Latest deals
Insights
When to book
FAQs
Reviews
Price Alerts

Cheap flights from Ontario to Milwaukee from $189

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.
Delta Logo
12:17 pm - 9:30 pmONT  Ontario-MKE Milwaukee-Mitchell
7h 13m1 stop Atlanta Hartsfield-Jackson
Delta Logo
7:05 am - 12:36 pmMKE  Milwaukee-Mitchell-ONT Ontario
7h 31m1 stop Salt Lake City
$377Delta
Tue, Sep 22 - Tue, Oct 13
Delta Logo
12:17 pm - 9:30 pmONT  Ontario-MKE Milwaukee-Mitchell
7h 13m1 stop Atlanta Hartsfield-Jackson
Delta Logo
12:44 pm - 6:07 pmMKE  Milwaukee-Mitchell-ONT Ontario
7h 23m1 stop Atlanta Hartsfield-Jackson
$377Delta
Wed, Sep 16 - Mon, Sep 21
Southwest Logo
9:40 am - 8:10 pmONT  Ontario-MKE Milwaukee-Mitchell
8h 30m1 stop Las Vegas Harry Reid Intl
Southwest Logo
5:20 pm - 9:00 pmMKE  Milwaukee-Mitchell-ONT Ontario
5h 40m1 stop Phoenix Sky Harbor Intl
$377Southwest
Wed, Sep 16 - Tue, Sep 22
Southwest Logo
4:40 pm - 12:05 amONT  Ontario-MKE Milwaukee-Mitchell
5h 25m1 stop Phoenix Sky Harbor Intl
Southwest Logo
5:45 am - 10:20 amMKE  Milwaukee-Mitchell-ONT Ontario
6h 35m1 stop Las Vegas Harry Reid Intl
$377Southwest
Sat, Oct 17 - Mon, Oct 19
American Airlines Logo
6:15 am - 1:54 pmONT  Ontario-MKE Milwaukee-Mitchell
5h 39m1 stop Phoenix Sky Harbor Intl
American Airlines Logo
7:01 am - 1:25 pmMKE  Milwaukee-Mitchell-ONT Ontario
8h 24m1 stop Dallas/Fort Worth
$377American Airlines
Tue, Sep 8 - Sat, Sep 26
American Airlines Logo
6:12 am - 4:24 pmONT  Ontario-MKE Milwaukee-Mitchell
8h 12m1 stop Chicago O'Hare Intl
American Airlines Logo
1:07 pm - 6:50 pmMKE  Milwaukee-Mitchell-ONT Ontario
7h 43m1 stop Dallas/Fort Worth
$377American Airlines
Thu, Dec 31 - Tue, Jan 5
American Airlines Logo
12:37 pm - 9:48 pmONT  Ontario-MKE Milwaukee-Mitchell
7h 11m1 stop Dallas/Fort Worth
American Airlines Logo
7:01 am - 1:25 pmMKE  Milwaukee-Mitchell-ONT Ontario
8h 24m1 stop Dallas/Fort Worth
$377American Airlines
Wed, Sep 16 - Sat, Sep 19
United Airlines Logo
5:00 am - 4:46 pmONT  Ontario-MKE Milwaukee-Mitchell
9h 46m2 stops Denver Intl Chicago O'Hare Intl
United Airlines Logo
8:30 am - 12:33 pmMKE  Milwaukee-Mitchell-ONT Ontario
6h 03m1 stop Denver Intl
$382United Airlines
Thu, Dec 31 - Tue, Jan 5
United Airlines Logo
5:00 am - 1:34 pmONT  Ontario-MKE Milwaukee-Mitchell
6h 34m1 stop Denver Intl
United Airlines Logo
10:35 am - 8:01 pmMKE  Milwaukee-Mitchell-ONT Ontario
11h 26m2 stops Denver Intl San Francisco
$382United Airlines
Wed, Sep 16 - Sat, Sep 19
Delta Logo
1:04 pm - 9:11 pmONT  Ontario-MKE Milwaukee-Mitchell
6h 07m1 stop Salt Lake City
Delta Logo
4:49 pm - 10:24 pmMKE  Milwaukee-Mitchell-ONT Ontario
7h 35m1 stop Atlanta Hartsfield-Jackson
$428Delta
Wed, Sep 16 - Mon, Sep 21

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
Sep 16
ONT12:17 pmOntario
7h 13m
1 stop
MKE9:30 pmMilwaukee-Mitchell
Sep 21
MKE12:44 pmMilwaukee-Mitchell
7h 23m
1 stop
ONT6:07 pmOntario
$377
Delta
Sep 10
ONT1:04 pmOntario
6h 07m
1 stop
MKE9:11 pmMilwaukee-Mitchell
Sep 14
MKE4:49 pmMilwaukee-Mitchell
7h 35m
1 stop
ONT10:24 pmOntario
$428
Delta
Oct 3
ONT12:17 pmOntario
9h 31m
1 stop
MKE11:48 pmMilwaukee-Mitchell
Oct 11
MKE5:30 amMilwaukee-Mitchell
7h 36m
1 stop
ONT11:06 amOntario
$435

United Airlines flights from Ontario to Milwaukee

Our best United Airlines deals on Ontario to Milwaukee flight tickets
United Airlines
Sep 16
ONT5:00 amOntario
6h 34m
1 stop
MKE1:34 pmMilwaukee-Mitchell
Sep 19
MKE10:35 amMilwaukee-Mitchell
11h 26m
2 stops
ONT8:01 pmOntario
$382
United Airlines
Nov 1
ONT5:00 amOntario
6h 34m
1 stop
MKE1:34 pmMilwaukee-Mitchell
Nov 14
MKE12:03 pmMilwaukee-Mitchell
10h 48m
2 stops
ONT8:51 pmOntario
$437
United Airlines
Sep 16
ONT5:00 amOntario
8h 11m
2 stops
MKE3:11 pmMilwaukee-Mitchell
Sep 22
MKE5:00 amMilwaukee-Mitchell
9h 50m
2 stops
ONT12:50 pmOntario
$441

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

OntarioMilwaukee

ONT Ontario - MKE Milwaukee-Mitchell

ONTMKE

Ontario

Tue 9/22

12:17 pm-9:30 pm

1 stop7h 13m

Milwaukee-Mitchell

Tue 10/13

7:05 am-12:36 pm

1 stop7h 31m

$377

OntarioMilwaukee

ONT Ontario - MKE Milwaukee-Mitchell

ONTMKE

Ontario

Wed 9/16

12:17 pm-9:30 pm

1 stop7h 13m

Milwaukee-Mitchell

Mon 9/21

12:44 pm-6:07 pm

1 stop7h 23m

$377

OntarioMilwaukee

ONT Ontario - MKE Milwaukee-Mitchell

ONTMKE

Ontario

Wed 9/16

9:40 am-8:10 pm

1 stop8h 30m

Milwaukee-Mitchell

Tue 9/22

5:20 pm-9:00 pm

1 stop5h 40m

$377
Quickest round-trip

OntarioMilwaukee

ONT Ontario - MKE Milwaukee-Mitchell

ONTMKE

Ontario

Sat 10/17

4:40 pm-12:05 am

1 stop5h 25m

Milwaukee-Mitchell

Mon 10/19

5:45 am-10:20 am

1 stop6h 35m

$377

OntarioMilwaukee

ONT Ontario - MKE Milwaukee-Mitchell

ONTMKE

Ontario

Tue 9/8

6:15 am-1:54 pm

1 stop5h 39m

Milwaukee-Mitchell

Sat 9/26

7:01 am-1:25 pm

1 stop8h 24m

$377

OntarioMilwaukee

ONT Ontario - MKE Milwaukee-Mitchell

ONTMKE

Ontario

Thu 12/31

6:12 am-4:24 pm

1 stop8h 12m

Milwaukee-Mitchell

Tue 1/5

1:07 pm-6:50 pm

1 stop7h 43m

$377

OntarioMilwaukee

ONT Ontario - MKE Milwaukee-Mitchell

ONTMKE

Ontario

Wed 9/16

12:37 pm-9:48 pm

1 stop7h 11m

Milwaukee-Mitchell

Sat 9/19

7:01 am-1:25 pm

1 stop8h 24m

$377

OntarioMilwaukee

ONT Ontario - MKE Milwaukee-Mitchell

ONTMKE

Ontario

Thu 12/31

5:00 am-4:46 pm

2 stops9h 46m

Milwaukee-Mitchell

Tue 1/5

8:30 am-12:33 pm

1 stop6h 03m

$382

OntarioMilwaukee

ONT Ontario - MKE Milwaukee-Mitchell

ONTMKE

Ontario

Wed 9/16

5:00 am-1:34 pm

1 stop6h 34m

Milwaukee-Mitchell

Sat 9/19

10:35 am-8:01 pm

2 stops11h 26m

$382

OntarioMilwaukee

ONT Ontario - MKE Milwaukee-Mitchell

ONTMKE

Ontario

Wed 9/16

1:04 pm-9:11 pm

1 stop6h 07m

Milwaukee-Mitchell

Mon 9/21

4:49 pm-10:24 pm

1 stop7h 35m

$428

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 typical price of a round-trip flight between Ontario and Milwaukee?

Prices are currently typical for flights on this route.

Typical prices usually range from $347 to $530.
The lowest price recently found on this route was $377.

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 November is another great option to travel to Milwaukee, with average flight prices from Ontario averaging around $378.

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 August 2026, prices for Ontario to Milwaukee flights are approximately 2% 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

$189

Fastest flight time

5h 25m

Direct flights

None
The best one-way flight to Milwaukee from Ontario in the past 72 hours is $189. The best round-trip flight deal from Ontario to Milwaukee found on momondo in the last 72 hours is $377.
The fastest flight from Ontario to Milwaukee takes 5h 25m
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 25m, 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
11,974 reviews
Search American Airlines flights
United AirlinesPriceFrom $309Free CancellationRating
7.4
10,102 reviews
Search United Airlines flights
SouthwestPriceFrom $337Free CancellationRating
8.0
4,215 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
Kohler
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 9/19
Sat 9/26
By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to the United States