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ONT - MKE

$98 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 6/25. 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
0 bags
Wed 7/10
Wed 7/17

Search 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
In the last 7 days travelers have searched 42,898,604 times on KAYAK, and here is why:

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Cheap flight deals 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 and deals for you by selecting your travel dates.
Choose your dates
12:59 am - 8:46 amONT-MKE
5h 47m1 stop
9:36 am - 7:37 pmMKE-ONT
12h 01m1 stop
$155Frontier
Find Deal
Tue, Jul 30 - Wed, Aug 28
12:59 am - 8:46 amONT-MKE
5h 47m1 stop
9:24 pm - 11:39 pmMKE-ONT
28h 15m1 stop
$157Frontier
Find Deal
Tue, Aug 6 - Mon, Aug 12
12:39 am - 10:23 amONT-MKE
7h 44m1 stop
7:45 am - 3:29 pmMKE-ONT
9h 44m1 stop
Fri, Aug 2 - Wed, Aug 7
6:05 am - 4:44 pmONT-MKE
8h 39m1 stop
2:42 pm - 9:40 pmMKE-ONT
8h 58m1 stop
$371American Airlines
Find Deal
Sat, Aug 3 - Wed, Aug 7
10:00 pm - 9:12 amONT-MKE
9h 12m1 stop
4:59 pm - 10:57 pmMKE-ONT
7h 58m1 stop
$376Delta
Find Deal
Sun, Aug 4 - Wed, Aug 7
10:00 pm - 9:12 amONT-MKE
9h 12m1 stop
5:49 pm - 11:59 pmMKE-ONT
8h 10m2 stops
$381Delta
Find Deal
Sun, Aug 4 - Wed, Aug 14
12:59 am - 8:46 amONT-MKE
5h 47m1 stop
7:45 am - 10:40 pmMKE-ONT
16h 55m2 stops
Tue, Aug 6 - Mon, Aug 12
4:31 pm - 11:00 amONT-MKE
16h 29m2 stops
5:30 pm - 10:05 pmMKE-ONT
6h 35m1 stop
$397American Airlines
Find Deal
Thu, Jul 4 - Sat, Jul 13
5:10 am - 11:59 pmONT-MKE
16h 49m1 stop
2:40 pm - 8:48 pmMKE-ONT
8h 08m1 stop
$465United Airlines
Find Deal
Sat, Aug 3 - Tue, Aug 6
1:30 pm - 9:28 pmONT-MKE
5h 58m1 stop
3:25 pm - 9:11 pmMKE-ONT
7h 46m1 stop
$466United Airlines
Find Deal
Thu, Aug 8 - Mon, Aug 12

Flights from Ontario to Milwaukee - Travel Insights & Trends

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.

What’s the cheapest day of the week to fly from Ontario to Milwaukee?

The average price of all flights from Ontario to Milwaukee clicked on KAYAK for each day over the last 12 months.
For Ontario to Milwaukee, Saturday is the cheapest day to fly on average and Sunday is the most expensive. Flying from Milwaukee back to Ontario, the best deals are generally found on Monday, with Saturday being the most expensive.

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 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 October, where tickets cost $346 on average. On the other hand, the most expensive months are March and May, where the average cost of tickets is $500 and $475 respectively.

How far in advance should I book a flight from Ontario to Milwaukee?

To calculate daily average prices, KAYAK takes all prices for each day before departure over the last year for flights from Ontario to Milwaukee, removes the top 0.1% to account for outliers, and then takes the average of all the values for each month.
To get a below average price on the flight from Ontario to Milwaukee, you should book around 1 week before departure. For the absolute cheapest price, our data suggests you should book 42 days before departure.

Which airlines provide the cheapest flights from Ontario to Milwaukee?

The cheapest price for the route for each airline clicked by KAYAK users in the last 72 hours.
In the last 72 hours, the best return deals on flights connecting Ontario to Milwaukee were found on Frontier ($155) and American Airlines ($371). Frontier proposed the cheapest one-way flight at $98.

Good to know

Low season

February

High season

August

Cheapest flight

$98
Best time to beat the crowds but there is an average 27% increase in price.
Most popular time to fly with an average 15% 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 3 days, the lowest price for a flight from Ontario to Milwaukee was $98 for a one-way ticket and $155 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?

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

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

    The two airlines most popular with KAYAK users for flights from Ontario to Milwaukee are Delta and United Airlines. With an average price for the route of $569 and an overall rating of 8.0, Delta is the most popular choice. United Airlines is also a great choice for the route, with an average price of $526 and an overall rating of 7.4.

  • 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.

See more FAQs

Top 5 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
DeltaOverall score based on 10295 reviews
8.6Crew
7.4Food
8.2Boarding
7.9Comfort
8.0Entertainment
Airline reviews

There was plenty of overhead room but half of the passengers were told they had to check their carryon bags. My partner and I checked in as early as possible and our seats were split across the aisle.

4.0 OkayBrooke, Jun 2024SFO - MSP
Read more about Delta reviews

There was plenty of overhead room but half of the passengers were told they had to check their carryon bags. My partner and I checked in as early as possible and our seats were split across the aisle.

Flew first class so everything was great. But maybe because the flights were red eye, no meals were served, just chips. I flew Alaska Air 1st class at 9PM (2 hour flight) and they served beef short rib sliders!

Checking in at the airport the agent only booked the first keg of my trip and had my checked luggage going to the airport with a layover! Never was issued a boarding pass for the second leg or received sticker fir my checked bag. All was well in the end! Delta agents helped to resolve the situation!!!

There was a loud squeaky sound the whole time we were flying.

I didn’t not like that I could not select my seat and ended up with the worse seat.

The landing was bad and the hostess came two times and i was sleeping but when she served the person that nexts to me I woke up and she didn’t even asked me if I need any drink or snacks two times!!!!

Plane was late because of a mechanical malfunction and the food listed as available was not. Flight attendants seem over worked and under paid. They just done seem happy. And that can be seen in their faces.

Had assistance at airport getting from arrivals gate to departure gate; I couldn't have managed without that extra help. Thank you Delta.

Waited 3 hours on a plane to de-ice due to manpower issues. Waited another hour and a half once we landed because of a gate issue. Missed my connections. Created. A total of 13 hours of delay.

Great, on time departure, friendly and accommodating crew, great leg room, Smith flight

No real agent onsite helping you for missing luggage there. Not like the other airline next to UA desk, they have staff attending in their desk assisting answer/helping luggage issue, even after midnight.

Horrible, the flights kept delaying, so it is obvious that we won't be able to make it to the next connection. No easier/real agent on site to help you figure this out. UA agent on other counters refuse to assist you and direct us to use the QR code/call customer service. So inefficient and poor. While technology seems convenient, but it's not the best interest/experience for customers need help while there is active issue need assistance.

Flight was delayed due to the late arrival of the catering truck, which is quite unacceptable. There was a beverage service, but no pretzel, or cookie, or nuts were served in coach.

I had a great flight. Everything went smoothly and the flight arrived early.

On time take off…US cabins look tired and need of refresh!

I paid $380 for my one-way ticket from California to Minnesota. The fair did not include online check-in. I received instructions from their app to check in at a kiosk. At the kiosk, the boarding pass would not print until an actual person came to verify that I had a personal item and not a carry-on item, On the plane, the person next to me was drunk and allowed to continue to order alcohol. United is garbage I’d rather fly spirit.

Do not like the feeling of being in the basic economy. Everyone should feel good no matter what.

Terrible! The plane was old and you are required to connect your own device to their Wi-Fi rather than have entertainment options in the back of the seat in front of you. The Wi-Fi went out during the flight and there was only one plug for the devices every two seats. Three out of five surrounding my family did not work. The seats and spaces under them were so small I could not fit my backpack, which I’ve always brought on flights and fit before no problem. The crew were unpleasant and patronizing.

Due to one crew member not showing up to work, our flight was significantly delayed causing us to miss our connecting flight in Houston to Mississippi causing us to be delayed by more than 6 hours and missing our event all together. Very disappointing. All because ONE crew member called in sick. United did grant us a $15 meal voucher, which was a small but appreciated concession that I wasn’t able to use because I ordered my lunch and paid for it before applying the concession, and the staff said it was too late to use it. Ugh! We also had a TWO delay coming back from Mississippi, but that was on American Airlines and it was due to weather, so not their fault. Anyway, not at all impressed with United’s handling of our flight and the HUGE disappointment of missing our important family event for our 90 year old mother. All that money and all that stress and emotions for nothing. Having to wait the hour to bring an employee from LAX seemed like something that should not have happened. Why don’t you have a local back-up? Santa Ana is not a little airport in a rural area.

Crew was great and did their best to make us comfortable and captain came out at the beginning to announce why the flight was delayed, weather situation up ahead, and kept us updated throughout the flight.

The flight was delayed several times without explanation. The seats were terribly uncomfortable and wifi isn’t included. All these make for a less than ideal flight.

Internet service was erratic. Crew service was poor and slow. My luggage on this non-stop flight was lost and not recovered

Flight was 1/2 hour delayed leaving Phoenix. Otherwise it was an average flight. Flight crew on this trip was very nice.

Horrible - they lied to me about baggage & boarding, even though I specifically spoke to their agents the day before my flight about my issue. When I showed up they did not let me board and stranded me at my airport until I bought a new flight with money I did not have to spend.

American cancelled our flight home. Zero option for hotel, alternative transportation and took 3 hours to find our bags so we could take a 3 hour UBER ride home on our dime. Never flying AA again.

The experience was great and much better than the flight going out. of course I was in first class but the service was excellent

Comfort of seats, ease of boarding. Food selection could be better

Food options were limited which is absolutely embarrassing for a Flight of this size The staff did not come around as much and I am not accustomed to such poor service from American Airlines Drinks I believe were limited to soda and water

Crew were attentive and friendly. Flight was smooth and early! I enjoyed the less crowded plane. Thank you!

We are gluten free, there were not any available complimentary gluten free options.

Flight was canceled less than 6 hours before takeoff, rebooked on a flight that was twice as long and left earlier so we couldn’t make it, when using text support option took over 2 hours to speak with someone.

Terrible legroom, seats do not recline, tray table the size of an iPhone, delayed flight, have to pay 5$ to get a cup of water onboard.

The crew was the best and very accommodating I know you don't offer any complimentary items but water and coffee will not break the bank !!

My mother was HARASSED AND ACCOSTED by the gate agent for her bag. I pre purchased the bag fee and the gate agent made my 78 year old mother board, deplane, re pay for her bag fee and board again. The gate agent made my mother pick up her own bag and REFUSED to help her, she is an older woman who wasn’t bothering anyone on a flight that had maybe 30’total passengers. I am going to sue this airlines for their HORRIBLE customer service and treatment of my mother, and all this occurred the day after Mother’s Day!!!

Horrible, first flight delayed. They switched my connecting flight while I was en route and even though I was originally supposed to be on the flight going back home to boston, refused to let me board and told me I would have to wait for next flight that was 14 hours later. Ended up renting a car and driving 6.5 hours back home. Still getting messages about flight and it is now showing that the other flight they put me on is now canceled and I would have to wait 24 hours for the next one. I will never book with spirit again

They stuck us with multiple extra fees. I will never fly spirit again

Overall it was a miserable experience... I will never fly spirit for more than a 3 hour flight or overnight.

Kayak does not know that spirit airlines charged me $70 to fly. But the bag check-in was $89 each way. This is false advertising to lure people. Spirit airlines sends bunch of emails after flight purchases to buy wifi, better seats, priority boarding, secure reserved seats. This is false advertising. Up front pricing. I would of flown jet blue or Alaska airlines.

One hour late taking off. Concerning, very hard landing. Uncomfortable seats with no recline. Extremely slow baggage claim. Very professional, knowledgeable flight attendants. Brand new, very clean plane.

Can’t say there was anything I particularly liked. Seats were very tight, leather wrapped plastic. I followed up a much longer and cheaper trip from Honolulu on southwest, everything was phenomenal, this flight was the exact opposite. Blows my mind they charge for water of all things. One of the attendants seemed very rude, I watched a taller gentleman a couple rows forward with his knees pressed into the back of the seat ahead, while the woman in that seat leaned forward the entire flight, I’m sure because she could feel his knees. I’ll be avoiding spirit like the plague from here forward.

I strongly dislike Frontier. I find them barebones, the seats not particularly comfortable, the nickel and diming is maddening, the app is TERRIBLE - super confusing to navigate, and the last 4 frontier flights I have flown have been on AVERAGE 2 hours late, one ruining a fancy night out in Vegas with reservations made well in advance, which was nodded to with a measly 5000 miles, which translates to almost nothing. At least credit a free checked bag or something.

8 hr delay. had to buy another ticket with another airline

I appreciated the upgrade to free cary-on bag and seat selection at no charge

Flight was delay 9hrs and nothing was provided at airport, had to go and get a room to sleep in, paid for Uber back and fort with no offers until we landed back home a 1hr later for a $75 voucher for a future flight.

Didn't like anything..entire crew was very rude to everyone on the flight. Plane old and the trays fall down on you the while time you're flying. Charged more for a carry on bag than for the plane ticket itself. Did make it from point a to point b, but worth the extra money to fly with another airline

Our flight was delayed an hour, then when we got to board our flight finally, we were waiting in our seats for take off for 45 minutes before it was communicated that there was a maintenance issue therefore we waited on the plane for over an hour while that was resolved. We did not get to Phoenix until almost 3 hours after we were originally supposed to. This was the first and last time I will be flying Frontier.

There were 3 leg for the trip and each leg was delayed by 90 minutes or more. The boarding process takes forever with people waiting on the jetway even though most folks do not have carry-on. The whole process is poorly managed.

They cancelled the flight then did nothing to help us rebook. It was awful - I won’t fly with them again

The process of buying the ticket and navigating all the hidden charges that Frontier throws at you was a terrible experience. The actual airport experience and flying was fine.

The truck that was refueling the plane drove away with the hose still connected to the plane and ripped part of the plane off with it

Book cheap flights from Ontario to Milwaukee

Recent one-way flight deals

 
Only flying one-way? Below are some of the best one-way flight deals from Ontario to Milwaukee found on KAYAK in the last 72 hours.
6/25Tue
1 stopFrontier
5h 44mONT-MKE
$98
10/3Thu
1 stopFrontier
27h 35mONT-MKE
$101
7/18Thu
1 stopAlaska Airlines
15h 59mONT-MKE
$242
7/18Thu
2 stopsAlaska Airlines
14h 59mONT-MKE
$247
7/7Sun
1 stopAmerican Airlines
9h 31mONT-MKE
$268
6/25Tue
1 stopAmerican Airlines
6h 54mONT-MKE
$279
7/7Sun
1 stopUnited Airlines
27h 34mONT-MKE
$287
7/8Mon
2 stopsUnited Airlines
17h 20mONT-MKE
$292
6/25Tue
2 stopsDelta
12h 59mONT-MKE
$368
6/15Sat
1 stopDelta
6h 05mONT-MKE
$408

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Last minute flights from Ontario to Milwaukee

Last minute flight, train and bus deals

 
These last-minute flight deals are the cheapest flights found on KAYAK in the last 72 hours for flights from Ontario to Milwaukee that are departing in the next 10 days.
6/14Fri
multi-stopFrontier
8h 15mONT-MKE
6/19Wed
multi-stopFrontier
27h 25mMKE-ONT
$240
6/14Fri
multi-stop
8h 15mONT-MKE
6/18Tue
multi-stop
13h 40mMKE-ONT
$546
6/13Thu
multi-stopFrontier
18h 35mONT-MKE
6/17Mon
multi-stopFrontier
14h 36mMKE-ONT
$576
6/13Thu
multi-stopFrontier
18h 35mONT-MKE
6/15Sat
multi-stopFrontier
27h 10mMKE-ONT
$598
6/13Thu
multi-stopUnited Airlines
5h 59mONT-MKE
6/19Wed
multi-stopUnited Airlines
20h 53mMKE-ONT
$795
6/15Sat
multi-stopUnited Airlines
8h 30mONT-MKE
6/17Mon
multi-stopUnited Airlines
15h 31mMKE-ONT
$810
6/13Thu
multi-stopDelta
8h 14mONT-MKE
6/18Tue
multi-stopDelta
10h 01mMKE-ONT
$886
6/14Fri
multi-stopDelta
8h 25mONT-MKE
6/19Wed
multi-stopDelta
14h 13mMKE-ONT
$891
6/13Thu
multi-stopAlaska Airlines
14h 59mONT-MKE
6/19Wed
multi-stopAlaska Airlines
9h 44mMKE-ONT
$999
6/13Thu
multi-stopAlaska Airlines
14h 59mONT-MKE
6/17Mon
multi-stopAlaska Airlines
9h 44mMKE-ONT
$1,069

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Ontario - Milwaukee Flights

Departure:

Ontario (ONT)United States

Destination:

Milwaukee (MKE)United States

Return flight deals:

Milwaukee - Ontario

Cabin classes: