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Cheap flights from Ontario to Milwaukee from $134

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 9/30. 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.
American Airlines Logo
12:37 pm - 9:48 pmONT  Ontario-MKE Milwaukee-Mitchell
7h 11m1 stop Dallas/Fort Worth
American Airlines Logo
5:43 pm - 10:37 pmMKE  Milwaukee-Mitchell-ONT Ontario
6h 54m1 stop Dallas/Fort Worth
$267American Airlines
Tue, Sep 22 - Tue, Sep 29
American Airlines Logo
10:25 am - 9:48 pmONT  Ontario-MKE Milwaukee-Mitchell
9h 23m1 stop Dallas/Fort Worth
American Airlines Logo
7:01 am - 1:25 pmMKE  Milwaukee-Mitchell-ONT Ontario
8h 24m1 stop Dallas/Fort Worth
$267American Airlines
Tue, Sep 15 - Sat, Sep 19
American Airlines Logo
12:43 pm - 9:52 pmONT  Ontario-MKE Milwaukee-Mitchell
7h 09m1 stop Dallas/Fort Worth
American Airlines Logo
7:14 am - 1:30 pmMKE  Milwaukee-Mitchell-ONT Ontario
8h 16m1 stop Dallas/Fort Worth
$267American Airlines
Tue, Oct 27 - Sat, Oct 31
Southwest Logo
9:15 am - 6:50 pmONT  Ontario-MKE Milwaukee-Mitchell
7h 35m1 stop Denver Intl
Southwest Logo
5:30 am - 11:15 amMKE  Milwaukee-Mitchell-ONT Ontario
7h 45m1 stop Phoenix Sky Harbor Intl
$268Southwest
Sat, Sep 12 - Sat, Sep 19
Southwest Logo
5:45 am - 1:25 pmONT  Ontario-MKE Milwaukee-Mitchell
5h 40m1 stop Las Vegas Harry Reid Intl
Southwest Logo
5:00 pm - 9:20 pmMKE  Milwaukee-Mitchell-ONT Ontario
6h 20m1 stop Las Vegas Harry Reid Intl
$268Southwest
Tue, Sep 29 - Tue, Oct 6
Southwest Logo
7:45 am - 4:40 pmONT  Ontario-MKE Milwaukee-Mitchell
6h 55m1 stop Las Vegas Harry Reid Intl
Southwest Logo
2:00 pm - 7:20 pmMKE  Milwaukee-Mitchell-ONT Ontario
7h 20m1 stop Denver Intl
$268Southwest
Wed, Sep 9 - Fri, Sep 11
Delta Logo
12:17 pm - 9:30 pmONT  Ontario-MKE Milwaukee-Mitchell
7h 13m1 stop Atlanta Hartsfield-Jackson
Delta Logo
5:30 am - 11:05 amMKE  Milwaukee-Mitchell-ONT Ontario
7h 35m1 stop Atlanta Hartsfield-Jackson
$277Delta
Sat, Sep 19 - Tue, Sep 22
Delta Logo
12:17 pm - 9:30 pmONT  Ontario-MKE Milwaukee-Mitchell
7h 13m1 stop Atlanta Hartsfield-Jackson
Delta Logo
5:30 am - 11:05 amMKE  Milwaukee-Mitchell-ONT Ontario
7h 35m1 stop Atlanta Hartsfield-Jackson
$277Delta
Wed, Sep 16 - Tue, Sep 22
United Airlines Logo
7:00 am - 5:38 pmONT  Ontario-MKE Milwaukee-Mitchell
8h 38m1 stop Chicago O'Hare Intl
United Airlines Logo
2:35 pm - 8:51 pmMKE  Milwaukee-Mitchell-ONT Ontario
8h 16m1 stop Denver Intl
$303United Airlines
Fri, Nov 13 - Mon, Nov 16
United Airlines Logo
6:00 am - 5:09 pmONT  Ontario-MKE Milwaukee-Mitchell
9h 09m1 stop Houston George Bush Intcntl
United Airlines Logo
2:40 pm - 8:53 pmMKE  Milwaukee-Mitchell-ONT Ontario
8h 13m1 stop Denver Intl
$312United Airlines
Tue, Sep 22 - Wed, Sep 23

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Southwest flights from Ontario to Milwaukee

Our best Southwest deals on Ontario to Milwaukee flight tickets
Southwest
Sep 9
ONT7:45 amOntario
6h 55m
1 stop
MKE4:40 pmMilwaukee-Mitchell
Sep 11
MKE2:00 pmMilwaukee-Mitchell
7h 20m
1 stop
ONT7:20 pmOntario
$268
Southwest
Sep 12
ONT10:15 amOntario
8h 50m
2 stops
MKE9:05 pmMilwaukee-Mitchell
Sep 19
MKE5:30 amMilwaukee-Mitchell
7h 45m
1 stop
ONT11:15 amOntario
$273
Southwest
Oct 13
ONT10:55 amOntario
11h 00m
1 stop
MKE11:55 pmMilwaukee-Mitchell
Oct 17
MKE5:00 amMilwaukee-Mitchell
8h 10m
1 stop
ONT11:10 amOntario
$274

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 22
MKE5:30 amMilwaukee-Mitchell
7h 35m
1 stop
ONT11:05 amOntario
$277
Delta
Sep 5
ONT1:06 pmOntario
6h 35m
1 stop
MKE9:41 pmMilwaukee-Mitchell
Sep 12
MKE7:30 amMilwaukee-Mitchell
6h 44m
1 stop
ONT12:14 pmOntario
$278
Delta
Sep 5
ONT7:05 amOntario
7h 09m
1 stop
MKE4:14 pmMilwaukee-Mitchell
Sep 15
MKE2:55 pmMilwaukee-Mitchell
7h 29m
1 stop
ONT8:24 pmOntario
$300

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 August 15, 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

OntarioMilwaukee

ONT Ontario - MKE Milwaukee-Mitchell

ONTMKE

Ontario

Tue 9/22

12:37 pm-9:48 pm

1 stop7h 11m

Milwaukee-Mitchell

Tue 9/29

5:43 pm-10:37 pm

1 stop6h 54m

$267

OntarioMilwaukee

ONT Ontario - MKE Milwaukee-Mitchell

ONTMKE

Ontario

Tue 9/15

10:25 am-9:48 pm

1 stop9h 23m

Milwaukee-Mitchell

Sat 9/19

7:01 am-1:25 pm

1 stop8h 24m

$267

OntarioMilwaukee

ONT Ontario - MKE Milwaukee-Mitchell

ONTMKE

Ontario

Tue 10/27

12:43 pm-9:52 pm

1 stop7h 09m

Milwaukee-Mitchell

Sat 10/31

7:14 am-1:30 pm

1 stop8h 16m

$267

OntarioMilwaukee

ONT Ontario - MKE Milwaukee-Mitchell

ONTMKE

Ontario

Sat 9/12

9:15 am-6:50 pm

1 stop7h 35m

Milwaukee-Mitchell

Sat 9/19

5:30 am-11:15 am

1 stop7h 45m

$268
Quickest round-trip

OntarioMilwaukee

ONT Ontario - MKE Milwaukee-Mitchell

ONTMKE

Ontario

Tue 9/29

5:45 am-1:25 pm

1 stop5h 40m

Milwaukee-Mitchell

Tue 10/6

5:00 pm-9:20 pm

1 stop6h 20m

$268

OntarioMilwaukee

ONT Ontario - MKE Milwaukee-Mitchell

ONTMKE

Ontario

Wed 9/9

7:45 am-4:40 pm

1 stop6h 55m

Milwaukee-Mitchell

Fri 9/11

2:00 pm-7:20 pm

1 stop7h 20m

$268

OntarioMilwaukee

ONT Ontario - MKE Milwaukee-Mitchell

ONTMKE

Ontario

Sat 9/19

12:17 pm-9:30 pm

1 stop7h 13m

Milwaukee-Mitchell

Tue 9/22

5:30 am-11:05 am

1 stop7h 35m

$277

OntarioMilwaukee

ONT Ontario - MKE Milwaukee-Mitchell

ONTMKE

Ontario

Wed 9/16

12:17 pm-9:30 pm

1 stop7h 13m

Milwaukee-Mitchell

Tue 9/22

5:30 am-11:05 am

1 stop7h 35m

$277

OntarioMilwaukee

ONT Ontario - MKE Milwaukee-Mitchell

ONTMKE

Ontario

Fri 11/13

7:00 am-5:38 pm

1 stop8h 38m

Milwaukee-Mitchell

Mon 11/16

2:35 pm-8:51 pm

1 stop8h 16m

$303

OntarioMilwaukee

ONT Ontario - MKE Milwaukee-Mitchell

ONTMKE

Ontario

Tue 9/22

6:00 am-5:09 pm

1 stop9h 09m

Milwaukee-Mitchell

Wed 9/23

2:40 pm-8:53 pm

1 stop8h 13m

$312

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 $429 to $694.
The lowest price recently found on this route was $267.

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 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

Fastest flight time

5h 25m

Direct flights

None
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
11,927 reviews
Search American Airlines flights
United AirlinesPriceFrom $309Free CancellationRating
7.4
10,108 reviews
Search United Airlines flights
SouthwestPriceFrom $337Free CancellationRating
8.0
4,220 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.

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