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Cheap flights from Ontario to Milwaukee from $146

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.
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 30 - Sat, Oct 3
Southwest Logo
3:20 pm - 10:40 pmONT  Ontario-MKE Milwaukee-Mitchell
5h 20m1 stop Las Vegas Harry Reid Intl
Southwest Logo
2:50 pm - 8:35 pmMKE  Milwaukee-Mitchell-ONT Ontario
7h 45m1 stop Las Vegas Harry Reid Intl
$377Southwest
Thu, Dec 3 - Mon, Dec 7
United Airlines Logo
6:00 am - 5:13 pmONT  Ontario-MKE Milwaukee-Mitchell
9h 13m1 stop Houston George Bush Intcntl
United Airlines Logo
2:39 pm - 8:58 pmMKE  Milwaukee-Mitchell-ONT Ontario
8h 19m1 stop Denver Intl
$377United Airlines
Sat, Oct 10 - Wed, Oct 14
United Airlines Logo
1:22 pm - 10:59 pmONT  Ontario-MKE Milwaukee-Mitchell
7h 37m2 stops Denver Intl Chicago O'Hare Intl
United Airlines Logo
2:39 pm - 8:58 pmMKE  Milwaukee-Mitchell-ONT Ontario
8h 19m1 stop Denver Intl
$382United Airlines
Sat, Oct 10 - Wed, Oct 14
Southwest Logo
5:55 am - 4:10 pmONT  Ontario-MKE Milwaukee-Mitchell
8h 15m2 stops Phoenix Sky Harbor Intl Denver Intl
Southwest Logo
2:50 pm - 8:35 pmMKE  Milwaukee-Mitchell-ONT Ontario
7h 45m1 stop Las Vegas Harry Reid Intl
$382Southwest
Thu, Dec 3 - Mon, Dec 7
American Airlines Logo
6:15 am - 8:03 pmONT  Ontario-MKE Milwaukee-Mitchell
11h 48m2 stops Phoenix Sky Harbor Intl Chicago O'Hare Intl
American Airlines Logo
5:43 pm - 10:37 pmMKE  Milwaukee-Mitchell-ONT Ontario
6h 54m1 stop Dallas/Fort Worth
$382American Airlines
Wed, Sep 30 - Sat, Oct 3
Delta Logo
11:08 pm - 12:32 pmONT  Ontario-MKE Milwaukee-Mitchell
11h 24m2 stops Atlanta Hartsfield-Jackson Detroit Metropolitan Wayne County
Delta Logo
3:19 pm - 11:58 pmMKE  Milwaukee-Mitchell-ONT Ontario
10h 39m2 stops Atlanta Hartsfield-Jackson Salt Lake City
$387Delta
Thu, Dec 3 - Mon, Dec 7
American Airlines Logo
6:15 am - 6:21 pmONT  Ontario-MKE Milwaukee-Mitchell
10h 06m2 stops Phoenix Sky Harbor Intl Chicago O'Hare Intl
American Airlines Logo
8:31 am - 6:17 pmMKE  Milwaukee-Mitchell-ONT Ontario
11h 46m2 stops Chicago O'Hare Intl Phoenix Sky Harbor Intl
$387American Airlines
Wed, Sep 30 - Sat, Oct 3
Southwest Logo
5:00 pm - 12:15 amONT  Ontario-MKE Milwaukee-Mitchell
5h 15m1 stop Phoenix Sky Harbor Intl
Southwest Logo
12:55 pm - 4:50 pmMKE  Milwaukee-Mitchell-ONT Ontario
5h 55m1 stop Denver Intl
$390Southwest
Wed, Nov 25 - Thu, Nov 26
Delta Logo
12:16 pm - 9:23 pmONT  Ontario-MKE Milwaukee-Mitchell
7h 07m1 stop Atlanta Hartsfield-Jackson
Delta Logo
5:30 am - 11:06 amMKE  Milwaukee-Mitchell-ONT Ontario
7h 36m1 stop Atlanta Hartsfield-Jackson
$394Delta
Tue, Oct 20 - Fri, Oct 23

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American Airlines flights from Ontario to Milwaukee

Our best American Airlines deals on Ontario to Milwaukee flight tickets
American Airlines
Sep 30
ONT12:37 pmOntario
7h 11m
1 stop
MKE9:48 pmMilwaukee-Mitchell
Oct 3
MKE7:01 amMilwaukee-Mitchell
8h 24m
1 stop
ONT1:25 pmOntario
$377
American Airlines
Sep 30
ONT6:15 amOntario
11h 48m
2 stops
MKE8:03 pmMilwaukee-Mitchell
Oct 3
MKE5:43 pmMilwaukee-Mitchell
6h 54m
1 stop
ONT10:37 pmOntario
$382
American Airlines
Sep 30
ONT6:15 amOntario
10h 06m
2 stops
MKE6:21 pmMilwaukee-Mitchell
Oct 3
MKE8:31 amMilwaukee-Mitchell
11h 46m
2 stops
ONT6:17 pmOntario
$387

United Airlines flights from Ontario to Milwaukee

Our best United Airlines deals on Ontario to Milwaukee flight tickets
United Airlines
Oct 10
ONT1:22 pmOntario
7h 37m
2 stops
MKE10:59 pmMilwaukee-Mitchell
Oct 14
MKE2:20 pmMilwaukee-Mitchell
10h 31m
2 stops
ONT10:51 pmOntario
$424
United Airlines
Nov 10
ONT5:00 amOntario
6h 34m
1 stop
MKE1:34 pmMilwaukee-Mitchell
Nov 11
MKE2:35 pmMilwaukee-Mitchell
8h 16m
1 stop
ONT8:51 pmOntario
$477
United Airlines
Nov 10
ONT5:00 amOntario
6h 34m
1 stop
MKE1:34 pmMilwaukee-Mitchell
Nov 11
MKE8:50 amMilwaukee-Mitchell
11h 11m
2 stops
ONT6:01 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

OntarioMilwaukee

ONT Ontario - MKE Milwaukee-Mitchell

ONTMKE

Ontario

Wed 9/30

12:37 pm-9:48 pm

1 stop7h 11m

Milwaukee-Mitchell

Sat 10/3

7:01 am-1:25 pm

1 stop8h 24m

$377

OntarioMilwaukee

ONT Ontario - MKE Milwaukee-Mitchell

ONTMKE

Ontario

Thu 12/3

3:20 pm-10:40 pm

1 stop5h 20m

Milwaukee-Mitchell

Mon 12/7

2:50 pm-8:35 pm

1 stop7h 45m

$377

OntarioMilwaukee

ONT Ontario - MKE Milwaukee-Mitchell

ONTMKE

Ontario

Sat 10/10

6:00 am-5:13 pm

1 stop9h 13m

Milwaukee-Mitchell

Wed 10/14

2:39 pm-8:58 pm

1 stop8h 19m

$377

OntarioMilwaukee

ONT Ontario - MKE Milwaukee-Mitchell

ONTMKE

Ontario

Sat 10/10

1:22 pm-10:59 pm

2 stops7h 37m

Milwaukee-Mitchell

Wed 10/14

2:39 pm-8:58 pm

1 stop8h 19m

$382

OntarioMilwaukee

ONT Ontario - MKE Milwaukee-Mitchell

ONTMKE

Ontario

Thu 12/3

5:55 am-4:10 pm

2 stops8h 15m

Milwaukee-Mitchell

Mon 12/7

2:50 pm-8:35 pm

1 stop7h 45m

$382

OntarioMilwaukee

ONT Ontario - MKE Milwaukee-Mitchell

ONTMKE

Ontario

Wed 9/30

6:15 am-8:03 pm

2 stops11h 48m

Milwaukee-Mitchell

Sat 10/3

5:43 pm-10:37 pm

1 stop6h 54m

$382

OntarioMilwaukee

ONT Ontario - MKE Milwaukee-Mitchell

ONTMKE

Ontario

Thu 12/3

11:08 pm-12:32 pm

2 stops11h 24m

Milwaukee-Mitchell

Mon 12/7

3:19 pm-11:58 pm

2 stops10h 39m

$387

OntarioMilwaukee

ONT Ontario - MKE Milwaukee-Mitchell

ONTMKE

Ontario

Wed 9/30

6:15 am-6:21 pm

2 stops10h 06m

Milwaukee-Mitchell

Sat 10/3

8:31 am-6:17 pm

2 stops11h 46m

$387
Quickest round-trip

OntarioMilwaukee

ONT Ontario - MKE Milwaukee-Mitchell

ONTMKE

Ontario

Wed 11/25

5:00 pm-12:15 am

1 stop5h 15m

Milwaukee-Mitchell

Thu 11/26

12:55 pm-4:50 pm

1 stop5h 55m

$390

OntarioMilwaukee

ONT Ontario - MKE Milwaukee-Mitchell

ONTMKE

Ontario

Tue 10/20

12:16 pm-9:23 pm

1 stop7h 07m

Milwaukee-Mitchell

Fri 10/23

5:30 am-11:06 am

1 stop7h 36m

$394

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

Prices are currently low for flights on this route.

Typical prices usually range from $412 to $582.
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 November. Flight prices, which tend to average around $378, 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 September 2026, prices for Ontario to Milwaukee flights are approximately 52% 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

Best Price Found

$146

Fastest flight time

5h 50m

Direct flights

None
The best one-way flight to Milwaukee from Ontario in the past 72 hours is $146. 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 50m
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 50m, 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
United AirlinesPriceFrom $309Free CancellationRating
7.4
10,194 reviews
Search United Airlines flights
SouthwestPriceFrom $354Free CancellationRating
8.0
4,195 reviews
Search Southwest flights
American AirlinesPriceFrom $366Free CancellationRating
7.1
12,045 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
Mequon
Glendale
Wauwatosa
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.

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