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Cheap flights from Ontario to Milwaukee from $179

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.
Southwest Logo
3:00 pm - 10:15 pmONT  Ontario-MKE Milwaukee-Mitchell
5h 15m1 stop Phoenix Sky Harbor Intl
Southwest Logo
5:45 pm - 9:45 pmMKE  Milwaukee-Mitchell-ONT Ontario
6h 00m1 stop Denver Intl
$357Southwest
Mon, Jan 25 - Fri, Jan 29
Southwest Logo
5:45 am - 2:55 pmONT  Ontario-MKE Milwaukee-Mitchell
7h 10m1 stop Las Vegas Harry Reid Intl
Southwest Logo
5:55 pm - 9:40 pmMKE  Milwaukee-Mitchell-ONT Ontario
5h 45m1 stop Denver Intl
$357Southwest
Wed, Dec 16 - Thu, Dec 31
Delta Logo
1:15 pm - 9:55 pmONT  Ontario-MKE Milwaukee-Mitchell
6h 40m1 stop Salt Lake City
Delta Logo
5:20 am - 11:03 amMKE  Milwaukee-Mitchell-ONT Ontario
7h 43m1 stop Atlanta Hartsfield-Jackson
$357Delta
Sat, Nov 21 - Thu, Nov 26
Delta Logo
1:35 pm - 9:56 pmONT  Ontario-MKE Milwaukee-Mitchell
6h 21m1 stop Salt Lake City
Delta Logo
5:20 am - 11:03 amMKE  Milwaukee-Mitchell-ONT Ontario
7h 43m1 stop Atlanta Hartsfield-Jackson
$357Delta
Fri, Nov 6 - Wed, Nov 11
Delta Logo
1:15 pm - 9:55 pmONT  Ontario-MKE Milwaukee-Mitchell
6h 40m1 stop Salt Lake City
Delta Logo
5:20 am - 11:03 amMKE  Milwaukee-Mitchell-ONT Ontario
7h 43m1 stop Atlanta Hartsfield-Jackson
$357Delta
Wed, Nov 25 - Thu, Nov 26
Southwest Logo
12:50 pm - 10:40 pmONT  Ontario-MKE Milwaukee-Mitchell
7h 50m2 stops Phoenix Sky Harbor Intl Las Vegas Harry Reid Intl
Southwest Logo
5:55 pm - 9:40 pmMKE  Milwaukee-Mitchell-ONT Ontario
5h 45m1 stop Denver Intl
$362Southwest
Wed, Dec 16 - Thu, Dec 31
American Airlines Logo
6:30 am - 1:55 pmONT  Ontario-MKE Milwaukee-Mitchell
5h 25m1 stop Phoenix Sky Harbor Intl
American Airlines Logo
6:21 pm - 11:59 pmMKE  Milwaukee-Mitchell-ONT Ontario
7h 38m1 stop Dallas/Fort Worth
$384American Airlines
Sat, Nov 14 - Sun, Nov 22
American Airlines Logo
10:30 am - 9:56 pmONT  Ontario-MKE Milwaukee-Mitchell
9h 26m1 stop Dallas/Fort Worth
American Airlines Logo
7:05 am - 1:31 pmMKE  Milwaukee-Mitchell-ONT Ontario
8h 26m1 stop Dallas/Fort Worth
$397American Airlines
Wed, Nov 11 - Sun, Nov 15
American Airlines Logo
10:30 am - 9:56 pmONT  Ontario-MKE Milwaukee-Mitchell
9h 26m1 stop Dallas/Fort Worth
American Airlines Logo
2:45 pm - 7:09 pmMKE  Milwaukee-Mitchell-ONT Ontario
6h 24m1 stop Phoenix Sky Harbor Intl
$397American Airlines
Wed, Nov 11 - Sun, Nov 15
Southwest Logo
12:50 pm - 10:40 pmONT  Ontario-MKE Milwaukee-Mitchell
7h 50m2 stops Phoenix Sky Harbor Intl Las Vegas Harry Reid Intl
Southwest Logo
5:45 am - 11:55 amMKE  Milwaukee-Mitchell-ONT Ontario
8h 10m2 stops Denver Intl Las Vegas Harry Reid Intl
$417Southwest
Wed, Dec 16 - Thu, Dec 31

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Southwest flights from Ontario to Milwaukee

Our best Southwest deals on Ontario to Milwaukee flight tickets
Southwest
Dec 16
ONT12:50 pmOntario
7h 50m
2 stops
MKE10:40 pmMilwaukee-Mitchell
Dec 31
MKE5:55 pmMilwaukee-Mitchell
5h 45m
1 stop
ONT9:40 pmOntario
$362
Southwest
Dec 16
ONT12:50 pmOntario
7h 50m
2 stops
MKE10:40 pmMilwaukee-Mitchell
Dec 31
MKE5:45 amMilwaukee-Mitchell
8h 10m
2 stops
ONT11:55 amOntario
$417
Southwest
Nov 8
ONT5:20 pmOntario
5h 25m
1 stop
MKE12:45 amMilwaukee-Mitchell
Nov 9
MKE3:55 pmMilwaukee-Mitchell
9h 45m
2 stops
ONT11:40 pmOntario
$433

American Airlines flights from Ontario to Milwaukee

Our best American Airlines deals on Ontario to Milwaukee flight tickets
American Airlines
Nov 14
ONT6:30 amOntario
5h 25m
1 stop
MKE1:55 pmMilwaukee-Mitchell
Nov 22
MKE6:21 pmMilwaukee-Mitchell
7h 38m
1 stop
ONT11:59 pmOntario
$384
American Airlines
Nov 24
ONT10:37 amOntario
9h 25m
1 stop
MKE10:02 pmMilwaukee-Mitchell
Dec 1
MKE7:00 amMilwaukee-Mitchell
10h 35m
2 stops
ONT3:35 pmOntario
$400
American Airlines
Nov 11
ONT9:50 amOntario
10h 06m
2 stops
MKE9:56 pmMilwaukee-Mitchell
Nov 15
MKE7:05 amMilwaukee-Mitchell
8h 26m
1 stop
ONT1:31 pmOntario
$402

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
Quickest round-trip

OntarioMilwaukee

ONT Ontario - MKE Milwaukee-Mitchell

ONTMKE

Ontario

Mon 1/25

3:00 pm-10:15 pm

1 stop5h 15m

Milwaukee-Mitchell

Fri 1/29

5:45 pm-9:45 pm

1 stop6h 00m

$357

OntarioMilwaukee

ONT Ontario - MKE Milwaukee-Mitchell

ONTMKE

Ontario

Wed 12/16

5:45 am-2:55 pm

1 stop7h 10m

Milwaukee-Mitchell

Thu 12/31

5:55 pm-9:40 pm

1 stop5h 45m

$357

OntarioMilwaukee

ONT Ontario - MKE Milwaukee-Mitchell

ONTMKE

Ontario

Sat 11/21

1:15 pm-9:55 pm

1 stop6h 40m

Milwaukee-Mitchell

Thu 11/26

5:20 am-11:03 am

1 stop7h 43m

$357

OntarioMilwaukee

ONT Ontario - MKE Milwaukee-Mitchell

ONTMKE

Ontario

Fri 11/6

1:35 pm-9:56 pm

1 stop6h 21m

Milwaukee-Mitchell

Wed 11/11

5:20 am-11:03 am

1 stop7h 43m

$357

OntarioMilwaukee

ONT Ontario - MKE Milwaukee-Mitchell

ONTMKE

Ontario

Wed 11/25

1:15 pm-9:55 pm

1 stop6h 40m

Milwaukee-Mitchell

Thu 11/26

5:20 am-11:03 am

1 stop7h 43m

$357

OntarioMilwaukee

ONT Ontario - MKE Milwaukee-Mitchell

ONTMKE

Ontario

Wed 12/16

12:50 pm-10:40 pm

2 stops7h 50m

Milwaukee-Mitchell

Thu 12/31

5:55 pm-9:40 pm

1 stop5h 45m

$362

OntarioMilwaukee

ONT Ontario - MKE Milwaukee-Mitchell

ONTMKE

Ontario

Sat 11/14

6:30 am-1:55 pm

1 stop5h 25m

Milwaukee-Mitchell

Sun 11/22

6:21 pm-11:59 pm

1 stop7h 38m

$384

OntarioMilwaukee

ONT Ontario - MKE Milwaukee-Mitchell

ONTMKE

Ontario

Wed 11/11

10:30 am-9:56 pm

1 stop9h 26m

Milwaukee-Mitchell

Sun 11/15

7:05 am-1:31 pm

1 stop8h 26m

$397

OntarioMilwaukee

ONT Ontario - MKE Milwaukee-Mitchell

ONTMKE

Ontario

Wed 11/11

10:30 am-9:56 pm

1 stop9h 26m

Milwaukee-Mitchell

Sun 11/15

2:45 pm-7:09 pm

1 stop6h 24m

$397

OntarioMilwaukee

ONT Ontario - MKE Milwaukee-Mitchell

ONTMKE

Ontario

Wed 12/16

12:50 pm-10:40 pm

2 stops7h 50m

Milwaukee-Mitchell

Thu 12/31

5:45 am-11:55 am

2 stops8h 10m

$417

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 $445 to $527.
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 $426, 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 October 2026, prices for Ontario to Milwaukee flights are approximately 41% 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

$179

Fastest flight time

5h 30m

Direct flights

None
The best one-way flight to Milwaukee from Ontario in the past 72 hours is $179. 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 30m
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 30m, 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
7.9
4,216 reviews
Search Southwest flights
American AirlinesPriceFrom $366Free CancellationRating
7.0
12,168 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
Wauwatosa
Glendale
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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