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.

Which airport is the most popular layover for flights between Ontario and Milwaukee?

Phoenix (PHX) was the most common stop: 50% of momondo users choosing 1-stop flights on this route connected there.

Which layover airport offers the lowest fares from Ontario to Milwaukee?

Flights via Denver (DEN) offer the lowest average round-trip price of $168.

Which layover airport has the shortest travel time from Ontario to Milwaukee?

Flights connecting via Phoenix (PHX) have the shortest average one-way travel time: 5h 15m.

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

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

Which layover airport has the shortest connection time from Ontario to Milwaukee?

Phoenix (PHX) has the shortest average layover time for this route: 0h 50m.

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 September 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.

$124 Cheap Flights from Ontario to Milwaukee in 2025/26

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Find the cheapest flights from Ontario to Milwaukee

Round-trip

One-way

Last minute

Cheap round-trip flights

6:53 am - 7:18 pmONT-MKE

10h 25m1 stop

8:04 pm - 11:50 pmMKE-ONT

5h 46m1 stop

$147Frontier

Find Deal

Mon, Oct 13 - Fri, Oct 17

8:59 pm - 2:14 pmONT-MKE

15h 15m1 stop

7:36 pm - 7:54 pmMKE-ONT

26h 18m1 stop

$249Frontier

Find Deal

Sat, Sep 27 - Fri, Oct 3

4:49 pm - 12:20 amONT-MKE

5h 31m1 stop

5:47 pm - 10:42 pmMKE-ONT

6h 55m1 stop

$327American Airlines

Find Deal

Mon, Oct 13 - Wed, Oct 15

6:17 am - 2:26 pmONT-MKE

6h 09m1 stop

7:35 am - 4:01 pmMKE-ONT

10h 26m1 stop

$329American Airlines

Find Deal

Sat, Dec 6 - Tue, Dec 9

5:50 pm - 8:19 amONT-MKE

12h 29m2 stops

4:49 pm - 11:39 pmMKE-ONT

8h 50m2 stops

$332Delta

Find Deal

Sat, Oct 25 - Mon, Oct 27

7:35 am - 9:30 pmONT-MKE

11h 55m2 stops

10:56 am - 9:20 pmMKE-ONT

12h 24m2 stops

$337Delta

Find Deal

Tue, Oct 28 - Thu, Oct 30

12:35 pm - 10:00 pmONT-MKE

7h 25m2 stops

5:05 am - 9:40 amMKE-ONT

6h 35m1 stop

$339Southwest

Find Deal

Tue, Dec 9 - Thu, Dec 11

5:20 am - 5:55 pmONT-MKE

10h 35m2 stops

5:05 am - 12:00 pmMKE-ONT

8h 55m2 stops

$344Southwest

Find Deal

Sat, Dec 6 - Tue, Dec 9

5:05 am - 11:59 pmONT-MKE

16h 54m1 stop

8:30 am - 8:24 pmMKE-ONT

13h 54m1 stop

$391United Airlines

Find Deal

Mon, Oct 13 - Wed, Oct 15

6:00 am - 5:08 pmONT-MKE

9h 08m1 stop

5:00 am - 12:51 pmMKE-ONT

9h 51m2 stops

$396United Airlines

Find Deal

Fri, Oct 10 - Tue, Oct 14

Frontier flights from Ontario to Milwaukee

Our best Frontier deals on Ontario to Milwaukee flight tickets

Frontier

Oct 13

ONT6:53 amOntario

10h 25m

1 stop

MKE7:18 pmMilwaukee-Mitchell

Oct 17

MKE8:04 pmMilwaukee-Mitchell

5h 46m

1 stop

ONT11:50 pmOntario

$147

Find similar

Frontier

Sep 27

ONT8:59 pmOntario

15h 15m

1 stop

MKE2:14 pmMilwaukee-Mitchell

Oct 3

MKE7:36 pmMilwaukee-Mitchell

26h 18m

1 stop

ONT7:54 pmOntario

$249

Find similar

Frontier

Oct 30

ONT10:40 pmOntario

18h 39m

2 stops

MKE7:19 pmMilwaukee-Mitchell

Nov 3

MKE8:04 pmMilwaukee-Mitchell

5h 46m

1 stop

ONT11:50 pmOntario

$262

Find similar

Alaska Airlines flights from Ontario to Milwaukee

Our best Alaska Airlines deals on Ontario to Milwaukee flight tickets

Alaska Airlines

Oct 28

ONT11:59 amOntario

25h 01m

1 stop

MKE3:00 pmMilwaukee-Mitchell

Oct 30

MKE3:56 pmMilwaukee-Mitchell

9h 36m

1 stop

ONT11:32 pmOntario

$326

Find similar

Alaska Airlines

Dec 9

ONT12:13 pmOntario

24h 37m

1 stop

MKE2:50 pmMilwaukee-Mitchell

Dec 11

MKE3:46 pmMilwaukee-Mitchell

9h 43m

1 stop

ONT11:29 pmOntario

$333

Find similar

Alaska Airlines

Oct 28

ONT4:11 pmOntario

20h 49m

1 stop

MKE3:00 pmMilwaukee-Mitchell

Nov 6

MKE3:56 pmMilwaukee-Mitchell

9h 36m

1 stop

ONT11:32 pmOntario

$409

Find similar

Fly from

Fly to

Route

Depart

Return

Price

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Mon 10/13

6:53 am-7:18 pm

1 stop10h 25m

Milwaukee-Mitchell

Fri 10/17

8:04 pm-11:50 pm

1 stop5h 46m

$147

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Sat 9/27

8:59 pm-2:14 pm

1 stop15h 15m

Milwaukee-Mitchell

Fri 10/3

7:36 pm-7:54 pm

1 stop26h 18m

$249

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Mon 10/13

4:49 pm-12:20 am

1 stop5h 31m

Milwaukee-Mitchell

Wed 10/15

5:47 pm-10:42 pm

1 stop6h 55m

$327

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Sat 12/6

6:17 am-2:26 pm

1 stop6h 09m

Milwaukee-Mitchell

Tue 12/9

7:35 am-4:01 pm

1 stop10h 26m

$329

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Sat 10/25

5:50 pm-8:19 am

2 stops12h 29m

Milwaukee-Mitchell

Mon 10/27

4:49 pm-11:39 pm

2 stops8h 50m

$332

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Tue 10/28

7:35 am-9:30 pm

2 stops11h 55m

Milwaukee-Mitchell

Thu 10/30

10:56 am-9:20 pm

2 stops12h 24m

$337

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Tue 12/9

12:35 pm-10:00 pm

2 stops7h 25m

Milwaukee-Mitchell

Thu 12/11

5:05 am-9:40 am

1 stop6h 35m

$339

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Sat 12/6

5:20 am-5:55 pm

2 stops10h 35m

Milwaukee-Mitchell

Tue 12/9

5:05 am-12:00 pm

2 stops8h 55m

$344

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Mon 10/13

5:05 am-11:59 pm

1 stop16h 54m

Milwaukee-Mitchell

Wed 10/15

8:30 am-8:24 pm

1 stop13h 54m

$391

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Fri 10/10

6:00 am-5:08 pm

1 stop9h 08m

Milwaukee-Mitchell

Tue 10/14

5:00 am-12:51 pm

2 stops9h 51m

$396

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

Layovers

What is the cheapest month to fly to Milwaukee?

The cheapest month to fly to Milwaukee from Ontario is in November. Flight prices, which tend to average around $346, are often lower during this time because this is during the off-season. The month of January is another great option to travel to Milwaukee, with average flight prices from Ontario averaging around $351.

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 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 $403 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 $300 on momondo.

How have Ontario to Milwaukee flight prices changed over time?

As of September 2025, prices for Ontario to Milwaukee flights are approximately 4% 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

Direct flights	None

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 10m, 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 September 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 57% of all bookings. The subsequent popular airlines are American Airlines at 29%, United Airlines at 8%, 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 7,961 reviews	Search Delta flights
American Airlines	PriceFrom $276	Free Cancellation	Rating 7.2 10,000 reviews	Search American Airlines flights
Southwest	PriceFrom $326	Free Cancellation	Rating 8.0 4,242 reviews	Search Southwest flights
United Airlines	PriceFrom $366	Free Cancellation	Rating 7.4 8,926 reviews	Search United Airlines flights

Sheboygan

Waukesha

Wauwatosa

Oak Creek

Mequon

Glendale

Kohler

Pewaukee

West Bend

Port Washington

Grafton

New Berlin

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.

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Cheap flights from Ontario to Milwaukee from $124

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Ontario to Milwaukee departing on 11/16. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

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Frontier flights from Ontario to Milwaukee

Our best Frontier deals on Ontario to Milwaukee flight tickets

Alaska Airlines flights from Ontario to Milwaukee

Our best Alaska Airlines deals on Ontario to Milwaukee flight tickets

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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

What is the cheapest month to fly to Milwaukee?

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

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

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

How have Ontario to Milwaukee flight prices changed over time?

As of September 2025, prices for Ontario to Milwaukee flights are approximately 4% more expensive when compared to flights at the same time last year.

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

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

What airlines fly to Milwaukee?

Which airport is the most popular layover for flights between Ontario and Milwaukee?

Phoenix (PHX) was the most common stop: 50% of momondo users choosing 1-stop flights on this route connected there.

Which layover airport offers the lowest fares from Ontario to Milwaukee?

Flights via Denver (DEN) offer the lowest average round-trip price of $168.

Which layover airport has the shortest travel time from Ontario to Milwaukee?

Flights connecting via Phoenix (PHX) have the shortest average one-way travel time: 5h 15m.

Which layover airport has the shortest connection time from Ontario to Milwaukee?

Phoenix (PHX) has the shortest average layover time for this route: 0h 50m.

When to book flights from Ontario to Milwaukee

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

Direct flights

How far is Ontario to Milwaukee-Mitchell by plane?

When did momondo last update prices for flights from Ontario Airport to Milwaukee-Mitchell Airport?

How many operators does momondo search 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?

What documentation or ID do you need to fly to Milwaukee-Mitchell Airport?

What is the most popular airline from Ontario to Milwaukee?

Best airlines flying from Ontario to Milwaukee

Compare and see reviews for airlines that fly from Ontario to Milwaukee with momondo

Traveling to a place near Milwaukee?

Why use momondo?

Why should I use momondo to find a flight deal from Ontario to Milwaukee?

Can I find flights from Ontario to Milwaukee with flexible booking policies on momondo?

How can momondo help me find flights from Ontario to Milwaukee?

I’m not ready to book a flight from Ontario to Milwaukee right now. Can momondo alert me if prices change?

An easier way to manage your Milwaukee trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

Find better results for your trip to the United States

Airports servicing Wisconsin