Find Cheap Flights from Ontario to Chicago O'Hare International (ONT - ORD)

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Wed 1/24
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Good to Know

Low Season:
January
Best time to beat the crowds
3%
expected price decrease
High Season:
June
Most popular time to fly
5%
expected price increase
Average Price:
$378
(avg. price over the last 2 weeks)
Good Deal:
$269
or less (round trip)

When to Book Flights from Ontario to Chicago O'Hare International

Average price per month
Flight prices as travel date approaches
-1 day
-2 days

Top tips for Finding a Cheap Flight

Looking for a cheap flight? 25% of our users found flights on this route for $268 or less.
The cheapest flight from Ontario to Chicago O'Hare International was found 90 days before departure, on average.
Book at least 1 week before departure in order to get a below-average price.
High season is considered to be May, June and July. The cheapest month to fly is January.
Morning departure is around 1% cheaper than an evening flight, on average*.
*Average of the lowest prices shown in KAYAK’s search results for departures within the next 30 days

FAQs for Booking Ontario to Chicago O'Hare International Flights

How long does a flight from Ontario to Chicago O'Hare International take?
An average nonstop flight takes 6h 20m, covering a distance of 1697 miles.
Which airlines provide the cheapest flights from Ontario to Chicago O'Hare International?
In the past 3 days, the cheapest round-trip tickets were found on Frontier ($144), Multiple Airlines ($178) and United ($258).
Do I need a passport to fly between Ontario and Chicago O'Hare International?
No.
What’s the cheapest day of the week to fly Ontario to Chicago O'Hare International?
For Ontario to Chicago O'Hare International, Thursday is the cheapest day to fly on average and Tuesday is the most expensive. Flying from Chicago O'Hare International back to Ontario, the best deals are generally found on Tuesday, with Saturday being the most expensive.

Book cheap flights from Ontario to Chicago O'Hare International (round-trip)

Airports
Origin
Ontario
$144
only
$144
Destination
Chicago
$144
only
$144
Thu, Jan 18
ONT
ORD
12h 57m
Tue, Jan 23
ORD
ONT
13h 57m
Trip: 6 days
5.7OkayShow reviews
Overall 5.7 Okay
Based on 33565 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
ATL
TTN
Excellent 9.3

I was having a terrible migraine and one of the female on flight staff directed me to open seats where I could lay down. She also provided me with lots of water and a bag of ice!

SJU
MCO
Excellent 9.5

I really liked how amazingly friendly all the crew were. They all had a real smile and tried to help every costumer Kindly. Never saw this from ANY airline. They are EXCELLENT!

Many crying babies, most but that's nothing you could do LOL!

GRR
MCO
Excellent 10.0

Early departure. Non stop. Early arrival. Ease of travel.

OMA
MCO
Excellent 8.0

Nice flight. Arrived early.

4.99 for a can of coke???

ISP
TPA
Mediocre 2.3

In flight crew was cordial, warm, professional

Everything else was a sh*tshow: bad information, confused and angry employees, flight was 7-hours late

Wed, Apr 4
ONT
ORD
6h 25m
Wed, Apr 11
ORD
ONT
12h 25m
Trip: 8 days
Overall 0.0 Poor
Based on 0 reviews
Fri, Apr 13
ONT
ORD
6h 21m
Mon, Apr 16
ORD
ONT
7h 15m
Trip: 4 days
7.0GoodShow reviews
Overall 7.0 Good
Based on 53752 reviews
Overall
7.2
Boarding
7.4
Comfort
6.9
Crew
7.7
Entertainment
6.5
Food
6.4
MEX
DEN
Okay 5.0

We did get to our destination.

Flight was late, as always. I couldn’t sit with my spouse. Rows are so tight, one can barely get in/out and we are smaller than normal size. Baggage fees make overhead compartment loading a real nightmare. I wonder what they will think of next to make flying an even more terrible experience.

EWR
PTY
Mediocre 3.0

I left New Jersey during snow storm. Flights had been cancelled on the previous days but our flight was not. It did not leave on time, had to switch planes before we actually took off. My luggage was lost. I did not make my connecting flight. Had sty over in Panama. Got to my destination a day late without my carry on ( checked at the gate...lost). Still have not located my other 2 bags. Very stressful expirence. Will not fly united again. Staff at my lay over was poorly trained at handling the situation and my luggage issue is taking a very long time to correct.

FRA
IAH
Excellent 9.0

Good Movie Selection, food was descent, no screaming children,

Layover in Frankfurt too long; Unable to sleep on flight, nearby windows were open creating too much light, seating a bit too close to relax.

HKG
EWR
Mediocre 2.6

Nothing, absolutely nothing.

The flight attendants were pretty much what I've come to expect on U.S. airlines--overweight, older, and sloppy in appearance. One of them looked like she had rolled out of bed ten minutes before arriving at the gate. It was the complete antithesis to the flight attendants on Hong Kong Airlines. Ah, for the good old days of air travel. Before the plane ever took off it was announced the the entertainment system on the seat back ahead of those in comfort seats was not working and wouldn't be for the duration of the flight. Having paid an additional $239 for the comfort seat in the hopes of making a 16-hour flight go by a bit faster, this was unconscionable. The food was far inferior to Hong Kong Airlines. In short, it was the trip from hell.

SFO
DCA
Good 6.0

Good service from crew. Fairly quick boarding process.

Aircraft seemed fairly new on inside, but didn't have power outlets. Small uncomfortable seats on a long flight that is almost always full.

Wed, Jan 31
ONT
ORD
21h 56m
Tue, Feb 6
ORD
ONT
15h 12m
Trip: 7 days
5.7OkayShow reviews
Overall 5.7 Okay
Based on 33565 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
OMA
MCO
Excellent 8.0

Nice flight. Arrived early.

4.99 for a can of coke???

GRR
MCO
Excellent 10.0

Early departure. Non stop. Early arrival. Ease of travel.

DEN
DCA
Excellent 8.0

Time management

Service

SNA
DEN
Excellent 8.3

Was surprised to find out I had to pay $45 fee for carry-on bag.

MCO
OMA
Excellent 8.0

Nice flight. No issues. Flight staff was great.

Front desk check in guy in Orlando was a bit shady. Asked that we pay for our check-in bags with cash and wanted 10$ cash to put our seats together. I did not give him cash and had to ask for a reciept for the checked bags. We were 4 hours early for check in.

Fri, Feb 2
ONT
ORD
21h 56m
Tue, Feb 6
ORD
ONT
15h 12m
Trip: 5 days
5.7OkayShow reviews
Overall 5.7 Okay
Based on 33565 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
GRR
MCO
Excellent 10.0

Early departure. Non stop. Early arrival. Ease of travel.

ATL
TTN
Excellent 9.3

I was having a terrible migraine and one of the female on flight staff directed me to open seats where I could lay down. She also provided me with lots of water and a bag of ice!

DEN
DCA
Excellent 8.0

Time management

Service

SNA
DEN
Excellent 8.3

Was surprised to find out I had to pay $45 fee for carry-on bag.

LAX
DEN
Excellent 8.0

Time management

Service

Tue, Jul 3
ONT
ORD
7h 42m
Tue, Jul 10
ORD
ONT
6h 03m
Trip: 8 days
7.8GoodShow reviews
Overall 7.8 Good
Based on 15207 reviews
Overall
8.0
Boarding
8.1
Comfort
7.7
Crew
8.4
Entertainment
7.5
Food
7.3
JFK
CMH
Excellent 9.6

Always nice to be on an American plane out of an American airport.....SO much more professional. :))

YUL
DTW
Mediocre 2.0

Not applied

Not applied

MSY
JFK
Excellent 10.0

The overhead bin did not stay down low enough so that I could place my bag in. It would lower then before I could place my bag raise slightly by a few inches. For someone of my height (5’5”) that was problematic. Fortunately another passenger saw my dilemma and held the bin lower to its full opening capacity. This also momentarily slowed down the boarding process.

CUN
MSY
Good 7.0

The outbound crew was terrific. The flight itself was fine. We even arrived early.

Upon deplaning in Cancun, ALL passengers are put on a bus and driven far away from the terminals to an arrivals area. Those of us with connecting flights are royally f*cked at that point, especially if your connection is short, as mine was. The so-called shuttle to the departure terminals, which are entire kilometers away, was to arrive in like half an hour. HALF AN HOUR. Who has this time to spare?? The alternative to the shuttle is paying a taxi that charges a hefty fare--and God help you if you don't have cash. The departures terminal was swamped and only thru begging assistance and line cuts did I make my connection...and then only by the skin of my teeth. It was a complete nightmare.

BOS
MKE
Excellent 10.0

Direct flight, on time, friendly crew, smooth flight

Thu, Mar 1
ONT
ORD
12h 35m
Tue, Mar 6
ORD
ONT
15h 08m
Trip: 6 days
5.7OkayShow reviews
Overall 5.7 Okay
Based on 33565 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
MCO
ISP
Excellent 8.3

Cheap tickets, friendly staff, no major complaints

Seats were a bit uncomfortable

SJU
MCO
Excellent 9.5

I really liked how amazingly friendly all the crew were. They all had a real smile and tried to help every costumer Kindly. Never saw this from ANY airline. They are EXCELLENT!

Many crying babies, most but that's nothing you could do LOL!

SNA
DEN
Excellent 8.3

Was surprised to find out I had to pay $45 fee for carry-on bag.

LAX
DEN
Excellent 8.0

Time management

Service

DEN
DCA
Excellent 8.0

Time management

Service

Tue, May 8
ONT
ORD
9h 13m
Wed, May 16
ORD
ONT
12h 13m
Trip: 9 days
5.7OkayShow reviews
Overall 5.7 Okay
Based on 33565 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
DEN
DCA
Excellent 8.0

Time management

Service

OMA
MCO
Excellent 8.0

Nice flight. Arrived early.

4.99 for a can of coke???

MCO
OMA
Excellent 8.0

Nice flight. No issues. Flight staff was great.

Front desk check in guy in Orlando was a bit shady. Asked that we pay for our check-in bags with cash and wanted 10$ cash to put our seats together. I did not give him cash and had to ask for a reciept for the checked bags. We were 4 hours early for check in.

MCO
DEN
Excellent 10.0

Smooth and really fast way to get to Denver

A little bit of a crowd at the entrance of the gate. Otherwise everything was excellent.

GRR
MCO
Excellent 10.0

Early departure. Non stop. Early arrival. Ease of travel.

Thu, Feb 22
ONT
ORD
12h 36m
Sun, Feb 25
ORD
ONT
14h 13m
Trip: 4 days
5.7OkayShow reviews
Overall 5.7 Okay
Based on 33565 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
SNA
DEN
Excellent 8.3

Was surprised to find out I had to pay $45 fee for carry-on bag.

MCO
OMA
Excellent 8.0

Nice flight. No issues. Flight staff was great.

Front desk check in guy in Orlando was a bit shady. Asked that we pay for our check-in bags with cash and wanted 10$ cash to put our seats together. I did not give him cash and had to ask for a reciept for the checked bags. We were 4 hours early for check in.

DEN
DCA
Excellent 8.0

Time management

Service

MCO
DEN
Excellent 10.0

Smooth and really fast way to get to Denver

A little bit of a crowd at the entrance of the gate. Otherwise everything was excellent.

SJU
MCO
Excellent 9.5

I really liked how amazingly friendly all the crew were. They all had a real smile and tried to help every costumer Kindly. Never saw this from ANY airline. They are EXCELLENT!

Many crying babies, most but that's nothing you could do LOL!

Fri, Feb 23
ONT
ORD
21h 56m
Sun, Feb 25
ORD
ONT
14h 13m
Trip: 3 days
5.7OkayShow reviews
Overall 5.7 Okay
Based on 33565 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
DEN
DCA
Excellent 8.0

Time management

Service

OMA
MCO
Excellent 8.0

Nice flight. Arrived early.

4.99 for a can of coke???

SJU
MCO
Excellent 9.5

I really liked how amazingly friendly all the crew were. They all had a real smile and tried to help every costumer Kindly. Never saw this from ANY airline. They are EXCELLENT!

Many crying babies, most but that's nothing you could do LOL!

GRR
MCO
Excellent 10.0

Early departure. Non stop. Early arrival. Ease of travel.

ISP
TPA
Mediocre 2.3

In flight crew was cordial, warm, professional

Everything else was a sh*tshow: bad information, confused and angry employees, flight was 7-hours late

Tue, Jun 5
ONT
ORD
8h 50m
Wed, Jun 13
ORD
ONT
12h 13m
Trip: 9 days
Overall 0.0 Poor
Based on 0 reviews
Fri, Mar 2
ONT
ORD
11h 12m
Sun, Mar 4
ORD
ONT
14h 09m
Trip: 3 days
5.7OkayShow reviews
Overall 5.7 Okay
Based on 33565 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
RSW
PVD
Excellent 10.0

Basic, simple. No frills but economical

Seats did not recline.. So uncomfortable

SJU
MCO
Excellent 9.5

I really liked how amazingly friendly all the crew were. They all had a real smile and tried to help every costumer Kindly. Never saw this from ANY airline. They are EXCELLENT!

Many crying babies, most but that's nothing you could do LOL!

MCO
OMA
Excellent 8.0

Nice flight. No issues. Flight staff was great.

Front desk check in guy in Orlando was a bit shady. Asked that we pay for our check-in bags with cash and wanted 10$ cash to put our seats together. I did not give him cash and had to ask for a reciept for the checked bags. We were 4 hours early for check in.

MCO
DEN
Excellent 10.0

Smooth and really fast way to get to Denver

A little bit of a crowd at the entrance of the gate. Otherwise everything was excellent.

LAX
DEN
Excellent 8.0

Time management

Service

Wed, Mar 28
ONT
ORD
9h 09m
Wed, Apr 4
ORD
ONT
7h 47m
Trip: 8 days
7.0GoodShow reviews
Overall 7.0 Good
Based on 53752 reviews
Overall
7.2
Boarding
7.4
Comfort
6.9
Crew
7.7
Entertainment
6.5
Food
6.4
SFO
DCA
Good 6.0

Good service from crew. Fairly quick boarding process.

Aircraft seemed fairly new on inside, but didn't have power outlets. Small uncomfortable seats on a long flight that is almost always full.

IAD
RDU
Excellent 10.0

The efficiency and professionalism was excellent. Both legs of my trip went great!

LAX
HNL
Excellent 10.0

Cell phone holder and power outlets that actually work

Basic economy pricing

EWR
PTY
Mediocre 3.0

I left New Jersey during snow storm. Flights had been cancelled on the previous days but our flight was not. It did not leave on time, had to switch planes before we actually took off. My luggage was lost. I did not make my connecting flight. Had sty over in Panama. Got to my destination a day late without my carry on ( checked at the gate...lost). Still have not located my other 2 bags. Very stressful expirence. Will not fly united again. Staff at my lay over was poorly trained at handling the situation and my luggage issue is taking a very long time to correct.

SFO
MEX
Excellent 10.0

As expected.

No

Wed, Apr 11
ONT
ORD
23h 36m
Wed, Apr 18
ORD
ONT
12h 25m
Trip: 8 days
5.7OkayShow reviews
Overall 5.7 Okay
Based on 33565 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
DEN
DCA
Excellent 8.0

Time management

Service

LAX
DEN
Excellent 8.0

Time management

Service

RSW
PVD
Excellent 10.0

Basic, simple. No frills but economical

Seats did not recline.. So uncomfortable

MCO
ISP
Excellent 8.3

Cheap tickets, friendly staff, no major complaints

Seats were a bit uncomfortable

SNA
DEN
Excellent 8.3

Was surprised to find out I had to pay $45 fee for carry-on bag.

Fri, May 4
ONT
ORD
6h 20m
Sun, May 6
ORD
ONT
7h 20m
Trip: 3 days
7.0GoodShow reviews
Overall 7.0 Good
Based on 53752 reviews
Overall
7.2
Boarding
7.4
Comfort
6.9
Crew
7.7
Entertainment
6.5
Food
6.4
IND
IAD
Excellent 10.0

Excellent flight nice ground and flight crew

AUS
IAH
Mediocre 2.0

N/a

There was a name change needed for the flight..they weren’t able to support that at all resulting me cancelling the flight.

IAD
RDU
Excellent 10.0

The efficiency and professionalism was excellent. Both legs of my trip went great!

AMS
IAD
Good 7.6

Good price.

It took you 4 days for you to get back to me with the confirmation number after I had requested it via e-mail. Also, you should note Lufthansa-issued documents never commence with "220-" and then the subsequent numbers. Lufthansa tickets are always issued with "2220-" at the beginning and then the subsequent numbers. You need to update your computers otherwise with the original Lufthansa-issued ticket number you provide at time of booking, the booking will not show up in Lufthansa systems.

SFO
DCA
Good 6.0

Good service from crew. Fairly quick boarding process.

Aircraft seemed fairly new on inside, but didn't have power outlets. Small uncomfortable seats on a long flight that is almost always full.

Thu, Jan 25
ONT
ORD
12h 57m
Tue, Jan 30
ORD
ONT
15h 12m
Trip: 6 days
5.7OkayShow reviews
Overall 5.7 Okay
Based on 33565 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
SJU
MCO
Excellent 9.5

I really liked how amazingly friendly all the crew were. They all had a real smile and tried to help every costumer Kindly. Never saw this from ANY airline. They are EXCELLENT!

Many crying babies, most but that's nothing you could do LOL!

MCO
OMA
Excellent 8.0

Nice flight. No issues. Flight staff was great.

Front desk check in guy in Orlando was a bit shady. Asked that we pay for our check-in bags with cash and wanted 10$ cash to put our seats together. I did not give him cash and had to ask for a reciept for the checked bags. We were 4 hours early for check in.

ATL
TTN
Excellent 9.3

I was having a terrible migraine and one of the female on flight staff directed me to open seats where I could lay down. She also provided me with lots of water and a bag of ice!

OMA
MCO
Excellent 8.0

Nice flight. Arrived early.

4.99 for a can of coke???

DEN
DCA
Excellent 8.0

Time management

Service

Tue, Jun 5
ONT
ORD
9h 13m
Wed, Jun 13
ORD
ONT
17h 46m
Trip: 9 days
5.7OkayShow reviews
Overall 5.7 Okay
Based on 33565 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
RSW
PVD
Excellent 10.0

Basic, simple. No frills but economical

Seats did not recline.. So uncomfortable

ATL
TTN
Excellent 9.3

I was having a terrible migraine and one of the female on flight staff directed me to open seats where I could lay down. She also provided me with lots of water and a bag of ice!

DEN
DCA
Excellent 8.0

Time management

Service

MCO
DEN
Excellent 10.0

Smooth and really fast way to get to Denver

A little bit of a crowd at the entrance of the gate. Otherwise everything was excellent.

LAX
DEN
Excellent 8.0

Time management

Service

Wed, May 2
ONT
ORD
23h 52m
Mon, May 7
ORD
ONT
12h 13m
Trip: 6 days
5.7OkayShow reviews
Overall 5.7 Okay
Based on 33565 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
OMA
MCO
Excellent 8.0

Nice flight. Arrived early.

4.99 for a can of coke???

GRR
MCO
Excellent 10.0

Early departure. Non stop. Early arrival. Ease of travel.

MCO
ISP
Excellent 8.3

Cheap tickets, friendly staff, no major complaints

Seats were a bit uncomfortable

RSW
PVD
Excellent 10.0

Basic, simple. No frills but economical

Seats did not recline.. So uncomfortable

ISP
TPA
Mediocre 2.3

In flight crew was cordial, warm, professional

Everything else was a sh*tshow: bad information, confused and angry employees, flight was 7-hours late

Fri, Jun 1
ONT
ORD
23h 52m
Wed, Jun 6
ORD
ONT
17h 46m
Trip: 6 days
5.7OkayShow reviews
Overall 5.7 Okay
Based on 33565 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
RSW
PVD
Excellent 10.0

Basic, simple. No frills but economical

Seats did not recline.. So uncomfortable

MCO
ISP
Excellent 8.3

Cheap tickets, friendly staff, no major complaints

Seats were a bit uncomfortable

SNA
DEN
Excellent 8.3

Was surprised to find out I had to pay $45 fee for carry-on bag.

MCO
OMA
Excellent 8.0

Nice flight. No issues. Flight staff was great.

Front desk check in guy in Orlando was a bit shady. Asked that we pay for our check-in bags with cash and wanted 10$ cash to put our seats together. I did not give him cash and had to ask for a reciept for the checked bags. We were 4 hours early for check in.

ATL
TTN
Excellent 9.3

I was having a terrible migraine and one of the female on flight staff directed me to open seats where I could lay down. She also provided me with lots of water and a bag of ice!

Wed, Jul 25
ONT
ORD
12h 42m
Mon, Jul 30
ORD
ONT
17h 46m
Trip: 6 days
5.7OkayShow reviews
Overall 5.7 Okay
Based on 33565 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
MCO
DEN
Excellent 10.0

Smooth and really fast way to get to Denver

A little bit of a crowd at the entrance of the gate. Otherwise everything was excellent.

ISP
TPA
Mediocre 2.3

In flight crew was cordial, warm, professional

Everything else was a sh*tshow: bad information, confused and angry employees, flight was 7-hours late

LAX
DEN
Excellent 8.0

Time management

Service

MCO
ISP
Excellent 8.3

Cheap tickets, friendly staff, no major complaints

Seats were a bit uncomfortable

MCO
OMA
Excellent 8.0

Nice flight. No issues. Flight staff was great.

Front desk check in guy in Orlando was a bit shady. Asked that we pay for our check-in bags with cash and wanted 10$ cash to put our seats together. I did not give him cash and had to ask for a reciept for the checked bags. We were 4 hours early for check in.

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The fares displayed include all taxes and fees for economy class travel and were found by the provider in the last 72 hours. Seats are limited and may not be available on all flights and days. Fares are subject to change and may not be available on all flights or dates of travel. Some carriers charge additional fees for extra checked bags. Please check the carriers' sites.

Ontario to Chicago O'Hare International Flight Information

Flights Arrive in Chicago O'Hare International
Flights Depart from Ontario
Flight Price $144
Distance 1697 miles
Airlines Frontier, United, Delta