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Cheap flights from Ontario to Milwaukee from $174

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 9/1. 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
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.
Southwest Logo
1:30 pm - 11:55 pm
ONT
-
MKE
8h 25m
1 stop
Southwest Logo
7:05 pm - 11:05 pm
MKE
-
ONT
6h 00m
1 stop
$391Southwest
Tue, Jul 21 - Wed, Jul 29
Delta Logo
10:00 pm - 9:06 am
ONT
-
MKE
9h 06m
1 stop
Delta Logo
5:34 am - 10:42 am
MKE
-
ONT
7h 08m
1 stop
$395Delta
Wed, Jul 29 - Tue, Aug 11
Southwest Logo
4:10 pm - 12:55 am
ONT
-
MKE
6h 45m
1 stop
Southwest Logo
4:10 pm - 10:20 pm
MKE
-
ONT
8h 10m
2 stops
$396Southwest
Tue, Jul 21 - Wed, Jul 29
Southwest Logo
5:30 am - 3:00 pm
ONT
-
MKE
7h 30m
2 stops
Southwest Logo
6:25 am - 12:55 pm
MKE
-
ONT
8h 30m
2 stops
$401Southwest
Tue, Jul 21 - Wed, Jul 29
Delta Logo
12:55 pm - 9:41 pm
ONT
-
MKE
6h 46m
1 stop
Delta Logo
10:24 am - 6:29 pm
MKE
-
ONT
10h 05m
1 stop
$406Delta
Tue, Aug 4 - Sat, Aug 15
Delta Logo
12:00 pm - 11:53 pm
ONT
-
MKE
9h 53m
1 stop
Delta Logo
7:30 am - 12:05 pm
MKE
-
ONT
6h 35m
1 stop
$408Delta
Thu, Aug 6 - Tue, Aug 11
Southwest Logo
5:40 am - 1:10 pm
ONT
-
MKE
5h 30m
1 stop
Southwest Logo
6:40 am - 12:40 pm
MKE
-
ONT
8h 00m
2 stops
$411Southwest
Thu, Sep 24 - Tue, Sep 29
Southwest Logo
9:55 am - 9:25 pm
ONT
-
MKE
9h 30m
2 stops
Southwest Logo
3:40 pm - 8:55 pm
MKE
-
ONT
7h 15m
2 stops
$416Southwest
Thu, Sep 24 - Tue, Sep 29
Alaska Airlines Logo
6:00 am - 3:48 pm
ONT
-
MKE
7h 48m
1 stop
Alaska Airlines Logo
4:44 pm - 10:54 pm
MKE
-
ONT
8h 10m
1 stop
$421Alaska Airlines
Thu, Nov 12 - Mon, Nov 16
Southwest Logo
5:20 am - 12:40 pm
ONT
-
MKE
5h 20m
1 stop
Southwest Logo
6:00 am - 12:05 pm
MKE
-
ONT
8h 05m
2 stops
$422Southwest
Thu, Oct 22 - Mon, Oct 26

Delta flights from Ontario to Milwaukee

Our best Delta deals on Ontario to Milwaukee flight tickets
Delta
Jul 29
ONT10:00 pmOntario
9h 06m
1 stop
MKE9:06 amMilwaukee-Mitchell
Aug 11
MKE5:34 amMilwaukee-Mitchell
7h 08m
1 stop
ONT10:42 amOntario
$395
Delta
Aug 4
ONT12:55 pmOntario
6h 46m
1 stop
MKE9:41 pmMilwaukee-Mitchell
Aug 15
MKE10:24 amMilwaukee-Mitchell
10h 05m
1 stop
ONT6:29 pmOntario
$406
Delta
Aug 6
ONT12:00 pmOntario
9h 53m
1 stop
MKE11:53 pmMilwaukee-Mitchell
Aug 11
MKE7:30 amMilwaukee-Mitchell
6h 35m
1 stop
ONT12:05 pmOntario
$408

United Airlines flights from Ontario to Milwaukee

Our best United Airlines deals on Ontario to Milwaukee flight tickets
United Airlines
Sep 1
ONT5:00 amOntario
6h 29m
1 stop
MKE1:29 pmMilwaukee-Mitchell
Sep 2
MKE10:44 amMilwaukee-Mitchell
11h 17m
2 stops
ONT8:01 pmOntario
$496
United Airlines
Jun 5
ONT5:00 amOntario
6h 25m
1 stop
MKE1:25 pmMilwaukee-Mitchell
Jun 8
MKE2:35 pmMilwaukee-Mitchell
8h 11m
1 stop
ONT8:46 pmOntario
$728
United Airlines
Jun 4
ONT1:18 pmOntario
8h 41m
1 stop
MKE11:59 pmMilwaukee-Mitchell
Jun 11
MKE8:50 amMilwaukee-Mitchell
10h 38m
2 stops
ONT5:28 pmOntario
$775

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 May 26, 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

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Tue 7/21

1:30 pm-11:55 pm

1 stop8h 25m

Milwaukee-Mitchell

Wed 7/29

7:05 pm-11:05 pm

1 stop6h 00m

$391

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Wed 7/29

10:00 pm-9:06 am

1 stop9h 06m

Milwaukee-Mitchell

Tue 8/11

5:34 am-10:42 am

1 stop7h 08m

$395

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Tue 7/21

4:10 pm-12:55 am

1 stop6h 45m

Milwaukee-Mitchell

Wed 7/29

4:10 pm-10:20 pm

2 stops8h 10m

$396

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Tue 7/21

5:30 am-3:00 pm

2 stops7h 30m

Milwaukee-Mitchell

Wed 7/29

6:25 am-12:55 pm

2 stops8h 30m

$401

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Tue 8/4

12:55 pm-9:41 pm

1 stop6h 46m

Milwaukee-Mitchell

Sat 8/15

10:24 am-6:29 pm

1 stop10h 05m

$406

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Thu 8/6

12:00 pm-11:53 pm

1 stop9h 53m

Milwaukee-Mitchell

Tue 8/11

7:30 am-12:05 pm

1 stop6h 35m

$408

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Thu 9/24

5:40 am-1:10 pm

1 stop5h 30m

Milwaukee-Mitchell

Tue 9/29

6:40 am-12:40 pm

2 stops8h 00m

$411

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Thu 9/24

9:55 am-9:25 pm

2 stops9h 30m

Milwaukee-Mitchell

Tue 9/29

3:40 pm-8:55 pm

2 stops7h 15m

$416

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Thu 11/12

6:00 am-3:48 pm

1 stop7h 48m

Milwaukee-Mitchell

Mon 11/16

4:44 pm-10:54 pm

1 stop8h 10m

$421
Quickest round-trip

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Thu 10/22

5:20 am-12:40 pm

1 stop5h 20m

Milwaukee-Mitchell

Mon 10/26

6:00 am-12:05 pm

2 stops8h 05m

$422

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 August is another great option to travel to Milwaukee, with average flight prices from Ontario averaging around $393.

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 May 2026, prices for Ontario to Milwaukee flights are approximately 183% 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
DeltaPriceFrom $253Free CancellationRating
7.9
8,425 reviews
Search Delta flights
American AirlinesPriceFrom $276Free CancellationRating
7.1
11,629 reviews
Search American Airlines flights
United AirlinesPriceFrom $309Free CancellationRating
7.4
9,749 reviews
Search United Airlines flights
SouthwestPriceFrom $350Free CancellationRating
8.0
4,266 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
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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