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Cheap flights from Ontario to Milwaukee from $175

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
12:43 pm - 9:52 pmONT  Ontario-MKE Milwaukee-Mitchell
7h 09m1 stop Dallas/Fort Worth
American Airlines Logo
12:21 pm - 6:44 pmMKE  Milwaukee-Mitchell-ONT Ontario
8h 23m1 stop Dallas/Fort Worth
$357American Airlines
Wed, Oct 21 - Wed, Oct 28
Delta Logo
1:35 pm - 9:56 pmONT  Ontario-MKE Milwaukee-Mitchell
6h 21m1 stop Salt Lake City
Delta Logo
12:42 pm - 7:30 pmMKE  Milwaukee-Mitchell-ONT Ontario
8h 48m1 stop Atlanta Hartsfield-Jackson
$357Delta
Tue, Oct 27 - Sat, Oct 31
Delta Logo
12:18 pm - 11:54 pmONT  Ontario-MKE Milwaukee-Mitchell
9h 36m1 stop Atlanta Hartsfield-Jackson
Delta Logo
5:20 am - 11:03 amMKE  Milwaukee-Mitchell-ONT Ontario
7h 43m1 stop Atlanta Hartsfield-Jackson
$357Delta
Wed, Nov 11 - Tue, Nov 17
American Airlines Logo
7:34 pm - 8:07 amONT  Ontario-MKE Milwaukee-Mitchell
10h 33m2 stops Phoenix Sky Harbor Intl Chicago O'Hare Intl
American Airlines Logo
12:21 pm - 6:44 pmMKE  Milwaukee-Mitchell-ONT Ontario
8h 23m1 stop Dallas/Fort Worth
$362American Airlines
Wed, Oct 21 - Wed, Oct 28
American Airlines Logo
7:34 pm - 8:07 amONT  Ontario-MKE Milwaukee-Mitchell
10h 33m2 stops Phoenix Sky Harbor Intl Chicago O'Hare Intl
American Airlines Logo
5:00 am - 12:14 pmMKE  Milwaukee-Mitchell-ONT Ontario
9h 14m2 stops Chicago O'Hare Intl Phoenix Sky Harbor Intl
$367American Airlines
Wed, Oct 21 - Wed, Oct 28
Delta Logo
6:00 pm - 8:40 amONT  Ontario-MKE Milwaukee-Mitchell
12h 40m2 stops Seattle/Tacoma Intl Detroit Metropolitan Wayne County
Delta Logo
10:49 am - 10:43 pmMKE  Milwaukee-Mitchell-ONT Ontario
13h 54m2 stops Minneapolis St Paul Seattle/Tacoma Intl
$368Delta
Sat, Oct 17 - Tue, Oct 20
Southwest Logo
6:50 am - 2:05 pmONT  Ontario-MKE Milwaukee-Mitchell
5h 15m1 stop Denver Intl
Southwest Logo
1:55 pm - 9:05 pmMKE  Milwaukee-Mitchell-ONT Ontario
9h 10m1 stop Dallas Love Field
$372Southwest
Tue, Nov 17 - Sat, Nov 21
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
8:00 pm - 11:45 pmMKE  Milwaukee-Mitchell-ONT Ontario
5h 45m1 stop Las Vegas Harry Reid Intl
$377Southwest
Tue, Nov 17 - Sat, Nov 21
United Airlines Logo
6:59 am - 2:58 pmONT  Ontario-MKE Milwaukee-Mitchell
5h 59m1 stop Chicago O'Hare Intl
United Airlines Logo
2:35 pm - 8:51 pmMKE  Milwaukee-Mitchell-ONT Ontario
8h 16m1 stop Denver Intl
$477United Airlines
Sat, Oct 31 - Sat, Nov 7
United Airlines Logo
7:00 am - 5:18 pmONT  Ontario-MKE Milwaukee-Mitchell
8h 18m1 stop Chicago O'Hare Intl
United Airlines Logo
12:15 pm - 6:44 pmMKE  Milwaukee-Mitchell-ONT Ontario
8h 29m1 stop Chicago O'Hare Intl
$477United Airlines
Thu, Dec 10 - Mon, Dec 14

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Alaska Airlines flights from Ontario to Milwaukee

Our best Alaska Airlines deals on Ontario to Milwaukee flight tickets
Alaska Airlines
Dec 5
ONT6:00 amOntario
7h 27m
1 stop
MKE3:27 pmMilwaukee-Mitchell
Dec 7
MKE4:25 pmMilwaukee-Mitchell
8h 34m
1 stop
ONT10:59 pmOntario
$385
Alaska Airlines
Oct 17
ONT6:02 amOntario
14h 40m
2 stops
MKE10:42 pmMilwaukee-Mitchell
Oct 20
MKE11:42 amMilwaukee-Mitchell
24h 35m
2 stops
ONT10:17 amOntario
$468
Alaska Airlines
Nov 12
ONT6:00 amOntario
7h 42m
1 stop
MKE3:42 pmMilwaukee-Mitchell
Nov 17
MKE5:04 amMilwaukee-Mitchell
15h 13m
2 stops
ONT6:17 pmOntario
$490

American Airlines flights from Ontario to Milwaukee

Our best American Airlines deals on Ontario to Milwaukee flight tickets
American Airlines
Oct 21
ONT12:43 pmOntario
7h 09m
1 stop
MKE9:52 pmMilwaukee-Mitchell
Oct 28
MKE12:21 pmMilwaukee-Mitchell
8h 23m
1 stop
ONT6:44 pmOntario
$357
American Airlines
Oct 21
ONT7:34 pmOntario
10h 33m
2 stops
MKE8:07 amMilwaukee-Mitchell
Oct 28
MKE12:21 pmMilwaukee-Mitchell
8h 23m
1 stop
ONT6:44 pmOntario
$362
American Airlines
Oct 21
ONT7:34 pmOntario
10h 33m
2 stops
MKE8:07 amMilwaukee-Mitchell
Oct 28
MKE5:00 amMilwaukee-Mitchell
9h 14m
2 stops
ONT12:14 pmOntario
$367

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 10/21

12:43 pm-9:52 pm

1 stop7h 09m

Milwaukee-Mitchell

Wed 10/28

12:21 pm-6:44 pm

1 stop8h 23m

$357

OntarioMilwaukee

ONT Ontario - MKE Milwaukee-Mitchell

ONTMKE

Ontario

Tue 10/27

1:35 pm-9:56 pm

1 stop6h 21m

Milwaukee-Mitchell

Sat 10/31

12:42 pm-7:30 pm

1 stop8h 48m

$357

OntarioMilwaukee

ONT Ontario - MKE Milwaukee-Mitchell

ONTMKE

Ontario

Wed 11/11

12:18 pm-11:54 pm

1 stop9h 36m

Milwaukee-Mitchell

Tue 11/17

5:20 am-11:03 am

1 stop7h 43m

$357

OntarioMilwaukee

ONT Ontario - MKE Milwaukee-Mitchell

ONTMKE

Ontario

Wed 10/21

7:34 pm-8:07 am

2 stops10h 33m

Milwaukee-Mitchell

Wed 10/28

12:21 pm-6:44 pm

1 stop8h 23m

$362

OntarioMilwaukee

ONT Ontario - MKE Milwaukee-Mitchell

ONTMKE

Ontario

Wed 10/21

7:34 pm-8:07 am

2 stops10h 33m

Milwaukee-Mitchell

Wed 10/28

5:00 am-12:14 pm

2 stops9h 14m

$367

OntarioMilwaukee

ONT Ontario - MKE Milwaukee-Mitchell

ONTMKE

Ontario

Sat 10/17

6:00 pm-8:40 am

2 stops12h 40m

Milwaukee-Mitchell

Tue 10/20

10:49 am-10:43 pm

2 stops13h 54m

$368

OntarioMilwaukee

ONT Ontario - MKE Milwaukee-Mitchell

ONTMKE

Ontario

Tue 11/17

6:50 am-2:05 pm

1 stop5h 15m

Milwaukee-Mitchell

Sat 11/21

1:55 pm-9:05 pm

1 stop9h 10m

$372
Quickest round-trip

OntarioMilwaukee

ONT Ontario - MKE Milwaukee-Mitchell

ONTMKE

Ontario

Tue 11/17

1:30 pm-11:15 pm

2 stops7h 45m

Milwaukee-Mitchell

Sat 11/21

8:00 pm-11:45 pm

1 stop5h 45m

$377

OntarioMilwaukee

ONT Ontario - MKE Milwaukee-Mitchell

ONTMKE

Ontario

Sat 10/31

6:59 am-2:58 pm

1 stop5h 59m

Milwaukee-Mitchell

Sat 11/7

2:35 pm-8:51 pm

1 stop8h 16m

$477

OntarioMilwaukee

ONT Ontario - MKE Milwaukee-Mitchell

ONTMKE

Ontario

Thu 12/10

7:00 am-5:18 pm

1 stop8h 18m

Milwaukee-Mitchell

Mon 12/14

12:15 pm-6:44 pm

1 stop8h 29m

$477

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 $433 to $550.
The lowest price recently found on this route was $357.

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 February is another great option to travel to Milwaukee, with average flight prices from Ontario averaging around $426.

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

$175

Fastest flight time

5h 15m

Direct flights

None
The best one-way flight to Milwaukee from Ontario in the past 72 hours is $175. 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 5h 15m
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 15m, 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 $354Free CancellationRating
8.0
4,199 reviews
Search Southwest flights
American AirlinesPriceFrom $366Free CancellationRating
7.0
12,075 reviews
Search American Airlines flights
United AirlinesPriceFrom $378Free CancellationRating
7.4
10,233 reviews
Search United 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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