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Cheap flights from Ontario to Milwaukee from $162

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 9/2. 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

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from Ontario to Milwaukee

Cheap round-trip flights

Enter your travel dates to find the best prices.
Delta Logo
1:06 pm - 9:41 pm
ONT
-
MKE
6h 35m
1 stop
Delta Logo
7:30 am - 12:16 pm
MKE
-
ONT
6h 46m
1 stop
$323Delta
Tue, Aug 25 - Tue, Sep 1
Delta Logo
12:00 pm - 11:53 pm
ONT
-
MKE
9h 53m
1 stop
Delta Logo
4:17 pm - 9:52 pm
MKE
-
ONT
7h 35m
1 stop
$325Delta
Wed, Aug 12 - Thu, Aug 20
Delta Logo
1:04 pm - 9:11 pm
ONT
-
MKE
6h 07m
1 stop
Delta Logo
4:46 pm - 10:26 pm
MKE
-
ONT
7h 40m
1 stop
$327Delta
Wed, Sep 9 - Thu, Sep 17
American Airlines Logo
1:11 pm - 11:34 pm
ONT
-
MKE
8h 23m
2 stops
American Airlines Logo
6:40 pm - 11:59 pm
MKE
-
ONT
7h 19m
1 stop
$328American Airlines
Sat, Aug 1 - Tue, Aug 4
Southwest Logo
1:10 pm - 9:25 pm
ONT
-
MKE
6h 15m
1 stop
Southwest Logo
11:45 am - 7:25 pm
MKE
-
ONT
9h 40m
2 stops
$330Southwest
Tue, Aug 11 - Mon, Aug 24
American Airlines Logo
7:05 am - 5:00 pm
ONT
-
MKE
7h 55m
1 stop
American Airlines Logo
5:00 am - 12:03 pm
MKE
-
ONT
9h 03m
2 stops
$332American Airlines
Sat, Aug 22 - Tue, Aug 25
United Airlines Logo
5:00 am - 3:47 pm
ONT
-
MKE
8h 47m
2 stops
United Airlines Logo
11:48 am - 8:01 pm
MKE
-
ONT
10h 13m
2 stops
$337United Airlines
Sat, Aug 22 - Tue, Aug 25
Delta Logo
7:05 am - 7:15 pm
ONT
-
MKE
10h 10m
1 stop
Delta Logo
5:34 am - 10:42 am
MKE
-
ONT
7h 08m
1 stop
$363Delta
Sat, Aug 1 - Sun, Aug 16
Delta Logo
12:00 pm - 11:53 pm
ONT
-
MKE
9h 53m
1 stop
Delta Logo
4:46 pm - 10:26 pm
MKE
-
ONT
7h 40m
1 stop
$365Delta
Sun, Sep 6 - Thu, Sep 17
Southwest Logo
4:10 pm - 12:55 am
ONT
-
MKE
6h 45m
1 stop
Southwest Logo
6:35 pm - 12:10 am
MKE
-
ONT
7h 35m
2 stops
$368Southwest
Tue, Jul 28 - Fri, Jul 31

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Southwest flights from Ontario to Milwaukee

Our best Southwest deals on Ontario to Milwaukee flight tickets
Southwest
Aug 11
ONT1:10 pmOntario
6h 15m
1 stop
MKE9:25 pmMilwaukee-Mitchell
Aug 24
MKE11:45 amMilwaukee-Mitchell
9h 40m
2 stops
ONT7:25 pmOntario
$330
Southwest
Jul 28
ONT4:10 pmOntario
6h 45m
1 stop
MKE12:55 amMilwaukee-Mitchell
Jul 31
MKE6:35 pmMilwaukee-Mitchell
7h 35m
2 stops
ONT12:10 amOntario
$368
Southwest
Aug 21
ONT8:30 amOntario
7h 15m
2 stops
MKE5:45 pmMilwaukee-Mitchell
Aug 24
MKE4:35 pmMilwaukee-Mitchell
7h 10m
1 stop
ONT9:45 pmOntario
$370

United Airlines flights from Ontario to Milwaukee

Our best United Airlines deals on Ontario to Milwaukee flight tickets
United Airlines
Aug 22
ONT5:00 amOntario
8h 47m
2 stops
MKE3:47 pmMilwaukee-Mitchell
Aug 25
MKE11:48 amMilwaukee-Mitchell
10h 13m
2 stops
ONT8:01 pmOntario
$337
United Airlines
Aug 22
ONT1:18 pmOntario
5h 45m
1 stop
MKE9:03 pmMilwaukee-Mitchell
Aug 31
MKE2:35 pmMilwaukee-Mitchell
8h 18m
1 stop
ONT8:53 pmOntario
$425
United Airlines
Aug 25
ONT7:00 amOntario
7h 10m
1 stop
MKE4:10 pmMilwaukee-Mitchell
Sep 1
MKE3:15 pmMilwaukee-Mitchell
9h 20m
1 stop
ONT10:35 pmOntario
$427

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 July 6, 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 8/25

1:06 pm-9:41 pm

1 stop6h 35m

Milwaukee-Mitchell

Tue 9/1

7:30 am-12:16 pm

1 stop6h 46m

$323

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Wed 8/12

12:00 pm-11:53 pm

1 stop9h 53m

Milwaukee-Mitchell

Thu 8/20

4:17 pm-9:52 pm

1 stop7h 35m

$325

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Wed 9/9

1:04 pm-9:11 pm

1 stop6h 07m

Milwaukee-Mitchell

Thu 9/17

4:46 pm-10:26 pm

1 stop7h 40m

$327

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Sat 8/1

1:11 pm-11:34 pm

2 stops8h 23m

Milwaukee-Mitchell

Tue 8/4

6:40 pm-11:59 pm

1 stop7h 19m

$328

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Tue 8/11

1:10 pm-9:25 pm

1 stop6h 15m

Milwaukee-Mitchell

Mon 8/24

11:45 am-7:25 pm

2 stops9h 40m

$330

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Sat 8/22

7:05 am-5:00 pm

1 stop7h 55m

Milwaukee-Mitchell

Tue 8/25

5:00 am-12:03 pm

2 stops9h 03m

$332

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Sat 8/22

5:00 am-3:47 pm

2 stops8h 47m

Milwaukee-Mitchell

Tue 8/25

11:48 am-8:01 pm

2 stops10h 13m

$337

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Sat 8/1

7:05 am-7:15 pm

1 stop10h 10m

Milwaukee-Mitchell

Sun 8/16

5:34 am-10:42 am

1 stop7h 08m

$363

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Sun 9/6

12:00 pm-11:53 pm

1 stop9h 53m

Milwaukee-Mitchell

Thu 9/17

4:46 pm-10:26 pm

1 stop7h 40m

$365

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Tue 7/28

4:10 pm-12:55 am

1 stop6h 45m

Milwaukee-Mitchell

Fri 7/31

6:35 pm-12:10 am

2 stops7h 35m

$368

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 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 $396.

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 July 2026, prices for Ontario to Milwaukee flights are approximately 87% 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

6h 10m

Direct flights

None
The fastest flight from Ontario to Milwaukee takes 6h 10m
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 6h 10m, 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 $220Free CancellationRating
7.1
11,784 reviews
Search American Airlines flights
United AirlinesPriceFrom $309Free CancellationRating
7.4
9,938 reviews
Search United Airlines flights
SouthwestPriceFrom $350Free CancellationRating
7.9
4,251 reviews
Search Southwest flights
DeltaPriceFrom $356Free CancellationRating
7.8
8,452 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
West Bend
Pewaukee
Port Washington
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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