What airlines fly to Milwaukee?

American Airlines, United Airlines and Frontier 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 41% of people opting to fly with this airline when traveling to Milwaukee. Keep in mind that there are 8 different airlines that fly to Milwaukee on a routine basis, so you have a few additional options to choose from.

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

Flights via Denver (DEN) offer the lowest average round-trip price of $448.

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

Flights connecting via Denver (DEN) have the shortest average one-way travel time: 5h 30m.

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

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

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 has the shortest connection time from Ontario to Milwaukee?

Denver (DEN) has the shortest average layover time for this route: 0h 58m.

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 October 2026, there are 2 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.

$140 Cheap Flights from Ontario to Milwaukee in 2026/27

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from Ontario to Milwaukee

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One-way

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9:05 am - 7:00 pmONT Ontario-MKE Milwaukee-Mitchell

7h 55m1 stop Las Vegas Harry Reid Intl

5:15 am - 12:10 pmMKE Milwaukee-Mitchell-ONT Ontario

8h 55m1 stop Phoenix Sky Harbor Intl

$279Southwest

Thu, Nov 26 - Wed, Dec 2

5:45 am - 2:55 pmONT Ontario-MKE Milwaukee-Mitchell

7h 10m1 stop Las Vegas Harry Reid Intl

5:40 am - 12:25 pmMKE Milwaukee-Mitchell-ONT Ontario

8h 45m1 stop Chicago Midway

$279Southwest

Thu, Dec 10 - Sat, Feb 20

1:11 pm - 9:52 pmONT Ontario-MKE Milwaukee-Mitchell

6h 41m1 stop Salt Lake City

5:20 am - 11:07 amMKE Milwaukee-Mitchell-ONT Ontario

7h 47m1 stop Atlanta Hartsfield-Jackson

$279Delta

Wed, Dec 16 - Thu, Dec 17

1:11 pm - 9:52 pmONT Ontario-MKE Milwaukee-Mitchell

6h 41m1 stop Salt Lake City

5:20 am - 11:07 amMKE Milwaukee-Mitchell-ONT Ontario

7h 47m1 stop Atlanta Hartsfield-Jackson

$279Delta

Mon, Dec 14 - Thu, Dec 17

4:00 pm - 11:25 pmONT Ontario-MKE Milwaukee-Mitchell

5h 25m1 stop Las Vegas Harry Reid Intl

8:00 pm - 11:45 pmMKE Milwaukee-Mitchell-ONT Ontario

5h 45m1 stop Las Vegas Harry Reid Intl

$279Southwest

Thu, Dec 17 - Sat, Dec 19

1:11 pm - 9:52 pmONT Ontario-MKE Milwaukee-Mitchell

6h 41m1 stop Salt Lake City

5:20 am - 11:07 amMKE Milwaukee-Mitchell-ONT Ontario

7h 47m1 stop Atlanta Hartsfield-Jackson

$279Delta

Tue, Dec 15 - Thu, Dec 17

5:55 am - 3:40 pmONT Ontario-MKE Milwaukee-Mitchell

7h 45m2 stops Phoenix Sky Harbor Intl Dallas Love Field

5:40 am - 12:25 pmMKE Milwaukee-Mitchell-ONT Ontario

8h 45m1 stop Chicago Midway

$284Southwest

Thu, Dec 10 - Sat, Feb 20

6:00 am - 4:24 pmONT Ontario-MKE Milwaukee-Mitchell

8h 24m1 stop Chicago O'Hare Intl

6:40 am - 3:29 pmMKE Milwaukee-Mitchell-ONT Ontario

10h 49m2 stops Dallas/Fort Worth Phoenix Sky Harbor Intl

$341American Airlines

Fri, Jan 1 - Wed, Jan 6

9:35 am - 8:00 pmONT Ontario-MKE Milwaukee-Mitchell

8h 25m2 stops Phoenix Sky Harbor Intl Chicago O'Hare Intl

2:09 pm - 9:57 pmMKE Milwaukee-Mitchell-ONT Ontario

9h 48m2 stops Chicago O'Hare Intl Phoenix Sky Harbor Intl

$346American Airlines

Thu, Dec 17 - Tue, Dec 22

9:28 am - 8:05 pmONT Ontario-MKE Milwaukee-Mitchell

8h 37m2 stops Phoenix Sky Harbor Intl Chicago O'Hare Intl

2:28 pm - 11:34 pmMKE Milwaukee-Mitchell-ONT Ontario

11h 06m1 stop Chicago O'Hare Intl

$364American Airlines

Fri, Feb 19 - Mon, Feb 22

Cheap last minute flights

Enter your travel dates to find the best prices.

7:07 am - 5:25 pmONT Ontario-MKE Milwaukee-Mitchell

8h 18m1 stop Atlanta Hartsfield-Jackson

5:30 am - 11:06 amMKE Milwaukee-Mitchell-ONT Ontario

7h 36m1 stop Atlanta Hartsfield-Jackson

$607Delta

Sat, Oct 24 - Wed, Oct 28

12:16 pm - 11:53 pmONT Ontario-MKE Milwaukee-Mitchell

9h 37m1 stop Atlanta Hartsfield-Jackson

7:05 am - 12:36 pmMKE Milwaukee-Mitchell-ONT Ontario

7h 31m1 stop Salt Lake City

$607Delta

Sat, Oct 24 - Wed, Nov 4

7:07 am - 5:25 pmONT Ontario-MKE Milwaukee-Mitchell

8h 18m1 stop Atlanta Hartsfield-Jackson

5:30 am - 11:06 amMKE Milwaukee-Mitchell-ONT Ontario

7h 36m1 stop Atlanta Hartsfield-Jackson

$607Delta

Sat, Oct 24 - Sat, Oct 31

7:07 am - 5:25 pmONT Ontario-MKE Milwaukee-Mitchell

8h 18m1 stop Atlanta Hartsfield-Jackson

5:30 am - 11:06 amMKE Milwaukee-Mitchell-ONT Ontario

7h 36m1 stop Atlanta Hartsfield-Jackson

$607Delta

Sat, Oct 24 - Tue, Nov 3

8:20 am - 4:20 pmONT Ontario-MKE Milwaukee-Mitchell

6h 00m1 stop Phoenix Sky Harbor Intl

5:15 am - 9:20 amMKE Milwaukee-Mitchell-ONT Ontario

6h 05m1 stop Phoenix Sky Harbor Intl

$695Southwest

Thu, Oct 29 - Tue, Nov 3

1:05 pm - 10:50 pmONT Ontario-MKE Milwaukee-Mitchell

7h 45m2 stops Phoenix Sky Harbor Intl Denver Intl

11:40 am - 7:45 pmMKE Milwaukee-Mitchell-ONT Ontario

10h 05m2 stops Dallas Love Field Phoenix Sky Harbor Intl

$706Southwest

Thu, Oct 29 - Tue, Nov 3

9:41 am - 7:58 pmONT Ontario-MKE Milwaukee-Mitchell

8h 17m2 stops Phoenix Sky Harbor Intl Chicago O'Hare Intl

2:36 pm - 6:43 pmMKE Milwaukee-Mitchell-ONT Ontario

6h 07m1 stop Phoenix Sky Harbor Intl

$732American Airlines

Sat, Oct 24 - Sat, Oct 31

9:41 am - 7:58 pmONT Ontario-MKE Milwaukee-Mitchell

8h 17m2 stops Phoenix Sky Harbor Intl Chicago O'Hare Intl

6:09 pm - 10:57 pmMKE Milwaukee-Mitchell-ONT Ontario

6h 48m1 stop Dallas/Fort Worth

$732American Airlines

Sat, Oct 24 - Tue, Nov 3

7:34 pm - 8:07 amONT Ontario-MKE Milwaukee-Mitchell

10h 33m2 stops Phoenix Sky Harbor Intl Chicago O'Hare Intl

6:19 pm - 11:46 pmMKE Milwaukee-Mitchell-ONT Ontario

7h 27m1 stop Dallas/Fort Worth

$780American Airlines

Sun, Oct 25 - Mon, Nov 2

4:15 pm - 12:15 amONT Ontario-MKE Milwaukee-Mitchell

6h 00m1 stop Phoenix Sky Harbor Intl

6:10 pm - 10:40 pmMKE Milwaukee-Mitchell-ONT Ontario

6h 30m1 stop Denver Intl

$783Southwest

Thu, Oct 29 - Sun, Nov 1

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Southwest flights from Ontario to Milwaukee

Our best Southwest deals on Ontario to Milwaukee flight tickets

Southwest

Nov 26

ONT9:05 amOntario

7h 55m

1 stop

MKE7:00 pmMilwaukee-Mitchell

Dec 2

MKE5:15 amMilwaukee-Mitchell

6h 05m

1 stop

ONT9:20 amOntario

$279

Southwest

Nov 26

ONT9:05 amOntario

7h 55m

1 stop

MKE7:00 pmMilwaukee-Mitchell

Dec 2

MKE12:45 pmMilwaukee-Mitchell

9h 05m

2 stops

ONT7:50 pmOntario

$284

Southwest

Dec 17

ONT12:10 pmOntario

8h 10m

2 stops

MKE10:20 pmMilwaukee-Mitchell

Dec 19

MKE8:00 pmMilwaukee-Mitchell

5h 45m

1 stop

ONT11:45 pmOntario

$308

Alaska Airlines flights from Ontario to Milwaukee

Our best Alaska Airlines deals on Ontario to Milwaukee flight tickets

Alaska Airlines

Dec 16

ONT6:00 amOntario

7h 27m

1 stop

MKE3:27 pmMilwaukee-Mitchell

Dec 24

MKE6:00 amMilwaukee-Mitchell

11h 03m

1 stop

ONT3:03 pmOntario

$377

Alaska Airlines

Jan 1

ONT6:00 amOntario

7h 33m

1 stop

MKE3:33 pmMilwaukee-Mitchell

Jan 6

MKE3:25 pmMilwaukee-Mitchell

9h 16m

1 stop

ONT10:41 pmOntario

$407

Alaska Airlines

Nov 20

ONT6:00 amOntario

7h 35m

1 stop

MKE3:35 pmMilwaukee-Mitchell

Nov 27

MKE4:33 pmMilwaukee-Mitchell

8h 58m

1 stop

ONT11:31 pmOntario

$441

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

OntarioMilwaukee

ONT Ontario - MKE Milwaukee-Mitchell

ONTMKE

Ontario

Thu 11/26

9:05 am-7:00 pm

1 stop7h 55m

Milwaukee-Mitchell

Wed 12/2

5:15 am-12:10 pm

1 stop8h 55m

$279

OntarioMilwaukee

ONT Ontario - MKE Milwaukee-Mitchell

ONTMKE

Ontario

Thu 12/10

5:45 am-2:55 pm

1 stop7h 10m

Milwaukee-Mitchell

Sat 2/20

5:40 am-12:25 pm

1 stop8h 45m

$279

OntarioMilwaukee

ONT Ontario - MKE Milwaukee-Mitchell

ONTMKE

Ontario

Wed 12/16

1:11 pm-9:52 pm

1 stop6h 41m

Milwaukee-Mitchell

Thu 12/17

5:20 am-11:07 am

1 stop7h 47m

$279

OntarioMilwaukee

ONT Ontario - MKE Milwaukee-Mitchell

ONTMKE

Ontario

Mon 12/14

1:11 pm-9:52 pm

1 stop6h 41m

Milwaukee-Mitchell

Thu 12/17

5:20 am-11:07 am

1 stop7h 47m

$279

Quickest round-trip

OntarioMilwaukee

ONT Ontario - MKE Milwaukee-Mitchell

ONTMKE

Ontario

Thu 12/17

4:00 pm-11:25 pm

1 stop5h 25m

Milwaukee-Mitchell

Sat 12/19

8:00 pm-11:45 pm

1 stop5h 45m

$279

OntarioMilwaukee

ONT Ontario - MKE Milwaukee-Mitchell

ONTMKE

Ontario

Tue 12/15

1:11 pm-9:52 pm

1 stop6h 41m

Milwaukee-Mitchell

Thu 12/17

5:20 am-11:07 am

1 stop7h 47m

$279

OntarioMilwaukee

ONT Ontario - MKE Milwaukee-Mitchell

ONTMKE

Ontario

Thu 12/10

5:55 am-3:40 pm

2 stops7h 45m

Milwaukee-Mitchell

Sat 2/20

5:40 am-12:25 pm

1 stop8h 45m

$284

OntarioMilwaukee

ONT Ontario - MKE Milwaukee-Mitchell

ONTMKE

Ontario

Fri 1/1

6:00 am-4:24 pm

1 stop8h 24m

Milwaukee-Mitchell

Wed 1/6

6:40 am-3:29 pm

2 stops10h 49m

$341

OntarioMilwaukee

ONT Ontario - MKE Milwaukee-Mitchell

ONTMKE

Ontario

Thu 12/17

9:35 am-8:00 pm

2 stops8h 25m

Milwaukee-Mitchell

Tue 12/22

2:09 pm-9:57 pm

2 stops9h 48m

$346

OntarioMilwaukee

ONT Ontario - MKE Milwaukee-Mitchell

ONTMKE

Ontario

Fri 2/19

9:28 am-8:05 pm

2 stops8h 37m

Milwaukee-Mitchell

Mon 2/22

2:28 pm-11:34 pm

1 stop11h 06m

$364

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 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 $406 to $469.
The lowest price recently found on this route was $279.

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 $426, are often lower during this time because this is during the off-season. The month of February is another great option to travel to Milwaukee, with average flight prices from Ontario averaging around $426.

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

According to our data, Sunday is the cheapest day to fly to Milwaukee from Ontario. The lowest ticket price found for a Sunday departure recently was $169. 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 Thursday will generally be more expensive and average around $181. Keep in mind that these prices on both days could fluctuate depending on the season and the demand.

How have Ontario to Milwaukee flight prices changed over time?

As of October 2026, prices for Ontario to Milwaukee flights are approximately 41% 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

Best Price Found	$140
Fastest flight time	5h 10m
Direct flights	None

The best one-way flight to Milwaukee from Ontario in the past 72 hours is $140. The best round-trip flight deal from Ontario to Milwaukee found on momondo in the last 72 hours is $279.

The fastest flight from Ontario to Milwaukee takes 5h 10m

There are no direct flights from Ontario to Milwaukee. There are no popular flight routes from Ontario to Milwaukee.

Search flight deals

Frequently asked questions about flying from Ontario to Milwaukee

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 October 2026, there are 2 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 69% of all bookings. The subsequent popular airline is American Airlines at 31%.

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
Southwest	PriceFrom $354	Free Cancellation	Rating 7.9 4,210 reviews		Search Southwest flights
American Airlines	PriceFrom $366	Free Cancellation	Rating 7.0 12,189 reviews		Search American Airlines flights

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Mequon

Wauwatosa

Glendale

West Bend

Kohler

Port Washington

Pewaukee

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.

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Cheap flights from Ontario to Milwaukee from $140

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 12/16. 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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Southwest flights from Ontario to Milwaukee

Our best Southwest 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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See travel insights to Milwaukee from

How to get the cheapest flight ticket from Ontario to Milwaukee

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

What is the cheapest month to fly to Milwaukee?

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

How have Ontario to Milwaukee flight prices changed over time?

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

What airlines fly to Milwaukee?

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

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

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

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

When to book flights from Ontario to Milwaukee

Cheap Ontario to Milwaukee (ONT to MKE) flight deals and tips

Best Price Found

Fastest flight time

Direct flights

Frequently asked questions about flying 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?

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

Fly your favorite airline to Milwaukee

Airlines are sorted and displayed according to clicks in the past 7 days on momondo

Cabin classes currently available on flights to Milwaukee

List of cabin classes available on flights landing in Milwaukee. Availability may vary depending on flight origin and airline.

Popular cities in the United States

Popular flights according to clicks in the last 7 days on momondo

Fly to other destinations from Ontario

According to popular flight searches on momondo this year

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