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Cheap flights from Ontario to Milwaukee from $107

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
1 adult, Economy, 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
5:05 pm - 11:55 pm
MKE
-
ONT
8h 50m
1 stop
$201Frontier
Thu, Apr 16 - Mon, Apr 20
Frontier Logo
5:33 pm - 5:44 pm
ONT
-
MKE
22h 11m
1 stop
Frontier Logo
5:05 pm - 11:55 pm
MKE
-
ONT
8h 50m
1 stop
$221Frontier
Thu, Apr 16 - Mon, Apr 20
Frontier Logo
12:59 am - 5:34 pm
ONT
-
MKE
14h 35m
1 stop
Frontier Logo
5:05 pm - 11:55 pm
MKE
-
ONT
8h 50m
1 stop
$222Frontier
Thu, Apr 23 - Mon, Apr 27
Frontier Logo
4:52 pm - 12:02 pm
ONT
-
MKE
17h 10m
1 stop
Frontier Logo
2:00 pm - 8:04 am
MKE
-
ONT
20h 04m
1 stop
$251Frontier
Wed, Apr 1 - Sun, Apr 5
Delta Logo
10:25 pm - 9:04 am
ONT
-
MKE
8h 39m
1 stop
Delta Logo
12:33 pm - 9:00 pm
MKE
-
ONT
10h 27m
1 stop
$317Delta
Tue, Apr 7 - Tue, Apr 14
Multiple Airlines Logo
7:08 pm - 10:43 am
ONT
-
MKE
13h 35m
2 stops
Multiple Airlines Logo
5:05 pm - 11:55 pm
MKE
-
ONT
8h 50m
1 stop
$329Multiple Airlines
Thu, Apr 16 - Mon, Apr 20
Delta Logo
12:49 pm - 11:57 pm
ONT
-
MKE
9h 08m
1 stop
Delta Logo
7:25 am - 12:14 pm
MKE
-
ONT
6h 49m
1 stop
$337Delta
Thu, Apr 30 - Tue, May 5
Southwest Logo
3:45 pm - 11:10 pm
ONT
-
MKE
5h 25m
1 stop
Southwest Logo
4:10 pm - 10:45 pm
MKE
-
ONT
8h 35m
2 stops
$342Southwest
Tue, May 26 - Tue, Jun 9
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
$343Alaska Airlines
Tue, Apr 28 - Wed, May 6
Delta Logo
5:55 pm - 8:49 am
ONT
-
MKE
12h 54m
2 stops
Delta Logo
7:25 am - 12:14 pm
MKE
-
ONT
6h 49m
1 stop
$355Delta
Fri, Apr 17 - Mon, Apr 20

Alaska Airlines flights from Ontario to Milwaukee

Our best Alaska Airlines deals on Ontario to Milwaukee flight tickets
Alaska Airlines
Apr 28
ONT6:00 amOntario
30h 13m
1 stop
MKE2:13 pmMilwaukee-Mitchell
May 6
MKE7:00 amMilwaukee-Mitchell
28h 45m
1 stop
ONT9:45 amOntario
$343
Alaska Airlines
May 1
ONT7:59 pmOntario
16h 44m
1 stop
MKE2:43 pmMilwaukee-Mitchell
May 3
MKE3:09 pmMilwaukee-Mitchell
20h 36m
1 stop
ONT9:45 amOntario
$383
Alaska Airlines
May 8
ONT7:59 pmOntario
16h 44m
1 stop
MKE2:43 pmMilwaukee-Mitchell
May 28
MKE4:40 pmMilwaukee-Mitchell
9h 18m
1 stop
ONT11:58 pmOntario
$390

United Airlines flights from Ontario to Milwaukee

Our best United Airlines deals on Ontario to Milwaukee flight tickets
United Airlines
Jun 2
ONT5:00 amOntario
10h 53m
2 stops
MKE5:53 pmMilwaukee-Mitchell
Jun 9
MKE5:29 pmMilwaukee-Mitchell
7h 17m
1 stop
ONT10:46 pmOntario
$362
United Airlines
May 7
ONT7:00 amOntario
7h 42m
1 stop
MKE4:42 pmMilwaukee-Mitchell
May 16
MKE2:38 pmMilwaukee-Mitchell
7h 58m
1 stop
ONT8:36 pmOntario
$427
United Airlines
Apr 16
ONT1:34 pmOntario
6h 58m
1 stop
MKE10:32 pmMilwaukee-Mitchell
Apr 20
MKE4:13 pmMilwaukee-Mitchell
6h 23m
1 stop
ONT8:36 pmOntario
$447

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 March 10, 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 - MKE

ONTMKE

Ontario

Thu 4/16

5:33 pm-5:44 pm

1 stop22h 11m

Milwaukee-Mitchell

Mon 4/20

5:05 pm-11:55 pm

1 stop8h 50m

$201

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Thu 4/16

5:33 pm-5:44 pm

1 stop22h 11m

Milwaukee-Mitchell

Mon 4/20

5:05 pm-11:55 pm

1 stop8h 50m

$221

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Thu 4/23

12:59 am-5:34 pm

1 stop14h 35m

Milwaukee-Mitchell

Mon 4/27

5:05 pm-11:55 pm

1 stop8h 50m

$222

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Wed 4/1

4:52 pm-12:02 pm

1 stop17h 10m

Milwaukee-Mitchell

Sun 4/5

2:00 pm-8:04 am

1 stop20h 04m

$251

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Tue 4/7

10:25 pm-9:04 am

1 stop8h 39m

Milwaukee-Mitchell

Tue 4/14

12:33 pm-9:00 pm

1 stop10h 27m

$317

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Thu 4/16

7:08 pm-10:43 am

2 stops13h 35m

Milwaukee-Mitchell

Mon 4/20

5:05 pm-11:55 pm

1 stop8h 50m

$329

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Thu 4/30

12:49 pm-11:57 pm

1 stop9h 08m

Milwaukee-Mitchell

Tue 5/5

7:25 am-12:14 pm

1 stop6h 49m

$337
Quickest round-trip

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Tue 5/26

3:45 pm-11:10 pm

1 stop5h 25m

Milwaukee-Mitchell

Tue 6/9

4:10 pm-10:45 pm

2 stops8h 35m

$342

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Tue 4/28

6:00 am-2:13 pm

1 stop30h 13m

Milwaukee-Mitchell

Wed 5/6

7:00 am-9:45 am

1 stop28h 45m

$343

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Fri 4/17

5:55 pm-8:49 am

2 stops12h 54m

Milwaukee-Mitchell

Mon 4/20

7:25 am-12:14 pm

1 stop6h 49m

$355

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 $375.

How have Ontario to Milwaukee flight prices changed over time?

As of March 2026, prices for Ontario to Milwaukee flights are approximately 39% 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 31m

Direct flights

None
The fastest flight from Ontario to Milwaukee takes 5h 31m
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 31m, 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
8,276 reviews
Search Delta flights
American AirlinesPriceFrom $276Free CancellationRating
7.1
11,414 reviews
Search American Airlines flights
United AirlinesPriceFrom $309Free CancellationRating
7.4
9,409 reviews
Search United Airlines flights
SouthwestPriceFrom $326Free CancellationRating
8.0
4,317 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
West Bend
Port Washington
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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