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

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

Flights via Denver (DEN) offer the lowest average round-trip price of $302.

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.

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

Denver (DEN) was the most common stop: 67% of momondo users choosing 1-stop flights on this route connected there.

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 August 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.

$84 Cheap Flights from Ontario to Milwaukee (ONT-MKE) in 2025

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Find the cheapest flights from Ontario to Milwaukee (ONT-MKE)

Round-trip

One-way

Last minute

Cheap round-trip flights

8:59 pm - 6:41 pmONT-MKE

19h 42m1 stop

8:04 pm - 7:54 pmMKE-ONT

25h 50m1 stop

$211Frontier

Find Deal

Thu, Sep 18 - Mon, Sep 22

8:59 pm - 6:41 pmONT-MKE

19h 42m1 stop

3:03 pm - 7:53 amMKE-ONT

18h 50m1 stop

$247Frontier

Find Deal

Thu, Sep 18 - Sun, Sep 21

8:59 pm - 2:14 pmONT-MKE

15h 15m1 stop

7:36 pm - 7:54 pmMKE-ONT

26h 18m1 stop

$296Frontier

Find Deal

Sat, Sep 13 - Fri, Sep 19

12:46 pm - 10:09 pmONT-MKE

7h 23m1 stop

5:50 pm - 8:55 amMKE-ONT

17h 05m1 stop

$317American Airlines

Find Deal

Wed, Nov 19 - Sun, Nov 23

9:59 am - 10:09 pmONT-MKE

10h 10m2 stops

5:50 pm - 8:55 amMKE-ONT

17h 05m1 stop

$322American Airlines

Find Deal

Wed, Nov 19 - Sun, Nov 23

5:40 pm - 8:15 amONT-MKE

12h 35m2 stops

4:30 pm - 10:23 pmMKE-ONT

7h 53m1 stop

$334Delta

Find Deal

Mon, Sep 15 - Mon, Sep 22

10:00 pm - 8:42 amONT-MKE

8h 42m2 stops

4:55 pm - 11:42 pmMKE-ONT

8h 47m2 stops

$374Delta

Find Deal

Mon, Sep 15 - Mon, Sep 22

1:15 pm - 9:11 pmONT-MKE

5h 56m1 stop

8:30 am - 12:32 pmMKE-ONT

6h 02m1 stop

$417United Airlines

Find Deal

Fri, Sep 19 - Sun, Sep 21

7:02 am - 5:06 pmONT-MKE

8h 04m1 stop

8:30 am - 3:02 pmMKE-ONT

8h 32m1 stop

$443United Airlines

Find Deal

Sat, Oct 11 - Tue, Oct 14

12:55 pm - 11:00 pmONT-MKE

8h 05m2 stops

5:35 pm - 11:25 pmMKE-ONT

7h 50m2 stops

$498Southwest

Find Deal

Fri, Sep 19 - Sun, Sep 21

Delta flights from Ontario to Milwaukee

Our best Delta deals on Ontario to Milwaukee flight tickets

Delta

Sep 15

ONT5:40 pmOntario

12h 35m

2 stops

MKE8:15 amMilwaukee-Mitchell

Sep 22

MKE4:30 pmMilwaukee-Mitchell

7h 53m

1 stop

ONT10:23 pmOntario

$334

Find similar

Delta

Sep 15

ONT10:00 pmOntario

8h 42m

2 stops

MKE8:42 amMilwaukee-Mitchell

Sep 22

MKE4:55 pmMilwaukee-Mitchell

8h 47m

2 stops

ONT11:42 pmOntario

$374

Find similar

Delta

Oct 12

ONT5:50 pmOntario

12h 29m

2 stops

MKE8:19 amMilwaukee-Mitchell

Oct 16

MKE2:04 pmMilwaukee-Mitchell

10h 18m

1 stop

ONT10:22 pmOntario

$408

Find similar

American Airlines flights from Ontario to Milwaukee

Our best American Airlines deals on Ontario to Milwaukee flight tickets

American Airlines

Nov 19

ONT12:46 pmOntario

7h 23m

1 stop

MKE10:09 pmMilwaukee-Mitchell

Nov 23

MKE5:50 pmMilwaukee-Mitchell

17h 05m

1 stop

ONT8:55 amOntario

$317

Find similar

American Airlines

Nov 19

ONT9:59 amOntario

10h 10m

2 stops

MKE10:09 pmMilwaukee-Mitchell

Nov 23

MKE5:50 pmMilwaukee-Mitchell

17h 05m

1 stop

ONT8:55 amOntario

$322

Find similar

American Airlines

Sep 15

ONT4:45 pmOntario

19h 17m

1 stop

MKE2:02 pmMilwaukee-Mitchell

Sep 22

MKE5:46 pmMilwaukee-Mitchell

6h 47m

1 stop

ONT10:33 pmOntario

$328

Find similar

Fly from

Fly to

Route

Depart

Return

Price

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Thu 9/18

8:59 pm-6:41 pm

1 stop19h 42m

Milwaukee-Mitchell

Mon 9/22

8:04 pm-7:54 pm

1 stop25h 50m

$211

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Thu 9/18

8:59 pm-6:41 pm

1 stop19h 42m

Milwaukee-Mitchell

Sun 9/21

3:03 pm-7:53 am

1 stop18h 50m

$247

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Sat 9/13

8:59 pm-2:14 pm

1 stop15h 15m

Milwaukee-Mitchell

Fri 9/19

7:36 pm-7:54 pm

1 stop26h 18m

$296

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Wed 11/19

12:46 pm-10:09 pm

1 stop7h 23m

Milwaukee-Mitchell

Sun 11/23

5:50 pm-8:55 am

1 stop17h 05m

$317

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Wed 11/19

9:59 am-10:09 pm

2 stops10h 10m

Milwaukee-Mitchell

Sun 11/23

5:50 pm-8:55 am

1 stop17h 05m

$322

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Mon 9/15

5:40 pm-8:15 am

2 stops12h 35m

Milwaukee-Mitchell

Mon 9/22

4:30 pm-10:23 pm

1 stop7h 53m

$334

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Mon 9/15

10:00 pm-8:42 am

2 stops8h 42m

Milwaukee-Mitchell

Mon 9/22

4:55 pm-11:42 pm

2 stops8h 47m

$374

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Fri 9/19

1:15 pm-9:11 pm

1 stop5h 56m

Milwaukee-Mitchell

Sun 9/21

8:30 am-12:32 pm

1 stop6h 02m

$417

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Sat 10/11

7:02 am-5:06 pm

1 stop8h 04m

Milwaukee-Mitchell

Tue 10/14

8:30 am-3:02 pm

1 stop8h 32m

$443

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Fri 9/19

12:55 pm-11:00 pm

2 stops8h 05m

Milwaukee-Mitchell

Sun 9/21

5:35 pm-11:25 pm

2 stops7h 50m

$498

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 $409 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 $308 on momondo.

How have Ontario to Milwaukee flight prices changed over time?

As of August 2025, prices for Ontario to Milwaukee flights are approximately 32% 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

Best Price Found	$84
Fastest flight time	5h 33m
Direct flights	None
Airports in Milwaukee	1 airport

The best one-way flight to Milwaukee from Ontario in the past 72 hours is $84. The best round-trip flight deal from Ontario to Milwaukee found on momondo in the last 72 hours is $211.

The fastest flight from Ontario to Milwaukee takes 5h 33m

There are no direct flights from Ontario to Milwaukee. Popular non-direct route for this connection is Ontario Airport - Milwaukee-Mitchell Airport.

There is 1 airport near Milwaukee: Milwaukee-Mitchell (MKE)

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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 33m, 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 August 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 58% of all bookings. The subsequent popular airlines are American Airlines at 28%, Delta at 8%, and United Airlines at 5%.

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 8.0 7,981 reviews	Search Delta flights
American Airlines	PriceFrom $298	Free Cancellation	Rating 7.2 10,000 reviews	Search American Airlines flights
Southwest	PriceFrom $326	Free Cancellation	Rating 8.0 4,246 reviews	Search Southwest flights
United Airlines	PriceFrom $391	Free Cancellation	Rating 7.4 8,925 reviews	Search United Airlines flights

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Mequon

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Glendale

Kohler

Pewaukee

West Bend

Port Washington

Grafton

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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 $84

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 10/17. 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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Find the cheapest flights from Ontario to Milwaukee (ONT-MKE)

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Delta flights from Ontario to Milwaukee

Our best Delta deals on Ontario to Milwaukee flight tickets

American Airlines flights from Ontario to Milwaukee

Our best American 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 August 2025, prices for Ontario to Milwaukee flights are approximately 32% cheaper when compared to flights at the same time last year.

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

Frontier, Alaska Airlines, 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?

Denver (DEN) was the most common stop: 67% 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 $302.

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

Best Price Found

Fastest flight time

Direct flights

Airports in Milwaukee

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