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Cheap flights from Ontario to Milwaukee from $121

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 2/20. 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
12:41 pm - 11:28 pmONT-MKE
8h 47m1 stop
Delta Logo
1:35 pm - 9:05 pmMKE-ONT
9h 30m1 stop
$307Delta
Find Deal
Tue, Jan 6 - Wed, Mar 4
Alaska Airlines Logo
11:53 am - 2:57 pmONT-MKE
25h 04m1 stop
Alaska Airlines Logo
3:47 pm - 10:44 pmMKE-ONT
8h 57m1 stop
$314Alaska Airlines
Find Deal
Wed, Jan 7 - Wed, Mar 4
Alaska Airlines Logo
11:53 am - 2:57 pmONT-MKE
25h 04m1 stop
Alaska Airlines Logo
3:53 pm - 3:08 pmMKE-ONT
25h 15m1 stop
$324Alaska Airlines
Find Deal
Thu, Jan 8 - Mon, Jan 12
Delta Logo
10:30 pm - 9:15 amONT-MKE
8h 45m1 stop
Delta Logo
12:20 pm - 9:05 pmMKE-ONT
10h 45m1 stop
$354Delta
Find Deal
Tue, Jan 6 - Thu, Mar 5
Alaska Airlines Logo
6:00 am - 11:59 pmONT-MKE
15h 59m1 stop
Alaska Airlines Logo
3:47 pm - 10:44 pmMKE-ONT
8h 57m1 stop
$363Alaska Airlines
Find Deal
Mon, Jan 5 - Wed, Mar 4
Alaska Airlines Logo
6:00 am - 11:59 pmONT-MKE
15h 59m1 stop
Alaska Airlines Logo
3:47 pm - 11:32 pmMKE-ONT
9h 45m1 stop
$373Alaska Airlines
Find Deal
Mon, Jan 5 - Mon, Mar 2
United Airlines Logo
5:05 am - 3:00 pmONT-MKE
7h 55m1 stop
United Airlines Logo
4:11 pm - 9:08 pmMKE-ONT
6h 57m1 stop
$387United Airlines
Find Deal
Thu, Jan 1 - Mon, Jan 5
United Airlines Logo
5:05 am - 3:00 pmONT-MKE
7h 55m1 stop
United Airlines Logo
12:02 pm - 9:08 pmMKE-ONT
11h 06m2 stops
$392United Airlines
Find Deal
Thu, Jan 1 - Mon, Jan 5
Alaska Airlines Logo
6:00 am - 11:59 pmONT-MKE
15h 59m1 stop
Alaska Airlines Logo
3:47 pm - 11:32 pmMKE-ONT
9h 45m1 stop
$393Alaska Airlines
Find Deal
Mon, Jan 5 - Fri, Mar 6
United Airlines Logo
5:05 am - 1:30 pmONT-MKE
6h 25m1 stop
United Airlines Logo
4:10 pm - 8:50 pmMKE-ONT
6h 40m1 stop
$397United Airlines
Find Deal
Tue, Jan 6 - Mon, Mar 2

Delta flights from Ontario to Milwaukee

Our best Delta deals on Ontario to Milwaukee flight tickets
Delta
Jan 6
ONT12:41 pmOntario
8h 47m
1 stop
MKE11:28 pmMilwaukee-Mitchell
Mar 4
MKE1:35 pmMilwaukee-Mitchell
9h 30m
1 stop
ONT9:05 pmOntario
$307
Find similar
Delta
Jan 6
ONT10:30 pmOntario
8h 45m
1 stop
MKE9:15 amMilwaukee-Mitchell
Mar 5
MKE12:20 pmMilwaukee-Mitchell
10h 45m
1 stop
ONT9:05 pmOntario
$354
Find similar
Delta
Jan 5
ONT1:10 pmOntario
6h 05m
1 stop
MKE9:15 pmMilwaukee-Mitchell
Mar 3
MKE1:35 pmMilwaukee-Mitchell
9h 30m
1 stop
ONT9:05 pmOntario
$413
Find similar

Alaska Airlines flights from Ontario to Milwaukee

Our best Alaska Airlines deals on Ontario to Milwaukee flight tickets
Alaska Airlines
Jan 7
ONT11:53 amOntario
25h 04m
1 stop
MKE2:57 pmMilwaukee-Mitchell
Mar 4
MKE3:47 pmMilwaukee-Mitchell
8h 57m
1 stop
ONT10:44 pmOntario
$314
Find similar
Alaska Airlines
Jan 8
ONT11:53 amOntario
25h 04m
1 stop
MKE2:57 pmMilwaukee-Mitchell
Jan 12
MKE3:53 pmMilwaukee-Mitchell
25h 15m
1 stop
ONT3:08 pmOntario
$324
Find similar
Alaska Airlines
Jan 5
ONT6:00 amOntario
15h 59m
1 stop
MKE11:59 pmMilwaukee-Mitchell
Mar 4
MKE3:47 pmMilwaukee-Mitchell
8h 57m
1 stop
ONT10:44 pmOntario
$363
Find similar

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 November 24, 2025.
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

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Tue 1/6

12:41 pm-11:28 pm

1 stop8h 47m

Milwaukee-Mitchell

Wed 3/4

1:35 pm-9:05 pm

1 stop9h 30m

$307

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Wed 1/7

11:53 am-2:57 pm

1 stop25h 04m

Milwaukee-Mitchell

Wed 3/4

3:47 pm-10:44 pm

1 stop8h 57m

$314

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Thu 1/8

11:53 am-2:57 pm

1 stop25h 04m

Milwaukee-Mitchell

Mon 1/12

3:53 pm-3:08 pm

1 stop25h 15m

$324

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Tue 1/6

10:30 pm-9:15 am

1 stop8h 45m

Milwaukee-Mitchell

Thu 3/5

12:20 pm-9:05 pm

1 stop10h 45m

$354

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Mon 1/5

6:00 am-11:59 pm

1 stop15h 59m

Milwaukee-Mitchell

Wed 3/4

3:47 pm-10:44 pm

1 stop8h 57m

$363

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Mon 1/5

6:00 am-11:59 pm

1 stop15h 59m

Milwaukee-Mitchell

Mon 3/2

3:47 pm-11:32 pm

1 stop9h 45m

$373

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Thu 1/1

5:05 am-3:00 pm

1 stop7h 55m

Milwaukee-Mitchell

Mon 1/5

4:11 pm-9:08 pm

1 stop6h 57m

$387

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Thu 1/1

5:05 am-3:00 pm

1 stop7h 55m

Milwaukee-Mitchell

Mon 1/5

12:02 pm-9:08 pm

2 stops11h 06m

$392

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Mon 1/5

6:00 am-11:59 pm

1 stop15h 59m

Milwaukee-Mitchell

Fri 3/6

3:47 pm-11:32 pm

1 stop9h 45m

$393

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Tue 1/6

5:05 am-1:30 pm

1 stop6h 25m

Milwaukee-Mitchell

Mon 3/2

4:10 pm-8:50 pm

1 stop6h 40m

$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 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 $375.

What is the cheapest day to depart on your flight to Milwaukee?

According to our data, Thursday is the cheapest day to fly to Milwaukee from Ontario. The lowest ticket price found for a Thursday departure recently was $181. 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 Saturday will generally be more expensive and average around $408. Keep in mind that these prices on both days could fluctuate depending on the season and the demand.

What is the cheapest time of day to depart on your flight to Milwaukee?

In the morning is the cheapest time of day to fly from Ontario to Milwaukee when you can find flight prices for as low as $180. Flying to Milwaukee in the morning is an ideal time because this is during off-peak travel hours. In the afternoon is when there is more demand to fly to Milwaukee, so prices are often more expensive at around $463 per ticket.

How have Ontario to Milwaukee flight prices changed over time?

As of November 2025, prices for Ontario to Milwaukee flights are approximately 89% 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

Direct flights

None
There are no direct flights from Ontario to Milwaukee. There are no popular flight routes from Ontario to Milwaukee.
Search flight deals

  • 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 30m, 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
7,998 reviews
Search Delta flights
American AirlinesPriceFrom $276Free CancellationRating
7.2
11,042 reviews
Search American Airlines flights
United AirlinesPriceFrom $309Free CancellationRating
7.4
9,044 reviews
Search United Airlines flights
SouthwestPriceFrom $330Free CancellationRating
8.0
4,252 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
Kohler
Pewaukee
West Bend
Port Washington
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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