What airlines fly to Milwaukee?

American Airlines, United Airlines and Spirit Airlines are the top three most popular airlines that fly to Milwaukee from Ontario according to our data. American Airlines is the first choice among our users, with 42% of people opting to fly with this airline when traveling to Milwaukee. Keep in mind that there are 9 different airlines that fly to Milwaukee on a routine basis, so you have a few additional options to choose from.

What is the cheapest airline that flies from Ontario to Milwaukee-Mitchell?

Delta and American Airlines are the most popular carriers operating from Ontario to Milwaukee-Mitchell

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?

As of December 2025, there are 4 operators available to choose from 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.

$168 Cheap Flights from Ontario to Milwaukee in 2025/26

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Find the cheapest flights from Ontario to Milwaukee

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One-way

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Cheap round-trip flights

Enter your travel dates to find the best prices.

6:14 am - 2:51 pm

ONT

MKE

30h 37m1 stop

3:10 pm - 11:59 pm

MKE

ONT

10h 49m1 stop

$284Alaska Airlines

Tue, Mar 3 - Wed, Mar 18

4:02 pm - 2:51 pm

ONT

MKE

20h 49m1 stop

3:47 pm - 10:44 pm

MKE

ONT

8h 57m1 stop

$294Alaska Airlines

Sat, Feb 14 - Wed, Feb 18

11:53 am - 2:57 pm

ONT

MKE

25h 04m1 stop

4:03 pm - 10:59 am

MKE

ONT

20h 56m1 stop

$324Alaska Airlines

Wed, Feb 4 - Sun, Feb 8

7:59 pm - 2:51 pm

ONT

MKE

16h 52m2 stops

3:10 pm - 11:59 pm

MKE

ONT

10h 49m1 stop

$333Alaska Airlines

Tue, Mar 3 - Wed, Mar 18

1:15 pm - 11:47 pm

ONT

MKE

8h 32m1 stop

7:30 am - 12:07 pm

MKE

ONT

6h 37m1 stop

$334Delta

Wed, Feb 18 - Sat, Feb 21

7:30 am - 9:15 pm

ONT

MKE

11h 45m2 stops

7:45 am - 12:16 pm

MKE

ONT

6h 31m1 stop

$336Delta

Sat, Jan 24 - Sat, Jan 31

5:05 am - 2:22 pm

ONT

MKE

7h 17m1 stop

4:05 pm - 8:58 pm

MKE

ONT

6h 53m1 stop

$337United Airlines

Mon, Jan 26 - Mon, Feb 2

6:13 am - 4:57 pm

ONT

MKE

8h 44m2 stops

3:05 pm - 10:49 pm

MKE

ONT

9h 44m1 stop

$339American Airlines

Wed, Feb 18 - Sat, Feb 21

5:05 am - 2:22 pm

ONT

MKE

7h 17m1 stop

2:32 pm - 10:53 pm

MKE

ONT

10h 21m2 stops

$342United Airlines

Mon, Jan 26 - Mon, Feb 2

6:13 am - 4:57 pm

ONT

MKE

8h 44m2 stops

9:43 am - 7:00 pm

MKE

ONT

11h 17m2 stops

$344American Airlines

Wed, Feb 18 - Sat, Feb 21

American Airlines flights from Ontario to Milwaukee

Our best American Airlines deals on Ontario to Milwaukee flight tickets

American Airlines

Feb 18

ONT12:28 pmOntario

7h 15m

1 stop

MKE9:43 pmMilwaukee-Mitchell

Feb 21

MKE9:43 amMilwaukee-Mitchell

11h 17m

2 stops

ONT7:00 pmOntario

$339

Find similar

American Airlines

Feb 18

ONT6:13 amOntario

8h 44m

2 stops

MKE4:57 pmMilwaukee-Mitchell

Feb 21

MKE9:43 amMilwaukee-Mitchell

11h 17m

2 stops

ONT7:00 pmOntario

$344

Find similar

American Airlines

May 30

ONT10:54 amOntario

7h 55m

1 stop

MKE8:49 pmMilwaukee-Mitchell

Jun 6

MKE11:27 amMilwaukee-Mitchell

8h 20m

2 stops

ONT5:47 pmOntario

$492

Find similar

United Airlines flights from Ontario to Milwaukee

Our best United Airlines deals on Ontario to Milwaukee flight tickets

United Airlines

Jan 26

ONT5:05 amOntario

7h 17m

1 stop

MKE2:22 pmMilwaukee-Mitchell

Feb 2

MKE4:05 pmMilwaukee-Mitchell

6h 53m

1 stop

ONT8:58 pmOntario

$337

Find similar

United Airlines

Jan 26

ONT5:05 amOntario

7h 17m

1 stop

MKE2:22 pmMilwaukee-Mitchell

Feb 2

MKE2:32 pmMilwaukee-Mitchell

10h 21m

2 stops

ONT10:53 pmOntario

$342

Find similar

United Airlines

Jan 24

ONT5:05 amOntario

8h 38m

2 stops

MKE3:43 pmMilwaukee-Mitchell

Jan 31

MKE11:30 amMilwaukee-Mitchell

11h 28m

2 stops

ONT8:58 pmOntario

$347

Find similar

Fly from

Fly to

Route

Depart

Return

Price

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Tue 3/3

6:14 am-2:51 pm

1 stop30h 37m

Milwaukee-Mitchell

Wed 3/18

3:10 pm-11:59 pm

1 stop10h 49m

$284

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Sat 2/14

4:02 pm-2:51 pm

1 stop20h 49m

Milwaukee-Mitchell

Wed 2/18

3:47 pm-10:44 pm

1 stop8h 57m

$294

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Wed 2/4

11:53 am-2:57 pm

1 stop25h 04m

Milwaukee-Mitchell

Sun 2/8

4:03 pm-10:59 am

1 stop20h 56m

$324

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Tue 3/3

7:59 pm-2:51 pm

2 stops16h 52m

Milwaukee-Mitchell

Wed 3/18

3:10 pm-11:59 pm

1 stop10h 49m

$333

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Wed 2/18

1:15 pm-11:47 pm

1 stop8h 32m

Milwaukee-Mitchell

Sat 2/21

7:30 am-12:07 pm

1 stop6h 37m

$334

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Sat 1/24

7:30 am-9:15 pm

2 stops11h 45m

Milwaukee-Mitchell

Sat 1/31

7:45 am-12:16 pm

1 stop6h 31m

$336

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Mon 1/26

5:05 am-2:22 pm

1 stop7h 17m

Milwaukee-Mitchell

Mon 2/2

4:05 pm-8:58 pm

1 stop6h 53m

$337

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Wed 2/18

6:13 am-4:57 pm

2 stops8h 44m

Milwaukee-Mitchell

Sat 2/21

3:05 pm-10:49 pm

1 stop9h 44m

$339

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Mon 1/26

5:05 am-2:22 pm

1 stop7h 17m

Milwaukee-Mitchell

Mon 2/2

2:32 pm-10:53 pm

2 stops10h 21m

$342

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Wed 2/18

6:13 am-4:57 pm

2 stops8h 44m

Milwaukee-Mitchell

Sat 2/21

9:43 am-7:00 pm

2 stops11h 17m

$344

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

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

Prices

Airlines

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.

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 Saturday will generally be more expensive and average around $408. 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 December 2025, prices for Ontario to Milwaukee flights are approximately 124% 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 50m
Direct flights	None

The fastest flight from Ontario to Milwaukee takes 5h 50m

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 50m, 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?
As of December 2025, there are 4 operators available to choose from 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?
momondo data reveals that the most frequently booked airline on the route from Ontario to Milwaukee is Southwest, representing 55% of all bookings. The subsequent popular airlines are American Airlines at 27%, United Airlines at 12%, and Delta at 6%.

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
Delta	PriceFrom $253	Free Cancellation	Rating 7.9 8,019 reviews	Search Delta flights
American Airlines	PriceFrom $276	Free Cancellation	Rating 7.2 11,073 reviews	Search American Airlines flights
United Airlines	PriceFrom $309	Free Cancellation	Rating 7.4 9,113 reviews	Search United Airlines flights
Southwest	PriceFrom $330	Free Cancellation	Rating 8.0 4,256 reviews	Search Southwest flights

Sheboygan

Waukesha

Wauwatosa

Oak Creek

Mequon

Pewaukee

Glendale

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.