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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 9/30. 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.
United Airlines Logo
1:18 pm - 9:03 pm
ONT
-
MKE
5h 45m
1 stop
United Airlines Logo
5:17 pm - 10:35 pm
MKE
-
ONT
7h 18m
1 stop
$323United Airlines
Thu, Aug 27 - Thu, Sep 3
United Airlines Logo
7:00 am - 5:30 pm
ONT
-
MKE
8h 30m
1 stop
United Airlines Logo
2:40 pm - 8:53 pm
MKE
-
ONT
8h 13m
1 stop
$323United Airlines
Sat, Sep 12 - Wed, Sep 16
Southwest Logo
12:40 pm - 10:45 pm
ONT
-
MKE
8h 05m
1 stop
Southwest Logo
5:30 am - 9:55 am
MKE
-
ONT
6h 25m
1 stop
$323Southwest
Mon, Oct 19 - Thu, Oct 22
Southwest Logo
10:55 am - 6:35 pm
ONT
-
MKE
5h 40m
1 stop
Southwest Logo
6:10 pm - 10:00 pm
MKE
-
ONT
5h 50m
1 stop
$323Southwest
Tue, Sep 29 - Tue, Oct 6
Delta Logo
12:00 pm - 11:53 pm
ONT
-
MKE
9h 53m
1 stop
Delta Logo
7:30 am - 12:16 pm
MKE
-
ONT
6h 46m
1 stop
$323Delta
Sat, Aug 22 - Sat, Aug 29
Delta Logo
10:00 pm - 9:06 am
ONT
-
MKE
9h 06m
1 stop
Delta Logo
12:45 pm - 8:24 pm
MKE
-
ONT
9h 39m
1 stop
$323Delta
Mon, Sep 14 - Wed, Sep 16
Southwest Logo
5:45 am - 1:25 pm
ONT
-
MKE
5h 40m
1 stop
Southwest Logo
6:20 am - 10:15 am
MKE
-
ONT
5h 55m
1 stop
$323Southwest
Tue, Aug 25 - Tue, Sep 1
American Airlines Logo
6:00 am - 5:00 pm
ONT
-
MKE
9h 00m
1 stop
American Airlines Logo
2:45 pm - 6:17 pm
MKE
-
ONT
5h 32m
1 stop
$328American Airlines
Sun, Sep 6 - Sat, Sep 12
American Airlines Logo
8:01 pm - 7:49 am
ONT
-
MKE
9h 48m
2 stops
American Airlines Logo
7:01 am - 1:25 pm
MKE
-
ONT
8h 24m
1 stop
$333American Airlines
Sun, Sep 6 - Sat, Sep 12
United Airlines Logo
1:18 pm - 11:59 pm
ONT
-
MKE
8h 41m
1 stop
United Airlines Logo
2:35 pm - 8:53 pm
MKE
-
ONT
8h 18m
1 stop
$423United Airlines
Wed, Aug 26 - Thu, Aug 27

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Alaska Airlines flights from Ontario to Milwaukee

Our best Alaska Airlines deals on Ontario to Milwaukee flight tickets
Alaska Airlines
Aug 5
ONT12:04 pmOntario
9h 55m
1 stop
MKE11:59 pmMilwaukee-Mitchell
Aug 18
MKE6:02 amMilwaukee-Mitchell
9h 07m
1 stop
ONT1:09 pmOntario
$440
Alaska Airlines
Aug 4
ONT12:04 pmOntario
9h 55m
1 stop
MKE11:59 pmMilwaukee-Mitchell
Aug 18
MKE6:02 amMilwaukee-Mitchell
9h 07m
1 stop
ONT1:09 pmOntario
$445
Alaska Airlines
Aug 11
ONT12:04 pmOntario
9h 55m
1 stop
MKE11:59 pmMilwaukee-Mitchell
Aug 19
MKE7:02 amMilwaukee-Mitchell
9h 07m
1 stop
ONT2:09 pmOntario
$463

Southwest flights from Ontario to Milwaukee

Our best Southwest deals on Ontario to Milwaukee flight tickets
Southwest
Sep 6
ONT7:05 amOntario
5h 40m
1 stop
MKE2:45 pmMilwaukee-Mitchell
Sep 12
MKE1:15 pmMilwaukee-Mitchell
6h 10m
1 stop
ONT5:25 pmOntario
$328
Southwest
Oct 15
ONT1:30 pmOntario
8h 35m
1 stop
MKE12:05 amMilwaukee-Mitchell
Oct 19
MKE5:00 pmMilwaukee-Mitchell
8h 45m
2 stops
ONT11:45 pmOntario
$334
Southwest
Sep 6
ONT12:05 pmOntario
7h 15m
2 stops
MKE9:20 pmMilwaukee-Mitchell
Sep 12
MKE6:30 amMilwaukee-Mitchell
9h 45m
2 stops
ONT2:15 pmOntario
$338

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 31, 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

Thu 8/27

1:18 pm-9:03 pm

1 stop5h 45m

Milwaukee-Mitchell

Thu 9/3

5:17 pm-10:35 pm

1 stop7h 18m

$323

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Sat 9/12

7:00 am-5:30 pm

1 stop8h 30m

Milwaukee-Mitchell

Wed 9/16

2:40 pm-8:53 pm

1 stop8h 13m

$323

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Mon 10/19

12:40 pm-10:45 pm

1 stop8h 05m

Milwaukee-Mitchell

Thu 10/22

5:30 am-9:55 am

1 stop6h 25m

$323
Quickest round-trip

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Tue 9/29

10:55 am-6:35 pm

1 stop5h 40m

Milwaukee-Mitchell

Tue 10/6

6:10 pm-10:00 pm

1 stop5h 50m

$323

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Sat 8/22

12:00 pm-11:53 pm

1 stop9h 53m

Milwaukee-Mitchell

Sat 8/29

7:30 am-12:16 pm

1 stop6h 46m

$323

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Mon 9/14

10:00 pm-9:06 am

1 stop9h 06m

Milwaukee-Mitchell

Wed 9/16

12:45 pm-8:24 pm

1 stop9h 39m

$323

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Tue 8/25

5:45 am-1:25 pm

1 stop5h 40m

Milwaukee-Mitchell

Tue 9/1

6:20 am-10:15 am

1 stop5h 55m

$323

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Sun 9/6

6:00 am-5:00 pm

1 stop9h 00m

Milwaukee-Mitchell

Sat 9/12

2:45 pm-6:17 pm

1 stop5h 32m

$328

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Sun 9/6

8:01 pm-7:49 am

2 stops9h 48m

Milwaukee-Mitchell

Sat 9/12

7:01 am-1:25 pm

1 stop8h 24m

$333

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Wed 8/26

1:18 pm-11:59 pm

1 stop8h 41m

Milwaukee-Mitchell

Thu 8/27

2:35 pm-8:53 pm

1 stop8h 18m

$423

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

5h 25m

Direct flights

None
The fastest flight from Ontario to Milwaukee takes 5h 25m
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 25m, 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
11,842 reviews
Search American Airlines flights
United AirlinesPriceFrom $309Free CancellationRating
7.4
10,046 reviews
Search United Airlines flights
SouthwestPriceFrom $350Free CancellationRating
8.0
4,227 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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