Latest deals
Insights
When to book
FAQs
Reviews
Price Alerts

Cheap flights from Ontario to Milwaukee from $179

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
6:50 am - 2:05 pmONT  Ontario-MKE Milwaukee-Mitchell
5h 15m1 stop Denver Intl
Southwest Logo
4:45 pm - 8:40 pmMKE  Milwaukee-Mitchell-ONT Ontario
5h 55m1 stop Las Vegas Harry Reid Intl
$357Southwest
Tue, Dec 8 - Tue, Dec 8
Delta Logo
12:18 pm - 10:28 pmONT  Ontario-MKE Milwaukee-Mitchell
8h 10m1 stop Atlanta Hartsfield-Jackson
Delta Logo
3:12 pm - 8:58 pmMKE  Milwaukee-Mitchell-ONT Ontario
7h 46m1 stop Atlanta Hartsfield-Jackson
$357Delta
Thu, Nov 26 - Wed, Dec 2
Delta Logo
7:05 am - 5:38 pmONT  Ontario-MKE Milwaukee-Mitchell
8h 33m1 stop Atlanta Hartsfield-Jackson
Delta Logo
5:20 am - 11:07 amMKE  Milwaukee-Mitchell-ONT Ontario
7h 47m1 stop Atlanta Hartsfield-Jackson
$357Delta
Tue, Dec 8 - Fri, Dec 11
Delta Logo
1:11 pm - 9:52 pmONT  Ontario-MKE Milwaukee-Mitchell
6h 41m1 stop Salt Lake City
Delta Logo
3:18 pm - 9:55 pmMKE  Milwaukee-Mitchell-ONT Ontario
8h 37m1 stop Atlanta Hartsfield-Jackson
$357Delta
Tue, Dec 1 - Thu, Dec 3
Southwest Logo
5:55 am - 4:10 pmONT  Ontario-MKE Milwaukee-Mitchell
8h 15m2 stops Phoenix Sky Harbor Intl Denver Intl
Southwest Logo
5:55 pm - 9:45 pmMKE  Milwaukee-Mitchell-ONT Ontario
5h 50m1 stop Denver Intl
$362Southwest
Tue, Dec 8 - Tue, Dec 8
Southwest Logo
1:30 pm - 11:15 pmONT  Ontario-MKE Milwaukee-Mitchell
7h 45m2 stops Las Vegas Harry Reid Intl Phoenix Sky Harbor Intl
Southwest Logo
1:55 pm - 9:45 pmMKE  Milwaukee-Mitchell-ONT Ontario
9h 50m2 stops Las Vegas Harry Reid Intl Oakland
$367Southwest
Tue, Dec 8 - Fri, Dec 11
American Airlines Logo
12:51 pm - 9:36 pmONT  Ontario-MKE Milwaukee-Mitchell
6h 45m1 stop Dallas/Fort Worth
American Airlines Logo
6:50 am - 11:59 amMKE  Milwaukee-Mitchell-ONT Ontario
7h 09m1 stop Dallas/Fort Worth
$371American Airlines
Thu, Dec 24 - Fri, Jan 1
American Airlines Logo
9:35 am - 9:36 pmONT  Ontario-MKE Milwaukee-Mitchell
10h 01m2 stops Phoenix Sky Harbor Intl Dallas/Fort Worth
American Airlines Logo
6:50 am - 11:59 amMKE  Milwaukee-Mitchell-ONT Ontario
7h 09m1 stop Dallas/Fort Worth
$376American Airlines
Thu, Dec 24 - Fri, Jan 1
Southwest Logo
5:55 am - 4:10 pmONT  Ontario-MKE Milwaukee-Mitchell
8h 15m2 stops Phoenix Sky Harbor Intl Denver Intl
Southwest Logo
5:45 am - 12:10 pmMKE  Milwaukee-Mitchell-ONT Ontario
8h 25m2 stops Denver Intl Phoenix Sky Harbor Intl
$381Southwest
Tue, Dec 8 - Thu, Dec 10
American Airlines Logo
6:00 am - 5:09 pmONT  Ontario-MKE Milwaukee-Mitchell
9h 09m1 stop Dallas/Fort Worth
American Airlines Logo
7:06 am - 1:24 pmMKE  Milwaukee-Mitchell-ONT Ontario
8h 18m1 stop Dallas/Fort Worth
$397American Airlines
Tue, Dec 8 - Sun, Dec 13

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

Alaska Airlines flights from Ontario to Milwaukee

Our best Alaska Airlines deals on Ontario to Milwaukee flight tickets
Alaska Airlines
Dec 29
ONT6:00 amOntario
7h 29m
1 stop
MKE3:29 pmMilwaukee-Mitchell
Jan 7
MKE3:17 pmMilwaukee-Mitchell
9h 26m
1 stop
ONT10:43 pmOntario
$395
Alaska Airlines
Jan 1
ONT6:00 amOntario
7h 33m
1 stop
MKE3:33 pmMilwaukee-Mitchell
Jan 6
MKE3:25 pmMilwaukee-Mitchell
9h 16m
1 stop
ONT10:41 pmOntario
$435
Alaska Airlines
Dec 17
ONT6:00 amOntario
7h 29m
1 stop
MKE3:29 pmMilwaukee-Mitchell
Jan 1
MKE6:00 amMilwaukee-Mitchell
11h 03m
1 stop
ONT3:03 pmOntario
$437

United Airlines flights from Ontario to Milwaukee

Our best United Airlines deals on Ontario to Milwaukee flight tickets
United Airlines
Dec 8
ONT5:45 amOntario
9h 33m
2 stops
MKE5:18 pmMilwaukee-Mitchell
Dec 10
MKE3:59 pmMilwaukee-Mitchell
7h 12m
1 stop
ONT9:11 pmOntario
$362
United Airlines
Dec 2
ONT5:00 amOntario
6h 24m
1 stop
MKE1:24 pmMilwaukee-Mitchell
Dec 5
MKE2:05 pmMilwaukee-Mitchell
9h 54m
1 stop
ONT9:59 pmOntario
$477
United Airlines
Dec 2
ONT1:40 pmOntario
5h 30m
1 stop
MKE9:10 pmMilwaukee-Mitchell
Dec 5
MKE10:38 amMilwaukee-Mitchell
12h 33m
2 stops
ONT9:11 pmOntario
$482

momondo Fare Finder

 
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 Ontario - MKE Milwaukee-Mitchell

ONTMKE

Ontario

Tue 12/8

6:50 am-2:05 pm

1 stop5h 15m

Milwaukee-Mitchell

Tue 12/8

4:45 pm-8:40 pm

1 stop5h 55m

$357

OntarioMilwaukee

ONT Ontario - MKE Milwaukee-Mitchell

ONTMKE

Ontario

Thu 11/26

12:18 pm-10:28 pm

1 stop8h 10m

Milwaukee-Mitchell

Wed 12/2

3:12 pm-8:58 pm

1 stop7h 46m

$357

OntarioMilwaukee

ONT Ontario - MKE Milwaukee-Mitchell

ONTMKE

Ontario

Tue 12/8

7:05 am-5:38 pm

1 stop8h 33m

Milwaukee-Mitchell

Fri 12/11

5:20 am-11:07 am

1 stop7h 47m

$357

OntarioMilwaukee

ONT Ontario - MKE Milwaukee-Mitchell

ONTMKE

Ontario

Tue 12/1

1:11 pm-9:52 pm

1 stop6h 41m

Milwaukee-Mitchell

Thu 12/3

3:18 pm-9:55 pm

1 stop8h 37m

$357

OntarioMilwaukee

ONT Ontario - MKE Milwaukee-Mitchell

ONTMKE

Ontario

Tue 12/8

5:55 am-4:10 pm

2 stops8h 15m

Milwaukee-Mitchell

Tue 12/8

5:55 pm-9:45 pm

1 stop5h 50m

$362

OntarioMilwaukee

ONT Ontario - MKE Milwaukee-Mitchell

ONTMKE

Ontario

Tue 12/8

1:30 pm-11:15 pm

2 stops7h 45m

Milwaukee-Mitchell

Fri 12/11

1:55 pm-9:45 pm

2 stops9h 50m

$367

OntarioMilwaukee

ONT Ontario - MKE Milwaukee-Mitchell

ONTMKE

Ontario

Thu 12/24

12:51 pm-9:36 pm

1 stop6h 45m

Milwaukee-Mitchell

Fri 1/1

6:50 am-11:59 am

1 stop7h 09m

$371

OntarioMilwaukee

ONT Ontario - MKE Milwaukee-Mitchell

ONTMKE

Ontario

Thu 12/24

9:35 am-9:36 pm

2 stops10h 01m

Milwaukee-Mitchell

Fri 1/1

6:50 am-11:59 am

1 stop7h 09m

$376

OntarioMilwaukee

ONT Ontario - MKE Milwaukee-Mitchell

ONTMKE

Ontario

Tue 12/8

5:55 am-4:10 pm

2 stops8h 15m

Milwaukee-Mitchell

Thu 12/10

5:45 am-12:10 pm

2 stops8h 25m

$381

OntarioMilwaukee

ONT Ontario - MKE Milwaukee-Mitchell

ONTMKE

Ontario

Tue 12/8

6:00 am-5:09 pm

1 stop9h 09m

Milwaukee-Mitchell

Sun 12/13

7:06 am-1:24 pm

1 stop8h 18m

$397

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 February. Flight prices, which tend to average around $426, are often lower during this time because this is during the off-season. The month of August is another great option to travel to Milwaukee, with average flight prices from Ontario averaging around $429.

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 November 2026, prices for Ontario to Milwaukee flights are approximately 6% cheaper 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

Best Price Found

$179

Fastest flight time

6h 13m

Direct flights

None
The best one-way flight to Milwaukee from Ontario in the past 72 hours is $179. The best round-trip flight deal from Ontario to Milwaukee found on momondo in the last 72 hours is $357.
The fastest flight from Ontario to Milwaukee takes 6h 13m
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 6h 13m, 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
SouthwestPriceFrom $356Free CancellationRating
8.0
4,214 reviews
Search Southwest flights
American AirlinesPriceFrom $366Free CancellationRating
7.0
12,228 reviews
Search American Airlines flights

Traveling to a place near Milwaukee?

Book flights to Milwaukee if you plan to visit one of these locations
Sheboygan
Waukesha
Oak Creek
Wauwatosa
Mequon
Glendale
West Bend
Kohler
Port Washington
Pewaukee
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
Sat 12/5
Sat 12/12
By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to the United States