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$117+ Cheap flights from Ontario to Milwaukee (ONT - MKE)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 9/27. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — MKE
ago. 4 — ago. 111
lun. 8/4
lun. 8/11
1 adult, Economy
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Cheapflights Tip: The best prices from Ontario to Milwaukee-Mitchell are usually found in January or November, booked 51 days in advance, depart on a Wednesday or Saturday and return on a Wednesday

Cheap flight deals from Ontario to Milwaukee

Discover tips and strategies to find the most affordable flight options for your journey from Ontario (ONT) to Milwaukee (MKE). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated julio 30, 2025.

Round-trip from

$265
(FlightHub)

One-way from

$117
(FlightHub)

Popular in

July

Cheapest in

January

Average price

$496
From Ontario to Milwaukee-Mitchell
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One-way flight from Ontario to Milwaukee-Mitchell
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Highest demand for flights based on searches. 6% potential increase in price ($28 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($9 potential savings vs. average RT price).
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Average for round-trip flights in July 2025
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Find flight deals from Ontario to Milwaukee

Cheapest flights from Ontario to Milwaukee
Explore the most affordable flight options available from Ontario to Milwaukee. Find the lowest fares from popular airlines and budget airlines, with prices last updated on julio 30, 2025.

This FlightHub deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 8/215:09 pmONT - MKE
1 stop24h 03mFrontier
dom. 8/248:02 pmMKE - ONT
1 stop14h 43mFrontier
Deal found 7/30$265
This Alaska Airlines deal was found by Cheapflights users on 7/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 9/311:39 amONT - MKE
1 stop10h 23mAlaska Airlines
mié. 9/106:27 amMKE - ONT
1 stop9h 45mAlaska Airlines
Deal found 7/29$324
This Delta deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 8/307:05 amONT - MKE
1 stop7h 32mDelta
lun. 9/17:30 amMKE - ONT
1 stop6h 44mDelta
Deal found 7/30$331
This Southwest deal was found by Cheapflights users on 7/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 8/223:30 pmONT - MKE
1 stop5h 30mSouthwest
lun. 8/256:20 pmMKE - ONT
1 stop5h 40mSouthwest
Deal found 7/29$357
This American Airlines deal was found by Cheapflights users on 7/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 8/226:17 amONT - MKE
2 stops11h 43mAmerican Airlines
lun. 8/256:16 amMKE - ONT
1 stop9h 23mAmerican Airlines
Deal found 7/29$377
This Hawaiian Airlines deal was found by Cheapflights users on 7/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Hawaiian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 9/611:39 amONT - MKE
1 stop10h 23mHawaiian Airlines
mar. 9/96:27 amMKE - ONT
1 stop9h 45mHawaiian Airlines
Deal found 7/28$400
This United Airlines deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 8/271:19 pmONT - MKE
1 stop8h 40mUnited Airlines
sáb. 9/65:00 amMKE - ONT
2 stops9h 32mUnited Airlines
Deal found 7/30$420

Cheapflights Fare Finder

 
Customize your flight search to find flights from Ontario to Milwaukee that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated julio 30, 2025.
Use the filters below to find and compare flights from Ontario to Milwaukee that are best for you.

Fly from

Ontario

Fly to

Milwaukee

Route

Depart

Return

Price

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

jue. 8/21

5:09 pm-7:12 pm

1 stop24h 03m

Milwaukee-Mitchell

dom. 8/24

8:02 pm-8:45 am

1 stop14h 43m

$265

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

mié. 9/3

11:39 am-12:02 am

1 stop10h 23m

Milwaukee-Mitchell

mié. 9/10

6:27 am-2:12 pm

1 stop9h 45m

$324

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

sáb. 8/30

7:05 am-4:37 pm

1 stop7h 32m

Milwaukee-Mitchell

lun. 9/1

7:30 am-12:14 pm

1 stop6h 44m

$331

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

vie. 8/22

3:30 pm-11:00 pm

1 stop5h 30m

Milwaukee-Mitchell

lun. 8/25

6:20 pm-10:00 pm

1 stop5h 40m

$357

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

vie. 8/22

6:17 am-8:00 pm

2 stops11h 43m

Milwaukee-Mitchell

lun. 8/25

6:16 am-1:39 pm

1 stop9h 23m

$377

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

sáb. 9/6

11:39 am-12:02 am

1 stop10h 23m

Milwaukee-Mitchell

mar. 9/9

6:27 am-2:12 pm

1 stop9h 45m

$400

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

mié. 8/27

1:19 pm-11:59 pm

1 stop8h 40m

Milwaukee-Mitchell

sáb. 9/6

5:00 am-12:32 pm

2 stops9h 32m

$420

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

sáb. 9/27

8:59 pm-2:14 pm

1 stop15h 15m

$117

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

mar. 9/30

11:39 am-12:02 am

1 stop10h 23m

$162

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

mar. 8/26

1:15 pm-9:35 pm

1 stop6h 20m

$163

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/29

Showing 1-10 of 14 results
1
2

Best time to book a flight from Ontario to Milwaukee

Have a flexible travel schedule? Discover the best time to fly to Milwaukee from Ontario with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

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

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

Use this chart to determine the optimal time to book a round-trip flight from Ontario to Milwaukee. Price data was last updated on July 25, 2025.

The best time to book flights from Ontario to Milwaukee is 50 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

What is the cheapest month to book a flight from Ontario to Milwaukee?

Currently, February is the cheapest month in which you can book a flight from Ontario to Milwaukee (average of $280). Flying from Ontario to Milwaukee in June is currently the most expensive (average of $376). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from ONT to MKE?

Find hourly flight availability from Ontario to Milwaukee. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated julio 30, 2025.

One of the essential ways to save on airfare from Ontario to Milwaukee is to remain as flexible as possible. Flights that are at noon tend to be the most expensive. A flight in the evening could potentially save you up to 33% on airfare.

Reviews of airlines servicing Milwaukee

Get insights into the airlines that provide service to Milwaukee. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Milwaukee. Reviews last updated julio 30, 2025.
Read reviews from past customers who have flown Alaska Airlines, Southwest, and Delta from Ontario to Milwaukee. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Comfort

7.8

Entertainment

7.1

Boarding

8.1

Crew

8.5

Overall

8.0

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Comfort

7.8

Entertainment

7.1

Boarding

8.1

Crew

8.5

Overall

8.0

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Southwest
8.0
Very good
4,241 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Comfort

7.8

Entertainment

7.1

Boarding

8.1

Crew

8.5

Overall

8.0

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Delta
8.0
Very good
7,980 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Comfort

7.8

Entertainment

7.1

Boarding

8.1

Crew

8.5

Overall

8.0

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Hawaiian Airlines
7.8
Good
2,611 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Comfort

7.8

Entertainment

7.1

Boarding

8.1

Crew

8.5

Overall

8.0

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
United Airlines
7.4
Good
8,896 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Comfort

7.8

Entertainment

7.1

Boarding

8.1

Crew

8.5

Overall

8.0

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

Related info for your journey

Find useful and relevant information for your journey from Ontario to Milwaukee. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What are the cheapest airlines flying from Ontario to Milwaukee round-trip?

    Frontier, at $265, was found to be the cheapest airline from Ontario to Milwaukee.Alternate airlines to your destination round-trip include Alaska Airlines and Delta. Frontier is currently priced 35% below the average price you’ll pay for this route.

  • What are the cheapest airlines to fly from Ontario to Milwaukee one-way?

    For one-way options, check prices for Frontier. According to our data, you can fly for as low as $117. Users have also found prices from $162 and $163 on Alaska Airlines and Delta, respectively.

  • Can I find deals for flights from Ontario to Milwaukee that include hotel bookings?

    Yes. In addition to deals on Ontario to Milwaukee flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Ontario to Milwaukee?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Ontario to Milwaukee.

  • Can I find deals for business class flights from Ontario to Milwaukee?

    Yes. Cheapflights offers flight deals from Ontario to Milwaukee by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Ontario to Milwaukee?

    Currently, February is the cheapest month in which you can book a flight from Ontario to Milwaukee (average of $280). Flying from Ontario to Milwaukee in June is currently the most expensive (average of $376). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Traveling to a place near Milwaukee?

Book flights to Milwaukee if you plan to visit one of these locations
Mequon
Oak Creek
Sheboygan
Wauwatosa

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Alternative routes for Ontario to Milwaukee

See prices for flight routes from nearby airports that may be better suited for you.
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Top 4 airlines flying from Ontario to Milwaukee

Discover the top 4 airlines that operate flights from Ontario to Milwaukee. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated julio 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$253Average$367FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$298Average$409FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$326Average$414FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$391Average$514FlexibilityNo cancel feeOn-time69%

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