Find Cheap Flights from Ontario to Milwaukee-Mitchell (ONT - MKE)

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Wed 1/24
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Good to Know

Average Price:
$424
(avg. price over the last 2 weeks)
Good Deal:
$317
or less (round trip)

When to Book Flights from Ontario to Milwaukee-Mitchell

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 $316 or less.
The cheapest flight from Ontario to Milwaukee-Mitchell was found 44 days before departure, on average.
Book at least 1 week before departure in order to get a below-average price.
On average*, there is no price difference when choosing to fly in the morning or the evening on this flight route.
*Average of the lowest prices shown in KAYAK’s search results for departures within the next 30 days

FAQs for Booking Ontario to Milwaukee-Mitchell Flights

How long does a flight from Ontario to Milwaukee-Mitchell take?
An average nonstop flight takes 5h 25m, covering a distance of 1709 miles.
Which airlines provide the cheapest flights from Ontario to Milwaukee-Mitchell?
In the past 3 days, the cheapest round-trip tickets were found on Frontier ($144), Multiple Airlines ($234) and American Airlines ($312).
Do I need a passport to fly between Ontario and Milwaukee-Mitchell?
No.
What’s the cheapest day of the week to fly Ontario to Milwaukee-Mitchell?
For Ontario to Milwaukee-Mitchell, Tuesday is the cheapest day to fly on average and Wednesday is the most expensive. Flying from Milwaukee-Mitchell back to Ontario, the best deals are generally found on Friday, with Tuesday being the most expensive.

Book cheap flights from Ontario to Milwaukee-Mitchell (round-trip)

Airports
Origin
Ontario
$144
only
$144
Destination
Milwaukee
$144
only
$144
Tue, Apr 17
ONT
MKE
11h 24m
Tue, May 8
MKE
ONT
6h 07m
Trip: 22 days
5.7OkayShow reviews
Overall 5.7 Okay
Based on 33623 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
SLC
ATL
Excellent 10.0

I had my own row the whole trip.

MIA
PHL
Excellent 8.0

Seats don’t recline which is nice for tall people who don’t like having their knees smashed

You have to pay extra for a carry on, but I was able to bring my backpack on full of stuff for free so that’s good.

SFO
ATL
Mediocre 2.0

Nothing

Everything was horrible!

SFO
ATL
Mediocre 2.0

From checkin to in flight service. It was horrible. The 5 hours flight with nothing, no tv, movie, nor complimentary snacks or drink. Everything need to be purchased, even a small orange juice cup will cost about $4. The only free is a cup of ice water. When I asked for another water, they told me they only give 2 cups of 2 waters. If I need more, I need to purchase it. Omg! Really? I seriously think they hire those stewardesswith a minimum wage and they have to sale stuff for commission. Why would they need 5 stewardesses when they didn’t even serve.

MCO
TTN
Okay 4.0

Quick departure and TTN

Paying for seats for no reason other than profit when there were lots empty- paying more for carry on than checked bags- how about a free cup of coffee? Would cost u a penny

Tue, May 15
ONT
MKE
5h 28m
Wed, May 16
MKE
ONT
15h 28m
Trip: 2 days
Overall 0.0 Poor
Based on 0 reviews
Tue, May 8
ONT
MKE
11h 30m
Tue, May 15
MKE
ONT
6h 07m
Trip: 8 days
5.7OkayShow reviews
Overall 5.7 Okay
Based on 33623 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
MCO
TTN
Okay 4.0

Quick departure and TTN

Paying for seats for no reason other than profit when there were lots empty- paying more for carry on than checked bags- how about a free cup of coffee? Would cost u a penny

MCI
DEN
Excellent 10.0

Staff was great. Baggage and service was handled well.

SFO
ATL
Mediocre 2.0

Nothing

Everything was horrible!

AUS
IAD
Excellent 8.0

I reserved seats for both flights @ 13.00 per seat (2) and never got the seats I reserved.

ATL
LAX
Excellent 10.0

Very like it !

Thu, Feb 22
ONT
MKE
7h 24m
Mon, Feb 26
MKE
ONT
6h 56m
Trip: 5 days
7.2GoodShow reviews
Overall 7.2 Good
Based on 27489 reviews
Overall
7.3
Boarding
7.5
Comfort
7.1
Crew
7.8
Entertainment
6.7
Food
6.6
CLT
CHO
Okay 5.0

On time. Jet rather than a turbo-prop plane. Quick flight.

Somewhat haphazard boarding. Not even a cookie for a snack.

CLT
LAX
Good 6.0

Staff was friendly and genuine

They didn’t load enough “for purchase” food. This was a six hour flight! They has no options left excepthummus and chips. This is second flight on American this year where they don’t supply the plane appropriately.

MIA
SJU
Good 6.0

Last minute cancellation and reschedule if original flight with 20 people hounding the gate for standby status. Craziness. These last minute revisions mist stop

DFW
DCA
Excellent 10.0

Fast and efficient service

Not applicable

DEN
CLT
Good 6.3

On time. Efficient boarding.

Stingy with the cookies. Somewhat uncomfortable seating. But what can anyone expect anymore?

Tue, Jan 30
ONT
MKE
6h 33m
Fri, Feb 2
MKE
ONT
7h 28m
Trip: 4 days
7.0GoodShow reviews
Overall 7.0 Good
Based on 53951 reviews
Overall
7.2
Boarding
7.4
Comfort
6.9
Crew
7.7
Entertainment
6.5
Food
6.4
SEA
SFO
Excellent 9.3

Nothing great, nothing bad. took off and landed on time.

paced seats, nit enough room for carry ons.

BRU
IAD
Good 7.0

Good food, entertainment options, communication from pilot

none of the flight attendants seemed to be friendly- literally all of them were neutral or slightly rude at best. Not impressed.

SFO
HND
Excellent 8.0

economy plua has a reasonable amount of room, good food for breakfast, nice movies in flight.

they canceled our flight to hanaeda and instead had us take an hour later flight to narita which is a 1 1/2 hour $30 bus ride away which they don’t pay for. this caused us to miss our connecting flight to Asahikawa, the last flight of the day. The connection time allowed was not nearly enough even if the plane had not been an hour late and there are no flights to asahikawa from narita. yo have to transfer to hanaeda. remind me not to fly United to Tokyo again as I’m pretty sure the flight was canceled because it was not full enough. Even the narita flight with all the hanaeda passengers rebooked on it was not full. So i suspect this may be a relatively common occurance on the hanaeda flight.

STL
IAD
Excellent 9.3

Efficient crew. It

It was good overall.

TPA
DEN
Excellent 8.0

Service, boarding, pilot capability; all positive things with no complaints. And yeah, I got the whole can of soda.

As a tall fellow of 6'3'', Seats on united are very close together and knees are constantly under pressure from the seat in front.

Tue, Mar 27
ONT
MKE
20h 59m
Fri, Mar 30
MKE
ONT
15h 54m
Trip: 4 days
5.7OkayShow reviews
Overall 5.7 Okay
Based on 33623 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
AUS
IAD
Excellent 8.0

I reserved seats for both flights @ 13.00 per seat (2) and never got the seats I reserved.

MIA
PHL
Excellent 8.0

Seats don’t recline which is nice for tall people who don’t like having their knees smashed

You have to pay extra for a carry on, but I was able to bring my backpack on full of stuff for free so that’s good.

SFO
ATL
Mediocre 2.0

Nothing

Everything was horrible!

MCO
GRR
Excellent 10.0

Early departure. Non-stop.

MCI
DEN
Excellent 10.0

Staff was great. Baggage and service was handled well.

Thu, Feb 15
ONT
MKE
6h 04m
Mon, Feb 19
MKE
ONT
6h 37m
Trip: 5 days
7.2GoodShow reviews
Overall 7.2 Good
Based on 27489 reviews
Overall
7.3
Boarding
7.5
Comfort
7.1
Crew
7.8
Entertainment
6.7
Food
6.6
CLE
ORD
Excellent 9.3

Like my AA rides > 90% of the time. The usual prob is sketchy gogo service.

Nogo gogo

SAN
PHX
Excellent 9.0

The friendly and attentive flight staff.

CLT
LAX
Good 6.0

Staff was friendly and genuine

They didn’t load enough “for purchase” food. This was a six hour flight! They has no options left excepthummus and chips. This is second flight on American this year where they don’t supply the plane appropriately.

LAX
HNL
Excellent 10.0

Great vegetarian meal.

DFW
DCA
Excellent 10.0

Fast and efficient service

Not applicable

Fri, Jun 1
ONT
MKE
5h 35m
Sun, Jun 3
MKE
ONT
6h 07m
Trip: 3 days
Overall 0.0 Poor
Based on 0 reviews
Thu, May 17
ONT
MKE
11h 29m
Sun, May 20
MKE
ONT
6h 07m
Trip: 4 days
5.7OkayShow reviews
Overall 5.7 Okay
Based on 33623 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
MCI
DEN
Excellent 10.0

Staff was great. Baggage and service was handled well.

SFO
ATL
Mediocre 2.0

From checkin to in flight service. It was horrible. The 5 hours flight with nothing, no tv, movie, nor complimentary snacks or drink. Everything need to be purchased, even a small orange juice cup will cost about $4. The only free is a cup of ice water. When I asked for another water, they told me they only give 2 cups of 2 waters. If I need more, I need to purchase it. Omg! Really? I seriously think they hire those stewardesswith a minimum wage and they have to sale stuff for commission. Why would they need 5 stewardesses when they didn’t even serve.

SFO
ATL
Mediocre 2.0

Nothing

Everything was horrible!

MKE
MCO
Okay 4.0

The staff was nice

The seats are just awful

ATL
LAX
Excellent 10.0

Very like it !

Sun, Mar 11
ONT
MKE
20h 59m
Fri, Apr 13
MKE
ONT
15h 50m
Trip: 33 days
5.7OkayShow reviews
Overall 5.7 Okay
Based on 33623 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
CLT
PHL
Excellent 10.0

Crew took great care of passengers as we were delayed 2 hours on the tarmac for deicing. Not their fault but the company gave passengers a $50 certificate for our late arrival.

MKE
MCO
Okay 4.0

The staff was nice

The seats are just awful

SLC
ATL
Excellent 10.0

I had my own row the whole trip.

MCO
GRR
Excellent 10.0

Early departure. Non-stop.

SFO
ATL
Mediocre 2.0

From checkin to in flight service. It was horrible. The 5 hours flight with nothing, no tv, movie, nor complimentary snacks or drink. Everything need to be purchased, even a small orange juice cup will cost about $4. The only free is a cup of ice water. When I asked for another water, they told me they only give 2 cups of 2 waters. If I need more, I need to purchase it. Omg! Really? I seriously think they hire those stewardesswith a minimum wage and they have to sale stuff for commission. Why would they need 5 stewardesses when they didn’t even serve.

Mon, Jul 2
ONT
MKE
5h 28m
Sat, Jul 7
MKE
ONT
6h 24m
Trip: 6 days
7.2GoodShow reviews
Overall 7.2 Good
Based on 27489 reviews
Overall
7.3
Boarding
7.5
Comfort
7.1
Crew
7.8
Entertainment
6.7
Food
6.6
PHX
EWR
Good 6.0

Bought a sandwich which was old ...

SAN
PHX
Excellent 9.0

The friendly and attentive flight staff.

DFW
LAX
Excellent 10.0

Overall good service.

LAX
HNL
Excellent 10.0

Great vegetarian meal.

DFW
DCA
Excellent 10.0

Fast and efficient service

Not applicable

Thu, Jul 26
ONT
MKE
11h 29m
Mon, Jul 30
MKE
ONT
15h 14m
Trip: 5 days
5.7OkayShow reviews
Overall 5.7 Okay
Based on 33623 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
MIA
PHL
Excellent 8.0

Seats don’t recline which is nice for tall people who don’t like having their knees smashed

You have to pay extra for a carry on, but I was able to bring my backpack on full of stuff for free so that’s good.

SLC
ATL
Excellent 10.0

I had my own row the whole trip.

MCO
TTN
Okay 4.0

Quick departure and TTN

Paying for seats for no reason other than profit when there were lots empty- paying more for carry on than checked bags- how about a free cup of coffee? Would cost u a penny

SFO
ATL
Mediocre 2.0

Nothing

Everything was horrible!

MKE
MCO
Okay 4.0

The staff was nice

The seats are just awful

Wed, Jan 31
ONT
MKE
5h 25m
Thu, Feb 1
MKE
ONT
6h 31m
$1022
Trip: 2 days
7.8GoodShow reviews
Overall 7.8 Good
Based on 15421 reviews
Overall
8.0
Boarding
8.1
Comfort
7.7
Crew
8.4
Entertainment
7.5
Food
7.3
JFK
CUN
Okay 4.0

The flight was delayed for 4 hours.

ATL
SJD
Excellent 8.0

On time departure, actually got to Cabo early.

The seat in front of mine had a broken reclining lock mechanism and the passenger kept trying to switch from recline to sitting up and it wouldn't latch in the upright position, so he kept jerking the seatback up and down for the entire 4 hour flight. Also the rows were so tight, and seatbacks were so close together, that the reclining seat in front of me was 6 inches from my face.

DEN
SLC
Mediocre 2.0

Nothing!

Everything

SJD
ATL
Good 7.6

Our Delta plane was brand spanking new. Everything worked and the inflight entertainment system was fantastic with many movies to choose from, free headphones, games, tv shows, etc. The crew was polite and the seating at least as comfortable as expected for a 4 hour flight.

The restrooms in the rear of the plane were remarkably small, even by airline standards. I'm a somewhat larger person and I fit, but I know a lot of people who would literally not be able to fit on the toilet without touching both of the sidewalls or risk getting stuck in there. The boarding process at San Jose Del Cabo was the most ridiculous setup I've ever experienced. There were numerous flights boarding out of the same gates and at least 3 or 4 lines for different destinations forming on a ramp just outside the gates. There were guys with signs trying to herd people into the correct lines and then loading the people onto buses which took you out to the planes. The planes were loading from both the front and rear doors and people were getting tangled up inside because of the haphazard loading process. Very easy for a person to end up on an incorrect plane!!

ORD
ATL
Excellent 10.0

My flight was great. Boarding was easy and the seats were comfortable.

Thu, Jul 26
ONT
MKE
11h 29m
Sun, Jul 29
MKE
ONT
6h 05m
Trip: 4 days
5.7OkayShow reviews
Overall 5.7 Okay
Based on 33623 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
MKE
MCO
Okay 4.0

The staff was nice

The seats are just awful

SLC
ATL
Excellent 10.0

I had my own row the whole trip.

ATL
LAX
Excellent 10.0

Very like it !

SFO
ATL
Mediocre 2.0

From checkin to in flight service. It was horrible. The 5 hours flight with nothing, no tv, movie, nor complimentary snacks or drink. Everything need to be purchased, even a small orange juice cup will cost about $4. The only free is a cup of ice water. When I asked for another water, they told me they only give 2 cups of 2 waters. If I need more, I need to purchase it. Omg! Really? I seriously think they hire those stewardesswith a minimum wage and they have to sale stuff for commission. Why would they need 5 stewardesses when they didn’t even serve.

MCO
GRR
Excellent 10.0

Early departure. Non-stop.

Thu, Apr 5
ONT
MKE
9h 13m
Sun, Apr 8
MKE
ONT
7h 02m
Trip: 4 days
7.2GoodShow reviews
Overall 7.2 Good
Based on 27489 reviews
Overall
7.3
Boarding
7.5
Comfort
7.1
Crew
7.8
Entertainment
6.7
Food
6.6
DFW
LAX
Excellent 10.0

Overall good service.

SAN
PHX
Excellent 9.0

The friendly and attentive flight staff.

CLE
ORD
Excellent 9.3

Like my AA rides > 90% of the time. The usual prob is sketchy gogo service.

Nogo gogo

CLT
CHO
Okay 5.0

On time. Jet rather than a turbo-prop plane. Quick flight.

Somewhat haphazard boarding. Not even a cookie for a snack.

LAX
HNL
Excellent 10.0

Great vegetarian meal.

Tue, Jun 26
ONT
MKE
11h 29m
Sat, Jun 30
MKE
ONT
15h 28m
Trip: 5 days
5.7OkayShow reviews
Overall 5.7 Okay
Based on 33623 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
MIA
PHL
Excellent 8.0

Seats don’t recline which is nice for tall people who don’t like having their knees smashed

You have to pay extra for a carry on, but I was able to bring my backpack on full of stuff for free so that’s good.

SLC
ATL
Excellent 10.0

I had my own row the whole trip.

MCI
DEN
Excellent 10.0

Staff was great. Baggage and service was handled well.

SFO
ATL
Mediocre 2.0

From checkin to in flight service. It was horrible. The 5 hours flight with nothing, no tv, movie, nor complimentary snacks or drink. Everything need to be purchased, even a small orange juice cup will cost about $4. The only free is a cup of ice water. When I asked for another water, they told me they only give 2 cups of 2 waters. If I need more, I need to purchase it. Omg! Really? I seriously think they hire those stewardesswith a minimum wage and they have to sale stuff for commission. Why would they need 5 stewardesses when they didn’t even serve.

CLT
PHL
Excellent 10.0

Crew took great care of passengers as we were delayed 2 hours on the tarmac for deicing. Not their fault but the company gave passengers a $50 certificate for our late arrival.

Show more results

Ontario to Milwaukee-Mitchell Flight Information

Flights Arrive in Milwaukee-Mitchell
Flights Depart from Ontario
Flight Price $144
Distance 1709 miles
Airlines Frontier, American Airlines, United, Delta
*
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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.