What airlines fly to Chicago?

American Airlines, United Airlines and Spirit Airlines are the top three most popular airlines that fly to Chicago from Ontario according to our data. American Airlines is the first choice among our users, with 43% of people opting to fly with this airline when traveling to Chicago. Keep in mind that there are 8 different airlines that fly to Chicago on a routine basis, so you have a few additional options to choose from.

How many flights depart from Ontario to Chicago on average per week?

The number of flights available between Ontario and Chicago is 10 per week as of October 2025. The most frequent departure day is Mon, with 20% of weekly flights leaving on this day.

How many flights depart from Ontario to Chicago on average per day?

As of October 2025, 1 flights take off from Ontario and land in Chicago each day. The most common flight departure time for this route is 7:00AM, with 100% of daily flights taking off at noon.

Which layover airport offers the lowest fares from Ontario to Chicago?

Flights via Salt Lake City (SLC) offer the lowest average round-trip price of $256.

Which layover airport has the shortest connection time from Ontario to Chicago?

Salt Lake City (SLC) has the shortest average layover time for this route: 1h 04m.

Which layover airport has the shortest travel time from Ontario to Chicago?

Flights connecting via Salt Lake City (SLC) have the shortest average one-way travel time: 5h 52m.

What is the cheapest airline that flies from Ontario to Chicago?

Frontier is the most popular carrier operating from Ontario to Chicago

Which airport is the most popular layover for flights between Ontario and Chicago?

Denver (DEN) was the most common stop: 62% of momondo users choosing 1-stop flights on this route connected there.

When did momondo last update prices for flights from Ontario Airport to Chicago?

Prices for flights from Ontario Airport to Chicago were last updated today.

How many operators does momondo search for flights from Ontario Airport to Chicago?

As of October 2025, there are 5 operators available to choose from for flights from Ontario Airport to Chicago.

How old do you have to be to fly from Ontario Airport to Chicago?

Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Ontario Airport to Chicago.

What documentation or ID do you need to fly to Chicago?

The travel and health documents required for your trip to Chicago can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Chicago. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

$68 Cheap Flights from Ontario to Chicago in 2025/26

1 adult

0 bags

Discover deals from 900+ travel sites with momondo.

Save money when you book flights with momondo

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize your results.

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Not ready to book? to track prices.

Search flight deals

Find the cheapest flights from Ontario to Chicago

Round-trip

One-way

Last minute

Direct

Cheap round-trip flights

Enter your travel dates to find the best prices.

1:46 pm - 11:44 pmONT-ORD

7h 58m1 stop

6:05 pm - 9:27 pmORD-ONT

29h 22m1 stop

$161Frontier

Find Deal

Fri, Oct 31 - Tue, Nov 4

6:53 am - 12:15 amONT-ORD

15h 22m1 stop

6:05 pm - 11:10 amORD-ONT

19h 05m1 stop

$162Frontier

Find Deal

Thu, Nov 6 - Wed, Nov 12

1:46 pm - 12:12 amONT-ORD

8h 26m1 stop

6:05 pm - 11:10 amORD-ONT

19h 05m1 stop

$165Frontier

Find Deal

Thu, Oct 30 - Wed, Nov 5

8:00 am - 5:32 amONT-ORD

19h 32m1 stop

6:05 pm - 11:11 amORD-ONT

19h 06m1 stop

$166Multiple Airlines

Find Deal

Wed, Nov 12 - Wed, Nov 19

7:44 pm - 11:00 pmONT-ORD

25h 16m2 stops

10:43 pm - 12:37 pmORD-ONT

15h 54m1 stop

$167Multiple Airlines

Find Deal

Sun, Nov 9 - Fri, Nov 14

6:53 am - 10:50 pmONT-ORD

13h 57m1 stop

5:50 pm - 11:50 pmORD-ONT

32h 00m2 stops

$169Frontier

Find Deal

Wed, Oct 29 - Fri, Oct 31

10:43 pm - 3:39 pmONT-ORD

38h 56m2 stops

10:43 pm - 12:37 pmORD-ONT

15h 54m1 stop

$170Frontier

Find Deal

Sun, Nov 9 - Fri, Nov 14

8:45 am - 11:30 amONT-MDW

24h 45m1 stop

1:37 pm - 11:50 pmMDW-ONT

12h 13m2 stops

$171Frontier

Find Deal

Wed, Nov 12 - Sat, Nov 15

8:00 am - 5:32 amONT-ORD

19h 32m1 stop

7:15 am - 11:50 pmORD-ONT

18h 35m1 stop

$171Multiple Airlines

Find Deal

Wed, Nov 12 - Sat, Nov 15

7:44 pm - 5:32 amONT-ORD

7h 48m1 stop

6:05 pm - 11:10 amORD-ONT

19h 05m1 stop

$172Multiple Airlines

Find Deal

Sun, Nov 2 - Wed, Nov 5

Frontier flights from Ontario to Chicago

Our best Frontier deals on Ontario to Chicago flight tickets

Frontier

Oct 31

ONT1:46 pmOntario

7h 58m

1 stop

ORD11:44 pmChicago O'Hare Intl

Nov 4

ORD6:05 pmChicago O'Hare Intl

29h 22m

1 stop

ONT9:27 pmOntario

$161

Find similar

Frontier

Nov 6

ONT6:53 amOntario

15h 22m

1 stop

ORD12:15 amChicago O'Hare Intl

Nov 12

ORD6:05 pmChicago O'Hare Intl

19h 05m

1 stop

ONT11:10 amOntario

$162

Find similar

Frontier

Oct 30

ONT1:46 pmOntario

8h 26m

1 stop

ORD12:12 amChicago O'Hare Intl

Nov 5

ORD6:05 pmChicago O'Hare Intl

19h 05m

1 stop

ONT11:10 amOntario

$165

Find similar

Southwest flights from Ontario to Chicago

Our best Southwest deals on Ontario to Chicago flight tickets

Southwest

Oct 29

ONT8:10 amOntario

3h 50m

MDW2:00 pmChicago Midway

Oct 31

MDW8:45 amChicago Midway

4h 15m

ONT11:00 amOntario

$579

Find similar

Southwest

Oct 29

ONT4:25 pmOntario

5h 40m

1 stop

MDW12:05 amChicago Midway

Oct 31

MDW8:45 amChicago Midway

4h 15m

ONT11:00 amOntario

$589

Find similar

Southwest

Oct 29

ONT8:40 amOntario

9h 00m

2 stops

MDW7:40 pmChicago Midway

Oct 31

MDW8:45 amChicago Midway

4h 15m

ONT11:00 amOntario

$594

Find similar

Fly from

Fly to

Route

Depart

Return

Price

OntarioChicago

ONT - ORD

ONTORD

Ontario

Fri 10/31

1:46 pm-11:44 pm

1 stop7h 58m

Chicago O'Hare Intl

Tue 11/4

6:05 pm-9:27 pm

1 stop29h 22m

$161

OntarioChicago

ONT - ORD

ONTORD

Ontario

Thu 11/6

6:53 am-12:15 am

1 stop15h 22m

Chicago O'Hare Intl

Wed 11/12

6:05 pm-11:10 am

1 stop19h 05m

$162

OntarioChicago

ONT - ORD

ONTORD

Ontario

Thu 10/30

1:46 pm-12:12 am

1 stop8h 26m

Chicago O'Hare Intl

Wed 11/5

6:05 pm-11:10 am

1 stop19h 05m

$165

OntarioChicago

ONT - ORD

ONTORD

Ontario

Wed 11/12

8:00 am-5:32 am

1 stop19h 32m

Chicago O'Hare Intl

Wed 11/19

6:05 pm-11:11 am

1 stop19h 06m

$166

OntarioChicago

ONT - ORD

ONTORD

Ontario

Sun 11/9

7:44 pm-11:00 pm

2 stops25h 16m

Chicago O'Hare Intl

Fri 11/14

10:43 pm-12:37 pm

1 stop15h 54m

$167

OntarioChicago

ONT - ORD

ONTORD

Ontario

Wed 10/29

6:53 am-10:50 pm

1 stop13h 57m

Chicago O'Hare Intl

Fri 10/31

5:50 pm-11:50 pm

2 stops32h 00m

$169

OntarioChicago

ONT - ORD

ONTORD

Ontario

Sun 11/9

10:43 pm-3:39 pm

2 stops38h 56m

Chicago O'Hare Intl

Fri 11/14

10:43 pm-12:37 pm

1 stop15h 54m

$170

OntarioChicago

ONT - MDW

ONTMDW

Ontario

Wed 11/12

8:45 am-11:30 am

1 stop24h 45m

Chicago Midway

Sat 11/15

1:37 pm-11:50 pm

2 stops12h 13m

$171

OntarioChicago

ONT - ORD

ONTORD

Ontario

Wed 11/12

8:00 am-5:32 am

1 stop19h 32m

Chicago O'Hare Intl

Sat 11/15

7:15 am-11:50 pm

1 stop18h 35m

$171

OntarioChicago

ONT - ORD

ONTORD

Ontario

Sun 11/2

7:44 pm-5:32 am

1 stop7h 48m

Chicago O'Hare Intl

Wed 11/5

6:05 pm-11:10 am

1 stop19h 05m

$172

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

How to get the cheapest flight ticket from Ontario to Chicago

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

Prices

Airlines

Layovers

Other information

What is the cheapest month to fly to Chicago?

The month of November is, on average, the cheapest month to fly to Chicago from Ontario, with most prices found around $268. If you’re not able to fly to Chicago in November, then June is your next best option. Flight prices from Ontario to Chicago during June average around $317.

What is the cheapest day to depart on your flight to Chicago?

The cheapest day to depart on your flight to Chicago is on a Thursday when prices can be found for as low as $359. This is often the case because there is less demand to fly during this day of the week. When flying out on a Sunday, the most expensive travel day of the week, you can expect to see flight prices from Ontario to Chicago for around $452.

What is the cheapest time of day to depart on your flight to Chicago?

Our most recent data shows that the best time of day to fly to Chicago is in the afternoon. Flights from Ontario to Chicago during this time can be as low as $280. In contrast, the most expensive time of day to depart to Chicago is at noon when prices are around $456.

What is the cheapest Ontario to Chicago flight route?

Fly from Ontario to Chicago Midway for the best Ontario - Chicago flight prices

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

You are more likely to see cheaper flights to Chicago from Ontario when booking weeks ahead of your departure date. In general, you can expect to find flights to Chicago for around $392 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Chicago from Ontario for as low as $283 on momondo.

What cabin class options are available on Ontario to Chicago flights?

There are 4 cabin classes available to choose from on Ontario to Chicago flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Can stopping save me money on Ontario to Chicago flights?

You could potentially save up to 20% on your flight if you consider stops on a Ontario to Chicago flight.

How have Ontario to Chicago flight prices changed over time?

As of October 2025, prices for Ontario to Chicago flights are approximately 20% more expensive when compared to flights at the same time last year.

When to book flights from Ontario to Chicago

Are you open to changing your travel dates? Check out the ideal times to fly from Ontario to Chicago according to our flight data. Find out which month and days have the cheapest flights.

Estimated round-trip price

Cheap Ontario to Chicago (ONT to CHI) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Ontario to Chicago

Best Price Found	$188
Fastest flight time	3h 45m
Direct flights	Every day
Airports in Chicago	2 airports

The best one-way flight to Chicago from Ontario in the past 72 hours is $188. The best round-trip flight deal from Ontario to Chicago found on momondo in the last 72 hours is $362.

The fastest flight from Ontario to Chicago takes 3h 45m

Direct flights go from Ontario to Chicago every day.

There are 2 airports near Chicago: Chicago O'Hare Intl (ORD), Chicago Midway (MDW)

Search flight deals

How far is Ontario to Chicago by plane?
The straight-line distance from Ontario to Chicago is 1710.7 mi. 6h 11m is a normal flight duration for this route.
When did momondo last update prices for flights from Ontario Airport to Chicago?
Prices for flights from Ontario Airport to Chicago were last updated today.
How many operators does momondo search for flights from Ontario Airport to Chicago?
As of October 2025, there are 5 operators available to choose from for flights from Ontario Airport to Chicago.
How old do you have to be to fly from Ontario Airport to Chicago?
Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Ontario Airport to Chicago.
What documentation or ID do you need to fly to Chicago?
The travel and health documents required for your trip to Chicago can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Chicago. We always recommend checking with your airline or a trusted third party such as IATA to get advice.
What is the most popular plane model from Ontario to Chicago?
Based on momondo bookings for flights between Ontario and Chicago, the leading plane model is Boeing 737-800, making up 18.22% of the total bookings. Other popular models include Airbus A321neo with 14.60%, Airbus A318/A319/A320/A321 with 8.56%, and Airbus A320 (sharklets) with 7.57%.
What is the most popular airline from Ontario to Chicago?
Based on momondo bookings for flights between Ontario and Chicago, the leading airline is Southwest, making up 35% of the total bookings. Other popular airlines include United Airlines with 32%, Frontier with 19%, and American Airlines with 9%.

Best airlines flying from Ontario to Chicago

Compare and see reviews for airlines that fly from Ontario to Chicago with momondo

Airline	Rating	Free Cancellation	Price
Frontier	PriceFrom $110	Free Cancellation	Rating 5.8 3,137 reviews	Search Frontier flights
United Airlines	PriceFrom $227	Free Cancellation	Rating 7.4 8,982 reviews	Search United Airlines flights
Southwest	PriceFrom $237	Free Cancellation	Rating 8.0 4,241 reviews	Search Southwest flights
American Airlines	PriceFrom $246	Free Cancellation	Rating 7.2 11,043 reviews	Search American Airlines flights
Delta	PriceFrom $256	Free Cancellation	Rating 7.9 7,984 reviews	Search Delta flights

Southwest Flights From Ontario to Chicago
Southwest flight deals from Ontario to Chicago start from $237 round-trip. Over the 5 Southwest flights for this route in a normal week, average airfare is usually $434 round-trip - but some users have found much cheaper deals with momondo.
United Airlines Flights From Ontario to Chicago
The best United Airlines deal for Ontario to Chicago flight tickets found on momondo in the last 72 hours was $227, round-trip. It should be noted that an average United Airlines flight deal for this route in this time was higher, at $394 round-trip. United Airlines operates 5 flights out of Ontario into Chicago in an average week, so prices vary by time and availability. 8,982 United Airlines reviews by users on momondo have scored the airline at 7.4/10.

Merrillville

New Buffalo

Hammond

Benton Harbor

Saint Joseph

Portage

Lansing

Schererville

Valparaiso

Crown Point

Munster

Chesterton

Monticello

Porter

Griffith

Saint John

Why use momondo?

Why should I use momondo to find a flight deal from Ontario to Chicago?

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from Ontario to Chicago. momondo saves you time and could save you money on your trip.

Can I find flights from Ontario to Chicago with flexible booking policies on momondo?

Yes. All flights to Chicago from Ontario on momondo can be compared and filtered by various policies on offer, including flexible booking.

How can momondo help me find flights from Ontario to Chicago?

Once you have performed a search for Ontario to Chicago flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.

I’m not ready to book a flight from Ontario to Chicago right now. Can momondo alert me if prices change?

Of course. momondo tracks the price of Ontario to Chicago flights. All you need is a valid email address and we will do the rest; it is that quick and easy.

An easier way to manage your Chicago trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

Start using Trips

Find my bookings

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

1 adult

Sat 11/15

Sat 11/22

Email me momondo's favorite deals

By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to the United States

Fly into one of these airports located in Chicago

Chicago Midway Airport

Chicago O'Hare Intl Airport

Chicago Greater Rockford Airport

Popular cities in the United States

Flights to New Yorkfrom $48

Flights to Los Angelesfrom $48

Flights to Miamifrom $53

Flights to Orlandofrom $54

Flights to Las Vegasfrom $38

Flights to San Franciscofrom $48

Flights to Washington, D.C.from $50

Flights to Bostonfrom $55

Flights to Atlantafrom $45

Flights to Dallasfrom $63

Flights to Seattlefrom $71

Flights to Denverfrom $54

Cheap flights from Ontario to Chicago from $68

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Ontario to Chicago departing on 11/15. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

Big names and deals

Big names and deals

Filter for what you want

Filter for what you want

Trusted and free

Trusted and free

Price Alerts

Price Alerts

Find the cheapest flights from Ontario to Chicago

Cheap round-trip flights

Cheap one-way flights

Cheap last minute flights

Cheap direct flights

Frontier flights from Ontario to Chicago

Our best Frontier deals on Ontario to Chicago flight tickets

Southwest flights from Ontario to Chicago

Our best Southwest deals on Ontario to Chicago flight tickets

momondo Fare Finder

Use the filters below to find and compare flights from Ontario to Chicago that are best for you.

See travel insights to Chicago from

How to get the cheapest flight ticket from Ontario to Chicago

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest month to fly to Chicago?

The month of November is, on average, the cheapest month to fly to Chicago from Ontario, with most prices found around $268. If you’re not able to fly to Chicago in November, then June is your next best option. Flight prices from Ontario to Chicago during June average around $317.

What is the cheapest day to depart on your flight to Chicago?

What is the cheapest time of day to depart on your flight to Chicago?

Our most recent data shows that the best time of day to fly to Chicago is in the afternoon. Flights from Ontario to Chicago during this time can be as low as $280. In contrast, the most expensive time of day to depart to Chicago is at noon when prices are around $456.

What is the cheapest Ontario to Chicago flight route?

Fly from Ontario to Chicago Midway for the best Ontario - Chicago flight prices

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

What cabin class options are available on Ontario to Chicago flights?

There are 4 cabin classes available to choose from on Ontario to Chicago flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Can stopping save me money on Ontario to Chicago flights?

You could potentially save up to 20% on your flight if you consider stops on a Ontario to Chicago flight.

How have Ontario to Chicago flight prices changed over time?

As of October 2025, prices for Ontario to Chicago flights are approximately 20% more expensive when compared to flights at the same time last year.

What is the cheapest airline that flies from Ontario to Chicago?

Frontier is the most popular carrier operating from Ontario to Chicago

What airlines fly to Chicago?

Which airport is the most popular layover for flights between Ontario and Chicago?

Denver (DEN) was the most common stop: 62% of momondo users choosing 1-stop flights on this route connected there.

Which layover airport offers the lowest fares from Ontario to Chicago?

Flights via Salt Lake City (SLC) offer the lowest average round-trip price of $256.

Which layover airport has the shortest travel time from Ontario to Chicago?

Flights connecting via Salt Lake City (SLC) have the shortest average one-way travel time: 5h 52m.

Which layover airport has the shortest connection time from Ontario to Chicago?

Salt Lake City (SLC) has the shortest average layover time for this route: 1h 04m.

How many flights depart from Ontario to Chicago on average per day?

As of October 2025, 1 flights take off from Ontario and land in Chicago each day. The most common flight departure time for this route is 7:00AM, with 100% of daily flights taking off at noon.

How many flights depart from Ontario to Chicago on average per week?

The number of flights available between Ontario and Chicago is 10 per week as of October 2025. The most frequent departure day is Mon, with 20% of weekly flights leaving on this day.

When to book flights from Ontario to Chicago

Cheap Ontario to Chicago (ONT to CHI) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Ontario to Chicago

Best Price Found

Fastest flight time

Direct flights

Airports in Chicago

How far is Ontario to Chicago by plane?

When did momondo last update prices for flights from Ontario Airport to Chicago?

How many operators does momondo search for flights from Ontario Airport to Chicago?

How old do you have to be to fly from Ontario Airport to Chicago?

What documentation or ID do you need to fly to Chicago?

What is the most popular plane model from Ontario to Chicago?

What is the most popular airline from Ontario to Chicago?

Best airlines flying from Ontario to Chicago

Compare and see reviews for airlines that fly from Ontario to Chicago with momondo

Southwest Flights From Ontario to Chicago

United Airlines Flights From Ontario to Chicago

Traveling to a place near Chicago?

Why use momondo?

Why should I use momondo to find a flight deal from Ontario to Chicago?

Can I find flights from Ontario to Chicago with flexible booking policies on momondo?

How can momondo help me find flights from Ontario to Chicago?

I’m not ready to book a flight from Ontario to Chicago right now. Can momondo alert me if prices change?

An easier way to manage your Chicago trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

Get notified when prices go down