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

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Sat 11/18
Sat 11/25
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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:
$374
(avg. price over the last 2 weeks)
Good Deal:
$264
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

When looking for a cheap flight, consider that 25% of our users selected a flight on this route for $264 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 14% 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 5h 50m, 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 ($126), Multiple Airlines ($173) and Delta ($250).
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, Monday is the cheapest day to fly on average and Thursday is the most expensive. Flying from Chicago O'Hare International back to Ontario, the best deals are generally found on Tuesday, with Monday being the most expensive.

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

Airports
Origin
Ontario
$126
only
$126
Destination
Chicago
$126
only
$126
Mon, Jan 8
ONT
ORD
21h 56m
Tue, Jan 16
ORD
ONT
15h 12m
Trip: 9 days
5.6OkayShow reviews
Overall 5.6 Okay
Based on 32923 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
LGA
MIA
Mediocre 3.6

Flight Very late , when departure already at night Uncomfortable seats $45 for a bag and I have drop it off myself after pay

MIA
CVG
Good 6.0

More snack/food options

DEN
SLC
Okay 5.6

Food, entertainment NA, didn’t use. Rest of flight uneventful, happy to say. Because this was so late due to previous leg of journey delayed, our planned transportation to hotel wa not available.

MIA
PHL
Okay 5.6

Flight was on time. The flight was fast and the crew was helpful and courteous

It was cramped. Couldn't recline back. Was only offered water

FSD
DEN
Okay 4.6

The scheduled plane had a mechanical problem so we deplaned for alternative plan. It took six long hours to get another plane in. Meantime passengers stood in line for hours to make other arrangements. It would have been appropriate for the airline to call in extra staff to help stranded passengers. We missed the scheduled connecting flight and a tour. We got in at 1:00 am, 12 hours later than planned. We had meetings next day and were very tired because we got in so late

Thu, Jan 11
ONT
ORD
26h 14m
Sun, Jan 14
ORD
ONT
23h 22m
Trip: 4 days
Overall 0.0 Poor
Based on 0 reviews
Tue, Mar 6
ONT
ORD
5h 50m
Mon, Mar 12
ORD
ONT
5h 58m
Trip: 6 days
7.8GoodShow reviews
Overall 7.8 Good
Based on 13528 reviews
Overall
8.0
Boarding
8.1
Comfort
7.7
Crew
8.4
Entertainment
7.5
Food
7.3
ATL
MCO
Excellent 10.0

Amazing experience thank you Delta

JFK
LAX
Excellent 9.3

Check in was easy through their app. Also very quick lines to drop off bags. Crew was very nice and respectful

Seat are a little bit too close together. But overall very comfortable

BUF
ATL
Excellent 10.0

I asked for a change of seat at the gate and was given it. It really made a difference to be at the window.

ATL
BNA
Excellent 10.0

Compared to previous flight - this was so much better with upgrade to first class and extra space.

YUL
ATL
Good 6.0

Fligth were on time

My flight from Montreal to Atlanta was 2:30 min Left at 6:10 arrive at 8:30 roughly Tried twice to get to my connection earlier and get 9:30 instead of 12:09 fligth to Daytona Delta was not flexible to allow me to book saying i did not have 55 min in between fligth which i had than lear n it will cost $75.00 to change the fligth - What? Very disappointed of Delta - lost 3 hrs at the airport today

Wed, Jan 31
ONT
ORD
21h 56m
Tue, Feb 6
ORD
ONT
15h 12m
Trip: 7 days
5.6OkayShow reviews
Overall 5.6 Okay
Based on 32923 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
PHL
MIA
Excellent 10.0

Same as all the other airlines in my opinion. Just way more afreoadable.

DEN
ORD
Excellent 10.0

On time. Very organized.

FSD
DEN
Okay 4.6

The scheduled plane had a mechanical problem so we deplaned for alternative plan. It took six long hours to get another plane in. Meantime passengers stood in line for hours to make other arrangements. It would have been appropriate for the airline to call in extra staff to help stranded passengers. We missed the scheduled connecting flight and a tour. We got in at 1:00 am, 12 hours later than planned. We had meetings next day and were very tired because we got in so late

PVD
TPA
Excellent 9.3

Cheap, comfortable and friendly staff

Getting off the plane took forever on both legs.

MIA
PHL
Okay 5.6

Flight was on time. The flight was fast and the crew was helpful and courteous

It was cramped. Couldn't recline back. Was only offered water

Tue, Dec 5
ONT
ORD
20h 59m
Thu, Dec 7
ORD
ONT
13h 49m
Trip: 3 days
5.6OkayShow reviews
Overall 5.6 Okay
Based on 32923 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
FSD
DEN
Okay 4.6

The scheduled plane had a mechanical problem so we deplaned for alternative plan. It took six long hours to get another plane in. Meantime passengers stood in line for hours to make other arrangements. It would have been appropriate for the airline to call in extra staff to help stranded passengers. We missed the scheduled connecting flight and a tour. We got in at 1:00 am, 12 hours later than planned. We had meetings next day and were very tired because we got in so late

MCO
DEN
Okay 4.6

The seats were clean; the cabin looked very nice. The plane got me from point A to B safely. smoothest Lansing ever!

Flight was delayed 2.5 hours. No communication from the cockpit, 2 out of the 4 flight attendants we really crabby. Undersea storage was unusually small. I’m 5’8” and my knees were pressed against the seat in front of me and the seats are hard. My legs were numb for part of the trip.

PVD
TPA
Excellent 9.3

Cheap, comfortable and friendly staff

Getting off the plane took forever on both legs.

MIA
CVG
Good 6.0

More snack/food options

MIA
PHL
Okay 5.6

Flight was on time. The flight was fast and the crew was helpful and courteous

It was cramped. Couldn't recline back. Was only offered water

Thu, Nov 30
ONT
ORD
6h 08m
Mon, Dec 4
ORD
ONT
6h 06m
Trip: 5 days
6.0GoodShow reviews
Overall 6.0 Good
Based on 2 reviews
Overall
7.3
Boarding
7.5
Comfort
7.1
Crew
7.8
Entertainment
6.7
Food
6.6
PWM
PHL
Okay 4.6

We arrived on time.

These planes feel like they are made of Legos. They are absurdly tiny and uncomfortable (and I am a small woman). Hot and stinky when boarding and no room for you or your carry on luggage. The days of glamorous air travel seem very far away.

LAX
MIA
Good 7.6

Movies, clean, efficient

Paying of my small Checked bag

SAL
MIA
Excellent 8.6

There was no individual entertainment on board (TV’s, internet, etc)

FAT
DFW
Excellent 10.0

Nice amount of leg room!!!

Nothing

CHO
ORD
Good 7.6

It was a little hot in the plane at during start and touchdown

Mon, Feb 5
ONT
ORD
21h 56m
Fri, Feb 9
ORD
ONT
23h 22m
Trip: 5 days
Overall 0.0 Poor
Based on 0 reviews
Tue, Nov 28
ONT
ORD
13h 00m
Tue, Dec 12
ORD
ONT
13h 36m
Trip: 15 days
5.6OkayShow reviews
Overall 5.6 Okay
Based on 32923 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
LGA
MIA
Mediocre 3.6

Flight Very late , when departure already at night Uncomfortable seats $45 for a bag and I have drop it off myself after pay

FSD
DEN
Okay 4.6

The scheduled plane had a mechanical problem so we deplaned for alternative plan. It took six long hours to get another plane in. Meantime passengers stood in line for hours to make other arrangements. It would have been appropriate for the airline to call in extra staff to help stranded passengers. We missed the scheduled connecting flight and a tour. We got in at 1:00 am, 12 hours later than planned. We had meetings next day and were very tired because we got in so late

MIA
PHL
Okay 5.6

Flight was on time. The flight was fast and the crew was helpful and courteous

It was cramped. Couldn't recline back. Was only offered water

PBI
ISP
Mediocre 2.0

Was unable to make it

MIA
ISP
Excellent 8.5

The terminal was empty. Plenty of seats. Boarding doesn't take long. Arrival at ISP is nice because it is small and empty.

Wed, Dec 6
ONT
ORD
21h 10m
Sun, Dec 10
ORD
ONT
9h 52m
Trip: 5 days
Overall 0.0 Poor
Based on 0 reviews
Thu, Mar 8
ONT
ORD
5h 50m
Mon, Mar 12
ORD
ONT
5h 58m
Trip: 4 days
7.8GoodShow reviews
Overall 7.8 Good
Based on 13528 reviews
Overall
8.0
Boarding
8.1
Comfort
7.7
Crew
8.4
Entertainment
7.5
Food
7.3
YUL
ATL
Good 6.0

Fligth were on time

My flight from Montreal to Atlanta was 2:30 min Left at 6:10 arrive at 8:30 roughly Tried twice to get to my connection earlier and get 9:30 instead of 12:09 fligth to Daytona Delta was not flexible to allow me to book saying i did not have 55 min in between fligth which i had than lear n it will cost $75.00 to change the fligth - What? Very disappointed of Delta - lost 3 hrs at the airport today

ATL
MCO
Excellent 10.0

Amazing experience thank you Delta

CHA
ATL
Excellent 10.0

On time departure and arrival. The Airbus plane has enough legroom for tall persons.

JFK
JAX
Good 7.6

Delta never used to be my first choice in airlines, but of my recent experience with them has been excellent. The people from the counter to the plane have been professional and courteous. This is why I will fly with them more frequently.

LGA
CVG
Excellent 8.3

Plane was far too tight. Very uncomfortable for taller individuals.

Thu, Nov 30
ONT
ORD
13h 00m
Fri, Dec 1
ORD
ONT
17h 20m
Trip: 2 days
5.6OkayShow reviews
Overall 5.6 Okay
Based on 32923 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
DEN
ORD
Okay 5.3

Low cost

They make you pay for everything. Even peanuts. No entertainment.

DEN
SLC
Okay 5.6

Food, entertainment NA, didn’t use. Rest of flight uneventful, happy to say. Because this was so late due to previous leg of journey delayed, our planned transportation to hotel wa not available.

PBI
ISP
Mediocre 2.0

Was unable to make it

MIA
CVG
Good 6.0

More snack/food options

PHL
MIA
Excellent 10.0

Same as all the other airlines in my opinion. Just way more afreoadable.

Tue, Dec 5
ONT
ORD
13h 00m
Fri, Dec 8
ORD
ONT
17h 20m
Trip: 4 days
5.6OkayShow reviews
Overall 5.6 Okay
Based on 32923 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
LGA
MIA
Mediocre 3.6

Flight Very late , when departure already at night Uncomfortable seats $45 for a bag and I have drop it off myself after pay

PHL
MIA
Excellent 10.0

Same as all the other airlines in my opinion. Just way more afreoadable.

MCO
DEN
Okay 4.6

The seats were clean; the cabin looked very nice. The plane got me from point A to B safely. smoothest Lansing ever!

Flight was delayed 2.5 hours. No communication from the cockpit, 2 out of the 4 flight attendants we really crabby. Undersea storage was unusually small. I’m 5’8” and my knees were pressed against the seat in front of me and the seats are hard. My legs were numb for part of the trip.

MIA
ISP
Excellent 8.5

The terminal was empty. Plenty of seats. Boarding doesn't take long. Arrival at ISP is nice because it is small and empty.

DEN
ORD
Okay 5.3

Low cost

They make you pay for everything. Even peanuts. No entertainment.

Tue, May 22
ONT
ORD
9h 13m
Wed, May 30
ORD
ONT
17h 46m
Trip: 9 days
5.6OkayShow reviews
Overall 5.6 Okay
Based on 32923 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
DEN
SLC
Okay 5.6

Food, entertainment NA, didn’t use. Rest of flight uneventful, happy to say. Because this was so late due to previous leg of journey delayed, our planned transportation to hotel wa not available.

DEN
ORD
Excellent 10.0

On time. Very organized.

PVD
TPA
Excellent 9.3

Cheap, comfortable and friendly staff

Getting off the plane took forever on both legs.

MCO
DEN
Okay 4.6

The seats were clean; the cabin looked very nice. The plane got me from point A to B safely. smoothest Lansing ever!

Flight was delayed 2.5 hours. No communication from the cockpit, 2 out of the 4 flight attendants we really crabby. Undersea storage was unusually small. I’m 5’8” and my knees were pressed against the seat in front of me and the seats are hard. My legs were numb for part of the trip.

DEN
ORD
Okay 5.3

Low cost

They make you pay for everything. Even peanuts. No entertainment.

Fri, Feb 2
ONT
ORD
11h 13m
Sun, Feb 4
ORD
ONT
15h 12m
Trip: 3 days
5.6OkayShow reviews
Overall 5.6 Okay
Based on 32923 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
FSD
DEN
Okay 4.6

The scheduled plane had a mechanical problem so we deplaned for alternative plan. It took six long hours to get another plane in. Meantime passengers stood in line for hours to make other arrangements. It would have been appropriate for the airline to call in extra staff to help stranded passengers. We missed the scheduled connecting flight and a tour. We got in at 1:00 am, 12 hours later than planned. We had meetings next day and were very tired because we got in so late

MIA
ISP
Excellent 8.5

The terminal was empty. Plenty of seats. Boarding doesn't take long. Arrival at ISP is nice because it is small and empty.

DEN
ORD
Excellent 10.0

On time. Very organized.

MIA
CVG
Good 6.0

More snack/food options

DEN
ORD
Okay 5.3

Low cost

They make you pay for everything. Even peanuts. No entertainment.

Mon, Apr 9
ONT
ORD
23h 36m
Wed, Apr 11
ORD
ONT
12h 25m
Trip: 3 days
5.6OkayShow reviews
Overall 5.6 Okay
Based on 32923 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
PHL
MIA
Excellent 10.0

Same as all the other airlines in my opinion. Just way more afreoadable.

PBI
ISP
Mediocre 2.0

Was unable to make it

LGA
MIA
Mediocre 3.6

Flight Very late , when departure already at night Uncomfortable seats $45 for a bag and I have drop it off myself after pay

MCO
DEN
Okay 4.6

The seats were clean; the cabin looked very nice. The plane got me from point A to B safely. smoothest Lansing ever!

Flight was delayed 2.5 hours. No communication from the cockpit, 2 out of the 4 flight attendants we really crabby. Undersea storage was unusually small. I’m 5’8” and my knees were pressed against the seat in front of me and the seats are hard. My legs were numb for part of the trip.

FSD
DEN
Okay 4.6

The scheduled plane had a mechanical problem so we deplaned for alternative plan. It took six long hours to get another plane in. Meantime passengers stood in line for hours to make other arrangements. It would have been appropriate for the airline to call in extra staff to help stranded passengers. We missed the scheduled connecting flight and a tour. We got in at 1:00 am, 12 hours later than planned. We had meetings next day and were very tired because we got in so late

Wed, May 23
ONT
ORD
23h 52m
Wed, May 30
ORD
ONT
12h 13m
Trip: 8 days
5.6OkayShow reviews
Overall 5.6 Okay
Based on 32923 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
DEN
ORD
Okay 5.3

Low cost

They make you pay for everything. Even peanuts. No entertainment.

LGA
MIA
Mediocre 3.6

Flight Very late , when departure already at night Uncomfortable seats $45 for a bag and I have drop it off myself after pay

MIA
PHL
Okay 5.6

Flight was on time. The flight was fast and the crew was helpful and courteous

It was cramped. Couldn't recline back. Was only offered water

PVD
TPA
Excellent 9.3

Cheap, comfortable and friendly staff

Getting off the plane took forever on both legs.

MIA
CVG
Good 6.0

More snack/food options

Mon, Dec 25
ONT
ORD
11h 18m
Sat, Jan 6
ORD
ONT
24h 11m
Trip: 13 days
5.6OkayShow reviews
Overall 5.6 Okay
Based on 32923 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
FSD
DEN
Okay 4.6

The scheduled plane had a mechanical problem so we deplaned for alternative plan. It took six long hours to get another plane in. Meantime passengers stood in line for hours to make other arrangements. It would have been appropriate for the airline to call in extra staff to help stranded passengers. We missed the scheduled connecting flight and a tour. We got in at 1:00 am, 12 hours later than planned. We had meetings next day and were very tired because we got in so late

PVD
TPA
Excellent 9.3

Cheap, comfortable and friendly staff

Getting off the plane took forever on both legs.

LGA
MIA
Mediocre 3.6

Flight Very late , when departure already at night Uncomfortable seats $45 for a bag and I have drop it off myself after pay

DEN
ORD
Excellent 10.0

On time. Very organized.

PHL
MIA
Excellent 10.0

Same as all the other airlines in my opinion. Just way more afreoadable.

Fri, Feb 16
ONT
ORD
21h 56m
Tue, Feb 20
ORD
ONT
13h 57m
Trip: 5 days
5.6OkayShow reviews
Overall 5.6 Okay
Based on 32923 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
PBI
ISP
Mediocre 2.0

Was unable to make it

MCO
DEN
Okay 4.6

The seats were clean; the cabin looked very nice. The plane got me from point A to B safely. smoothest Lansing ever!

Flight was delayed 2.5 hours. No communication from the cockpit, 2 out of the 4 flight attendants we really crabby. Undersea storage was unusually small. I’m 5’8” and my knees were pressed against the seat in front of me and the seats are hard. My legs were numb for part of the trip.

MIA
ISP
Excellent 8.5

The terminal was empty. Plenty of seats. Boarding doesn't take long. Arrival at ISP is nice because it is small and empty.

MIA
PHL
Okay 5.6

Flight was on time. The flight was fast and the crew was helpful and courteous

It was cramped. Couldn't recline back. Was only offered water

DEN
SLC
Okay 5.6

Food, entertainment NA, didn’t use. Rest of flight uneventful, happy to say. Because this was so late due to previous leg of journey delayed, our planned transportation to hotel wa not available.

Thu, Feb 15
ONT
ORD
12h 57m
Mon, Feb 19
ORD
ONT
24h 11m
Trip: 5 days
5.6OkayShow reviews
Overall 5.6 Okay
Based on 32923 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
LGA
MIA
Mediocre 3.6

Flight Very late , when departure already at night Uncomfortable seats $45 for a bag and I have drop it off myself after pay

PHL
MIA
Excellent 10.0

Same as all the other airlines in my opinion. Just way more afreoadable.

MCO
DEN
Okay 4.6

The seats were clean; the cabin looked very nice. The plane got me from point A to B safely. smoothest Lansing ever!

Flight was delayed 2.5 hours. No communication from the cockpit, 2 out of the 4 flight attendants we really crabby. Undersea storage was unusually small. I’m 5’8” and my knees were pressed against the seat in front of me and the seats are hard. My legs were numb for part of the trip.

DEN
ORD
Excellent 10.0

On time. Very organized.

MIA
CVG
Good 6.0

More snack/food options

Thu, May 31
ONT
ORD
9h 13m
Mon, Jun 4
ORD
ONT
12h 13m
Trip: 5 days
5.6OkayShow reviews
Overall 5.6 Okay
Based on 32923 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
DEN
SLC
Okay 5.6

Food, entertainment NA, didn’t use. Rest of flight uneventful, happy to say. Because this was so late due to previous leg of journey delayed, our planned transportation to hotel wa not available.

MIA
ISP
Excellent 8.5

The terminal was empty. Plenty of seats. Boarding doesn't take long. Arrival at ISP is nice because it is small and empty.

MIA
PHL
Okay 5.6

Flight was on time. The flight was fast and the crew was helpful and courteous

It was cramped. Couldn't recline back. Was only offered water

DEN
ORD
Excellent 10.0

On time. Very organized.

MIA
CVG
Good 6.0

More snack/food options

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