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ONT - MKE

$55 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 5/14. 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
Sat 5/25
Sat 6/1

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 45,119,101 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
7:16 am - 10:56 amONT-MKE
25h 40m1 stop
7:52 pm - 11:59 pmMKE-ONT
6h 07m1 stop
$100Frontier
Find Deal
Tue, May 14 - Fri, May 17
12:56 am - 3:35 pmONT-MKE
12h 39m1 stop
12:48 pm - 11:20 amMKE-ONT
24h 32m1 stop
$132Frontier
Find Deal
Thu, May 9 - Mon, May 13
12:40 pm - 12:14 amONT-MKE
9h 34m1 stop
7:30 am - 6:17 pmMKE-ONT
12h 47m1 stop
$334American Airlines
Find Deal
Wed, Aug 21 - Wed, Aug 28
12:50 pm - 11:25 pmONT-MKE
8h 35m1 stop
2:13 pm - 10:29 pmMKE-ONT
10h 16m1 stop
$336American Airlines
Find Deal
Wed, May 22 - Wed, May 29
10:58 pm - 11:48 amONT-MKE
10h 50m1 stop
5:02 am - 4:05 pmMKE-ONT
13h 03m2 stops
Sun, May 12 - Wed, May 15
12:59 am - 8:44 amONT-MKE
5h 45m1 stop
2:33 pm - 11:58 pmMKE-ONT
11h 25m1 stop
Sun, Jun 2 - Tue, Jun 11
10:00 pm - 9:32 amONT-MKE
9h 32m1 stop
6:20 am - 12:13 pmMKE-ONT
7h 53m1 stop
$358Delta
Find Deal
Mon, May 20 - Wed, May 22
6:00 am - 5:42 pmONT-MKE
9h 42m1 stop
1:00 pm - 9:39 pmMKE-ONT
10h 39m2 stops
$363Delta
Find Deal
Tue, May 21 - Sat, May 25
1:36 pm - 11:59 pmONT-MKE
8h 23m1 stop
3:54 pm - 8:53 pmMKE-ONT
6h 59m1 stop
$428United Airlines
Find Deal
Wed, May 15 - Tue, May 21
5:15 am - 9:47 pmONT-MKE
14h 32m1 stop
7:15 am - 8:48 pmMKE-ONT
15h 33m1 stop
$501United Airlines
Find Deal
Sat, May 18 - Mon, May 27

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 Tuesday, 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 February, where tickets cost $325 on average. On the other hand, the most expensive months are April and December, where the average cost of tickets is $493 and $479 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 2 weeks before departure. For the absolute cheapest price, our data suggests you should book 88 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 ($100) and American Airlines ($334). Frontier proposed the cheapest one-way flight at $55.

Good to know

Low season

February

High season

August

Cheapest flight

$55
Best time to beat the crowds but there is an average 29% increase in price.
Most popular time to fly with an average 12% 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 $55 for a one-way ticket and $100 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, SkyTeam, and Star Alliance 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 $591 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 11004 reviews
8.0entertainment
8.2boarding
7.5food
7.9comfort
8.6crew
Airline reviews

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

6.0 GoodEliza, Apr 2024SAN - LAX
Read more about Delta reviews

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

Plane was turned around due to fog half way into the flight, Delta did not properly direct passengers to stay on same flight and instead failed to properly rebook on Alaska

Like most domestic flights in the US, you are basically on your own with this airline when it comes to food, so be sure to purchase meals and drinks ahead of time or expect to arrive starving and dehydrated (like I was).

You need to be a hacker to get the (Free) WiFi

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.

United WiFi is consistently unusable (it can take 10 mins to load a single web page). If you need Wifi to do work, be prepared to lose half a day of productivity.

Awful. I got stuck next to a person carrying a dog and behind someone with a dog. People need to board these dogs downstairs. The cabin is crowded enough with your pets

Packed in like sardines, very uncomfortable. Sitting the aisle my shoulder was rammed into numerous times by rushing flight attendants. Also flight was very cold.

the head jack on my seat didn't work and the power outlet didn't work for my seat

Left 2 hours later for delayed I had to take care a kid with special need since people don’t want to move to accommodate the rest of the family. . It wasn’t bad but that made me upset that people can be that selfish.

For a 22 minute flight all you expect is for it to be safe and comfortable

Flight was on time. Staff were friendly. I paid for Economy Plus but was required to check my standard carry-on luggage due to lack of space on the aircraft. This cost me 30 minutes, unexpectedly, in waiting at the baggage claim. This experience did not meet my expectations.

Wouldn’t let me check in said couldn’t find a ticket had to wait very long Time

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.

No meal on a cross country flight? SFO-MiA is pretty much the definition of a coast to coast flight. No meal provided. Sky high wi-fi rates too. Stop nickel and diming your customers.

The staff was unprofessional and didn’t communicate very well. The boarding process was very disheveled, potentially due to a power outage the previous day but there was no contingency plan to properly get passengers boarded the following day. Once boarded the aircraft stayed on the tarmac for over 45 minutes due to high winds. The communication was sporadic but an announcement was finally made an additional 30 minutes later that the flight was cancelled but we couldn’t get off the plane. Prior to deplaning one of the gate agents came on the plane and made an announcement for everyone to pickup their checked bags and take a card to rebook a new reservation because they didn’t have adequate staff. Flights were missed, passengers went to different airports and there was little to no assistance from AA.

Apart from the delay due to unforeseen circumstances. The leg from sjc to dfw was fine. It was the leg from dfw to orf that we encountered issues mainly due to the flight attendant crew not being friendly. We had two small children and we needed some assistance to warm up milk so the baby would sleep. The crew just didn’t get it and made things very difficult. One made a remark that the baby’s dirty diaper smell was a “gift” to the plane in a rude way. Normally I’d brush that off as a funny comment if the rest of the trip the attendants were helpful or understanding of the difficulty we faced. But that wasn’t the case. We were met with rudeness on the second leg. Whereas on the first leg the crew were so nice and helpful.

Flight From PHX to CVG was on time, very professional staff

Flight was delayed and missed connecting flight. Did not give warning about delay until we showed up at the airport. Not good.

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.

Didn’t make the connecting flight due to a delay on our first flight.

I felt scam to have to pay $50 additional for my carry on luggage which was free for my other airline.

Enjoyed the experience, on time flights, friendly staff the WiFi was intros d kept cutting out.

Awful experience. Both flights were delayed several times with weather but also crew members being the official cause. The vouchers are unusable and insufficient ($50 voucher to fly the same crappy airline is a joke for putting me on a red-eye that landed at 3:00 am). The aircrafts were old and uncomfortable (have a real pocket on the seat, for crying out loud!).

Its so random that they only allow 40 pounds on checked bags when all airlines take 55. They then charge you for each 10 extra pounds, so my checked suitcase was $130 and the flight $30 ... its like whattt, im for sure not traveling with Spirit again

It wasn’t as horrible as I would have expected, however, to not provide water and change so much for bags is a ripoff to say the least.

Desk staff at gate were helpful. Didn't have a plane until after scheduled departure time - no explanation offered while we waited. Seats are uncomfortable - arm rests are metal and uncomfortable in a narrow seat. No food, drinks or entertainment unless purchased. They charge a huge price for carryon luggage. Flight was good.

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

Flight was cancelled and I had to spend the night in the airport lugging my suitcase around

Terrible. Seats are bad and the baggage policy is inconsistent

Better than I expected but I did pay for a seat and carry on bags ahead of time.

I hope to avoid flying with them in the future. First flight got cancelled then got stuck with a 13 hour layover in Denver. The process was long and frustrating to many people.

Flight was delayed on the runway for 40 minutes the crew did not even offer even water to passengers to compensate for the flight delayed. The flight was delayed due to aircraft mechanical issues. Worst customer service ever

The flight was delayed and I had to cancel because I would have missed my connection and there were no other flights for the next two days. They also lost my bag!!

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.
5/14Tue
1 stopFrontier
25h 40mONT-MKE
$55
5/7Tue
1 stopFrontier
7h 57mONT-MKE
$59
5/14Tue
2 stopsAmerican Airlines
8h 32mONT-MKE
$174
5/22Wed
1 stopAlaska Airlines
11h 59mONT-MKE
$207
5/8Wed
1 stopDelta
9h 02mONT-MKE
$233
6/8Sat
1 stopUnited Airlines
16h 44mONT-MKE
$239
5/21Tue
2 stopsUnited Airlines
15h 13mONT-MKE
$244
7/15Mon
1 stopDelta
9h 46mONT-MKE
$253
5/22Wed
2 stopsAlaska Airlines
13h 24mONT-MKE
$264
6/7Fri
2 stopsAmerican Airlines
9h 39mONT-MKE
$363

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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.
4/25Thu
multi-stopFrontier
17h 00mONT-MKE
4/29Mon
multi-stopFrontier
20h 15mMKE-ONT
$228
4/26Fri
multi-stopFrontier
6h 19mONT-MKE
4/29Mon
multi-stopFrontier
11h 09mMKE-ONT
$287
4/26Fri
multi-stopUnited Airlines
5h 39mONT-MKE
5/1Wed
multi-stopUnited Airlines
14h 25mMKE-ONT
$696
4/26Fri
multi-stopUnited Airlines
5h 39mONT-MKE
4/29Mon
multi-stopUnited Airlines
16h 49mMKE-ONT
$701
4/27Sat
multi-stopUnited Airlines
5h 39mONT-MKE
4/30Tue
multi-stopUnited Airlines
12h 20mMKE-ONT
$711
4/27Sat
multi-stopUnited Airlines
6h 00mONT-MKE
4/30Tue
multi-stopUnited Airlines
14h 44mMKE-ONT
$716
4/28Sun
multi-stopDelta
12h 20mONT-MKE
5/4Sat
multi-stopDelta
11h 45mMKE-ONT
$752
4/25Thu
multi-stopUnited Airlines
8h 23mONT-MKE
4/28Sun
multi-stopUnited Airlines
6h 25mMKE-ONT
$766
4/26Fri
multi-stopAlaska Airlines
24h 17mONT-MKE
5/1Wed
multi-stopAlaska Airlines
12h 55mMKE-ONT
$1,155
4/29Mon
multi-stopAlaska Airlines
13h 06mONT-MKE
5/2Thu
multi-stopAlaska Airlines
11h 22mMKE-ONT
$3,065

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Ontario - Milwaukee Flights

Departure:

Ontario (ONT)United States

Destination:

Milwaukee (MKE)United States

Return flight deals:

Milwaukee - Ontario

Cabin classes: