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

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

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.

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 $448.

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 has the shortest travel time from Ontario to Milwaukee?

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

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.

$146 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

Round-trip

One-way

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1:15 pm - 9:55 pmONT Ontario-MKE Milwaukee-Mitchell

6h 40m1 stop Salt Lake City

3:19 pm - 8:54 pmMKE Milwaukee-Mitchell-ONT Ontario

7h 35m1 stop Atlanta Hartsfield-Jackson

$324Delta

Thu, Nov 19 - Wed, Nov 25

12:50 pm - 11:15 pmONT Ontario-MKE Milwaukee-Mitchell

8h 25m1 stop Phoenix Sky Harbor Intl

2:50 pm - 8:40 pmMKE Milwaukee-Mitchell-ONT Ontario

7h 50m1 stop Las Vegas Harry Reid Intl

$325Southwest

Thu, Dec 3 - Mon, Dec 7

1:30 pm - 11:15 pmONT Ontario-MKE Milwaukee-Mitchell

7h 45m2 stops Las Vegas Harry Reid Intl Phoenix Sky Harbor Intl

5:55 pm - 9:45 pmMKE Milwaukee-Mitchell-ONT Ontario

5h 50m1 stop Denver Intl

$330Southwest

Thu, Dec 3 - Mon, Dec 7

5:00 am - 1:24 pmONT Ontario-MKE Milwaukee-Mitchell

6h 24m1 stop Denver Intl

3:59 pm - 9:11 pmMKE Milwaukee-Mitchell-ONT Ontario

7h 12m1 stop Denver Intl

$345United Airlines

Tue, Dec 1 - Thu, Dec 3

8:40 am - 5:15 pmONT Ontario-MKE Milwaukee-Mitchell

6h 35m1 stop Phoenix Sky Harbor Intl

2:50 pm - 8:40 pmMKE Milwaukee-Mitchell-ONT Ontario

7h 50m1 stop Las Vegas Harry Reid Intl

$345Southwest

Fri, Dec 4 - Mon, Dec 7

6:00 am - 4:26 pmONT Ontario-MKE Milwaukee-Mitchell

32h 26m2 stops Denver Intl Orlando

6:13 pm - 10:17 pmMKE Milwaukee-Mitchell-ONT Ontario

30h 04m2 stops Orlando Denver Intl

$348Frontier

Thu, Dec 3 - Mon, Dec 7

5:00 am - 1:24 pmONT Ontario-MKE Milwaukee-Mitchell

6h 24m1 stop Denver Intl

8:30 am - 5:36 pmMKE Milwaukee-Mitchell-ONT Ontario

11h 06m2 stops Chicago O'Hare Intl San Francisco

$350United Airlines

Tue, Dec 1 - Thu, Dec 3

6:30 am - 1:59 pmONT Ontario-MKE Milwaukee-Mitchell

5h 29m1 stop Phoenix Sky Harbor Intl

7:00 am - 1:19 pmMKE Milwaukee-Mitchell-ONT Ontario

8h 19m1 stop Dallas/Fort Worth

$359American Airlines

Thu, Nov 19 - Thu, Nov 26

6:30 am - 1:59 pmONT Ontario-MKE Milwaukee-Mitchell

5h 29m1 stop Phoenix Sky Harbor Intl

7:00 am - 5:13 pmMKE Milwaukee-Mitchell-ONT Ontario

12h 13m2 stops Dallas/Fort Worth Phoenix Sky Harbor Intl

$364American Airlines

Thu, Nov 19 - Thu, Nov 26

6:30 am - 1:59 pmONT Ontario-MKE Milwaukee-Mitchell

5h 29m1 stop Phoenix Sky Harbor Intl

7:00 am - 1:19 pmMKE Milwaukee-Mitchell-ONT Ontario

8h 19m1 stop Dallas/Fort Worth

$393American Airlines

Thu, Nov 19 - Thu, Nov 26

Cheap last minute flights

Enter your travel dates to find the best prices.

6:00 am - 3:42 pmONT Ontario-MKE Milwaukee-Mitchell

7h 42m1 stop Seattle/Tacoma Intl

4:34 pm - 11:06 pmMKE Milwaukee-Mitchell-ONT Ontario

8h 32m1 stop Seattle/Tacoma Intl

$695Alaska Airlines

Tue, Nov 3 - Thu, Nov 5

6:00 am - 3:42 pmONT Ontario-MKE Milwaukee-Mitchell

7h 42m1 stop Seattle/Tacoma Intl

11:38 am - 11:06 pmMKE Milwaukee-Mitchell-ONT Ontario

13h 28m2 stops Chicago O'Hare Intl Seattle/Tacoma Intl

$800Alaska Airlines

Tue, Nov 3 - Thu, Nov 5

6:00 am - 3:36 pmONT Ontario-MKE Milwaukee-Mitchell

7h 36m1 stop Seattle/Tacoma Intl

4:40 pm - 3:13 pmMKE Milwaukee-Mitchell-ONT Ontario

24h 33m1 stop Seattle/Tacoma Intl

$983Alaska Airlines

Thu, Nov 5 - Sun, Nov 8

6:02 am - 4:19 pmONT Ontario-MKE Milwaukee-Mitchell

8h 17m1 stop Seattle/Tacoma Intl

4:40 pm - 3:13 pmMKE Milwaukee-Mitchell-ONT Ontario

24h 33m1 stop Seattle/Tacoma Intl

$999Alaska Airlines

Sat, Oct 31 - Sat, Nov 7

6:02 am - 4:19 pmONT Ontario-MKE Milwaukee-Mitchell

8h 17m1 stop Seattle/Tacoma Intl

4:40 pm - 3:13 pmMKE Milwaukee-Mitchell-ONT Ontario

24h 33m1 stop Seattle/Tacoma Intl

$999Alaska Airlines

Sat, Oct 31 - Sat, Nov 7

6:00 am - 3:42 pmONT Ontario-MKE Milwaukee-Mitchell

7h 42m1 stop Seattle/Tacoma Intl

4:40 pm - 3:13 pmMKE Milwaukee-Mitchell-ONT Ontario

24h 33m1 stop Seattle/Tacoma Intl

$1,128Alaska Airlines

Mon, Nov 2 - Tue, Nov 3

6:00 am - 3:36 pmONT Ontario-MKE Milwaukee-Mitchell

7h 36m1 stop Seattle/Tacoma Intl

4:40 pm - 11:06 pmMKE Milwaukee-Mitchell-ONT Ontario

8h 26m1 stop Seattle/Tacoma Intl

$1,543Alaska Airlines

Thu, Nov 5 - Sun, Nov 8

5:00 am - 1:34 pmONT Ontario-MKE Milwaukee-Mitchell

6h 34m1 stop Denver Intl

2:35 pm - 8:51 pmMKE Milwaukee-Mitchell-ONT Ontario

8h 16m1 stop Denver Intl

$1,619United Airlines

Wed, Nov 4 - Fri, Nov 6

6:00 am - 3:42 pmONT Ontario-MKE Milwaukee-Mitchell

7h 42m1 stop Seattle/Tacoma Intl

5:04 am - 6:21 pmMKE Milwaukee-Mitchell-ONT Ontario

15h 17m2 stops Chicago O'Hare Intl Seattle/Tacoma Intl

$1,936Alaska Airlines

Mon, Nov 2 - Tue, Nov 3

1:35 pm - 9:56 pmONT Ontario-MKE Milwaukee-Mitchell

6h 21m1 stop Salt Lake City

3:20 pm - 10:11 pmMKE Milwaukee-Mitchell-ONT Ontario

8h 51m2 stops Minneapolis St Paul Salt Lake City

$3,019Delta

Wed, Nov 4 - Fri, Nov 6

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Alaska Airlines flights from Ontario to Milwaukee

Our best Alaska Airlines deals on Ontario to Milwaukee flight tickets

Alaska Airlines

Nov 19

ONT6:00 amOntario

7h 42m

1 stop

MKE3:42 pmMilwaukee-Mitchell

Dec 3

MKE4:25 pmMilwaukee-Mitchell

8h 34m

1 stop

ONT10:59 pmOntario

$393

Alaska Airlines

Nov 26

ONT6:00 amOntario

7h 35m

1 stop

MKE3:35 pmMilwaukee-Mitchell

Dec 3

MKE4:25 pmMilwaukee-Mitchell

8h 34m

1 stop

ONT10:59 pmOntario

$395

Alaska Airlines

Nov 23

ONT6:00 amOntario

7h 35m

1 stop

MKE3:35 pmMilwaukee-Mitchell

Dec 4

MKE4:25 pmMilwaukee-Mitchell

8h 34m

1 stop

ONT10:59 pmOntario

$411

Delta flights from Ontario to Milwaukee

Our best Delta deals on Ontario to Milwaukee flight tickets

Delta

Nov 19

ONT1:15 pmOntario

6h 40m

1 stop

MKE9:55 pmMilwaukee-Mitchell

Nov 25

MKE3:19 pmMilwaukee-Mitchell

7h 35m

1 stop

ONT8:54 pmOntario

$324

Delta

Nov 18

ONT1:15 pmOntario

6h 40m

1 stop

MKE9:55 pmMilwaukee-Mitchell

Dec 4

MKE12:53 pmMilwaukee-Mitchell

7h 45m

1 stop

ONT6:38 pmOntario

$376

Delta

Nov 18

ONT1:15 pmOntario

6h 40m

1 stop

MKE9:55 pmMilwaukee-Mitchell

Dec 2

MKE7:20 amMilwaukee-Mitchell

6h 57m

1 stop

ONT12:17 pmOntario

$389

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

OntarioMilwaukee

ONT Ontario - MKE Milwaukee-Mitchell

ONTMKE

Ontario

Thu 11/19

1:15 pm-9:55 pm

1 stop6h 40m

Milwaukee-Mitchell

Wed 11/25

3:19 pm-8:54 pm

1 stop7h 35m

$324

OntarioMilwaukee

ONT Ontario - MKE Milwaukee-Mitchell

ONTMKE

Ontario

Thu 12/3

12:50 pm-11:15 pm

1 stop8h 25m

Milwaukee-Mitchell

Mon 12/7

2:50 pm-8:40 pm

1 stop7h 50m

$325

Quickest round-trip

OntarioMilwaukee

ONT Ontario - MKE Milwaukee-Mitchell

ONTMKE

Ontario

Thu 12/3

1:30 pm-11:15 pm

2 stops7h 45m

Milwaukee-Mitchell

Mon 12/7

5:55 pm-9:45 pm

1 stop5h 50m

$330

OntarioMilwaukee

ONT Ontario - MKE Milwaukee-Mitchell

ONTMKE

Ontario

Tue 12/1

5:00 am-1:24 pm

1 stop6h 24m

Milwaukee-Mitchell

Thu 12/3

3:59 pm-9:11 pm

1 stop7h 12m

$345

OntarioMilwaukee

ONT Ontario - MKE Milwaukee-Mitchell

ONTMKE

Ontario

Fri 12/4

8:40 am-5:15 pm

1 stop6h 35m

Milwaukee-Mitchell

Mon 12/7

2:50 pm-8:40 pm

1 stop7h 50m

$345

OntarioMilwaukee

ONT Ontario - MKE Milwaukee-Mitchell

ONTMKE

Ontario

Thu 12/3

6:00 am-4:26 pm

2 stops32h 26m

Milwaukee-Mitchell

Mon 12/7

6:13 pm-10:17 pm

2 stops30h 04m

$348

OntarioMilwaukee

ONT Ontario - MKE Milwaukee-Mitchell

ONTMKE

Ontario

Tue 12/1

5:00 am-1:24 pm

1 stop6h 24m

Milwaukee-Mitchell

Thu 12/3

8:30 am-5:36 pm

2 stops11h 06m

$350

OntarioMilwaukee

ONT Ontario - MKE Milwaukee-Mitchell

ONTMKE

Ontario

Thu 11/19

6:30 am-1:59 pm

1 stop5h 29m

Milwaukee-Mitchell

Thu 11/26

7:00 am-1:19 pm

1 stop8h 19m

$359

OntarioMilwaukee

ONT Ontario - MKE Milwaukee-Mitchell

ONTMKE

Ontario

Thu 11/19

6:30 am-1:59 pm

1 stop5h 29m

Milwaukee-Mitchell

Thu 11/26

7:00 am-5:13 pm

2 stops12h 13m

$364

OntarioMilwaukee

ONT Ontario - MKE Milwaukee-Mitchell

ONTMKE

Ontario

Thu 11/19

6:30 am-1:59 pm

1 stop5h 29m

Milwaukee-Mitchell

Thu 11/26

7:00 am-1:19 pm

1 stop8h 19m

$393

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 February. Flight prices, which tend to average around $426, are often lower during this time because this is during the off-season. The month of August is another great option to travel to Milwaukee, with average flight prices from Ontario averaging around $429.

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	$146
Fastest flight time	5h 30m
Direct flights	None

The best one-way flight to Milwaukee from Ontario in the past 72 hours is $146. The best round-trip flight deal from Ontario to Milwaukee found on momondo in the last 72 hours is $324.

The fastest flight from Ontario to Milwaukee takes 5h 30m

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 30m, 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 4,217 reviews		Search Southwest flights
American Airlines	PriceFrom $366	Free Cancellation	Rating 7.0 12,208 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 $146

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 12/17. 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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Alaska Airlines flights from Ontario to Milwaukee

Our best Alaska Airlines deals on Ontario to Milwaukee flight tickets

Delta flights from Ontario to Milwaukee

Our best Delta 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 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

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According to popular flight searches on momondo this year

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