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Cheap flights from Ontario to Milwaukee from $133

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 11/21. 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.
Alaska Airlines Logo
4:03 pm - 2:57 pmONT-MKE
20h 54m1 stop
Alaska Airlines Logo
3:53 pm - 8:36 pmMKE-ONT
30h 43m1 stop
$324Alaska Airlines
Find Deal
Thu, Jan 15 - Mon, Jan 19
Delta Logo
7:05 am - 4:16 pmONT-MKE
7h 11m1 stop
Delta Logo
5:20 am - 11:54 amMKE-ONT
8h 34m1 stop
$337Delta
Find Deal
Mon, Dec 15 - Tue, Jan 6
Delta Logo
6:40 am - 9:46 pmONT-MKE
13h 06m2 stops
Delta Logo
5:11 pm - 11:04 pmMKE-ONT
7h 53m1 stop
$345Delta
Find Deal
Fri, Dec 5 - Mon, Dec 8
Southwest Logo
12:35 pm - 11:00 pmONT-MKE
8h 25m1 stop
Southwest Logo
5:10 am - 10:20 amMKE-ONT
7h 10m1 stop
$348Southwest
Find Deal
Wed, Dec 10 - Wed, Jan 14
Southwest Logo
12:35 pm - 11:00 pmONT-MKE
8h 25m1 stop
Southwest Logo
5:10 am - 12:25 pmMKE-ONT
9h 15m2 stops
$353Southwest
Find Deal
Wed, Dec 10 - Wed, Jan 14
American Airlines Logo
9:59 am - 11:01 pmONT-MKE
11h 02m2 stops
American Airlines Logo
7:32 am - 4:05 pmMKE-ONT
10h 33m2 stops
$358American Airlines
Find Deal
Wed, Dec 10 - Wed, Jan 14
Delta Logo
1:00 pm - 9:24 pmONT-MKE
6h 24m1 stop
Delta Logo
10:25 am - 6:15 pmMKE-ONT
9h 50m1 stop
$359Delta
Find Deal
Tue, Apr 14 - Wed, Apr 15
Alaska Airlines Logo
7:33 pm - 2:55 pmONT-MKE
17h 22m1 stop
Alaska Airlines Logo
3:51 pm - 11:19 amMKE-ONT
21h 28m1 stop
$363Alaska Airlines
Find Deal
Fri, Dec 5 - Sun, Dec 7
American Airlines Logo
12:46 pm - 10:05 pmONT-MKE
7h 19m1 stop
American Airlines Logo
5:50 pm - 10:00 pmMKE-ONT
6h 10m1 stop
$368American Airlines
Find Deal
Fri, Dec 5 - Mon, Dec 8
Delta Logo
1:29 pm - 9:46 pmONT-MKE
6h 17m1 stop
Delta Logo
5:20 am - 11:54 amMKE-ONT
8h 34m1 stop
$369Delta
Find Deal
Fri, Dec 12 - Tue, Jan 6

Alaska Airlines flights from Ontario to Milwaukee

Our best Alaska Airlines deals on Ontario to Milwaukee flight tickets
Alaska Airlines
Jan 15
ONT4:03 pmOntario
20h 54m
1 stop
MKE2:57 pmMilwaukee-Mitchell
Jan 19
MKE3:53 pmMilwaukee-Mitchell
30h 43m
1 stop
ONT8:36 pmOntario
$324
Find similar
Alaska Airlines
Dec 5
ONT7:33 pmOntario
17h 22m
1 stop
MKE2:55 pmMilwaukee-Mitchell
Dec 7
MKE3:51 pmMilwaukee-Mitchell
21h 28m
1 stop
ONT11:19 amOntario
$363
Find similar
Alaska Airlines
Dec 15
ONT12:13 pmOntario
24h 42m
1 stop
MKE2:55 pmMilwaukee-Mitchell
Jan 4
MKE7:00 amMilwaukee-Mitchell
28h 50m
1 stop
ONT9:50 amOntario
$383
Find similar

Delta flights from Ontario to Milwaukee

Our best Delta deals on Ontario to Milwaukee flight tickets
Delta
Dec 15
ONT7:05 amOntario
7h 11m
1 stop
MKE4:16 pmMilwaukee-Mitchell
Jan 6
MKE5:20 amMilwaukee-Mitchell
8h 34m
1 stop
ONT11:54 amOntario
$337
Find similar
Delta
Dec 5
ONT6:40 amOntario
13h 06m
2 stops
MKE9:46 pmMilwaukee-Mitchell
Dec 8
MKE5:11 pmMilwaukee-Mitchell
7h 53m
1 stop
ONT11:04 pmOntario
$345
Find similar
Delta
Apr 14
ONT1:00 pmOntario
6h 24m
1 stop
MKE9:24 pmMilwaukee-Mitchell
Apr 15
MKE10:25 amMilwaukee-Mitchell
9h 50m
1 stop
ONT6:15 pmOntario
$359
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 13, 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

Thu 1/15

4:03 pm-2:57 pm

1 stop20h 54m

Milwaukee-Mitchell

Mon 1/19

3:53 pm-8:36 pm

1 stop30h 43m

$324

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Mon 12/15

7:05 am-4:16 pm

1 stop7h 11m

Milwaukee-Mitchell

Tue 1/6

5:20 am-11:54 am

1 stop8h 34m

$337

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Fri 12/5

6:40 am-9:46 pm

2 stops13h 06m

Milwaukee-Mitchell

Mon 12/8

5:11 pm-11:04 pm

1 stop7h 53m

$345

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Wed 12/10

12:35 pm-11:00 pm

1 stop8h 25m

Milwaukee-Mitchell

Wed 1/14

5:10 am-10:20 am

1 stop7h 10m

$348

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Wed 12/10

12:35 pm-11:00 pm

1 stop8h 25m

Milwaukee-Mitchell

Wed 1/14

5:10 am-12:25 pm

2 stops9h 15m

$353

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Wed 12/10

9:59 am-11:01 pm

2 stops11h 02m

Milwaukee-Mitchell

Wed 1/14

7:32 am-4:05 pm

2 stops10h 33m

$358

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Tue 4/14

1:00 pm-9:24 pm

1 stop6h 24m

Milwaukee-Mitchell

Wed 4/15

10:25 am-6:15 pm

1 stop9h 50m

$359

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Fri 12/5

7:33 pm-2:55 pm

1 stop17h 22m

Milwaukee-Mitchell

Sun 12/7

3:51 pm-11:19 am

1 stop21h 28m

$363

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Fri 12/5

12:46 pm-10:05 pm

1 stop7h 19m

Milwaukee-Mitchell

Mon 12/8

5:50 pm-10:00 pm

1 stop6h 10m

$368

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Fri 12/12

1:29 pm-9:46 pm

1 stop6h 17m

Milwaukee-Mitchell

Tue 1/6

5:20 am-11:54 am

1 stop8h 34m

$369

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 55m, 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
8,009 reviews
Search Delta flights
American AirlinesPriceFrom $276Free CancellationRating
7.2
11,049 reviews
Search American Airlines flights
United AirlinesPriceFrom $309Free CancellationRating
7.4
9,015 reviews
Search United Airlines flights
SouthwestPriceFrom $330Free CancellationRating
8.0
4,235 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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