ONT - MKE

$198 Find Cheap Flights from Ontario to Milwaukee

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Ontario to Milwaukee departing on 7/7. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

KAYAK searches hundreds of travel sites at once for deals on flights to Milwaukee

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Ontario to Milwaukee, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Ontario to Milwaukee, as well as popular online travel agencies
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Everything you should know

Cheapest round-trip
$304
Typical prices: $374-$326
Delta
Thu 9/10Wed 9/16
ONT - MKE • 1 stop
Cheapest one-way
$198
Typical prices: $218-$304
Delta
Tue 7/7
ONT - MKE • 1 stop
Top airlines
Cheapest • from $382 (round-trip)
Best reviews • 8.0 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
Nonstop flights
Not available
There are currently no direct flights between Ontario and Milwaukee. You'll need at least 1 connection.
Insights
Insights
Insights
Insights
Top layover airports
Cheapest • Avg $338 (round-trip)
Shortest trip • 6h 01m (one-way)
Insights
Insights
Insights
Insights
When to travel
Cheapest • 18% price drop
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
Start a new search
KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to Milwaukee!
Flight Deals
Booking Insights
Flight Deals

Cheap Flights from Ontario to Milwaukee (ONT-MKE)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Ontario to Milwaukee that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Ontario to Milwaukee

Thu, Sep 10 - Wed, Sep 16
Delta Logo
12:00 pm - 11:25 pm
ONT
-
MKE
9h 25m
1 stop
Delta Logo
5:30 am - 10:47 am
MKE
-
ONT
7h 17m
1 stop
$304Delta
Thu, Sep 10 - Wed, Sep 16
American Airlines Logo
7:11 pm - 8:01 am
ONT
-
MKE
10h 50m
2 stops
American Airlines Logo
7:00 am - 1:25 pm
MKE
-
ONT
8h 25m
1 stop
$342American Airlines
Thu, Aug 13 - Fri, Aug 21
Delta Logo
12:00 pm - 11:53 pm
ONT
-
MKE
9h 53m
1 stop
Delta Logo
5:34 am - 10:42 am
MKE
-
ONT
7h 08m
1 stop
$382Delta
Thu, Sep 10 - Wed, Sep 16
Southwest Logo
5:15 am - 2:25 pm
ONT
-
MKE
7h 10m
2 stops
Southwest Logo
7:10 am - 12:40 pm
MKE
-
ONT
7h 30m
2 stops
$388Southwest
Tue, Jul 21 - Tue, Aug 4
Southwest Logo
4:10 pm - 12:55 am
ONT
-
MKE
6h 45m
1 stop
Southwest Logo
5:00 pm - 8:55 pm
MKE
-
ONT
5h 55m
1 stop
$395Southwest
Sat, Jul 18 - Wed, Jul 22
Southwest Logo
2:20 pm - 11:05 pm
ONT
-
MKE
6h 45m
1 stop
Southwest Logo
5:00 am - 9:35 am
MKE
-
ONT
6h 35m
1 stop
$399Southwest
Tue, Jul 14 - Tue, Jul 21
Southwest Logo
1:20 pm - 10:30 pm
ONT
-
MKE
7h 10m
2 stops
Southwest Logo
6:20 pm - 10:20 pm
MKE
-
ONT
6h 00m
1 stop
$400Southwest
Tue, Jul 21 - Tue, Aug 4
American Airlines Logo
1:11 pm - 9:38 pm
ONT
-
MKE
6h 27m
1 stop
American Airlines Logo
6:40 pm - 11:59 pm
MKE
-
ONT
7h 19m
1 stop
$403American Airlines
Sat, Jul 18 - Wed, Jul 22
Southwest Logo
2:20 pm - 11:05 pm
ONT
-
MKE
6h 45m
1 stop
Southwest Logo
5:00 am - 11:30 am
MKE
-
ONT
8h 30m
2 stops
$404Southwest
Tue, Jul 14 - Tue, Jul 21
Southwest Logo
1:20 pm - 10:30 pm
ONT
-
MKE
7h 10m
2 stops
Southwest Logo
4:10 pm - 10:20 pm
MKE
-
ONT
8h 10m
2 stops
$405Southwest
Booking Insights

KAYAK's insights & trends for Ontario to Milwaukee flights

Get data-powered insights and trends into flights from Ontario to Milwaukee to help you find the cheapest flights, the best time to fly and much more.

How much is a round-trip flight from Ontario to Milwaukee?

This analysis is based on the cheapest round-trip price found on KAYAK in the last 12 months by searching for a flight from Ontario to Milwaukee departing in September.

What is the cheapest month to fly from Ontario to Milwaukee?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Ontario to Milwaukee, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from Ontario to Milwaukee is September, where tickets cost $366 (return) on average. On the other hand, the most expensive months are January and July, where the average cost of round-trip tickets is $557 and $486 respectively.

Good to know

Low seasonFebruary
Cheapest flight$198
Best time to beat the crowds with an average 5% drop in price.
Most popular time to fly with an average 7% increase in price.
Flight from Ontario to Milwaukee

When to book flights from Ontario to Milwaukee

Are your dates flexible? Find out the best times to travel from Ontario to Milwaukee based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking flights from Ontario to Milwaukee

  • What is the cheapest flight from Ontario to Milwaukee?

    In the last 5 days, the lowest price for a flight from Ontario to Milwaukee was $198 for a one-way ticket and $382 for a round-trip.

  • Do I need a passport to fly between Ontario and Milwaukee?

    A passport is not required to fly from Ontario to Milwaukee.

  • Which aircraft models fly most regularly from Ontario to Milwaukee?

    We unfortunately don’t have that data for this specific route.

  • Which airline alliances offer flights from Ontario to Milwaukee?

    SkyTeam, Star Alliance, and oneworld are the airline alliances operating flights between Ontario and Milwaukee, with SkyTeam being the most commonly used for this route.

  • Which is the best airline for flights from Ontario to Milwaukee, Southwest or Delta?

    The two airlines most popular with KAYAK users for flights from Ontario to Milwaukee are Southwest and Delta. With an average price for the route of $461 and an overall rating of 8.0, Southwest is the most popular choice. Delta is also a great choice for the route, with an average price of $476 and an overall rating of 7.8.

  • How does KAYAK find such low prices on flights from Ontario to Milwaukee?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Ontario to Milwaukee.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Ontario to Milwaukee?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Milwaukee from Ontario is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Ontario to Milwaukee?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Milwaukee with an airline and back to Ontario with another airline. Booking your flights between Ontario and MKE can sometimes prove cheaper using this method.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Ontario to Milwaukee?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Milwaukee from Ontario up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top 4 airlines serving from Ontario to Milwaukee

 
See real verified KAYAK customer reviews for airlines flying from Ontario to Milwaukee. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Ontario to Milwaukee? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
8.0
SouthwestOverall score based on 4258 reviews
8.1Boarding
8.6Crew
8.0Comfort
7.0Food
7.5Entertainment
Airline reviews

Was fine, delayed and feels like southwest is always late

6.0 GoodAnonymous, Jun 2026
SMF - LAS
Read more Southwest reviews

Was fine, delayed and feels like southwest is always late

The entire experience from boarding to landing was amazing! The crew were very friendly. Will definitely be back.

Delayed flight, lack of information, boarding process is a mess as is the carryon luggage causing issues when leaving the plane….just a poor experience.

Comfortable. Easy. No problems. Just wish they had gf options for snacks.

The crew was very kind and made going to Hawaii relaxing and fun to look forward to! Thank you Southwest for a pleasant flight!

The entire travel day was a disaster from beginning to end. Woke up at two in the morning to make it to San Juan airport in time for a 5:30 am flight to Milwaukee which connected in Baltimore. Massive delays lead to me missing original connection out of Baltimore. Sixteen hours of delays/rebooking/layover time later, arrived in Milwaukee to find that only one of two checked bags made it there (despite the fact that Southwest brought another 737 jet to San Juan to fly us out to our original Baltimore connection—-not squeezed into another booked flight). The flight from Baltimore to Milwaukee was barely half full, so there was no logical reason to ship my bags out of Baltimore on a different flight to Chicago to then ship to Milwaukee. Southwest decided that my bags should not have been on the same connecting flight I WAS ON to Milwaukee, and then proceeded to accidentally leave my larger bag with the important items in Chicago. Terrible logic and support all around. Extremely angered and disappointed with SW. What a clownish operation your company has become!

Terrible. Even though there’s assigned seating now, they are still the slowest boarding airline of anyone.

It was good from LAX to Phoenix, But the connection in Phoenix to Tulsa was not that great. The staff on both flights were great. The choice of free entertainment was ok nothing to brag about. The 45 min delay because of some electrical issue wasn't great from Phoenix to Tulsa. We sat there with hardly any air, The seat I had was between windows so the side of the plane pushed in on you. My being a bigger man it then made the seating area uncomfortable. The seats on the plane had no power to connect to recharge your phone or anything. I would recommend that they should look into a slot or clamp to hold your phone to enjoy while watching the entertainment choices hands-free. Also make it possible to raise the inner seat by the window be able to raise the arm rest up to make more room for larger people to set more comfortably. I would also say other then that stop price gouging the airfare or nickel and diming everything. Not fair for people having to fly for emergencies and be paying for higher prices due to the season or holidays. Your making your money either way and the cost of flying is still going to be the same regardless if there's 100 people or 200 people.

Southwest was greaat! The most expensive but the least upsetting for those we were flying to see.

Boarding was easy. The seats are small and fairly uncomfortable

While they turned off most cabin lights to allow people to sleep, I was bothered by how bright the side lights still were. It was still quite bright for me in a window seat, when I wish I could have slept!

Generally on time departures and arrivals, clean planes, sky miles membership provides great benefits (complimentary upgrades, etc).

N Everything was perfect from boarding to assistance to baggage in Tampa

Loved the crew! Sucks that we went from 1 hour and 8 minute layover to a 3 hour layover. But weather sucks like that.

Fast, lovely scenery, great info on the Delta flight screen about landmarks we were flying over. Great landing!

Long flight but comfortable and not freezing as I have experienced on Hawaiian flights to the islands. They gave us blankets just in case. Nice touch.

I took seat 15A in anticipation of window seat, there is no window.

Flight late, the waited for a long time for “personal” to arrive at gate to dock the plane in Rochester. So annoying. This flight was expected, why aren’t personel available for the jet bridge?

My recent experience was excellent on Delta! I flew with Delta Comfort and I was really comfortable in my seat. I enjoyed the in-flight service. The flight attendants were so friendly and hospitable. I love the snack on the flight as well. This was my first time flying on Delta and I will definitely consider flying with them again.

Mechanical Delay of over an hour with multiple gate changes. Entertainment system down for rejuvenation.

Horrifying Almost 2 million miles. Bring your own food and drink. One coffee or drink every three hours. Have to order meals on app more than 24 hours ahead Tiny and dirty bathrooms

Flight was delayed but more than 90 minutes. This caused me to miss my available windows for pick-up by a friend. I had to pay $125 for an uber back home from the airport which was an added expense that I had not budgeted for my trip. Staff was friendly.

Seat pitch is horrible especially on the 15 hour flight. Gate crew at SFO was Outstanding. The flight crew was also great.

My service dog and I were asked to deplane just before they closed the door - clearly very last minute they couldn’t find the documentation that I have filled out many many times before that is for flying service animals. I purposely purchase 3seats (a whole row) since he is large and not all passengers want to sit next to a dog on a cross country flight. The plane departed with my husband on it!!! They made me fill out a hard copy of the same form and had to reschedule me on a later flight where they could find 3 seats together!! I’ve done this so many times before - clearly the error was on their part in a technology glitch - but really people - do better!! Very traumatic - and my husband had to wait for us when he landed ….so bad. Poor pup was confused and tired.

Late plane. Only one crew on the ground so we b had to wait for Denver flight to come in, board, and depart. At 78 yrs of age I was not pleased trying to get my connection. What really made me angry was the notification you sent me to hurry up or I would miss my connection. Why tell me to hurry up when you got me in late. It was not a good way of treating customers.

No screens or meal options. Freezing cold. Dirty seats. Left late.

Booked through Kayak Business, had a seat in middle and towards back due to booking rate, not comfortable.

Outstanding service, efficient & friendly crew, flight was safe, comfortable & on time

It was a red-eye, but the flight felt surprisingly quick. The seats were very comfortable, and that made resting much easier. I also want to thank the gentleman seated next to me, who graciously moved so my mom could sit beside me. We slept almost the entire way. The cabin crew was respectful in not disturbing us, while also being courteous and professional throughout. Thank you, United.

Boarding was again a "free for all". We were boarding group 4, and almost the entire plane was able to board before us. It's a shame that someone who follows the rules, gets the short end of the stick. Not fair.

Take-off delayed an hour because of a missing flight officer, so,arrived in Charlotte lates causing many passengers to miss connections. Otherwise a very good flight, safe and comfortable, with an excellent professional crew.

The flight from LA to Chicago was smooth and service was very good overall.

Ontario airport boarding was very easy to park and access, is clean and TSA took 10 minutes total. Check-in was a breeze and cruise was very nice.

not sure why you ask about food, I n3ver get food on flights except maybe cookies or pretzels. wifi was slow and in and out most of the flight not good.

Left early arrived early..right amount of talking from pilots..of course had to love the biscuit and water!

Boarding gate at LAX was too crowded—two gates next to one another

On time departure and early arrival. Flight attendant very nice.

The SFO Lounge crew were amazing. The bartender Faris was great. Thanks!

Was not able to do a online check-in because the American Airlines system doesn't store our visa or other passport information, allowing us to have a trouble-free check-in. We were forced to have to check-in at the counter which Changes are upgrade status given that we were not able to check in much earlier.

Good flight, seated and had a water within 5 minutes. Crew was hospitable.

Everything you need to know for your flight from Ontario to Milwaukee

Information on your arrival and departure airports