue 9/33:50 pmORD - ONT
2 stops10h 09mDelta
Deal found 5/28$332
Fri 6/76:30 pmONT - MDW
2 stops12h 18mDelta
Sat 6/83:45 pmMDW - ONT
1 stop9h 15mDelta
Deal found 5/28$335
Fri 8/211:23 amONT - ORD
1 stop10h 31mDelta
Fri 8/163:50 pmORD - ONT
2 stops10h 09mDelta
Deal found 5/27$337

Cheap Ontario to Illinois flights in May & June 2024

Find cheap flight options from Ontario to Illinois specifically for the months of May and June 2024. Explore affordable fares based on user searches. Over the last 7 days, Cheapflights users made 2,740,132 searches. Prices were last updated on May 28, 2024.
The lowest fares we've come across on flights traveling from Ontario to Illinois in May and June 2024. Check back regularly for other flight deals.
Wed 5/2912:59 amONT - STL
1 stop19h 07mFrontier
Sat 6/18:04 pmSTL - ONT
1 stop5h 55mFrontier
Deal found 5/27$136
Fri 5/3112:59 amONT - STL
1 stop6h 26mFrontier
Sat 6/88:02 pmSTL - ONT
1 stop5h 55mFrontier
Deal found 5/28$137
Tue 6/412:59 amONT - STL
1 stop6h 30mFrontier
Wed 6/128:02 pmSTL - ONT
1 stop5h 47mFrontier
Deal found 5/27$138
Sat 6/110:10 pmONT - STL
1 stop10h 03mFrontier
Sat 6/88:02 pmSTL - ONT
1 stop5h 55mFrontier
Deal found 5/28$139
Mon 6/312:59 amONT - STL
1 stop10h 10mFrontier
Fri 6/710:59 pmSTL - ONT
1 stop10h 31mFrontier
Deal found 5/27$140
Fri 5/3112:59 amONT - STL
1 stop6h 26mFrontier
Wed 6/58:02 pmSTL - ONT
1 stop16h 57mFrontier
Deal found 5/27$141
Tue 6/42:25 pmONT - STL
1 stop17h 04mFrontier
Fri 6/710:59 pmSTL - ONT
1 stop10h 31mFrontier
Deal found 5/27$142
Fri 6/710:23 pmONT - STL
1 stop9h 06mFrontier
Sun 6/97:29 pmSTL - ONT
1 stop24h 40mFrontier
Deal found 5/28$143
Thu 6/67:33 pmONT - STL
2 stops24h 26mFrontier
Tue 6/117:29 pmSTL - ONT
1 stop24h 19mFrontier
Deal found 5/27$145

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 2,740,132 searches. Data last updated May 28, 2024.
The lowest fares we've come across on flights traveling from Ontario to Illinois in May and June 2024. Check back regularly for other flight deals.
Wed 5/2912:59 amONT - STL
1 stop19h 07mFrontier
Sat 6/18:04 pmSTL - ONT
1 stop5h 55mFrontier
Deal found 5/27$136
Fri 5/3112:59 amONT - STL
1 stop6h 26mFrontier
Sat 6/88:02 pmSTL - ONT
1 stop5h 55mFrontier
Deal found 5/28$137
Tue 6/412:59 amONT - STL
1 stop6h 30mFrontier
Wed 6/128:02 pmSTL - ONT
1 stop5h 47mFrontier
Deal found 5/27$138
Sat 6/110:10 pmONT - STL
1 stop10h 03mFrontier
Sat 6/88:02 pmSTL - ONT
1 stop5h 55mFrontier
Deal found 5/28$139
Tue 8/2012:49 amONT - STL
1 stop6h 48mFrontier
Sat 8/248:00 pmSTL - ONT
1 stop5h 44mFrontier
Deal found 5/28$140
Fri 5/3112:59 amONT - STL
1 stop6h 26mFrontier
Wed 6/58:02 pmSTL - ONT
1 stop16h 57mFrontier
Deal found 5/27$141
Tue 6/42:25 pmONT - STL
1 stop17h 04mFrontier
Fri 6/710:59 pmSTL - ONT
1 stop10h 31mFrontier
Deal found 5/27$142
Fri 6/710:23 pmONT - STL
1 stop9h 06mFrontier
Sun 6/97:29 pmSTL - ONT
1 stop24h 40mFrontier
Deal found 5/28$143
Thu 6/67:33 pmONT - STL
2 stops24h 26mFrontier
Tue 6/117:29 pmSTL - ONT
1 stop24h 19mFrontier
Deal found 5/27$145

Non-stop flights to Illinois from Ontario

Discover non-stop flight options from Ontario to Illinois. Find direct flights with no layovers, providing a convenient travel experience. Explore non-stop flight options based on user searches, and compare prices and availability for your desired travel dates. Over the last 7 days, Cheapflights users made 2,740,132 searches. Data last updated May 28, 2024.
For a shorter flight, select one of these non-stop flights from Ontario to Illinois. Select from other flights from Ontario to Illinois by using the search form above.
Mon 6/109:55 amONT - MDW
Nonstop3h 45mSouthwest
Fri 6/142:05 pmMDW - ONT
Nonstop4h 05mSouthwest
Deal found 5/26$648

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 2,740,132 searches. Data last updated May 28, 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.
Tue 6/412:59 amONT - STL
1 stop6h 30mFrontier
Wed 6/128:02 pmSTL - ONT
1 stop5h 47mFrontier
Deal found 5/27$138
Mon 6/39:57 pmONT - STL
1 stop10h 16mFrontier
Mon 6/108:22 pmSTL - ONT
1 stop5h 37mFrontier
Deal found 5/27$139
Mon 6/312:59 amONT - STL
1 stop10h 10mFrontier
Fri 6/710:59 pmSTL - ONT
1 stop10h 31mFrontier
Deal found 5/27$140
Tue 6/42:25 pmONT - STL
1 stop17h 04mFrontier
Fri 6/710:59 pmSTL - ONT
1 stop10h 31mFrontier
Deal found 5/27$142
Fri 6/710:23 pmONT - STL
1 stop9h 06mFrontier
Sun 6/97:29 pmSTL - ONT
1 stop24h 40mFrontier
Deal found 5/28$143
Thu 6/67:33 pmONT - STL
2 stops24h 26mFrontier
Tue 6/117:29 pmSTL - ONT
1 stop24h 19mFrontier
Deal found 5/27$145
Fri 6/710:23 pmONT - STL
1 stop9h 06mFrontier
Tue 6/113:47 pmSTL - ONT
1 stop10h 12mFrontier
Deal found 5/28$150
Sun 6/211:30 pmONT - STL
1 stop8h 43mFrontier
Tue 7/23:47 pmSTL - ONT
1 stop10h 12mFrontier
Deal found 5/26$178
Wed 6/512:49 amONT - STL
1 stop11h 43mFrontier
Tue 6/113:47 pmSTL - ONT
1 stop10h 12mFrontier
Deal found 5/27$185

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 2,740,132 searches. Data last updated May 28, 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.
Tue 6/412:59 amONT - MDW
1 stop9h 01mFrontier
Deal found 5/28$63
Fri 8/2312:49 amONT - STL
1 stop6h 48mFrontier
Deal found 5/28$74
Wed 7/178:17 amONT - ORD
1 stop13h 21mFrontier
Deal found 5/28$74
Fri 8/3012:49 amONT - STL
1 stop6h 48mFrontier
Deal found 5/26$75
Wed 6/1212:49 amONT - STL
1 stop11h 43mFrontier
Deal found 5/27$76
Fri 6/710:23 pmONT - STL
1 stop9h 06mFrontier
Deal found 5/27$77
Tue 8/208:35 pmONT - MDW
1 stop7h 58mFrontier
Deal found 5/27$78
Tue 8/138:35 pmONT - ORD
1 stop6h 12mFrontier
Deal found 5/27$78
Tue 8/1312:49 amONT - MDW
1 stop9h 03mFrontier
Deal found 5/28$79

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 2,740,132 searches. Data last updated May 28, 2024.

Fly from

Any airport

Fly to

Any airport

Budget

$140 - $431

Route

Depart

Return

Price

OntarioLambert-St Louis

ONT - STL

ONTSTL

Ontario

Fri 6/7

1 stop11h 52m

Lambert-St Louis

Tue 6/11

1 stop10h 12m

$140

OntarioLambert-St Louis

ONT - STL

ONTSTL

Ontario

Tue 8/20

1 stop6h 48m

Lambert-St Louis

Sat 8/24

1 stop13h 39m

$141

OntarioLambert-St Louis

ONT - STL

ONTSTL

Ontario

Fri 6/7

1 stop9h 06m

Lambert-St Louis

Tue 6/11

1 stop10h 12m

$150

OntarioChicago Midway

ONT - MDW

ONTMDW

Ontario

Tue 8/20

1 stop7h 58m

Chicago Midway

Tue 8/27

1 stop7h 18m

$154

OntarioChicago O'Hare Intl

ONT - ORD

ONTORD

Ontario

Tue 8/20

1 stop6h 12m

Chicago O'Hare Intl

Tue 8/27

1 stop12h 52m

$154

OntarioChicago O'Hare Intl

ONT - ORD

ONTORD

Ontario

Mon 7/15

1 stop7h 52m

Chicago O'Hare Intl

Wed 7/24

1 stop8h 24m

$287

OntarioChicago O'Hare Intl

ONT - ORD

ONTORD

Ontario

Thu 8/1

1 stop8h 12m

Chicago O'Hare Intl

Mon 8/5

1 stop13h 43m

$326

OntarioLambert-St Louis

ONT - STL

ONTSTL

Ontario

Wed 7/3

1 stop5h 14m

Lambert-St Louis

Sat 7/6

2 stops10h 03m

$409

OntarioMoline Quad-City

ONT - MLI

ONTMLI

Ontario

Sat 7/13

2 stops13h 45m

Moline Quad-City

Sat 11/16

1 stop5h 48m

$431

Flights are sorted by cheapest first

Deals found on 5/27

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 May 28, 2024.
Get a feel of what it's like to fly with Frontier, Delta and American Airlines 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.
Alaska Airlines
8.1
Very good
9,194 reviews
Check prices

Food

7.3

Crew

8.6

Boarding

8.2

Comfort

7.9

Entertainment

7.3

Overall

8.1

Reviews

1 / 10

Paid a lot for our exit row seats and they weren’t that roomy.

Alaska Airlines
8.1
Very good
9,194 reviews
Alaska Airlines
8.1
Very good
9,194 reviews
Check prices

Food

7.3

Crew

8.6

Boarding

8.2

Comfort

7.9

Entertainment

7.3

Overall

8.1

Reviews

1 / 10

Paid a lot for our exit row seats and they weren’t that roomy.

Delta
8.0
Very good
10,476 reviews
Alaska Airlines
8.1
Very good
9,194 reviews
Check prices

Food

7.3

Crew

8.6

Boarding

8.2

Comfort

7.9

Entertainment

7.3

Overall

8.1

Reviews

1 / 10

Paid a lot for our exit row seats and they weren’t that roomy.

Avianca
7.5
Good
3,661 reviews
Alaska Airlines
8.1
Very good
9,194 reviews
Check prices

Food

7.3

Crew

8.6

Boarding

8.2

Comfort

7.9

Entertainment

7.3

Overall

8.1

Reviews

1 / 10

Paid a lot for our exit row seats and they weren’t that roomy.

United Airlines
7.4
Good
10,799 reviews
Alaska Airlines
8.1
Very good
9,194 reviews
Check prices

Food

7.3

Crew

8.6

Boarding

8.2

Comfort

7.9

Entertainment

7.3

Overall

8.1

Reviews

1 / 10

Paid a lot for our exit row seats and they weren’t that roomy.

American Airlines
7.3
Good
14,316 reviews
Alaska Airlines
8.1
Very good
9,194 reviews
Check prices

Food

7.3

Crew

8.6

Boarding

8.2

Comfort

7.9

Entertainment

7.3

Overall

8.1

Reviews

1 / 10

Paid a lot for our exit row seats and they weren’t that roomy.

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 $140, but on average you can expect to pay $159.

  • Are there nonstop flights from Ontario to Illinois for under $700 on Cheapflights?

    Cheapflights has at least 1 direct flight from Ontario to Illinois under $700. A good price for a nonstop flight from Ontario to Illinois is less than $648.

  • 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 5/28.

  • 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.

  • When is the best time 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 June is currently the most expensive (average of $326). 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

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.

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

Los Angeles to John F Kennedy Intl flights
Los Angeles to Newark flights
San Francisco to John F Kennedy Intl flights
Los Angeles to Seattle flights
Los Angeles to Honolulu flights
San Francisco to Newark flights
Los Angeles to Boston flights
Los Angeles to O'Hare Intl flights
Los Angeles to Miami flights
Los Angeles to LaGuardia flights
Los Angeles to Dallas/Fort Worth flights
Los Angeles to Las Vegas flights
Los Angeles to Orlando flights
San Francisco to LaGuardia flights
Santa Ana to Seattle flights
San Francisco to Seattle flights
Ontario to Seattle flights
San Francisco to Honolulu flights
San Francisco to Las Vegas flights
San Francisco to Los Angeles flights
Los Angeles to San Francisco flights
San Francisco to O'Hare Intl flights
Ontario to John F Kennedy Intl flights
Los Angeles to Fort Lauderdale flights
Los Angeles to Portland flights
Los Angeles to Hobby flights
Los Angeles to Atlanta flights
Burbank to Seattle flights
San Jose to Seattle flights
Burbank to Newark flights
San Francisco to Boston flights
Oakland to Los Angeles flights
San Diego to Seattle flights
Los Angeles to Reagan-National flights
Los Angeles to George Bush Intcntl flights
Burbank to Las Vegas flights
San Francisco to Dallas/Fort Worth flights
Oakland to Newark flights
Oakland to Las Vegas flights
Los Angeles to Midway flights
Los Angeles to Oakland flights
Santa Ana to Las Vegas flights
Los Angeles to Nashville flights
Ontario to Dallas/Fort Worth flights
Los Angeles to Dulles Intl flights
San Diego to John F Kennedy Intl flights
Los Angeles to Lihue flights
Los Angeles to Denver flights
Los Angeles to Kahului flights
Los Angeles to Philadelphia flights

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 2,740,132 searches. Data last updated May 28, 2024.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$105Average$257FlexibilityNo cancel feeOn-time65%
Search Spirit Airlines flights
FrontierCheapest$123Average$227FlexibilityNo cancel feeOn-time62%
Search Frontier flights
DeltaCheapest$276Average$412FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
American AirlinesCheapest$292Average$618FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
United AirlinesCheapest$299Average$520FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
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 May 28, 2024.
26%of flight departuresEarly morningMidnight to 6 am
62%of flight departuresMorning6 am to noon
12%of flight departuresAfternoonNoon to 6 pm
0%of flight departuresEvening6 pm to midnight
Midnight
6 AM
Noon
6 PM

Book a flight to one of these trending destinations

User searches for flights to these destinations increased 20% or more in the past 90 days compared to other destinations
Flights to Laayoune Hassan I
Flights to Virac
Flights to Figari-Sud Corse
Flights to Edremit/Korfez
Flights to Rhinelander Oneida County
Flights to Girona Costa Brava
Flights to Brainerd Crow Wing County
Flights to Parikia Paros
Flights to Cortez Montezuma County
Flights to Miyakojima Hirara
Flights to Zadar
Flights to Trapani Birgi
Flights to Provincetown
Flights to Oran Es Senia
Flights to Constanţa Mihail Kogalniceanu
Flights to Vava'u Lupepau'U
Flights to Urumqi
Flights to Hakodate
Flights to Naxos
Flights to Dalaman
Flights to Hyannis Barnstable
Flights to Devils Lake
Flights to Bastia Poretta
Flights to Karpathos

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 Ontario to Illinois?

Cheapflights goes through 900+ travel sites to look for the best flight deals for flights from Ontario to Illinois. Too many options? Cheapflights also provides filters for things like airlines, price ranges, and number of stops to help you make a decision easily.

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

Millions of users choose and trust Cheapflights to book the best flight deals from Ontario to Illinois for free. We help you search and compare prices from hundreds of airlines for the right flight just for you.

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

Yes! Cheapflights helps users easily find flights from Ontario to Illinois with no change fees.

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

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

100% Free
Cheapflights is completely free to use, so you can start saving the moment you arrive.
Book with Flexibility
Our users can plan ahead with confidence and find flights with no change fees
Travel Smart
Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.
View all available airlines