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

Phoenix (PHX) was the most common stop: 33% of momondo users choosing 1-stop flights on this route connected there.

What airlines fly to Ontario?

American Airlines, United Airlines and Frontier are the top three most popular airlines that fly to Ontario from Chicago according to our data. American Airlines is the first choice among our users, with 41% of people opting to fly with this airline when traveling to Ontario. Keep in mind that there are 7 different airlines that fly to Ontario on a routine basis, so you have a few additional options to choose from.

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

As of August 2026, 6 flights take off from Chicago and land in Ontario each week. The most common flight departure day for this route is Wed, with 33% of weekly flights taking off on this day.

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

Flights via Houston (IAH) offer the lowest average round-trip price of $188.

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

Flights connecting via Phoenix (PHX) have the shortest average one-way travel time: 5h 51m.

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

Phoenix (PHX) has the shortest average layover time for this route: 0h 53m.

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

Southwest, Delta, and United Airlines are the most popular carriers operating from Chicago to Ontario

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

Prices for flights from Chicago to Ontario Airport refresh daily.

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

The number of operators available for flights from Chicago to Ontario Airport is 5 as of August 2026.

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

The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Chicago to Ontario Airport.

What documentation or ID do you need to fly to Ontario Airport?

The travel and health documents required for your trip to Ontario Airport 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 Ontario Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

$61 Cheap Flights from Chicago to Ontario in 2026

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from Chicago to Los Angeles

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One-way

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Cheap round-trip flights

Enter your travel dates to find the best prices.

6:30 am - 11:47 pmORD Chicago O'Hare Intl-ONT Ontario

19h 17m1 stop Denver Intl

11:45 am - 12:23 amONT Ontario-ORD Chicago O'Hare Intl

10h 38m1 stop Denver Intl

$148Frontier

Wed, Sep 30 - Sat, Oct 3

6:20 am - 4:48 pmORD Chicago O'Hare Intl-ONT Ontario

12h 28m1 stop Dallas/Fort Worth

8:35 pm - 5:16 amONT Ontario-ORD Chicago O'Hare Intl

6h 41m1 stop Las Vegas Harry Reid Intl

$160Frontier

Sat, Oct 17 - Mon, Oct 19

2:00 pm - 4:10 pmMDW Chicago Midway-ONT Ontario

4h 10mnonstop

11:55 pm - 5:45 amONT Ontario-MDW Chicago Midway

3h 50mnonstop

$239Southwest

Thu, Sep 10 - Sat, Sep 19

3:30 pm - 5:45 pmMDW Chicago Midway-ONT Ontario

4h 15mnonstop

6:30 am - 12:20 pmONT Ontario-MDW Chicago Midway

3h 50mnonstop

$239Southwest

Wed, Oct 28 - Sat, Oct 31

6:15 pm - 8:48 pmORD Chicago O'Hare Intl-ONT Ontario

4h 33mnonstop

6:00 am - 12:15 pmONT Ontario-ORD Chicago O'Hare Intl

4h 15mnonstop

$239American Airlines

Thu, Jan 7 - Mon, Jan 11

2:22 pm - 8:24 pmORD Chicago O'Hare Intl-ONT Ontario

8h 02m1 stop Portland

10:04 am - 5:38 amONT Ontario-ORD Chicago O'Hare Intl

17h 34m1 stop Las Vegas Harry Reid Intl

$245Multiple Airlines

Sat, Sep 5 - Sat, Sep 12

6:15 pm - 8:48 pmORD Chicago O'Hare Intl-ONT Ontario

4h 33mnonstop

6:00 am - 12:15 pmONT Ontario-ORD Chicago O'Hare Intl

4h 15mnonstop

$248American Airlines

Wed, Jan 20 - Sun, Jan 24

8:33 pm - 10:59 pmORD Chicago O'Hare Intl-ONT Ontario

4h 26mnonstop

1:18 pm - 10:46 pmONT Ontario-ORD Chicago O'Hare Intl

7h 28m1 stop Denver Intl

$249United Airlines

Sat, Sep 19 - Wed, Sep 23

8:33 pm - 10:59 pmORD Chicago O'Hare Intl-ONT Ontario

4h 26mnonstop

9:01 am - 8:26 pmONT Ontario-ORD Chicago O'Hare Intl

9h 25m1 stop San Francisco

$249United Airlines

Wed, Sep 9 - Thu, Sep 10

2:22 pm - 8:24 pmORD Chicago O'Hare Intl-ONT Ontario

8h 02m1 stop Portland

8:17 am - 8:15 pmONT Ontario-ORD Chicago O'Hare Intl

9h 58m1 stop Dallas/Fort Worth

$249Multiple Airlines

Sat, Sep 5 - Sun, Sep 6

Cheap last minute flights

Enter your travel dates to find the best prices.

9:26 pm - 8:36 amMDW Chicago Midway-ONT Ontario

13h 10m1 stop Dallas/Fort Worth

8:17 am - 8:31 pmONT Ontario-MDW Chicago Midway

10h 14m1 stop Dallas/Fort Worth

$178Frontier

Mon, Aug 24 - Thu, Aug 27

2:41 pm - 11:50 pmORD Chicago O'Hare Intl-ONT Ontario

11h 09m1 stop Denver Intl

9:37 am - 8:15 pmONT Ontario-ORD Chicago O'Hare Intl

8h 38m1 stop Dallas/Fort Worth

$178Frontier

Sat, Aug 22 - Tue, Sep 1

8:06 pm - 10:35 pmORD Chicago O'Hare Intl-ONT Ontario

4h 29mnonstop

1:18 pm - 10:46 pmONT Ontario-ORD Chicago O'Hare Intl

7h 28m1 stop Denver Intl

$267United Airlines

Fri, Aug 21 - Mon, Aug 24

7:44 pm - 11:34 pmORD Chicago O'Hare Intl-ONT Ontario

5h 50m1 stop Salt Lake City

1:06 pm - 9:33 pmONT Ontario-ORD Chicago O'Hare Intl

6h 27m1 stop Salt Lake City

$277Delta

Mon, Aug 24 - Wed, Aug 26

4:45 pm - 10:23 pmORD Chicago O'Hare Intl-ONT Ontario

7h 38m1 stop Salt Lake City

1:06 pm - 9:33 pmONT Ontario-ORD Chicago O'Hare Intl

6h 27m1 stop Salt Lake City

$277Delta

Sat, Aug 22 - Wed, Aug 26

5:00 am - 9:34 amORD Chicago O'Hare Intl-ONT Ontario

6h 34m1 stop Dallas/Fort Worth

6:15 am - 4:05 pmONT Ontario-ORD Chicago O'Hare Intl

7h 50m1 stop Phoenix Sky Harbor Intl

$277American Airlines

Fri, Aug 21 - Sat, Aug 22

6:40 am - 10:15 amMDW Chicago Midway-ONT Ontario

5h 35m1 stop Denver Intl

11:55 pm - 5:45 amONT Ontario-MDW Chicago Midway

3h 50mnonstop

$288Southwest

Tue, Aug 25 - Tue, Sep 1

6:00 am - 12:30 pmMDW Chicago Midway-ONT Ontario

8h 30m1 stop Dallas Love Field

8:30 am - 7:10 pmONT Ontario-MDW Chicago Midway

8h 40m1 stop Austin Bergstrom

$298Southwest

Tue, Aug 25 - Tue, Sep 1

8:06 pm - 10:35 pmORD Chicago O'Hare Intl-ONT Ontario

4h 29mnonstop

9:01 am - 8:40 pmONT Ontario-ORD Chicago O'Hare Intl

9h 39m1 stop San Francisco

$312United Airlines

Mon, Aug 24 - Wed, Aug 26

6:00 am - 1:31 pmORD Chicago O'Hare Intl-ONT Ontario

9h 31m1 stop Dallas/Fort Worth

2:27 pm - 12:18 amONT Ontario-ORD Chicago O'Hare Intl

7h 51m1 stop Dallas/Fort Worth

$377American Airlines

Sun, Aug 23 - Tue, Aug 25

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Frontier flights from Chicago to Ontario

Our best Frontier deals on Chicago to Ontario flight tickets

Frontier

Sep 30

ORD6:30 amChicago O'Hare Intl

19h 17m

1 stop

ONT11:47 pmOntario

Oct 3

ONT11:45 amOntario

10h 38m

1 stop

ORD12:23 amChicago O'Hare Intl

$148

Frontier

Sep 24

ORD1:01 pmChicago O'Hare Intl

7h 38m

1 stop

ONT6:39 pmOntario

Sep 26

ONT11:45 amOntario

10h 38m

1 stop

ORD12:23 amChicago O'Hare Intl

$160

Frontier

Sep 30

ORD6:30 amChicago O'Hare Intl

6h 00m

1 stop

ONT10:30 amOntario

Oct 7

ONT11:45 amOntario

10h 38m

1 stop

ORD12:23 amChicago O'Hare Intl

$161

Delta flights from Chicago to Ontario

Our best Delta deals on Chicago to Ontario flight tickets

Delta

Sep 15

MDW6:05 amChicago Midway

7h 00m

1 stop

ONT11:05 amOntario

Sep 22

ONT12:17 pmOntario

8h 27m

1 stop

MDW10:44 pmChicago Midway

$259

Delta

Sep 15

MDW6:05 amChicago Midway

7h 00m

1 stop

ONT11:05 amOntario

Sep 22

ONT6:00 pmOntario

12h 48m

2 stops

MDW8:48 amChicago Midway

$264

Delta

Sep 15

MDW9:29 amChicago Midway

12h 55m

2 stops

ONT8:24 pmOntario

Sep 22

ONT6:00 pmOntario

12h 48m

2 stops

MDW8:48 amChicago Midway

$269

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

ChicagoOntario

ORD Chicago O'Hare Intl - ONT Ontario

ORDONT

Chicago O'Hare Intl

Wed 9/30

6:30 am-11:47 pm

1 stop19h 17m

Ontario

Sat 10/3

11:45 am-12:23 am

1 stop10h 38m

$148

ChicagoOntario

ORD Chicago O'Hare Intl - ONT Ontario

ORDONT

Chicago O'Hare Intl

Sat 10/17

6:20 am-4:48 pm

1 stop12h 28m

Ontario

Mon 10/19

8:35 pm-5:16 am

1 stop6h 41m

$160

Quickest round-trip

ChicagoOntario

MDW Chicago Midway - ONT Ontario

MDWONT

Chicago Midway

Thu 9/10

2:00 pm-4:10 pm

Nonstop4h 10m

Ontario

Sat 9/19

11:55 pm-5:45 am

Nonstop3h 50m

$239

ChicagoOntario

MDW Chicago Midway - ONT Ontario

MDWONT

Chicago Midway

Wed 10/28

3:30 pm-5:45 pm

Nonstop4h 15m

Ontario

Sat 10/31

6:30 am-12:20 pm

Nonstop3h 50m

$239

ChicagoOntario

ORD Chicago O'Hare Intl - ONT Ontario

ORDONT

Chicago O'Hare Intl

Thu 1/7

6:15 pm-8:48 pm

Nonstop4h 33m

Ontario

Mon 1/11

6:00 am-12:15 pm

Nonstop4h 15m

$239

ChicagoOntario

ORD Chicago O'Hare Intl - ONT Ontario

ORDONT

Chicago O'Hare Intl

Sat 9/5

2:22 pm-8:24 pm

1 stop8h 02m

Ontario

Sat 9/12

10:04 am-5:38 am

1 stop17h 34m

$245

ChicagoOntario

ORD Chicago O'Hare Intl - ONT Ontario

ORDONT

Chicago O'Hare Intl

Wed 1/20

6:15 pm-8:48 pm

Nonstop4h 33m

Ontario

Sun 1/24

6:00 am-12:15 pm

Nonstop4h 15m

$248

ChicagoOntario

ORD Chicago O'Hare Intl - ONT Ontario

ORDONT

Chicago O'Hare Intl

Sat 9/19

8:33 pm-10:59 pm

Nonstop4h 26m

Ontario

Wed 9/23

1:18 pm-10:46 pm

1 stop7h 28m

$249

ChicagoOntario

ORD Chicago O'Hare Intl - ONT Ontario

ORDONT

Chicago O'Hare Intl

Wed 9/9

8:33 pm-10:59 pm

Nonstop4h 26m

Ontario

Thu 9/10

9:01 am-8:26 pm

1 stop9h 25m

$249

ChicagoOntario

ORD Chicago O'Hare Intl - ONT Ontario

ORDONT

Chicago O'Hare Intl

Sat 9/5

2:22 pm-8:24 pm

1 stop8h 02m

Ontario

Sun 9/6

8:17 am-8:15 pm

1 stop9h 58m

$249

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 Chicago to Ontario

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 typical price of a round-trip flight between Chicago and Ontario?

Prices are currently low for flights on this route.

Typical prices usually range from $268 to $588.
The lowest price recently found on this route was $148.

What is the cheapest month to fly to Ontario?

In general, October is the cheapest month to fly from Chicago to Ontario. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $333. If you aren’t able to travel during the month of October, then book flights to Ontario from Chicago during August instead. Flights to Ontario in August, while not as cheap as those in October, still average around $363.

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

The cheapest day to depart on your flight to Ontario is on a Thursday when prices can be found for as low as $425. This is often the case because there is less demand to fly during this day of the week. When flying out on a Monday, the most expensive travel day of the week, you can expect to see flight prices from Chicago to Ontario for around $740.

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

At noon is the cheapest time of day to fly from Chicago to Ontario when you can find flight prices for as low as $271. Flying to Ontario at noon is an ideal time because this is during off-peak travel hours. If you have a flexible travel schedule, then try to avoid flying in the morning when prices are $516 on average. Flights to Ontario from Chicago in the morning are generally more expensive because this time of day is more convenient for travelers’ schedules.

What is the cheapest Chicago to Ontario flight route?

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

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

There are 4 cabin classes available to choose from on Chicago to Ontario 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 Chicago to Ontario flights?

No. A direct flight is the cheapest option for a flight between Chicago to Ontario.

How have Chicago to Ontario flight prices changed over time?

As of August 2026, prices for Chicago to Ontario flights are approximately 67% more expensive when compared to flights at the same time last year.

When to book flights from Chicago to Ontario

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

Estimated round-trip price

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

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

Best Price Found	$61
Fastest flight time	4h 10m
Direct flights	Every day
Airports in Ontario	1 airport

The best one-way flight to Ontario from Chicago in the past 72 hours is $61. The best round-trip flight deal from Chicago to Ontario found on momondo in the last 72 hours is $148.

The fastest flight from Chicago to Ontario takes 4h 10m

Direct flights go from Chicago to Ontario every day.

There is 1 airport in Ontario. From Chicago there are direct flights to Ontario (ONT).

Search flight deals

Frequently asked questions about flying from Chicago to Ontario

How far is Chicago to Ontario by plane?
The distance between Chicago and Ontario is about 1710.7 mi. In terms of flight time, this usually takes a little over 4h 10m.
When did momondo last update prices for flights from Chicago to Ontario Airport?
Prices for flights from Chicago to Ontario Airport refresh daily.
How many operators does momondo search for flights from Chicago to Ontario Airport?
The number of operators available for flights from Chicago to Ontario Airport is 5 as of August 2026.
How old do you have to be to fly from Chicago to Ontario Airport?
The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Chicago to Ontario Airport.
What documentation or ID do you need to fly to Ontario Airport?
The travel and health documents required for your trip to Ontario Airport 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 Ontario Airport. 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 Chicago to Ontario?
Based on momondo bookings for flights between Chicago and Ontario, the leading plane model is Boeing 737 MAX 8, making up 28.00% of the total bookings. Other popular models include Boeing 737-800 with 17.45%, Boeing 737-900 with 12.00%, and Airbus A321neo with 9.09%.
What is the most popular airline from Chicago to Ontario?
Based on momondo bookings for this flight route, the most popular airline on flight routes from Chicago to Ontario is Southwest (43% of total bookings). The next most popular airlines are United Airlines (30%) and Frontier (27%).

Best airlines flying from Chicago to Ontario

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

Airline	Rating	Free Cancellation	Price
Frontier	PriceFrom $153	Free Cancellation	Rating 5.6 2,659 reviews	Search Frontier flights
Delta	PriceFrom $236	Free Cancellation	Rating 7.8 8,513 reviews	Search Delta flights
Southwest	PriceFrom $268	Free Cancellation	Rating 8.0 4,215 reviews	Search Southwest flights
United Airlines	PriceFrom $278	Free Cancellation	Rating 7.4 10,105 reviews	Search United Airlines flights
American Airlines	PriceFrom $307	Free Cancellation	Rating 7.1 11,979 reviews	Search American Airlines flights

Southwest Flights From Chicago to Ontario
Across 2 Southwest flights from Chicago to Ontario this week, the average price was $457, with the best Southwest deals starting from $268 round-trip. 4,215 users have rated Southwest on momondo, with an average score of 8.0/10.
United Airlines Flights From Chicago to Ontario
Another popular option for Chicago to Ontario flights is United Airlines (7.4/10, 10,104 ratings). United Airlines flies from Chicago to Ontario around 4 times per week, with deals starting from $278 round-trip and rising to an average price of around $474.

Why use momondo?

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

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

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

All flight searches from Chicago to Ontario on momondo can be filtered to show those which offer flexible booking policies.

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

momondo helps you find the best flight between Chicago and Ontario by providing filters to narrow your choice of flights to those matching your criteria. You can select flights based on numerous factors such as price, departure and landing times, airport and airline.

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

If you are simply researching potential flights to Ontario, momondo offers a useful price alert feature which will track prices for flights to Ontario from Chicago and alert you when they change.

An easier way to manage your Ontario 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.

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Cheap flights from Chicago to Los Angeles from $61

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Chicago to Los Angeles departing on 9/15. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

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Frontier flights from Chicago to Ontario

Our best Frontier deals on Chicago to Ontario flight tickets

Delta flights from Chicago to Ontario

Our best Delta deals on Chicago to Ontario flight tickets

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How to get the cheapest flight ticket from Chicago to Ontario

What is the typical price of a round-trip flight between Chicago and Ontario?

What is the cheapest month to fly to Ontario?

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

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

What is the cheapest Chicago to Ontario flight route?

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

Can stopping save me money on Chicago to Ontario flights?

How have Chicago to Ontario flight prices changed over time?

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

What airlines fly to Ontario?

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

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

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

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

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

When to book flights from Chicago to Ontario

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

Best Price Found

Fastest flight time

Direct flights

Airports in Ontario

Frequently asked questions about flying from Chicago to Ontario

Best airlines flying from Chicago to Ontario

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

Why use momondo?

An easier way to manage your Ontario 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

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

Find better results for your trip to the United States

Airports servicing California

Fly your favorite airline to Los Angeles

Airlines are sorted and displayed according to clicks in the past 7 days on momondo

Cabin classes currently available on flights to Los Angeles

List of cabin classes available on flights landing in Los Angeles. Availability may vary depending on flight origin and airline.

Popular cities in the United States

Popular flights according to clicks in the last 7 days on momondo

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According to popular flight searches on momondo this year

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