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

Delta, United Airlines, and Alaska Airlines are the most popular carriers operating from Ontario to Milwaukee-Mitchell

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 10 different airlines that fly to Milwaukee on a routine basis, so you have a few additional options to choose from.

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 January 2026, 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.

$158 Cheap Flights from Ontario to Milwaukee in 2026

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Find the cheapest flights from Ontario to Milwaukee

Round-trip

One-way

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Cheap round-trip flights

Enter your travel dates to find the best prices.

1:20 pm - 9:21 pm

ONT

MKE

6h 01m

1 stop

10:25 am - 6:15 pm

MKE

ONT

9h 50m

1 stop

$315Delta

Fri, May 1 - Tue, May 12

12:18 pm - 10:57 pm

ONT

MKE

8h 39m

2 stops

11:49 am - 6:42 pm

MKE

ONT

8h 53m

1 stop

$320American Airlines

Wed, Feb 18 - Sat, Feb 21

7:59 pm - 7:49 am

ONT

MKE

9h 50m

2 stops

9:15 am - 6:24 pm

MKE

ONT

11h 09m

2 stops

$326American Airlines

Wed, Apr 1 - Wed, Apr 8

6:14 am - 2:51 pm

ONT

MKE

30h 37m

1 stop

3:47 pm - 10:44 pm

MKE

ONT

8h 57m

1 stop

$333Alaska Airlines

Wed, Feb 18 - Wed, Feb 25

7:35 pm - 7:45 am

ONT

MKE

10h 10m

2 stops

11:55 am - 6:37 pm

MKE

ONT

8h 42m

1 stop

$336American Airlines

Fri, May 1 - Tue, May 12

10:30 pm - 9:16 am

ONT

MKE

8h 46m

1 stop

5:30 am - 11:31 am

MKE

ONT

8h 01m

1 stop

$339Delta

Mon, Feb 2 - Wed, Feb 4

5:00 am - 2:57 pm

ONT

MKE

7h 57m

1 stop

5:00 am - 12:43 pm

MKE

ONT

9h 43m

2 stops

$340United Airlines

Fri, Feb 20 - Sun, Feb 22

7:35 pm - 7:45 am

ONT

MKE

10h 10m

2 stops

8:15 am - 6:24 pm

MKE

ONT

12h 09m

2 stops

$341American Airlines

Fri, May 1 - Tue, May 12

1:20 pm - 9:15 pm

ONT

MKE

5h 55m

1 stop

7:35 am - 12:23 pm

MKE

ONT

6h 48m

1 stop

$343Delta

Wed, Apr 8 - Sun, Apr 12

1:15 pm - 11:47 pm

ONT

MKE

8h 32m

1 stop

5:23 am - 12:02 pm

MKE

ONT

8h 39m

1 stop

$347Delta

Fri, Feb 20 - Sun, Feb 22

Delta flights from Ontario to Milwaukee

Our best Delta deals on Ontario to Milwaukee flight tickets

Delta

May 1

ONT1:20 pmOntario

6h 01m

1 stop

MKE9:21 pmMilwaukee-Mitchell

May 12

MKE10:25 amMilwaukee-Mitchell

9h 50m

1 stop

ONT6:15 pmOntario

$315

Delta

Feb 2

ONT10:30 pmOntario

8h 46m

1 stop

MKE9:16 amMilwaukee-Mitchell

Feb 4

MKE5:30 amMilwaukee-Mitchell

8h 01m

1 stop

ONT11:31 amOntario

$339

Delta

Apr 8

ONT1:20 pmOntario

5h 55m

1 stop

MKE9:15 pmMilwaukee-Mitchell

Apr 12

MKE7:35 amMilwaukee-Mitchell

6h 48m

1 stop

ONT12:23 pmOntario

$343

Alaska Airlines flights from Ontario to Milwaukee

Our best Alaska Airlines deals on Ontario to Milwaukee flight tickets

Alaska Airlines

Feb 18

ONT6:14 amOntario

30h 37m

1 stop

MKE2:51 pmMilwaukee-Mitchell

Feb 25

MKE3:47 pmMilwaukee-Mitchell

8h 57m

1 stop

ONT10:44 pmOntario

$333

Alaska Airlines

May 14

ONT4:03 pmOntario

29h 54m

1 stop

MKE11:57 pmMilwaukee-Mitchell

May 18

MKE7:00 amMilwaukee-Mitchell

30h 07m

1 stop

ONT11:07 amOntario

$353

Alaska Airlines

Feb 14

ONT4:02 pmOntario

20h 49m

1 stop

MKE2:51 pmMilwaukee-Mitchell

Feb 18

MKE3:47 pmMilwaukee-Mitchell

8h 57m

1 stop

ONT10:44 pmOntario

$373

Fly from

Fly to

Route

Depart

Return

Price

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Fri 5/1

1:20 pm-9:21 pm

1 stop6h 01m

Milwaukee-Mitchell

Tue 5/12

10:25 am-6:15 pm

1 stop9h 50m

$315

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Wed 2/18

12:18 pm-10:57 pm

2 stops8h 39m

Milwaukee-Mitchell

Sat 2/21

11:49 am-6:42 pm

1 stop8h 53m

$320

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Wed 4/1

7:59 pm-7:49 am

2 stops9h 50m

Milwaukee-Mitchell

Wed 4/8

9:15 am-6:24 pm

2 stops11h 09m

$326

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Wed 2/18

6:14 am-2:51 pm

1 stop30h 37m

Milwaukee-Mitchell

Wed 2/25

3:47 pm-10:44 pm

1 stop8h 57m

$333

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Fri 5/1

7:35 pm-7:45 am

2 stops10h 10m

Milwaukee-Mitchell

Tue 5/12

11:55 am-6:37 pm

1 stop8h 42m

$336

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Mon 2/2

10:30 pm-9:16 am

1 stop8h 46m

Milwaukee-Mitchell

Wed 2/4

5:30 am-11:31 am

1 stop8h 01m

$339

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Fri 2/20

5:00 am-2:57 pm

1 stop7h 57m

Milwaukee-Mitchell

Sun 2/22

5:00 am-12:43 pm

2 stops9h 43m

$340

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Fri 5/1

7:35 pm-7:45 am

2 stops10h 10m

Milwaukee-Mitchell

Tue 5/12

8:15 am-6:24 pm

2 stops12h 09m

$341

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Wed 4/8

1:20 pm-9:15 pm

1 stop5h 55m

Milwaukee-Mitchell

Sun 4/12

7:35 am-12:23 pm

1 stop6h 48m

$343

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Fri 2/20

1:15 pm-11:47 pm

1 stop8h 32m

Milwaukee-Mitchell

Sun 2/22

5:23 am-12:02 pm

1 stop8h 39m

$347

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 $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 far in advance should I book a flight to Milwaukee?

You are more likely to see cheaper flights to Milwaukee from Ontario when booking weeks ahead of your departure date. In general, you can expect to find flights to Milwaukee for around $454 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Milwaukee from Ontario for as low as $305 on momondo.

How have Ontario to Milwaukee flight prices changed over time?

As of January 2026, prices for Ontario to Milwaukee flights are approximately 78% cheaper 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 48m
Direct flights	None

The fastest flight from Ontario to Milwaukee takes 5h 48m

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 48m, 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 January 2026, 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 26%, United Airlines at 13%, 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 8,076 reviews	Search Delta flights
American Airlines	PriceFrom $276	Free Cancellation	Rating 7.2 11,164 reviews	Search American Airlines flights
United Airlines	PriceFrom $309	Free Cancellation	Rating 7.4 9,180 reviews	Search United Airlines flights
Southwest	PriceFrom $330	Free Cancellation	Rating 8.0 4,267 reviews	Search Southwest flights

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.