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

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Sat 11/18
Sat 11/25
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Good to Know

Low Season:
September
Best time to beat the crowds
3%
expected price decrease
High Season:
March
Most popular time to fly
2%
expected price increase
Average Price:
$368
(avg. price over the last 2 weeks)
Good Deal:
$259
or less (round trip)

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

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 $258 or less.
The cheapest flight from Chicago O'Hare International to Ontario was found 46 days before departure, on average.
Book at least 3 weeks before departure in order to get a below-average price.
High season is considered to be February, March and April. The cheapest month to fly is September.
Morning departure is around 25% more expensive 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 Chicago O'Hare International to Ontario Flights

How long does a flight from Chicago O'Hare International to Ontario take?
An average nonstop flight takes 6h 49m, covering a distance of 1697 miles.
Which airlines provide the cheapest flights from Chicago O'Hare International to Ontario?
In the past 3 days, the cheapest round-trip tickets were found on Multiple Airlines ($112), Frontier ($126) and United ($380).
Do I need a passport to fly between Chicago O'Hare International and Ontario?
No.
What’s the cheapest day of the week to fly Chicago O'Hare International to Ontario?
For Chicago O'Hare International to Ontario, Tuesday is the cheapest day to fly on average and Monday is the most expensive. Flying from Ontario back to Chicago O'Hare International, the best deals are generally found on Monday, with Thursday being the most expensive.

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

Airports
Origin
Chicago
$112
only
$112
Destination
Ontario
$112
only
$112
Tue, Dec 5
ORD
ONT
8h 14m
Thu, Dec 7
ONT
ORD
20h 17m
Trip: 3 days
Overall 0.0 Poor
Based on 0 reviews
Tue, Jan 16
ORD
ONT
15h 12m
Tue, Jan 23
ONT
ORD
12h 57m
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
PHL
MIA
Excellent 10.0

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

MIA
CVG
Good 6.0

More snack/food options

DEN
ORD
Excellent 10.0

On time. Very organized.

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.

Thu, Nov 30
ORD
ONT
8h 14m
Sat, Dec 2
ONT
ORD
21h 10m
Trip: 3 days
Overall 0.0 Poor
Based on 0 reviews
Wed, Jan 31
ORD
ONT
24h 11m
Thu, Feb 8
ONT
ORD
12h 57m
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
ORD
Excellent 10.0

On time. Very organized.

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.

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

DEN
ORD
Okay 5.3

Low cost

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

PVD
TPA
Excellent 9.3

Cheap, comfortable and friendly staff

Getting off the plane took forever on both legs.

Tue, Feb 6
ORD
ONT
15h 12m
Tue, Feb 13
ONT
ORD
12h 57m
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
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

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.

PBI
ISP
Mediocre 2.0

Was unable to make it

Fri, Dec 1
ORD
ONT
24h 05m
Sun, Dec 3
ONT
ORD
20h 17m
Trip: 3 days
Overall 0.0 Poor
Based on 0 reviews
Sat, Mar 31
ORD
ONT
7h 57m
Sat, Apr 7
ONT
ORD
6h 47m
Trip: 8 days
7.0GoodShow reviews
Overall 7.0 Good
Based on 51141 reviews
Overall
7.2
Boarding
7.3
Comfort
6.9
Crew
7.7
Entertainment
6.5
Food
6.4
EWR
PBI
Okay 4.6

Arrived on time

Distance between gates

SFO
SAN
Excellent 8.0

Boarding was very easy , no long line , trip was on time .

EWR
NRT
Mediocre 3.6

There was a flight attendant who was a little rude.

DSM
IAH
Excellent 10.0

Boarding seemed smother than usual. I had an issue with a large back pack that wouldn't fit in the overhead due to a smaller plane travelling to Houston from Des Moines, Flight attendant was extremely helpful as it was expensive camera equipment and was able to stow it so that i didn't have to check it at the door. Most appreciated their sensitivity.

DCA
IAH
Good 7.3

Crew was great and helpful!

Not enough options for people with celiac.

Thu, Feb 8
ORD
ONT
8h 21m
Mon, Feb 12
ONT
ORD
21h 56m
Trip: 5 days
Overall 0.0 Poor
Based on 0 reviews
Thu, Nov 30
ORD
ONT
13h 49m
Sun, Dec 3
ONT
ORD
13h 00m
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
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.

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

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

Mon, Apr 2
ORD
ONT
6h 49m
Fri, Apr 6
ONT
ORD
6h 15m
Trip: 5 days
7.2GoodShow reviews
Overall 7.2 Good
Based on 25178 reviews
Overall
7.3
Boarding
7.5
Comfort
7.1
Crew
7.8
Entertainment
6.7
Food
6.6
LAX
MIA
Good 7.6

Movies, clean, efficient

Paying of my small Checked bag

LAX
RNO
Mediocre 2.0

Not a single part has a positive remark

Well - this partner of westjet was terrible. The amount of re direction to get to the final terminal was absurd .. that's just my venting My real problem is that then "crew" or team that represent s the American Airlines / compass part was just useless. A hand full of people - myself included didn't get a chance to board the plane as they didn't make any announcements. Beyond disappointing. When you check in they take your cell phone "in case " well no call no txt no nothing. It was a joke the level of service No apologies or anything just a group of any tired patrons getting the worst customer experience. I'll never EVER book a flight that has anything to do with American Airlines or its partners

CHO
ORD
Good 7.6

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

MCI
DFW
Mediocre 2.0

I cancelled this flight months ago, yet it was still in your records

BDL
CLT
Okay 4.0

No baggage controls from seat 18 to 28 no bags would fit. As we exited all the front rows we're waiting to get there bags stored in back of planes overhead bins. That's just not right, especially when they charge us extra to take a bag for overhead bins storage.

Thu, Nov 30
ORD
ONT
13h 49m
Sun, Dec 3
ONT
ORD
13h 00m
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
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.

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

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.

PHL
MIA
Excellent 10.0

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

Thu, Feb 8
ORD
ONT
8h 21m
Mon, Feb 12
ONT
ORD
21h 56m
Trip: 5 days
Overall 0.0 Poor
Based on 0 reviews
Thu, Dec 14
ORD
ONT
13h 36m
Fri, Dec 15
ONT
ORD
21h 18m
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
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.

PVD
TPA
Excellent 9.3

Cheap, comfortable and friendly staff

Getting off the plane took forever on both legs.

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

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.

Wed, Apr 18
ORD
ONT
12h 25m
Mon, Apr 23
ONT
ORD
23h 36m
Trip: 6 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
PVD
TPA
Excellent 9.3

Cheap, comfortable and friendly staff

Getting off the plane took forever on both legs.

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
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.

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

Tue, May 22
ORD
ONT
7h 03m
Tue, Jun 5
ONT
ORD
9h 13m
Trip: 15 days
Overall 0.0 Poor
Based on 0 reviews
Tue, Mar 6
ORD
ONT
15h 08m
Mon, Apr 30
ONT
ORD
23h 40m
Trip: 55 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
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.

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

PBI
ISP
Mediocre 2.0

Was unable to make it

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.

Tue, Mar 6
ORD
ONT
15h 08m
Tue, Mar 13
ONT
ORD
12h 55m
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
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

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
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.

PVD
TPA
Excellent 9.3

Cheap, comfortable and friendly staff

Getting off the plane took forever on both legs.

Sun, Dec 31
ORD
ONT
13h 35m
Tue, Jan 9
ONT
ORD
12h 57m
Trip: 10 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
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.

PHL
MIA
Excellent 10.0

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

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
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.

Fri, May 4
ORD
ONT
12h 13m
Tue, May 8
ONT
ORD
9h 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
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
CVG
Good 6.0

More snack/food options

PBI
ISP
Mediocre 2.0

Was unable to make it

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.

Tue, Jan 9
ORD
ONT
15h 12m
Tue, Jan 16
ONT
ORD
12h 57m
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
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

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.

PVD
TPA
Excellent 9.3

Cheap, comfortable and friendly staff

Getting off the plane took forever on both legs.

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.

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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.