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Cheap flights from Ontario to Milwaukee from $169

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
1:35 pm - 9:56 pmONT  Ontario-MKE Milwaukee-Mitchell
6h 21m1 stop Salt Lake City
Delta Logo
7:05 am - 12:36 pmMKE  Milwaukee-Mitchell-ONT Ontario
7h 31m1 stop Salt Lake City
$337Delta
Wed, Oct 14 - Sat, Oct 17
Delta Logo
1:35 pm - 9:56 pmONT  Ontario-MKE Milwaukee-Mitchell
6h 21m1 stop Salt Lake City
Delta Logo
2:59 pm - 8:25 pmMKE  Milwaukee-Mitchell-ONT Ontario
7h 26m1 stop Atlanta Hartsfield-Jackson
$337Delta
Wed, Oct 14 - Tue, Oct 20
Southwest Logo
12:40 pm - 10:50 pmONT  Ontario-MKE Milwaukee-Mitchell
8h 10m1 stop Denver Intl
Southwest Logo
6:25 am - 1:00 pmMKE  Milwaukee-Mitchell-ONT Ontario
8h 35m1 stop Las Vegas Harry Reid Intl
$337Southwest
Thu, Oct 29 - Sat, Oct 31
Delta Logo
12:19 pm - 11:48 pmONT  Ontario-MKE Milwaukee-Mitchell
9h 29m1 stop Atlanta Hartsfield-Jackson
Delta Logo
4:49 pm - 10:24 pmMKE  Milwaukee-Mitchell-ONT Ontario
7h 35m1 stop Atlanta Hartsfield-Jackson
$337Delta
Thu, Sep 24 - Thu, Oct 1
Southwest Logo
4:15 pm - 12:15 amONT  Ontario-MKE Milwaukee-Mitchell
6h 00m1 stop Phoenix Sky Harbor Intl
Southwest Logo
6:25 am - 12:45 pmMKE  Milwaukee-Mitchell-ONT Ontario
8h 20m2 stops Las Vegas Harry Reid Intl Phoenix Sky Harbor Intl
$342Southwest
Thu, Oct 29 - Sat, Oct 31
Southwest Logo
1:05 pm - 10:50 pmONT  Ontario-MKE Milwaukee-Mitchell
7h 45m2 stops Phoenix Sky Harbor Intl Denver Intl
Southwest Logo
5:35 am - 1:00 pmMKE  Milwaukee-Mitchell-ONT Ontario
9h 25m2 stops Denver Intl Las Vegas Harry Reid Intl
$347Southwest
Thu, Oct 29 - Sat, Oct 31
American Airlines Logo
12:43 pm - 9:52 pmONT  Ontario-MKE Milwaukee-Mitchell
7h 09m1 stop Dallas/Fort Worth
American Airlines Logo
6:19 pm - 11:46 pmMKE  Milwaukee-Mitchell-ONT Ontario
7h 27m1 stop Dallas/Fort Worth
$353American Airlines
Fri, Oct 30 - Mon, Nov 2
American Airlines Logo
7:20 am - 4:53 pmONT  Ontario-MKE Milwaukee-Mitchell
7h 33m1 stop Dallas/Fort Worth
American Airlines Logo
7:01 am - 11:47 amMKE  Milwaukee-Mitchell-ONT Ontario
6h 46m1 stop Dallas/Fort Worth
$375American Airlines
Wed, Sep 16 - Wed, Sep 23
United Airlines Logo
5:00 am - 1:34 pmONT  Ontario-MKE Milwaukee-Mitchell
6h 34m1 stop Denver Intl
United Airlines Logo
2:39 pm - 8:58 pmMKE  Milwaukee-Mitchell-ONT Ontario
8h 19m1 stop Denver Intl
$375United Airlines
Sat, Sep 12 - Sat, Oct 3
United Airlines Logo
6:08 am - 5:30 pmONT  Ontario-MKE Milwaukee-Mitchell
9h 22m2 stops San Francisco Chicago O'Hare Intl
United Airlines Logo
2:20 pm - 8:58 pmMKE  Milwaukee-Mitchell-ONT Ontario
8h 38m2 stops Chicago O'Hare Intl Denver Intl
$385United Airlines
Sat, Sep 12 - Sat, Oct 3

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Southwest flights from Ontario to Milwaukee

Our best Southwest deals on Ontario to Milwaukee flight tickets
Southwest
Oct 29
ONT4:15 pmOntario
6h 00m
1 stop
MKE12:15 amMilwaukee-Mitchell
Oct 31
MKE6:25 amMilwaukee-Mitchell
8h 20m
2 stops
ONT12:45 pmOntario
$342
Southwest
Oct 2
ONT2:50 pmOntario
5h 55m
1 stop
MKE10:45 pmMilwaukee-Mitchell
Oct 5
MKE6:30 pmMilwaukee-Mitchell
7h 25m
2 stops
ONT11:55 pmOntario
$358
Southwest
Oct 30
ONT1:05 pmOntario
7h 30m
2 stops
MKE10:35 pmMilwaukee-Mitchell
Nov 2
MKE5:00 amMilwaukee-Mitchell
10h 00m
2 stops
ONT1:00 pmOntario
$363

United Airlines flights from Ontario to Milwaukee

Our best United Airlines deals on Ontario to Milwaukee flight tickets
United Airlines
Sep 12
ONT6:08 amOntario
9h 22m
2 stops
MKE5:30 pmMilwaukee-Mitchell
Oct 3
MKE2:20 pmMilwaukee-Mitchell
8h 38m
2 stops
ONT8:58 pmOntario
$385
United Airlines
Jan 4
ONT5:00 amOntario
6h 42m
1 stop
MKE1:42 pmMilwaukee-Mitchell
Jan 9
MKE12:30 pmMilwaukee-Mitchell
9h 50m
2 stops
ONT8:20 pmOntario
$417
United Airlines
Sep 11
ONT1:18 pmOntario
5h 45m
1 stop
MKE9:03 pmMilwaukee-Mitchell
Sep 15
MKE5:00 amMilwaukee-Mitchell
11h 01m
2 stops
ONT2:01 pmOntario
$418

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 10/14

1:35 pm-9:56 pm

1 stop6h 21m

Milwaukee-Mitchell

Sat 10/17

7:05 am-12:36 pm

1 stop7h 31m

$337
Quickest round-trip

OntarioMilwaukee

ONT Ontario - MKE Milwaukee-Mitchell

ONTMKE

Ontario

Wed 10/14

1:35 pm-9:56 pm

1 stop6h 21m

Milwaukee-Mitchell

Tue 10/20

2:59 pm-8:25 pm

1 stop7h 26m

$337

OntarioMilwaukee

ONT Ontario - MKE Milwaukee-Mitchell

ONTMKE

Ontario

Thu 10/29

12:40 pm-10:50 pm

1 stop8h 10m

Milwaukee-Mitchell

Sat 10/31

6:25 am-1:00 pm

1 stop8h 35m

$337

OntarioMilwaukee

ONT Ontario - MKE Milwaukee-Mitchell

ONTMKE

Ontario

Thu 9/24

12:19 pm-11:48 pm

1 stop9h 29m

Milwaukee-Mitchell

Thu 10/1

4:49 pm-10:24 pm

1 stop7h 35m

$337

OntarioMilwaukee

ONT Ontario - MKE Milwaukee-Mitchell

ONTMKE

Ontario

Thu 10/29

4:15 pm-12:15 am

1 stop6h 00m

Milwaukee-Mitchell

Sat 10/31

6:25 am-12:45 pm

2 stops8h 20m

$342

OntarioMilwaukee

ONT Ontario - MKE Milwaukee-Mitchell

ONTMKE

Ontario

Thu 10/29

1:05 pm-10:50 pm

2 stops7h 45m

Milwaukee-Mitchell

Sat 10/31

5:35 am-1:00 pm

2 stops9h 25m

$347

OntarioMilwaukee

ONT Ontario - MKE Milwaukee-Mitchell

ONTMKE

Ontario

Fri 10/30

12:43 pm-9:52 pm

1 stop7h 09m

Milwaukee-Mitchell

Mon 11/2

6:19 pm-11:46 pm

1 stop7h 27m

$353

OntarioMilwaukee

ONT Ontario - MKE Milwaukee-Mitchell

ONTMKE

Ontario

Wed 9/16

7:20 am-4:53 pm

1 stop7h 33m

Milwaukee-Mitchell

Wed 9/23

7:01 am-11:47 am

1 stop6h 46m

$375

OntarioMilwaukee

ONT Ontario - MKE Milwaukee-Mitchell

ONTMKE

Ontario

Sat 9/12

5:00 am-1:34 pm

1 stop6h 34m

Milwaukee-Mitchell

Sat 10/3

2:39 pm-8:58 pm

1 stop8h 19m

$375

OntarioMilwaukee

ONT Ontario - MKE Milwaukee-Mitchell

ONTMKE

Ontario

Sat 9/12

6:08 am-5:30 pm

2 stops9h 22m

Milwaukee-Mitchell

Sat 10/3

2:20 pm-8:58 pm

2 stops8h 38m

$385

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 $366 to $561.
The lowest price recently found on this route was $337.

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 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

$169

Fastest flight time

5h 43m

Direct flights

None
The best one-way flight to Milwaukee from Ontario in the past 72 hours is $169. The best round-trip flight deal from Ontario to Milwaukee found on momondo in the last 72 hours is $337.
The fastest flight from Ontario to Milwaukee takes 5h 43m
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 43m, 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
10,146 reviews
Search United Airlines flights
SouthwestPriceFrom $354Free CancellationRating
8.0
4,195 reviews
Search Southwest flights
American AirlinesPriceFrom $366Free CancellationRating
7.1
12,019 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
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.

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