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Cheap flights from Ontario to Milwaukee from $162

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 9/30. 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

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from Ontario to Milwaukee

Cheap round-trip flights

Enter your travel dates to find the best prices.
Southwest Logo
10:15 am - 7:45 pm
ONT
-
MKE
7h 30m
1 stop
Southwest Logo
5:00 pm - 8:50 pm
MKE
-
ONT
5h 50m
1 stop
$323Southwest
Sat, Sep 5 - Sat, Sep 12
Southwest Logo
3:25 pm - 11:15 pm
ONT
-
MKE
5h 50m
1 stop
Southwest Logo
5:30 pm - 10:05 pm
MKE
-
ONT
6h 35m
1 stop
$328Southwest
Sun, Sep 6 - Wed, Sep 9
Southwest Logo
12:05 pm - 9:20 pm
ONT
-
MKE
7h 15m
2 stops
Southwest Logo
5:20 pm - 9:00 pm
MKE
-
ONT
5h 40m
1 stop
$333Southwest
Sun, Sep 6 - Wed, Sep 9
Southwest Logo
12:05 pm - 9:20 pm
ONT
-
MKE
7h 15m
2 stops
Southwest Logo
6:40 am - 12:40 pm
MKE
-
ONT
8h 00m
2 stops
$338Southwest
Sun, Sep 6 - Wed, Sep 9
American Airlines Logo
8:01 pm - 10:57 am
ONT
-
MKE
12h 56m
2 stops
American Airlines Logo
7:01 am - 6:17 pm
MKE
-
ONT
13h 16m
2 stops
$339American Airlines
Sun, Sep 6 - Sat, Sep 12
American Airlines Logo
2:27 pm - 10:57 pm
ONT
-
MKE
6h 30m
1 stop
American Airlines Logo
7:01 am - 1:25 pm
MKE
-
ONT
8h 24m
1 stop
$341American Airlines
Sun, Sep 6 - Sat, Sep 12
American Airlines Logo
10:00 am - 7:59 pm
ONT
-
MKE
7h 59m
2 stops
American Airlines Logo
7:01 am - 1:25 pm
MKE
-
ONT
8h 24m
1 stop
$346American Airlines
Sun, Sep 6 - Sat, Sep 12
American Airlines Logo
10:00 am - 7:59 pm
ONT
-
MKE
7h 59m
2 stops
American Airlines Logo
8:31 am - 6:17 pm
MKE
-
ONT
11h 46m
2 stops
$351American Airlines
Sun, Sep 6 - Sat, Sep 12
Alaska Airlines Logo
6:02 am - 11:59 pm
ONT
-
MKE
15h 57m
1 stop
Alaska Airlines Logo
6:02 am - 1:09 pm
MKE
-
ONT
9h 07m
1 stop
$359Alaska Airlines
Thu, Aug 13 - Mon, Aug 17
American Airlines Logo
6:15 am - 9:00 pm
ONT
-
MKE
12h 45m
2 stops
American Airlines Logo
11:37 am - 6:17 pm
MKE
-
ONT
8h 40m
2 stops
$361American Airlines
Sat, Sep 5 - Fri, Sep 11

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Delta flights from Ontario to Milwaukee

Our best Delta deals on Ontario to Milwaukee flight tickets
Delta
Oct 31
ONT1:17 pmOntario
6h 29m
1 stop
MKE9:46 pmMilwaukee-Mitchell
Nov 7
MKE12:35 pmMilwaukee-Mitchell
8h 57m
1 stop
ONT7:32 pmOntario
$323
Delta
Sep 5
ONT1:06 pmOntario
6h 35m
1 stop
MKE9:41 pmMilwaukee-Mitchell
Sep 10
MKE7:30 amMilwaukee-Mitchell
6h 44m
1 stop
ONT12:14 pmOntario
$381
Delta
Aug 18
ONT12:00 pmOntario
9h 53m
1 stop
MKE11:53 pmMilwaukee-Mitchell
Aug 22
MKE12:47 pmMilwaukee-Mitchell
7h 43m
1 stop
ONT6:30 pmOntario
$386

United Airlines flights from Ontario to Milwaukee

Our best United Airlines deals on Ontario to Milwaukee flight tickets
United Airlines
Sep 6
ONT7:00 amOntario
7h 10m
1 stop
MKE4:10 pmMilwaukee-Mitchell
Sep 12
MKE10:30 amMilwaukee-Mitchell
11h 31m
2 stops
ONT8:01 pmOntario
$328
United Airlines
Sep 5
ONT11:00 amOntario
9h 36m
2 stops
MKE10:36 pmMilwaukee-Mitchell
Sep 12
MKE2:20 pmMilwaukee-Mitchell
8h 33m
2 stops
ONT8:53 pmOntario
$370
United Airlines
Aug 13
ONT5:00 amOntario
9h 10m
2 stops
MKE4:10 pmMilwaukee-Mitchell
Aug 17
MKE5:17 pmMilwaukee-Mitchell
7h 18m
1 stop
ONT10:35 pmOntario
$404

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 July 24, 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

Sat 9/5

10:15 am-7:45 pm

1 stop7h 30m

Milwaukee-Mitchell

Sat 9/12

5:00 pm-8:50 pm

1 stop5h 50m

$323
Quickest round-trip

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Sun 9/6

3:25 pm-11:15 pm

1 stop5h 50m

Milwaukee-Mitchell

Wed 9/9

5:30 pm-10:05 pm

1 stop6h 35m

$328

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Sun 9/6

12:05 pm-9:20 pm

2 stops7h 15m

Milwaukee-Mitchell

Wed 9/9

5:20 pm-9:00 pm

1 stop5h 40m

$333

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Sun 9/6

12:05 pm-9:20 pm

2 stops7h 15m

Milwaukee-Mitchell

Wed 9/9

6:40 am-12:40 pm

2 stops8h 00m

$338

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Sun 9/6

8:01 pm-10:57 am

2 stops12h 56m

Milwaukee-Mitchell

Sat 9/12

7:01 am-6:17 pm

2 stops13h 16m

$339

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Sun 9/6

2:27 pm-10:57 pm

1 stop6h 30m

Milwaukee-Mitchell

Sat 9/12

7:01 am-1:25 pm

1 stop8h 24m

$341

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Sun 9/6

10:00 am-7:59 pm

2 stops7h 59m

Milwaukee-Mitchell

Sat 9/12

7:01 am-1:25 pm

1 stop8h 24m

$346

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Sun 9/6

10:00 am-7:59 pm

2 stops7h 59m

Milwaukee-Mitchell

Sat 9/12

8:31 am-6:17 pm

2 stops11h 46m

$351

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Thu 8/13

6:02 am-11:59 pm

1 stop15h 57m

Milwaukee-Mitchell

Mon 8/17

6:02 am-1:09 pm

1 stop9h 07m

$359

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Sat 9/5

6:15 am-9:00 pm

2 stops12h 45m

Milwaukee-Mitchell

Fri 9/11

11:37 am-6:17 pm

2 stops8h 40m

$361

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 December is another great option to travel to Milwaukee, with average flight prices from Ontario averaging around $396.

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 $181. 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 July 2026, prices for Ontario to Milwaukee flights are approximately 87% 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 10m

Direct flights

None
The fastest flight from Ontario to Milwaukee takes 5h 10m
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 10m, 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
American AirlinesPriceFrom $276Free CancellationRating
7.1
11,843 reviews
Search American Airlines flights
United AirlinesPriceFrom $309Free CancellationRating
7.4
10,028 reviews
Search United Airlines flights
SouthwestPriceFrom $350Free CancellationRating
8.0
4,236 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
West Bend
Port Washington
Pewaukee
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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