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, American Airlines, and United 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.

$114 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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Cheap round-trip flights

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6:22 am - 3:08 pm

ONT

MKE

6h 46m1 stop

12:07 pm - 6:45 pm

MKE

ONT

8h 38m1 stop

$193American Airlines

Wed, Jan 14 - Tue, Jan 20

6:22 am - 5:05 pm

ONT

MKE

8h 43m2 stops

12:07 pm - 6:45 pm

MKE

ONT

8h 38m1 stop

$198American Airlines

Wed, Jan 14 - Tue, Jan 20

7:10 am - 4:57 pm

ONT

MKE

7h 47m1 stop

6:22 am - 1:56 pm

MKE

ONT

9h 34m1 stop

$222American Airlines

Wed, Feb 18 - Sat, Feb 21

6:05 am - 4:10 pm

ONT

MKE

8h 05m2 stops

5:10 am - 12:25 pm

MKE

ONT

9h 15m2 stops

$223Southwest

Wed, Jan 14 - Tue, Jan 20

12:27 pm - 9:53 pm

ONT

MKE

7h 26m2 stops

11:52 am - 6:39 pm

MKE

ONT

8h 47m1 stop

$227American Airlines

Wed, Feb 18 - Sat, Feb 21

7:10 am - 4:57 pm

ONT

MKE

7h 47m1 stop

6:22 am - 4:26 pm

MKE

ONT

12h 04m2 stops

$241American Airlines

Wed, Feb 18 - Sat, Feb 21

12:27 pm - 9:53 pm

ONT

MKE

7h 26m2 stops

6:22 am - 4:26 pm

MKE

ONT

12h 04m2 stops

$255American Airlines

Wed, Feb 18 - Sat, Feb 21

1:10 pm - 9:15 pm

ONT

MKE

6h 05m1 stop

2:45 pm - 9:05 pm

MKE

ONT

8h 20m1 stop

$277Delta

Wed, Jan 21 - Sat, Jan 31

12:27 pm - 9:53 pm

ONT

MKE

7h 26m2 stops

6:22 am - 4:26 pm

MKE

ONT

12h 04m2 stops

$296American Airlines

Wed, Feb 18 - Sat, Feb 21

4:03 pm - 2:57 pm

ONT

MKE

20h 54m1 stop

3:53 pm - 3:08 pm

MKE

ONT

25h 15m1 stop

$302Alaska Airlines

Thu, Jan 22 - Mon, Jan 26

Delta flights from Ontario to Milwaukee

Our best Delta deals on Ontario to Milwaukee flight tickets

Delta

Jan 21

ONT1:10 pmOntario

6h 05m

1 stop

MKE9:15 pmMilwaukee-Mitchell

Jan 31

MKE2:45 pmMilwaukee-Mitchell

8h 20m

1 stop

ONT9:05 pmOntario

$277

Find similar

Delta

Dec 24

ONT7:05 amOntario

8h 54m

1 stop

MKE5:59 pmMilwaukee-Mitchell

Jan 7

MKE5:30 amMilwaukee-Mitchell

8h 01m

1 stop

ONT11:31 amOntario

$307

Find similar

Delta

Feb 8

ONT10:30 pmOntario

8h 46m

1 stop

MKE9:16 amMilwaukee-Mitchell

Feb 15

MKE5:23 amMilwaukee-Mitchell

8h 39m

1 stop

ONT12:02 pmOntario

$359

Find similar

American Airlines flights from Ontario to Milwaukee

Our best American Airlines deals on Ontario to Milwaukee flight tickets

American Airlines

Jan 14

ONT6:22 amOntario

6h 46m

1 stop

MKE3:08 pmMilwaukee-Mitchell

Jan 20

MKE12:07 pmMilwaukee-Mitchell

8h 38m

1 stop

ONT6:45 pmOntario

$193

Find similar

American Airlines

Jan 14

ONT6:22 amOntario

8h 43m

2 stops

MKE5:05 pmMilwaukee-Mitchell

Jan 20

MKE12:07 pmMilwaukee-Mitchell

8h 38m

1 stop

ONT6:45 pmOntario

$198

Find similar

American Airlines

Feb 18

ONT7:10 amOntario

7h 47m

1 stop

MKE4:57 pmMilwaukee-Mitchell

Feb 21

MKE6:22 amMilwaukee-Mitchell

9h 34m

1 stop

ONT1:56 pmOntario

$222

Find similar

Fly from

Fly to

Route

Depart

Return

Price

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Wed 1/14

6:22 am-3:08 pm

1 stop6h 46m

Milwaukee-Mitchell

Tue 1/20

12:07 pm-6:45 pm

1 stop8h 38m

$193

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Wed 1/14

6:22 am-5:05 pm

2 stops8h 43m

Milwaukee-Mitchell

Tue 1/20

12:07 pm-6:45 pm

1 stop8h 38m

$198

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Wed 2/18

7:10 am-4:57 pm

1 stop7h 47m

Milwaukee-Mitchell

Sat 2/21

6:22 am-1:56 pm

1 stop9h 34m

$222

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Wed 1/14

6:05 am-4:10 pm

2 stops8h 05m

Milwaukee-Mitchell

Tue 1/20

5:10 am-12:25 pm

2 stops9h 15m

$223

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Wed 2/18

12:27 pm-9:53 pm

2 stops7h 26m

Milwaukee-Mitchell

Sat 2/21

11:52 am-6:39 pm

1 stop8h 47m

$227

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Wed 2/18

7:10 am-4:57 pm

1 stop7h 47m

Milwaukee-Mitchell

Sat 2/21

6:22 am-4:26 pm

2 stops12h 04m

$241

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Wed 2/18

12:27 pm-9:53 pm

2 stops7h 26m

Milwaukee-Mitchell

Sat 2/21

6:22 am-4:26 pm

2 stops12h 04m

$255

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Wed 1/21

1:10 pm-9:15 pm

1 stop6h 05m

Milwaukee-Mitchell

Sat 1/31

2:45 pm-9:05 pm

1 stop8h 20m

$277

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Wed 2/18

12:27 pm-9:53 pm

2 stops7h 26m

Milwaukee-Mitchell

Sat 2/21

6:22 am-4:26 pm

2 stops12h 04m

$296

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Thu 1/22

4:03 pm-2:57 pm

1 stop20h 54m

Milwaukee-Mitchell

Mon 1/26

3:53 pm-3:08 pm

1 stop25h 15m

$302

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.

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

In the morning is the cheapest time of day to fly from Ontario to Milwaukee when you can find flight prices for as low as $180. Flying to Milwaukee in the morning is an ideal time because this is during off-peak travel hours. In the afternoon is when there is more demand to fly to Milwaukee, so prices are often more expensive at around $463 per ticket.

How have Ontario to Milwaukee flight prices changed over time?

As of December 2025, prices for Ontario to Milwaukee flights are approximately 122% 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 30m
Direct flights	None

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

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 05m, 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 28%, 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 8,011 reviews	Search Delta flights
American Airlines	PriceFrom $276	Free Cancellation	Rating 7.2 11,047 reviews	Search American Airlines flights
United Airlines	PriceFrom $309	Free Cancellation	Rating 7.4 9,066 reviews	Search United Airlines flights
Southwest	PriceFrom $330	Free Cancellation	Rating 8.0 4,250 reviews	Search Southwest flights

Sheboygan

Waukesha

Wauwatosa

Oak Creek

Mequon

Glendale

Kohler

Pewaukee

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.