Latest deals
Insights
When to book
FAQs
Reviews
Price Alerts

Cheap flights from Ontario to Milwaukee from $131

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 8/25. 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
6:40 am - 2:30 pm
ONT
-
MKE
5h 50m
1 stop
Southwest Logo
6:30 am - 10:20 am
MKE
-
ONT
5h 50m
1 stop
$262Southwest
mar., sep. 15 - sáb., sep. 19
Southwest Logo
12:50 pm - 9:00 pm
ONT
-
MKE
6h 10m
1 stop
Southwest Logo
6:20 pm - 10:05 pm
MKE
-
ONT
5h 45m
1 stop
$263Southwest
jue., sep. 24 - lun., sep. 28
Southwest Logo
10:55 am - 9:25 pm
ONT
-
MKE
8h 30m
2 stops
Southwest Logo
6:30 am - 10:20 am
MKE
-
ONT
5h 50m
1 stop
$267Southwest
mar., sep. 15 - sáb., sep. 19
Southwest Logo
12:50 pm - 9:00 pm
ONT
-
MKE
6h 10m
1 stop
Southwest Logo
11:45 am - 7:25 pm
MKE
-
ONT
9h 40m
2 stops
$268Southwest
jue., sep. 24 - lun., sep. 28
American Airlines Logo
7:15 pm - 7:49 am
ONT
-
MKE
10h 34m
2 stops
American Airlines Logo
5:00 am - 12:03 pm
MKE
-
ONT
9h 03m
2 stops
$273American Airlines
mar., ago. 4 - mar., ago. 11
Delta Logo
1:17 pm - 9:46 pm
ONT
-
MKE
6h 29m
1 stop
Delta Logo
4:29 pm - 10:01 pm
MKE
-
ONT
7h 32m
1 stop
$277Delta
jue., oct. 29 - lun., nov. 2
Southwest Logo
1:05 pm - 10:30 pm
ONT
-
MKE
7h 25m
2 stops
Southwest Logo
5:40 am - 12:15 pm
MKE
-
ONT
8h 35m
2 stops
$295Southwest
jue., oct. 29 - mar., nov. 3
Southwest Logo
8:10 am - 5:45 pm
ONT
-
MKE
7h 35m
1 stop
Southwest Logo
5:00 pm - 8:55 pm
MKE
-
ONT
5h 55m
1 stop
$296Southwest
vie., ago. 21 - mar., ago. 25
Southwest Logo
12:40 pm - 10:45 pm
ONT
-
MKE
8h 05m
1 stop
Southwest Logo
5:30 am - 9:55 am
MKE
-
ONT
6h 25m
1 stop
$297Southwest
vie., oct. 16 - lun., oct. 19
Southwest Logo
12:40 pm - 10:45 pm
ONT
-
MKE
8h 05m
1 stop
Southwest Logo
5:00 pm - 11:55 pm
MKE
-
ONT
8h 55m
2 stops
$302Southwest
vie., oct. 16 - lun., oct. 19

Save money when you book flights with momondo

Big names and deals

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize your results.

Trusted and free

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Price Alerts

Not ready to book? to track prices.
Search flight deals

Delta flights from Ontario to Milwaukee

Our best Delta deals on Ontario to Milwaukee flight tickets
Delta
Oct 29
ONT1:17 pmOntario
6h 29m
1 stop
MKE9:46 pmMilwaukee-Mitchell
Nov 2
MKE4:29 pmMilwaukee-Mitchell
7h 32m
1 stop
ONT10:01 pmOntario
$277
Delta
Aug 4
ONT1:06 pmOntario
6h 35m
1 stop
MKE9:41 pmMilwaukee-Mitchell
Aug 11
MKE7:30 amMilwaukee-Mitchell
6h 46m
1 stop
ONT12:16 pmOntario
$304
Delta
Aug 8
ONT12:00 pmOntario
9h 53m
1 stop
MKE11:53 pmMilwaukee-Mitchell
Aug 15
MKE7:30 amMilwaukee-Mitchell
6h 46m
1 stop
ONT12:16 pmOntario
$323

Alaska Airlines flights from Ontario to Milwaukee

Our best Alaska Airlines deals on Ontario to Milwaukee flight tickets
Alaska Airlines
Nov 13
ONT12:00 pmOntario
25h 48m
1 stop
MKE3:48 pmMilwaukee-Mitchell
Nov 16
MKE4:44 pmMilwaukee-Mitchell
8h 10m
1 stop
ONT10:54 pmOntario
$418
Alaska Airlines
Nov 4
ONT4:09 pmOntario
21h 39m
1 stop
MKE3:48 pmMilwaukee-Mitchell
Nov 20
MKE7:00 amMilwaukee-Mitchell
9h 47m
1 stop
ONT2:47 pmOntario
$420
Alaska Airlines
Dec 9
ONT6:00 amOntario
11h 58m
2 stops
MKE7:58 pmMilwaukee-Mitchell
Dec 12
MKE5:00 amMilwaukee-Mitchell
11h 47m
2 stops
ONT2:47 pmOntario
$433

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 julio 13, 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
Quickest round-trip

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

mar. 9/15

6:40 am-2:30 pm

1 stop5h 50m

Milwaukee-Mitchell

sáb. 9/19

6:30 am-10:20 am

1 stop5h 50m

$262

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

jue. 9/24

12:50 pm-9:00 pm

1 stop6h 10m

Milwaukee-Mitchell

lun. 9/28

6:20 pm-10:05 pm

1 stop5h 45m

$263

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

mar. 9/15

10:55 am-9:25 pm

2 stops8h 30m

Milwaukee-Mitchell

sáb. 9/19

6:30 am-10:20 am

1 stop5h 50m

$267

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

jue. 9/24

12:50 pm-9:00 pm

1 stop6h 10m

Milwaukee-Mitchell

lun. 9/28

11:45 am-7:25 pm

2 stops9h 40m

$268

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

mar. 8/4

7:15 pm-7:49 am

2 stops10h 34m

Milwaukee-Mitchell

mar. 8/11

5:00 am-12:03 pm

2 stops9h 03m

$273

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

jue. 10/29

1:17 pm-9:46 pm

1 stop6h 29m

Milwaukee-Mitchell

lun. 11/2

4:29 pm-10:01 pm

1 stop7h 32m

$277

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

jue. 10/29

1:05 pm-10:30 pm

2 stops7h 25m

Milwaukee-Mitchell

mar. 11/3

5:40 am-12:15 pm

2 stops8h 35m

$295

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

vie. 8/21

8:10 am-5:45 pm

1 stop7h 35m

Milwaukee-Mitchell

mar. 8/25

5:00 pm-8:55 pm

1 stop5h 55m

$296

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

vie. 10/16

12:40 pm-10:45 pm

1 stop8h 05m

Milwaukee-Mitchell

lun. 10/19

5:30 am-9:55 am

1 stop6h 25m

$297

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

vie. 10/16

12:40 pm-10:45 pm

1 stop8h 05m

Milwaukee-Mitchell

lun. 10/19

5:00 pm-11:55 pm

2 stops8h 55m

$302

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
1
2

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 55m

Direct flights

None
The fastest flight from Ontario to Milwaukee takes 5h 55m
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 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
American AirlinesPriceFrom $220Free CancellationRating
7.1
11,810 reviews
Search American Airlines flights
United AirlinesPriceFrom $309Free CancellationRating
7.4
9,983 reviews
Search United Airlines flights
SouthwestPriceFrom $350Free CancellationRating
8.0
4,249 reviews
Search Southwest flights

  • Southwest Flights From Ontario to Milwaukee

    Southwest operates around 1 flight from Ontario to Milwaukee every week. The average price of these flights found in the last 72 hours has been $493, but momondo users have found Southwest deals from Ontario to Milwaukee from as low as $350 round-trip. Southwest has been scored 8.0/10 in 4,249 reviews.

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
Pewaukee
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.

An easier way to manage your Milwaukee trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.
Start using Trips
Find my bookings

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.
1 adult
mié. 8/12
mié. 8/19
By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to the United States