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Cheap flights from Ontario to Milwaukee from $93

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 3/25. 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
0 bags

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Find the cheapest flights from Ontario to Milwaukee

Cheap round-trip flights

Enter your travel dates to find the best prices.
Frontier Logo
5:33 pm - 5:44 pm
ONT
-
MKE
22h 11m
1 stop
Frontier Logo
6:29 pm - 11:55 pm
MKE
-
ONT
7h 26m
1 stop
$212Frontier
Thu, Apr 16 - Fri, Apr 24
Frontier Logo
11:17 am - 1:02 pm
ONT
-
MKE
23h 45m
1 stop
Frontier Logo
2:00 pm - 8:04 am
MKE
-
ONT
20h 04m
1 stop
$255Frontier
Mon, Mar 30 - Sun, Apr 5
Frontier Logo
6:15 am - 6:51 pm
ONT
-
MKE
10h 36m
1 stop
Frontier Logo
12:59 pm - 5:15 pm
MKE
-
ONT
6h 16m
1 stop
$264Frontier
Fri, Mar 27 - Thu, Apr 2
Frontier Logo
10:03 pm - 1:02 pm
ONT
-
MKE
12h 59m
1 stop
Frontier Logo
7:15 pm - 11:59 pm
MKE
-
ONT
6h 44m
1 stop
$271Frontier
Wed, Mar 25 - Mon, Mar 30
Alaska Airlines Logo
6:00 am - 2:13 pm
ONT
-
MKE
30h 13m
1 stop
Alaska Airlines Logo
7:00 am - 9:45 am
MKE
-
ONT
28h 45m
1 stop
$283Alaska Airlines
Tue, Apr 21 - Wed, Apr 29
Alaska Airlines Logo
3:26 pm - 11:58 pm
ONT
-
MKE
30h 32m
1 stop
Alaska Airlines Logo
7:00 am - 9:45 am
MKE
-
ONT
28h 45m
1 stop
$295Alaska Airlines
Wed, Apr 22 - Tue, Apr 28
Multiple Airlines Logo
11:17 am - 1:02 pm
ONT
-
MKE
23h 45m
1 stop
Multiple Airlines Logo
3:10 pm - 11:59 pm
MKE
-
ONT
10h 49m
1 stop
$304Multiple Airlines
Mon, Mar 30 - Wed, Apr 1
Frontier Logo
6:15 am - 6:51 pm
ONT
-
MKE
10h 36m
1 stop
Frontier Logo
7:15 pm - 11:59 pm
MKE
-
ONT
6h 44m
1 stop
$310Frontier
Fri, Mar 20 - Mon, Mar 23
Alaska Airlines Logo
3:26 pm - 11:58 pm
ONT
-
MKE
30h 32m
1 stop
Alaska Airlines Logo
7:00 am - 9:45 am
MKE
-
ONT
28h 45m
1 stop
$313Alaska Airlines
Wed, Apr 22 - Tue, Apr 28
Alaska Airlines Logo
7:59 pm - 2:43 pm
ONT
-
MKE
16h 44m
1 stop
Alaska Airlines Logo
3:09 pm - 9:45 am
MKE
-
ONT
20h 36m
1 stop
$324Alaska Airlines
Fri, May 1 - Mon, May 4

American Airlines flights from Ontario to Milwaukee

Our best American Airlines deals on Ontario to Milwaukee flight tickets
American Airlines
Mar 30
ONT7:59 pmOntario
9h 50m
2 stops
MKE7:49 amMilwaukee-Mitchell
Apr 1
MKE11:51 amMilwaukee-Mitchell
8h 51m
1 stop
ONT6:42 pmOntario
$356
American Airlines
Mar 14
ONT6:00 amOntario
8h 59m
1 stop
MKE4:59 pmMilwaukee-Mitchell
Mar 19
MKE11:51 amMilwaukee-Mitchell
9h 01m
1 stop
ONT6:52 pmOntario
$428
American Airlines
Mar 9
ONT7:59 pmOntario
9h 50m
2 stops
MKE7:49 amMilwaukee-Mitchell
Mar 10
MKE11:51 amMilwaukee-Mitchell
12h 16m
2 stops
ONT10:07 pmOntario
$567

United Airlines flights from Ontario to Milwaukee

Our best United Airlines deals on Ontario to Milwaukee flight tickets
United Airlines
Mar 17
ONT11:59 pmOntario
8h 31m
1 stop
MKE10:30 amMilwaukee-Mitchell
Mar 18
MKE2:54 pmMilwaukee-Mitchell
9h 24m
1 stop
ONT10:18 pmOntario
$407
United Airlines
Mar 17
ONT6:15 amOntario
13h 12m
2 stops
MKE9:27 pmMilwaukee-Mitchell
Mar 18
MKE2:54 pmMilwaukee-Mitchell
9h 24m
1 stop
ONT10:18 pmOntario
$412
United Airlines
Mar 19
ONT11:59 pmOntario
8h 31m
1 stop
MKE10:30 amMilwaukee-Mitchell
Mar 24
MKE3:45 pmMilwaukee-Mitchell
7h 05m
1 stop
ONT8:50 pmOntario
$417

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 February 24, 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

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Thu 4/16

5:33 pm-5:44 pm

1 stop22h 11m

Milwaukee-Mitchell

Fri 4/24

6:29 pm-11:55 pm

1 stop7h 26m

$212

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Mon 3/30

11:17 am-1:02 pm

1 stop23h 45m

Milwaukee-Mitchell

Sun 4/5

2:00 pm-8:04 am

1 stop20h 04m

$255

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Fri 3/27

6:15 am-6:51 pm

1 stop10h 36m

Milwaukee-Mitchell

Thu 4/2

12:59 pm-5:15 pm

1 stop6h 16m

$264

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Wed 3/25

10:03 pm-1:02 pm

1 stop12h 59m

Milwaukee-Mitchell

Mon 3/30

7:15 pm-11:59 pm

1 stop6h 44m

$271

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Tue 4/21

6:00 am-2:13 pm

1 stop30h 13m

Milwaukee-Mitchell

Wed 4/29

7:00 am-9:45 am

1 stop28h 45m

$283

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Wed 4/22

3:26 pm-11:58 pm

1 stop30h 32m

Milwaukee-Mitchell

Tue 4/28

7:00 am-9:45 am

1 stop28h 45m

$295

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Mon 3/30

11:17 am-1:02 pm

1 stop23h 45m

Milwaukee-Mitchell

Wed 4/1

3:10 pm-11:59 pm

1 stop10h 49m

$304

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Fri 3/20

6:15 am-6:51 pm

1 stop10h 36m

Milwaukee-Mitchell

Mon 3/23

7:15 pm-11:59 pm

1 stop6h 44m

$310

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Wed 4/22

3:26 pm-11:58 pm

1 stop30h 32m

Milwaukee-Mitchell

Tue 4/28

7:00 am-9:45 am

1 stop28h 45m

$313

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Fri 5/1

7:59 pm-2:43 pm

1 stop16h 44m

Milwaukee-Mitchell

Mon 5/4

3:09 pm-9:45 am

1 stop20h 36m

$324

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 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 May is another great option to travel to Milwaukee, with average flight prices from Ontario averaging around $374.

What is the cheapest day to depart on your flight to Milwaukee?

According to our data, Thursday is the cheapest day to fly to Milwaukee from Ontario. The lowest ticket price found for a Thursday departure recently was $181. 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 Sunday will generally be more expensive and average around $189. 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 February 2026, prices for Ontario to Milwaukee flights are approximately 73% 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

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

  • 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
DeltaPriceFrom $253Free CancellationRating
7.9
8,239 reviews
Search Delta flights
American AirlinesPriceFrom $276Free CancellationRating
7.2
11,344 reviews
Search American Airlines flights
United AirlinesPriceFrom $309Free CancellationRating
7.4
9,344 reviews
Search United Airlines flights
SouthwestPriceFrom $326Free CancellationRating
8.0
4,300 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
Pewaukee
Kohler
Port Washington
West Bend
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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