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Cheap flights from Ontario to Milwaukee from $183

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 8/11. 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.
Delta Logo
11:48 am - 9:09 pm
ONT
-
MKE
7h 21m
1 stop
Delta Logo
5:40 am - 10:38 am
MKE
-
ONT
6h 58m
1 stop
$395Delta
ti, heinä 14 - ke, heinä 22
American Airlines Logo
12:41 pm - 11:34 pm
ONT
-
MKE
8h 53m
1 stop
American Airlines Logo
7:16 am - 12:04 pm
MKE
-
ONT
6h 48m
1 stop
$397American Airlines
ti, kesä 16 - ti, kesä 23
Southwest Logo
4:10 pm - 12:55 am
ONT
-
MKE
6h 45m
1 stop
Southwest Logo
6:25 am - 12:55 pm
MKE
-
ONT
8h 30m
2 stops
$400Southwest
ke, kesä 10 - ti, kesä 16
American Airlines Logo
12:41 pm - 11:34 pm
ONT
-
MKE
8h 53m
1 stop
American Airlines Logo
1:28 pm - 9:57 pm
MKE
-
ONT
10h 29m
2 stops
$402American Airlines
ti, kesä 16 - ti, kesä 23
Southwest Logo
8:35 am - 6:30 pm
ONT
-
MKE
7h 55m
2 stops
Southwest Logo
6:40 am - 12:40 pm
MKE
-
ONT
8h 00m
2 stops
$405Southwest
ke, syys 9 - ke, syys 16
Southwest Logo
5:15 am - 3:00 pm
ONT
-
MKE
7h 45m
1 stop
Southwest Logo
6:30 am - 10:20 am
MKE
-
ONT
5h 50m
1 stop
$408Southwest
ke, heinä 15 - la, elo 15
Southwest Logo
12:35 pm - 9:25 pm
ONT
-
MKE
6h 50m
1 stop
Southwest Logo
6:30 am - 10:20 am
MKE
-
ONT
5h 50m
1 stop
$409Southwest
to, elo 6 - la, elo 22
Southwest Logo
10:10 am - 10:00 pm
ONT
-
MKE
9h 50m
2 stops
Southwest Logo
5:00 pm - 8:50 pm
MKE
-
ONT
5h 50m
1 stop
$413Southwest
ke, heinä 15 - la, elo 15
Southwest Logo
5:40 am - 1:10 pm
ONT
-
MKE
5h 30m
1 stop
Southwest Logo
2:10 pm - 8:05 pm
MKE
-
ONT
7h 55m
2 stops
$414Southwest
to, elo 6 - la, elo 22
Southwest Logo
5:30 am - 3:00 pm
ONT
-
MKE
7h 30m
2 stops
Southwest Logo
2:10 pm - 8:50 pm
MKE
-
ONT
8h 40m
2 stops
$418Southwest
ke, heinä 15 - la, elo 15

American Airlines flights from Ontario to Milwaukee

Our best American Airlines deals on Ontario to Milwaukee flight tickets
American Airlines
Jun 16
ONT12:41 pmOntario
8h 53m
1 stop
MKE11:34 pmMilwaukee-Mitchell
Jun 23
MKE7:16 amMilwaukee-Mitchell
6h 48m
1 stop
ONT12:04 pmOntario
$397
American Airlines
Jun 16
ONT12:41 pmOntario
8h 53m
1 stop
MKE11:34 pmMilwaukee-Mitchell
Jun 23
MKE1:28 pmMilwaukee-Mitchell
10h 29m
2 stops
ONT9:57 pmOntario
$402
American Airlines
Aug 6
ONT8:01 pmOntario
9h 48m
2 stops
MKE7:49 amMilwaukee-Mitchell
Aug 22
MKE5:00 amMilwaukee-Mitchell
9h 03m
2 stops
ONT12:03 pmOntario
$419

Southwest flights from Ontario to Milwaukee

Our best Southwest deals on Ontario to Milwaukee flight tickets
Southwest
Jun 10
ONT4:10 pmOntario
6h 45m
1 stop
MKE12:55 amMilwaukee-Mitchell
Jun 16
MKE6:25 amMilwaukee-Mitchell
8h 30m
2 stops
ONT12:55 pmOntario
$400
Southwest
Sep 9
ONT8:35 amOntario
7h 55m
2 stops
MKE6:30 pmMilwaukee-Mitchell
Sep 16
MKE6:40 amMilwaukee-Mitchell
8h 00m
2 stops
ONT12:40 pmOntario
$405
Southwest
Jul 15
ONT5:15 amOntario
7h 45m
1 stop
MKE3:00 pmMilwaukee-Mitchell
Aug 15
MKE6:30 amMilwaukee-Mitchell
5h 50m
1 stop
ONT10:20 amOntario
$408

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 toukokuu 21, 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

ti 7/14

11:48 am-9:09 pm

1 stop7h 21m

Milwaukee-Mitchell

ke 7/22

5:40 am-10:38 am

1 stop6h 58m

$395

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

ti 6/16

12:41 pm-11:34 pm

1 stop8h 53m

Milwaukee-Mitchell

ti 6/23

7:16 am-12:04 pm

1 stop6h 48m

$397

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

ke 6/10

4:10 pm-12:55 am

1 stop6h 45m

Milwaukee-Mitchell

ti 6/16

6:25 am-12:55 pm

2 stops8h 30m

$400

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

ti 6/16

12:41 pm-11:34 pm

1 stop8h 53m

Milwaukee-Mitchell

ti 6/23

1:28 pm-9:57 pm

2 stops10h 29m

$402

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

ke 9/9

8:35 am-6:30 pm

2 stops7h 55m

Milwaukee-Mitchell

ke 9/16

6:40 am-12:40 pm

2 stops8h 00m

$405

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

ke 7/15

5:15 am-3:00 pm

1 stop7h 45m

Milwaukee-Mitchell

la 8/15

6:30 am-10:20 am

1 stop5h 50m

$408
Quickest round-trip

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

to 8/6

12:35 pm-9:25 pm

1 stop6h 50m

Milwaukee-Mitchell

la 8/22

6:30 am-10:20 am

1 stop5h 50m

$409

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

ke 7/15

10:10 am-10:00 pm

2 stops9h 50m

Milwaukee-Mitchell

la 8/15

5:00 pm-8:50 pm

1 stop5h 50m

$413

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

to 8/6

5:40 am-1:10 pm

1 stop5h 30m

Milwaukee-Mitchell

la 8/22

2:10 pm-8:05 pm

2 stops7h 55m

$414

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

ke 7/15

5:30 am-3:00 pm

2 stops7h 30m

Milwaukee-Mitchell

la 8/15

2:10 pm-8:50 pm

2 stops8h 40m

$418

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
1
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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 $191. 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 04m

Direct flights

None
The fastest flight from Ontario to Milwaukee takes 6h 04m
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 04m, 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
8,452 reviews
Search Delta flights
American AirlinesPriceFrom $276Free CancellationRating
7.1
11,641 reviews
Search American Airlines flights
United AirlinesPriceFrom $309Free CancellationRating
7.4
9,748 reviews
Search United Airlines flights
SouthwestPriceFrom $350Free CancellationRating
7.9
4,282 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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