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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 9/5. 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.
Southwest Logo
1:50 pm - 9:25 pm-
5h 35m
Southwest Logo
6:10 pm - 10:00 pm-
5h 50m
$323Southwest
Tue, Sep 29 - Tue, Oct 6
Southwest Logo
1:50 pm - 9:25 pm-
5h 35m
Southwest Logo
5:55 am - 12:55 pm-
9h 00m
$328Southwest
Tue, Sep 29 - Tue, Oct 6
Southwest Logo
10:55 am - 9:25 pm-
8h 30m
Southwest Logo
7:30 am - 3:40 pm-
10h 10m
$333Southwest
Tue, Sep 29 - Tue, Oct 6
American Airlines Logo
8:25 am - 4:53 pm-
6h 28m
American Airlines Logo
5:47 pm - 10:40 pm-
6h 53m
$347American Airlines
Tue, Sep 29 - Tue, Oct 6
American Airlines Logo
6:00 am - 4:53 pm-
8h 53m
American Airlines Logo
12:22 pm - 6:53 pm-
8h 31m
$347American Airlines
Tue, Sep 22 - Tue, Sep 29
United Airlines Logo
7:00 am - 3:11 pm-
6h 11m
United Airlines Logo
3:52 pm - 10:49 pm-
8h 57m
$347United Airlines
Thu, Oct 15 - Mon, Oct 19
Delta Logo
7:05 am - 4:14 pm-
7h 09m
Delta Logo
5:30 am - 11:05 am-
7h 35m
$347Delta
Mon, Aug 31 - Tue, Sep 15
Delta Logo
7:05 am - 4:14 pm-
7h 09m
Delta Logo
5:30 am - 11:05 am-
7h 35m
$347Delta
Mon, Aug 31 - Sat, Sep 12
United Airlines Logo
5:00 am - 1:34 pm-
6h 34m
United Airlines Logo
10:42 am - 5:41 pm-
8h 59m
$352United Airlines
Tue, Sep 22 - Tue, Sep 29
United Airlines Logo
7:00 am - 2:58 pm-
5h 58m
United Airlines Logo
2:35 pm - 10:48 pm-
10h 13m
$387United Airlines
Fri, Nov 13 - Mon, Nov 16

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Delta flights from Ontario to Milwaukee

Our best Delta deals on Ontario to Milwaukee flight tickets
Delta
Aug 29
ONT1:06 pmOntario
6h 35m
1 stop
MKE9:41 pmMilwaukee-Mitchell
Sep 17
MKE4:49 pmMilwaukee-Mitchell
7h 35m
1 stop
ONT10:24 pmOntario
$347
Delta
Sep 22
ONT12:17 pmOntario
7h 13m
1 stop
MKE9:30 pmMilwaukee-Mitchell
Sep 26
MKE5:30 amMilwaukee-Mitchell
7h 35m
1 stop
ONT11:05 amOntario
$373
Delta
Aug 19
ONT7:05 amOntario
7h 08m
1 stop
MKE4:13 pmMilwaukee-Mitchell
Aug 22
MKE12:47 pmMilwaukee-Mitchell
7h 43m
1 stop
ONT6:30 pmOntario
$379

Alaska Airlines flights from Ontario to Milwaukee

Our best Alaska Airlines deals on Ontario to Milwaukee flight tickets
Alaska Airlines
Aug 28
ONT12:00 pmOntario
9h 59m
1 stop
MKE11:59 pmMilwaukee-Mitchell
Aug 31
MKE7:02 amMilwaukee-Mitchell
9h 07m
1 stop
ONT2:09 pmOntario
$479
Alaska Airlines
Aug 31
ONT7:59 pmOntario
12h 58m
2 stops
MKE10:57 amMilwaukee-Mitchell
Sep 15
MKE8:31 amMilwaukee-Mitchell
12h 32m
2 stops
ONT7:03 pmOntario
$483
Alaska Airlines
Aug 31
ONT7:59 pmOntario
12h 58m
2 stops
MKE10:57 amMilwaukee-Mitchell
Sep 18
MKE1:18 pmMilwaukee-Mitchell
12h 06m
2 stops
ONT11:24 pmOntario
$492

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 August 5, 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 9/29

1:50 pm-9:25 pm

1 stop5h 35m

Milwaukee-Mitchell

Tue 10/6

6:10 pm-10:00 pm

1 stop5h 50m

$323

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Tue 9/29

1:50 pm-9:25 pm

1 stop5h 35m

Milwaukee-Mitchell

Tue 10/6

5:55 am-12:55 pm

2 stops9h 00m

$328

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Tue 9/29

10:55 am-9:25 pm

2 stops8h 30m

Milwaukee-Mitchell

Tue 10/6

7:30 am-3:40 pm

2 stops10h 10m

$333

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Tue 9/29

8:25 am-4:53 pm

1 stop6h 28m

Milwaukee-Mitchell

Tue 10/6

5:47 pm-10:40 pm

1 stop6h 53m

$347

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Tue 9/22

6:00 am-4:53 pm

1 stop8h 53m

Milwaukee-Mitchell

Tue 9/29

12:22 pm-6:53 pm

1 stop8h 31m

$347

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Thu 10/15

7:00 am-3:11 pm

1 stop6h 11m

Milwaukee-Mitchell

Mon 10/19

3:52 pm-10:49 pm

1 stop8h 57m

$347

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Mon 8/31

7:05 am-4:14 pm

1 stop7h 09m

Milwaukee-Mitchell

Tue 9/15

5:30 am-11:05 am

1 stop7h 35m

$347

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Mon 8/31

7:05 am-4:14 pm

1 stop7h 09m

Milwaukee-Mitchell

Sat 9/12

5:30 am-11:05 am

1 stop7h 35m

$347

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Tue 9/22

5:00 am-1:34 pm

1 stop6h 34m

Milwaukee-Mitchell

Tue 9/29

10:42 am-5:41 pm

2 stops8h 59m

$352

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Fri 11/13

7:00 am-2:58 pm

1 stop5h 58m

Milwaukee-Mitchell

Mon 11/16

2:35 pm-10:48 pm

2 stops10h 13m

$387

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 August 2026, prices for Ontario to Milwaukee flights are approximately 16% cheaper 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 00m

Direct flights

None
The fastest flight from Ontario to Milwaukee takes 6h 00m
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 00m, 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
11,852 reviews
Search American Airlines flights
United AirlinesPriceFrom $309Free CancellationRating
7.4
10,060 reviews
Search United Airlines flights
SouthwestPriceFrom $350Free CancellationRating
8.0
4,220 reviews
Search Southwest 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
Port Washington
Pewaukee
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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