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Cheap flights from Ontario to Milwaukee from $139

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Ontario to Milwaukee departing on 8/25. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
1 adult, Economy, 0 bags

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Find the cheapest flights from Ontario to Milwaukee

Cheap round-trip flights

Enter your travel dates to find the best prices.
American Airlines Logo
6:15 am - 1:56 pm
ONT
-
MKE
5h 41m
1 stop
American Airlines Logo
5:50 pm - 10:58 pm
MKE
-
ONT
7h 08m
1 stop
$298American Airlines
Tue, Aug 18 - Tue, Aug 25
American Airlines Logo
6:15 am - 1:56 pm
ONT
-
MKE
5h 41m
1 stop
American Airlines Logo
11:29 am - 6:15 pm
MKE
-
ONT
8h 46m
2 stops
$303American Airlines
Tue, Aug 18 - Tue, Aug 25
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, Sep 10 - Wed, Sep 16
Delta Logo
1:00 pm - 9:24 pm
ONT
-
MKE
6h 24m
1 stop
Delta Logo
5:30 am - 10:47 am
MKE
-
ONT
7h 17m
1 stop
$377Delta
Sun, Sep 13 - Wed, Sep 16
American Airlines Logo
6:15 am - 5:00 pm
ONT
-
MKE
8h 45m
2 stops
American Airlines Logo
11:29 am - 6:15 pm
MKE
-
ONT
8h 46m
2 stops
$381American Airlines
Tue, Aug 18 - Tue, Aug 25
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, Aug 13 - Fri, Aug 21
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
Thu, Sep 10 - Wed, Sep 16
Alaska Airlines Logo
6:00 am - 4:04 pm
ONT
-
MKE
8h 04m
1 stop
Alaska Airlines Logo
5:00 pm - 11:42 pm
MKE
-
ONT
8h 42m
1 stop
$395Alaska Airlines
Tue, Oct 27 - Wed, Oct 28
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 14 - Tue, Jul 21

Alaska Airlines flights from Ontario to Milwaukee

Our best Alaska Airlines deals on Ontario to Milwaukee flight tickets
Alaska Airlines
Oct 27
ONT6:00 amOntario
8h 04m
1 stop
MKE4:04 pmMilwaukee-Mitchell
Oct 28
MKE5:00 pmMilwaukee-Mitchell
8h 42m
1 stop
ONT11:42 pmOntario
$395
Alaska Airlines
Sep 1
ONT12:00 pmOntario
9h 59m
1 stop
MKE11:59 pmMilwaukee-Mitchell
Sep 2
MKE7:02 amMilwaukee-Mitchell
9h 07m
1 stop
ONT2:09 pmOntario
$427
Alaska Airlines
Aug 4
ONT7:00 amOntario
22h 44m
2 stops
MKE7:44 amMilwaukee-Mitchell
Sep 8
MKE3:05 pmMilwaukee-Mitchell
22h 11m
1 stop
ONT11:16 amOntario
$468

Delta flights from Ontario to Milwaukee

Our best Delta deals on Ontario to Milwaukee flight tickets
Delta
Sep 10
ONT12:00 pmOntario
9h 25m
1 stop
MKE11:25 pmMilwaukee-Mitchell
Sep 16
MKE5:30 amMilwaukee-Mitchell
7h 17m
1 stop
ONT10:47 amOntario
$304
Delta
Sep 13
ONT1:00 pmOntario
6h 24m
1 stop
MKE9:24 pmMilwaukee-Mitchell
Sep 16
MKE5:30 amMilwaukee-Mitchell
7h 17m
1 stop
ONT10:47 amOntario
$377
Delta
Aug 13
ONT12:00 pmOntario
9h 53m
1 stop
MKE11:53 pmMilwaukee-Mitchell
Aug 21
MKE5:34 amMilwaukee-Mitchell
7h 08m
1 stop
ONT10:42 amOntario
$382

momondo 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, momondo users made 832,500 searches. Data last updated June 4, 2026.
Use the filters below to find and compare flights from Ontario to Milwaukee that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip
Quickest round-trip

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Tue 8/18

6:15 am-1:56 pm

1 stop5h 41m

Milwaukee-Mitchell

Tue 8/25

5:50 pm-10:58 pm

1 stop7h 08m

$298

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Tue 8/18

6:15 am-1:56 pm

1 stop5h 41m

Milwaukee-Mitchell

Tue 8/25

11:29 am-6:15 pm

2 stops8h 46m

$303

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Thu 9/10

12:00 pm-11:25 pm

1 stop9h 25m

Milwaukee-Mitchell

Wed 9/16

5:30 am-10:47 am

1 stop7h 17m

$304

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Thu 9/10

7:11 pm-8:01 am

2 stops10h 50m

Milwaukee-Mitchell

Wed 9/16

7:00 am-1:25 pm

1 stop8h 25m

$342

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Sun 9/13

1:00 pm-9:24 pm

1 stop6h 24m

Milwaukee-Mitchell

Wed 9/16

5:30 am-10:47 am

1 stop7h 17m

$377

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Tue 8/18

6:15 am-5:00 pm

2 stops8h 45m

Milwaukee-Mitchell

Tue 8/25

11:29 am-6:15 pm

2 stops8h 46m

$381

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Thu 8/13

12:00 pm-11:53 pm

1 stop9h 53m

Milwaukee-Mitchell

Fri 8/21

5:34 am-10:42 am

1 stop7h 08m

$382

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Thu 9/10

5:15 am-2:25 pm

2 stops7h 10m

Milwaukee-Mitchell

Wed 9/16

7:10 am-12:40 pm

2 stops7h 30m

$388

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Tue 10/27

6:00 am-4:04 pm

1 stop8h 04m

Milwaukee-Mitchell

Wed 10/28

5:00 pm-11:42 pm

1 stop8h 42m

$395

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Tue 7/14

1:20 pm-10:30 pm

2 stops7h 10m

Milwaukee-Mitchell

Tue 7/21

6:20 pm-10:20 pm

1 stop6h 00m

$400

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Milwaukee from

How to get the cheapest flight ticket from Ontario to Milwaukee

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the typical price of a round-trip flight between Ontario and Milwaukee?

What is the cheapest month to fly to Milwaukee?

The cheapest month to fly to Milwaukee from Ontario is in September. Flight prices, which tend to average around $366, are often lower during this time because this is during the off-season. The month of December is another great option to travel to Milwaukee, with average flight prices from Ontario averaging around $406.

What is the cheapest day to depart on your flight to Milwaukee?

According to our data, Sunday is the cheapest day to fly to Milwaukee from Ontario. The lowest ticket price found for a Sunday departure recently was $169. Keep in mind that prices can always vary depending on your route and whether or not you are flying domestic or international. Flights from Ontario to Milwaukee on a Thursday will generally be more expensive and average around $181. Keep in mind that these prices on both days could fluctuate depending on the season and the demand.

How have Ontario to Milwaukee flight prices changed over time?

As of June 2026, prices for Ontario to Milwaukee flights are approximately 230% more expensive when compared to flights at the same time last year.

When to book flights from Ontario to Milwaukee

Are you open to changing your travel dates? Check out the ideal times to fly from Ontario to Milwaukee according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Ontario to Milwaukee (ONT to MKE) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Ontario to Milwaukee

Fastest flight time

5h 57m

Direct flights

None
The fastest flight from Ontario to Milwaukee takes 5h 57m
There are no direct flights from Ontario to Milwaukee. There are no popular flight routes from Ontario to Milwaukee.
Search flight deals

Frequently asked questions about flying from Ontario to Milwaukee

  • How far is Ontario to Milwaukee-Mitchell by plane?

    The straight-line distance from Ontario to Milwaukee-Mitchell is 1710.4 mi. Flights usually cover this in 5h 57m, depending on flying conditions and air traffic around both airports.

  • When did momondo last update prices for flights from Ontario Airport to Milwaukee-Mitchell Airport?

    Prices for flights from Ontario Airport to Milwaukee-Mitchell Airport are updated daily.

  • How many operators does momondo search for flights from Ontario Airport to Milwaukee-Mitchell Airport?

  • How old do you have to be to fly from Ontario Airport to Milwaukee-Mitchell Airport?

    Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Ontario Airport to Milwaukee-Mitchell Airport.

  • What documentation or ID do you need to fly to Milwaukee-Mitchell Airport?

    The travel and health documents required for your trip to Milwaukee-Mitchell Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Milwaukee-Mitchell Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

  • What is the most popular airline from Ontario to Milwaukee?

Best airlines flying from Ontario to Milwaukee

Compare and see reviews for airlines that fly from Ontario to Milwaukee with momondo
Airline
Rating
Free Cancellation
Price
American AirlinesPriceFrom $276Free CancellationRating
7.1
11,641 reviews
Search American Airlines flights
United AirlinesPriceFrom $309Free CancellationRating
7.4
9,773 reviews
Search United Airlines flights
SouthwestPriceFrom $350Free CancellationRating
8.0
4,256 reviews
Search Southwest flights
DeltaPriceFrom $356Free CancellationRating
7.8
8,395 reviews
Search Delta flights

Traveling to a place near Milwaukee?

Book flights to Milwaukee if you plan to visit one of these locations
Sheboygan
Waukesha
Wauwatosa
Oak Creek
Mequon
Glendale
Pewaukee
Port Washington
West Bend
Kohler
New Berlin
Grafton

Why use momondo?

Why should I use momondo to find a flight deal from Ontario to Milwaukee?

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from Ontario to Milwaukee. momondo saves you time and could save you money on your trip.

Can I find flights from Ontario to Milwaukee with flexible booking policies on momondo?

Yes. momondo allows you to filter the results for Ontario to Milwaukee flights to just show those with flexible booking policies.

How can momondo help me find flights from Ontario to Milwaukee?

momondo provides multiple filters to help you find the best flight to Milwaukee from Ontario. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.

I’m not ready to book a flight from Ontario to Milwaukee right now. Can momondo alert me if prices change?

Price alerts on flights to Milwaukee from Ontario are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.

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