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Cheap flights from Ontario to Milwaukee from $117

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 11/10. 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.
Frontier Logo
6:53 am - 7:19 pmONT-MKE
10h 26m1 stop
Frontier Logo
8:04 pm - 9:27 pmMKE-ONT
27h 23m1 stop
$177Frontier
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Mon, Nov 10 - Mon, Nov 17
Frontier Logo
6:53 am - 7:19 pmONT-MKE
10h 26m1 stop
Frontier Logo
8:04 pm - 11:50 pmMKE-ONT
5h 46m1 stop
$236Frontier
Find Deal
Mon, Nov 10 - Mon, Nov 17
United Airlines Logo
5:05 am - 2:19 pmONT-MKE
7h 14m1 stop
United Airlines Logo
5:00 am - 12:17 pmMKE-ONT
9h 17m2 stops
$356United Airlines
Find Deal
Thu, Dec 11 - Mon, Dec 15
Southwest Logo
7:00 am - 5:30 pmONT-MKE
8h 30m2 stops
Southwest Logo
1:00 pm - 8:55 pmMKE-ONT
9h 55m2 stops
$361Southwest
Find Deal
Thu, Dec 11 - Mon, Dec 15
American Airlines Logo
6:11 am - 2:24 pmONT-MKE
6h 13m1 stop
American Airlines Logo
5:50 pm - 9:59 pmMKE-ONT
6h 09m1 stop
$393American Airlines
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Thu, Nov 27 - Mon, Dec 1
United Airlines Logo
1:34 pm - 9:30 pmONT-MKE
5h 56m1 stop
United Airlines Logo
4:05 pm - 9:49 pmMKE-ONT
7h 44m1 stop
$395United Airlines
Find Deal
Tue, Dec 2 - Fri, Dec 5
American Airlines Logo
9:59 am - 9:31 pmONT-MKE
9h 32m2 stops
American Airlines Logo
8:53 am - 4:02 pmMKE-ONT
9h 09m2 stops
$405American Airlines
Find Deal
Tue, Dec 2 - Fri, Dec 5
Delta Logo
12:00 pm - 11:25 pmONT-MKE
9h 25m1 stop
Delta Logo
12:20 pm - 6:15 pmMKE-ONT
7h 55m1 stop
$437Delta
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Tue, Apr 14 - Wed, Apr 15
Delta Logo
12:00 pm - 11:25 pmONT-MKE
9h 25m1 stop
Delta Logo
5:55 pm - 11:44 pmMKE-ONT
7h 49m2 stops
$442Delta
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Tue, Apr 14 - Wed, Apr 15
Southwest Logo
3:40 pm - 11:15 pmONT-MKE
5h 35m1 stop
Southwest Logo
6:20 am - 12:50 pmMKE-ONT
8h 30m2 stops
$454Southwest
Find Deal
Tue, Dec 23 - Tue, Dec 30

Alaska Airlines flights from Ontario to Milwaukee

Our best Alaska Airlines deals on Ontario to Milwaukee flight tickets
Alaska Airlines
Dec 11
ONT7:33 pmOntario
17h 22m
1 stop
MKE2:55 pmMilwaukee-Mitchell
Dec 15
MKE3:51 pmMilwaukee-Mitchell
9h 38m
1 stop
ONT11:29 pmOntario
$350
Find similar
Alaska Airlines
Dec 6
ONT12:13 pmOntario
24h 42m
1 stop
MKE2:55 pmMilwaukee-Mitchell
Dec 9
MKE3:51 pmMilwaukee-Mitchell
21h 28m
1 stop
ONT11:19 amOntario
$392
Find similar
Alaska Airlines
Dec 5
ONT7:33 pmOntario
17h 22m
1 stop
MKE2:55 pmMilwaukee-Mitchell
Dec 12
MKE3:51 pmMilwaukee-Mitchell
21h 28m
1 stop
ONT11:19 amOntario
$402
Find similar

United Airlines flights from Ontario to Milwaukee

Our best United Airlines deals on Ontario to Milwaukee flight tickets
United Airlines
Dec 11
ONT5:05 amOntario
7h 14m
1 stop
MKE2:19 pmMilwaukee-Mitchell
Dec 15
MKE5:00 amMilwaukee-Mitchell
9h 17m
2 stops
ONT12:17 pmOntario
$356
Find similar
United Airlines
Dec 2
ONT1:34 pmOntario
5h 56m
1 stop
MKE9:30 pmMilwaukee-Mitchell
Dec 5
MKE4:05 pmMilwaukee-Mitchell
7h 44m
1 stop
ONT9:49 pmOntario
$395
Find similar
United Airlines
Dec 2
ONT5:05 amOntario
6h 19m
1 stop
MKE1:24 pmMilwaukee-Mitchell
Dec 5
MKE3:15 pmMilwaukee-Mitchell
9h 34m
2 stops
ONT10:49 pmOntario
$400
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 October 30, 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

Mon 11/10

6:53 am-7:19 pm

1 stop10h 26m

Milwaukee-Mitchell

Mon 11/17

8:04 pm-9:27 pm

1 stop27h 23m

$177

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Mon 11/10

6:53 am-7:19 pm

1 stop10h 26m

Milwaukee-Mitchell

Mon 11/17

8:04 pm-11:50 pm

1 stop5h 46m

$236

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Thu 12/11

5:05 am-2:19 pm

1 stop7h 14m

Milwaukee-Mitchell

Mon 12/15

5:00 am-12:17 pm

2 stops9h 17m

$356

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Thu 12/11

7:00 am-5:30 pm

2 stops8h 30m

Milwaukee-Mitchell

Mon 12/15

1:00 pm-8:55 pm

2 stops9h 55m

$361

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Thu 11/27

6:11 am-2:24 pm

1 stop6h 13m

Milwaukee-Mitchell

Mon 12/1

5:50 pm-9:59 pm

1 stop6h 09m

$393

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Tue 12/2

1:34 pm-9:30 pm

1 stop5h 56m

Milwaukee-Mitchell

Fri 12/5

4:05 pm-9:49 pm

1 stop7h 44m

$395

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Tue 12/2

9:59 am-9:31 pm

2 stops9h 32m

Milwaukee-Mitchell

Fri 12/5

8:53 am-4:02 pm

2 stops9h 09m

$405

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Tue 4/14

12:00 pm-11:25 pm

1 stop9h 25m

Milwaukee-Mitchell

Wed 4/15

12:20 pm-6:15 pm

1 stop7h 55m

$437

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Tue 4/14

12:00 pm-11:25 pm

1 stop9h 25m

Milwaukee-Mitchell

Wed 4/15

5:55 pm-11:44 pm

2 stops7h 49m

$442

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Tue 12/23

3:40 pm-11:15 pm

1 stop5h 35m

Milwaukee-Mitchell

Tue 12/30

6:20 am-12:50 pm

2 stops8h 30m

$454

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 January. Flight prices, which tend to average around $351, are often lower during this time because this is during the off-season. The month of September is another great option to travel to Milwaukee, with average flight prices from Ontario averaging around $366.

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 far in advance should I book a flight to Milwaukee?

You are more likely to see cheaper flights to Milwaukee from Ontario when booking weeks ahead of your departure date. In general, you can expect to find flights to Milwaukee for around $408 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Milwaukee from Ontario for as low as $305 on momondo.

How have Ontario to Milwaukee flight prices changed over time?

As of October 2025, prices for Ontario to Milwaukee flights are approximately 34% 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.
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  • 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 33m, 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
11,035 reviews
Search American Airlines flights
United AirlinesPriceFrom $309Free CancellationRating
7.4
8,998 reviews
Search United Airlines flights
SouthwestPriceFrom $330Free CancellationRating
8.0
4,243 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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