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Cheap flights from Ontario to Milwaukee from $137

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 4/16. 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

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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.
Frontier Logo
12:59 am - 5:34 pm
ONT
-
MKE
14h 35m
1 stop
Frontier Logo
5:05 pm - 11:55 pm
MKE
-
ONT
8h 50m
1 stop
$211Frontier
Thu, Apr 23 - Mon, Apr 27
Alaska Airlines Logo
6:00 am - 3:44 pm
ONT
-
MKE
7h 44m
1 stop
Alaska Airlines Logo
7:00 am - 3:09 pm
MKE
-
ONT
10h 09m
1 stop
$357Alaska Airlines
Wed, May 13 - Tue, May 19
American Airlines Logo
11:59 pm - 10:59 am
ONT
-
MKE
9h 00m
1 stop
American Airlines Logo
7:08 am - 1:18 pm
MKE
-
ONT
8h 10m
1 stop
$367American Airlines
Tue, May 12 - Sat, May 16
American Airlines Logo
11:59 pm - 10:59 am
ONT
-
MKE
9h 00m
1 stop
American Airlines Logo
11:13 am - 7:34 pm
MKE
-
ONT
10h 21m
2 stops
$372American Airlines
Tue, May 12 - Sat, May 16
American Airlines Logo
1:10 pm - 9:37 pm
ONT
-
MKE
6h 27m
1 stop
American Airlines Logo
7:18 am - 11:51 am
MKE
-
ONT
6h 33m
1 stop
$377American Airlines
Sat, May 30 - Sat, Jun 6
American Airlines Logo
9:24 am - 10:27 pm
ONT
-
MKE
11h 03m
2 stops
American Airlines Logo
11:13 am - 7:34 pm
MKE
-
ONT
10h 21m
2 stops
$378American Airlines
Tue, May 12 - Sat, May 16
American Airlines Logo
2:18 pm - 11:34 pm
ONT
-
MKE
7h 16m
1 stop
American Airlines Logo
12:11 pm - 10:02 pm
MKE
-
ONT
11h 51m
2 stops
$382American Airlines
Sat, May 30 - Sat, Jun 6
American Airlines Logo
9:24 am - 10:27 pm
ONT
-
MKE
11h 03m
2 stops
American Airlines Logo
5:46 pm - 9:59 pm
MKE
-
ONT
6h 13m
1 stop
$384American Airlines
Wed, May 13 - Thu, May 14
American Airlines Logo
6:10 am - 5:44 pm
ONT
-
MKE
9h 34m
2 stops
American Airlines Logo
12:11 pm - 10:02 pm
MKE
-
ONT
11h 51m
2 stops
$387American Airlines
Sat, May 30 - Sat, Jun 6
Delta Logo
10:15 pm - 9:05 am
ONT
-
MKE
8h 50m
1 stop
Delta Logo
5:30 am - 11:36 am
MKE
-
ONT
8h 06m
1 stop
$397Delta
Thu, Apr 30 - Mon, May 4

Southwest flights from Ontario to Milwaukee

Our best Southwest deals on Ontario to Milwaukee flight tickets
Southwest
Jun 13
ONT9:50 amOntario
5h 10m
1 stop
MKE5:00 pmMilwaukee-Mitchell
Jun 17
MKE6:10 amMilwaukee-Mitchell
9h 55m
1 stop
ONT2:05 pmOntario
$418
Southwest
Jun 13
ONT3:00 pmOntario
7h 20m
1 stop
MKE12:20 amMilwaukee-Mitchell
Jun 17
MKE6:10 amMilwaukee-Mitchell
9h 55m
1 stop
ONT2:05 pmOntario
$422
Southwest
May 7
ONT5:30 amOntario
6h 20m
1 stop
MKE1:50 pmMilwaukee-Mitchell
May 10
MKE10:10 amMilwaukee-Mitchell
9h 35m
1 stop
ONT5:45 pmOntario
$427

Alaska Airlines flights from Ontario to Milwaukee

Our best Alaska Airlines deals on Ontario to Milwaukee flight tickets
Alaska Airlines
May 13
ONT6:00 amOntario
7h 44m
1 stop
MKE3:44 pmMilwaukee-Mitchell
May 19
MKE7:00 amMilwaukee-Mitchell
10h 09m
1 stop
ONT3:09 pmOntario
$357
Alaska Airlines
May 15
ONT4:03 pmOntario
21h 41m
1 stop
MKE3:44 pmMilwaukee-Mitchell
May 19
MKE7:00 amMilwaukee-Mitchell
10h 09m
1 stop
ONT3:09 pmOntario
$417
Alaska Airlines
May 12
ONT2:59 pmOntario
22h 45m
2 stops
MKE3:44 pmMilwaukee-Mitchell
May 18
MKE4:40 pmMilwaukee-Mitchell
9h 18m
1 stop
ONT11:58 pmOntario
$425

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 April 10, 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 4/23

12:59 am-5:34 pm

1 stop14h 35m

Milwaukee-Mitchell

Mon 4/27

5:05 pm-11:55 pm

1 stop8h 50m

$211

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Wed 5/13

6:00 am-3:44 pm

1 stop7h 44m

Milwaukee-Mitchell

Tue 5/19

7:00 am-3:09 pm

1 stop10h 09m

$357

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Tue 5/12

11:59 pm-10:59 am

1 stop9h 00m

Milwaukee-Mitchell

Sat 5/16

7:08 am-1:18 pm

1 stop8h 10m

$367

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Tue 5/12

11:59 pm-10:59 am

1 stop9h 00m

Milwaukee-Mitchell

Sat 5/16

11:13 am-7:34 pm

2 stops10h 21m

$372
Quickest round-trip

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Sat 5/30

1:10 pm-9:37 pm

1 stop6h 27m

Milwaukee-Mitchell

Sat 6/6

7:18 am-11:51 am

1 stop6h 33m

$377

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Tue 5/12

9:24 am-10:27 pm

2 stops11h 03m

Milwaukee-Mitchell

Sat 5/16

11:13 am-7:34 pm

2 stops10h 21m

$378

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Sat 5/30

2:18 pm-11:34 pm

1 stop7h 16m

Milwaukee-Mitchell

Sat 6/6

12:11 pm-10:02 pm

2 stops11h 51m

$382

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Wed 5/13

9:24 am-10:27 pm

2 stops11h 03m

Milwaukee-Mitchell

Thu 5/14

5:46 pm-9:59 pm

1 stop6h 13m

$384

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Sat 5/30

6:10 am-5:44 pm

2 stops9h 34m

Milwaukee-Mitchell

Sat 6/6

12:11 pm-10:02 pm

2 stops11h 51m

$387

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Thu 4/30

10:15 pm-9:05 am

1 stop8h 50m

Milwaukee-Mitchell

Mon 5/4

5:30 am-11:36 am

1 stop8h 06m

$397

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 May is another great option to travel to Milwaukee, with average flight prices from Ontario averaging around $384.

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 $180. 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 April 2026, prices for Ontario to Milwaukee flights are approximately 160% 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 38m

Direct flights

None
The fastest flight from Ontario to Milwaukee takes 5h 38m
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 38m, 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
8,398 reviews
Search Delta flights
American AirlinesPriceFrom $276Free CancellationRating
7.1
11,564 reviews
Search American Airlines flights
United AirlinesPriceFrom $309Free CancellationRating
7.4
9,562 reviews
Search United Airlines flights
SouthwestPriceFrom $326Free CancellationRating
8.0
4,334 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
West Bend
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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