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.

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

Frontier, Delta, and Southwest 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 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.

$115 Cheap Flights from Ontario to Milwaukee in 2026

Q: What is the typical price of a round-trip flight between Ontario and Milwaukee?

Prices are currently low for flights on this route. Typical prices usually range from $333 to $636. The lowest price recently found on this route was $229.

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Find the cheapest flights from Ontario to Milwaukee

Round-trip

One-way

Last minute

Cheap round-trip flights

Enter your travel dates to find the best prices.

2:08 pm - 6:51 pm

ONT

MKE

26h 43m

1 stop

7:46 pm - 11:59 pm

MKE

ONT

6h 13m

1 stop

$229Frontier

Thu, Mar 5 - Mon, Mar 9

12:59 am - 6:59 pm

ONT

MKE

16h 00m

1 stop

7:37 pm - 11:55 pm

MKE

ONT

6h 18m

1 stop

$246Frontier

Sun, Apr 19 - Fri, Apr 24

6:15 am - 6:51 pm

ONT

MKE

10h 36m

1 stop

7:46 pm - 11:59 pm

MKE

ONT

6h 13m

1 stop

$268Frontier

Fri, Mar 6 - Mon, Mar 9

5:33 pm - 6:59 pm

ONT

MKE

23h 26m

1 stop

7:37 pm - 11:55 pm

MKE

ONT

6h 18m

1 stop

$272Frontier

Thu, Apr 30 - Mon, May 4

6:15 am - 1:58 pm

ONT

MKE

5h 43m

1 stop

7:16 am - 4:22 pm

MKE

ONT

11h 06m

1 stop

$326American Airlines

Wed, Feb 18 - Sat, Feb 21

12:18 pm - 10:57 pm

ONT

MKE

8h 39m

2 stops

7:16 am - 4:22 pm

MKE

ONT

11h 06m

1 stop

$331American Airlines

Wed, Feb 18 - Sat, Feb 21

7:08 pm - 2:14 pm

ONT

MKE

17h 06m

1 stop

3:10 pm - 9:39 am

MKE

ONT

20h 29m

1 stop

$333Alaska Airlines

Wed, Apr 8 - Tue, Apr 14

11:58 pm - 11:01 am

ONT

MKE

9h 03m

1 stop

3:11 pm - 10:49 pm

MKE

ONT

9h 38m

1 stop

$337American Airlines

Wed, Feb 18 - Sat, Feb 21

10:20 pm - 9:09 am

ONT

MKE

8h 49m

1 stop

5:25 am - 12:02 pm

MKE

ONT

8h 37m

1 stop

$338Delta

Sun, Feb 15 - Tue, Feb 24

1:11 pm - 9:15 pm

ONT

MKE

6h 04m

1 stop

2:20 pm - 9:05 pm

MKE

ONT

8h 45m

1 stop

$339Delta

Tue, Feb 10 - Sat, Feb 14

Frontier flights from Ontario to Milwaukee

Our best Frontier deals on Ontario to Milwaukee flight tickets

Frontier

Mar 5

ONT2:08 pmOntario

26h 43m

1 stop

MKE6:51 pmMilwaukee-Mitchell

Mar 9

MKE7:46 pmMilwaukee-Mitchell

6h 13m

1 stop

ONT11:59 pmOntario

$229

Frontier

Apr 19

ONT12:59 amOntario

16h 00m

1 stop

MKE6:59 pmMilwaukee-Mitchell

Apr 24

MKE7:37 pmMilwaukee-Mitchell

6h 18m

1 stop

ONT11:55 pmOntario

$246

Frontier

Mar 6

ONT6:15 amOntario

10h 36m

1 stop

MKE6:51 pmMilwaukee-Mitchell

Mar 9

MKE7:46 pmMilwaukee-Mitchell

6h 13m

1 stop

ONT11:59 pmOntario

$268

American Airlines flights from Ontario to Milwaukee

Our best American Airlines deals on Ontario to Milwaukee flight tickets

American Airlines

Feb 24

ONT9:53 amOntario

11h 04m

2 stops

MKE10:57 pmMilwaukee-Mitchell

Feb 28

MKE3:11 pmMilwaukee-Mitchell

9h 38m

1 stop

ONT10:49 pmOntario

$321

American Airlines

Feb 18

ONT6:15 amOntario

5h 43m

1 stop

MKE1:58 pmMilwaukee-Mitchell

Feb 21

MKE7:16 amMilwaukee-Mitchell

11h 06m

1 stop

ONT4:22 pmOntario

$326

American Airlines

Feb 18

ONT12:18 pmOntario

8h 39m

2 stops

MKE10:57 pmMilwaukee-Mitchell

Feb 21

MKE7:16 amMilwaukee-Mitchell

11h 06m

1 stop

ONT4:22 pmOntario

$331

Fly from

Fly to

Route

Depart

Return

Price

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Thu 3/5

2:08 pm-6:51 pm

1 stop26h 43m

Milwaukee-Mitchell

Mon 3/9

7:46 pm-11:59 pm

1 stop6h 13m

$229

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Sun 4/19

12:59 am-6:59 pm

1 stop16h 00m

Milwaukee-Mitchell

Fri 4/24

7:37 pm-11:55 pm

1 stop6h 18m

$246

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Fri 3/6

6:15 am-6:51 pm

1 stop10h 36m

Milwaukee-Mitchell

Mon 3/9

7:46 pm-11:59 pm

1 stop6h 13m

$268

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Thu 4/30

5:33 pm-6:59 pm

1 stop23h 26m

Milwaukee-Mitchell

Mon 5/4

7:37 pm-11:55 pm

1 stop6h 18m

$272

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Wed 2/18

6:15 am-1:58 pm

1 stop5h 43m

Milwaukee-Mitchell

Sat 2/21

7:16 am-4:22 pm

1 stop11h 06m

$326

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Wed 2/18

12:18 pm-10:57 pm

2 stops8h 39m

Milwaukee-Mitchell

Sat 2/21

7:16 am-4:22 pm

1 stop11h 06m

$331

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Wed 4/8

7:08 pm-2:14 pm

1 stop17h 06m

Milwaukee-Mitchell

Tue 4/14

3:10 pm-9:39 am

1 stop20h 29m

$333

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Wed 2/18

11:58 pm-11:01 am

1 stop9h 03m

Milwaukee-Mitchell

Sat 2/21

3:11 pm-10:49 pm

1 stop9h 38m

$337

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Sun 2/15

10:20 pm-9:09 am

1 stop8h 49m

Milwaukee-Mitchell

Tue 2/24

5:25 am-12:02 pm

1 stop8h 37m

$338

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Tue 2/10

1:11 pm-9:15 pm

1 stop6h 04m

Milwaukee-Mitchell

Sat 2/14

2:20 pm-9:05 pm

1 stop8h 45m

$339

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 typical price of a round-trip flight between Ontario and Milwaukee?

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 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?
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 8,118 reviews	Search Delta flights
American Airlines	PriceFrom $276	Free Cancellation	Rating 7.2 11,197 reviews	Search American Airlines flights
United Airlines	PriceFrom $309	Free Cancellation	Rating 7.4 9,205 reviews	Search United Airlines flights
Southwest	PriceFrom $330	Free Cancellation	Rating 8.0 4,268 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.