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 Frontier 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 November 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.

$154 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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11:53 am - 2:57 pmONT-MKE

25h 04m1 stop

3:53 pm - 3:08 pmMKE-ONT

25h 15m1 stop

$324Alaska Airlines

Find Deal

Thu, Jan 8 - Mon, Jan 12

5:05 am - 3:00 pmONT-MKE

7h 55m1 stop

4:11 pm - 9:08 pmMKE-ONT

6h 57m1 stop

$387United Airlines

Find Deal

Thu, Jan 1 - Mon, Jan 5

5:05 am - 3:00 pmONT-MKE

7h 55m1 stop

12:02 pm - 9:08 pmMKE-ONT

11h 06m2 stops

$392United Airlines

Find Deal

Thu, Jan 1 - Mon, Jan 5

5:05 am - 2:22 pmONT-MKE

7h 17m1 stop

4:05 pm - 8:58 pmMKE-ONT

6h 53m1 stop

$397United Airlines

Find Deal

Mon, Feb 2 - Mon, Feb 9

6:00 am - 2:09 pmONT-MKE

30h 09m1 stop

3:05 pm - 6:25 pmMKE-ONT

29h 20m1 stop

$398Alaska Airlines

Find Deal

Thu, Jan 1 - Mon, Jan 5

6:22 am - 5:05 pmONT-MKE

8h 43m2 stops

7:10 am - 12:03 pmMKE-ONT

6h 53m1 stop

$402American Airlines

Find Deal

Thu, Jan 8 - Mon, Jan 12

7:10 am - 5:01 pmONT-MKE

7h 51m1 stop

3:13 pm - 10:14 pmMKE-ONT

9h 01m1 stop

$404American Airlines

Find Deal

Thu, Dec 18 - Mon, Dec 22

5:05 am - 3:43 pmONT-MKE

8h 38m2 stops

11:30 am - 9:58 pmMKE-ONT

12h 28m2 stops

$407United Airlines

Find Deal

Thu, Jan 8 - Mon, Jan 12

12:55 pm - 11:58 pmONT-MKE

9h 03m2 stops

3:13 pm - 10:14 pmMKE-ONT

9h 01m1 stop

$409American Airlines

Find Deal

Thu, Dec 18 - Mon, Dec 22

11:59 pm - 11:03 amONT-MKE

9h 04m1 stop

12:07 pm - 5:22 pmMKE-ONT

7h 15m1 stop

$410American Airlines

Find Deal

Sat, Dec 27 - Fri, Jan 9

Alaska Airlines flights from Ontario to Milwaukee

Our best Alaska Airlines deals on Ontario to Milwaukee flight tickets

Alaska Airlines

Jan 8

ONT11:53 amOntario

25h 04m

1 stop

MKE2:57 pmMilwaukee-Mitchell

Jan 12

MKE3:53 pmMilwaukee-Mitchell

25h 15m

1 stop

ONT3:08 pmOntario

$324

Find similar

Alaska Airlines

Jan 1

ONT6:00 amOntario

30h 09m

1 stop

MKE2:09 pmMilwaukee-Mitchell

Jan 5

MKE3:05 pmMilwaukee-Mitchell

29h 20m

1 stop

ONT6:25 pmOntario

$398

Find similar

Alaska Airlines

Feb 2

ONT6:00 amOntario

14h 02m

2 stops

MKE10:02 pmMilwaukee-Mitchell

Feb 9

MKE3:53 pmMilwaukee-Mitchell

10h 03m

1 stop

ONT11:56 pmOntario

$508

Find similar

American Airlines flights from Ontario to Milwaukee

Our best American Airlines deals on Ontario to Milwaukee flight tickets

American Airlines

Jan 8

ONT6:22 amOntario

8h 43m

2 stops

MKE5:05 pmMilwaukee-Mitchell

Jan 12

MKE7:10 amMilwaukee-Mitchell

6h 53m

1 stop

ONT12:03 pmOntario

$402

Find similar

American Airlines

Dec 18

ONT7:10 amOntario

7h 51m

1 stop

MKE5:01 pmMilwaukee-Mitchell

Dec 22

MKE3:13 pmMilwaukee-Mitchell

9h 01m

1 stop

ONT10:14 pmOntario

$404

Find similar

American Airlines

Dec 18

ONT12:55 pmOntario

9h 03m

2 stops

MKE11:58 pmMilwaukee-Mitchell

Dec 22

MKE3:13 pmMilwaukee-Mitchell

9h 01m

1 stop

ONT10:14 pmOntario

$409

Find similar

Fly from

Fly to

Route

Depart

Return

Price

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Thu 1/8

11:53 am-2:57 pm

1 stop25h 04m

Milwaukee-Mitchell

Mon 1/12

3:53 pm-3:08 pm

1 stop25h 15m

$324

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Thu 1/1

5:05 am-3:00 pm

1 stop7h 55m

Milwaukee-Mitchell

Mon 1/5

4:11 pm-9:08 pm

1 stop6h 57m

$387

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Thu 1/1

5:05 am-3:00 pm

1 stop7h 55m

Milwaukee-Mitchell

Mon 1/5

12:02 pm-9:08 pm

2 stops11h 06m

$392

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Mon 2/2

5:05 am-2:22 pm

1 stop7h 17m

Milwaukee-Mitchell

Mon 2/9

4:05 pm-8:58 pm

1 stop6h 53m

$397

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Thu 1/1

6:00 am-2:09 pm

1 stop30h 09m

Milwaukee-Mitchell

Mon 1/5

3:05 pm-6:25 pm

1 stop29h 20m

$398

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Thu 1/8

6:22 am-5:05 pm

2 stops8h 43m

Milwaukee-Mitchell

Mon 1/12

7:10 am-12:03 pm

1 stop6h 53m

$402

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Thu 12/18

7:10 am-5:01 pm

1 stop7h 51m

Milwaukee-Mitchell

Mon 12/22

3:13 pm-10:14 pm

1 stop9h 01m

$404

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Thu 1/8

5:05 am-3:43 pm

2 stops8h 38m

Milwaukee-Mitchell

Mon 1/12

11:30 am-9:58 pm

2 stops12h 28m

$407

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Thu 12/18

12:55 pm-11:58 pm

2 stops9h 03m

Milwaukee-Mitchell

Mon 12/22

3:13 pm-10:14 pm

1 stop9h 01m

$409

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Sat 12/27

11:59 pm-11:03 am

1 stop9h 04m

Milwaukee-Mitchell

Fri 1/9

12:07 pm-5:22 pm

1 stop7h 15m

$410

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 November 2025, prices for Ontario to Milwaukee flights are approximately 89% 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 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?
As of November 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 7,999 reviews	Search Delta flights
American Airlines	PriceFrom $276	Free Cancellation	Rating 7.2 11,038 reviews	Search American Airlines flights
United Airlines	PriceFrom $309	Free Cancellation	Rating 7.4 9,046 reviews	Search United Airlines flights
Southwest	PriceFrom $330	Free Cancellation	Rating 8.0 4,254 reviews	Search Southwest flights

Sheboygan

Waukesha

Wauwatosa

Oak Creek

Mequon

Glendale

Kohler

Pewaukee

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.