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

Delta is the most popular carrier 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 $448.

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.

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.

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 November 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.

$188 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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Cheap round-trip flights

Enter your travel dates to find the best prices.

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

6h 41m1 stop Salt Lake City

7:20 am - 12:17 pmMKE Milwaukee-Mitchell-ONT Ontario

6h 57m1 stop Salt Lake City

$357Delta

Thu, Dec 10 - Sat, Dec 12

11:20 am - 8:45 pmONT Ontario-MKE Milwaukee-Mitchell

7h 25m1 stop Denver Intl

5:50 am - 9:55 amMKE Milwaukee-Mitchell-ONT Ontario

6h 05m1 stop Denver Intl

$397Southwest

Sat, Dec 5 - Sun, Dec 6

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

6h 41m1 stop Salt Lake City

3:18 pm - 9:55 pmMKE Milwaukee-Mitchell-ONT Ontario

8h 37m1 stop Atlanta Hartsfield-Jackson

$397Delta

Thu, Dec 10 - Sun, Dec 13

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

6h 41m1 stop Salt Lake City

7:20 am - 12:17 pmMKE Milwaukee-Mitchell-ONT Ontario

6h 57m1 stop Salt Lake City

$397Delta

Fri, Dec 4 - Sun, Dec 6

1:25 pm - 9:15 pmONT Ontario-MKE Milwaukee-Mitchell

5h 50m1 stop Las Vegas Harry Reid Intl

5:05 am - 9:50 amMKE Milwaukee-Mitchell-ONT Ontario

6h 45m1 stop Phoenix Sky Harbor Intl

$399Southwest

Sat, Dec 5 - Sat, Dec 12

12:20 pm - 11:59 pmONT Ontario-MKE Milwaukee-Mitchell

9h 39m1 stop Atlanta Hartsfield-Jackson

7:20 am - 12:17 pmMKE Milwaukee-Mitchell-ONT Ontario

6h 57m1 stop Salt Lake City

$399Delta

Wed, Dec 9 - Sat, Dec 12

9:35 am - 10:09 pmONT Ontario-MKE Milwaukee-Mitchell

10h 34m2 stops Phoenix Sky Harbor Intl Dallas/Fort Worth

7:06 am - 1:24 pmMKE Milwaukee-Mitchell-ONT Ontario

8h 18m1 stop Dallas/Fort Worth

$402American Airlines

Fri, Dec 4 - Sun, Dec 6

5:50 am - 1:00 pmONT Ontario-MKE Milwaukee-Mitchell

5h 10m1 stop Las Vegas Harry Reid Intl

10:15 am - 3:25 pmMKE Milwaukee-Mitchell-ONT Ontario

7h 10m2 stops Kansas City Phoenix Sky Harbor Intl

$402Southwest

Sat, Dec 5 - Sun, Dec 6

6:30 am - 8:00 pmONT Ontario-MKE Milwaukee-Mitchell

11h 30m2 stops Phoenix Sky Harbor Intl Chicago O'Hare Intl

7:06 am - 3:35 pmMKE Milwaukee-Mitchell-ONT Ontario

10h 29m2 stops Dallas/Fort Worth Phoenix Sky Harbor Intl

$407American Airlines

Sat, Dec 5 - Sun, Dec 6

6:30 am - 8:00 pmONT Ontario-MKE Milwaukee-Mitchell

11h 30m2 stops Phoenix Sky Harbor Intl Chicago O'Hare Intl

7:06 am - 3:35 pmMKE Milwaukee-Mitchell-ONT Ontario

10h 29m2 stops Dallas/Fort Worth Phoenix Sky Harbor Intl

$407American Airlines

Fri, Dec 4 - Sun, Dec 6

Cheap last minute flights

Enter your travel dates to find the best prices.

12:02 pm - 3:42 pmONT Ontario-MKE Milwaukee-Mitchell

25h 40m1 stop Seattle/Tacoma Intl

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

8h 26m1 stop Seattle/Tacoma Intl

$705Alaska Airlines

Wed, Nov 11 - Sun, Nov 15

9:50 am - 11:06 pmONT Ontario-MKE Milwaukee-Mitchell

11h 16m2 stops Phoenix Sky Harbor Intl Charlotte Douglas

2:45 pm - 7:09 pmMKE Milwaukee-Mitchell-ONT Ontario

6h 24m1 stop Phoenix Sky Harbor Intl

$775American Airlines

Wed, Nov 11 - Sun, Nov 15

9:50 am - 11:06 pmONT Ontario-MKE Milwaukee-Mitchell

11h 16m2 stops Phoenix Sky Harbor Intl Charlotte Douglas

2:45 pm - 7:09 pmMKE Milwaukee-Mitchell-ONT Ontario

6h 24m1 stop Phoenix Sky Harbor Intl

$780American Airlines

Wed, Nov 11 - Sun, Nov 15

6:30 am - 6:34 pmONT Ontario-MKE Milwaukee-Mitchell

10h 04m2 stops Phoenix Sky Harbor Intl Chicago O'Hare Intl

7:05 am - 3:35 pmMKE Milwaukee-Mitchell-ONT Ontario

10h 30m2 stops Dallas/Fort Worth Phoenix Sky Harbor Intl

$780American Airlines

Wed, Nov 11 - Sun, Nov 15

9:50 am - 9:56 pmONT Ontario-MKE Milwaukee-Mitchell

10h 06m2 stops Phoenix Sky Harbor Intl Dallas/Fort Worth

7:05 am - 3:35 pmMKE Milwaukee-Mitchell-ONT Ontario

10h 30m2 stops Dallas/Fort Worth Phoenix Sky Harbor Intl

$785American Airlines

Wed, Nov 11 - Sun, Nov 15

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

6h 40m1 stop Salt Lake City

7:30 am - 12:17 pmMKE Milwaukee-Mitchell-ONT Ontario

6h 47m1 stop Salt Lake City

$793Delta

Fri, Nov 13 - Sun, Nov 15

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

7h 42m1 stop Seattle/Tacoma Intl

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

8h 26m1 stop Seattle/Tacoma Intl

$793Alaska Airlines

Mon, Nov 16 - Thu, Nov 19

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

7h 42m1 stop Seattle/Tacoma Intl

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

8h 26m1 stop Seattle/Tacoma Intl

$793Alaska Airlines

Thu, Nov 12 - Mon, Nov 16

1:20 pm - 10:10 pmONT Ontario-MKE Milwaukee-Mitchell

6h 50m1 stop Denver Intl

3:55 pm - 11:00 pmMKE Milwaukee-Mitchell-ONT Ontario

9h 05m2 stops Dallas Love Field Phoenix Sky Harbor Intl

$798Southwest

Fri, Nov 13 - Sun, Nov 15

8:35 am - 5:30 pmONT Ontario-MKE Milwaukee-Mitchell

6h 55m2 stops Phoenix Sky Harbor Intl Denver Intl

3:55 pm - 10:00 pmMKE Milwaukee-Mitchell-ONT Ontario

8h 05m2 stops Dallas Love Field Las Vegas Harry Reid Intl

$803Southwest

Fri, Nov 13 - Sun, Nov 15

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Delta flights from Ontario to Milwaukee

Our best Delta deals on Ontario to Milwaukee flight tickets

Delta

Dec 10

ONT1:11 pmOntario

6h 41m

1 stop

MKE9:52 pmMilwaukee-Mitchell

Dec 12

MKE7:20 amMilwaukee-Mitchell

6h 57m

1 stop

ONT12:17 pmOntario

$357

Delta

Dec 4

ONT1:11 pmOntario

6h 41m

1 stop

MKE9:52 pmMilwaukee-Mitchell

Dec 6

MKE7:20 amMilwaukee-Mitchell

6h 57m

1 stop

ONT12:17 pmOntario

$397

Delta

Dec 1

ONT12:20 pmOntario

9h 39m

1 stop

MKE11:59 pmMilwaukee-Mitchell

Dec 10

MKE10:18 amMilwaukee-Mitchell

10h 20m

1 stop

ONT6:38 pmOntario

$414

United Airlines flights from Ontario to Milwaukee

Our best United Airlines deals on Ontario to Milwaukee flight tickets

United Airlines

Dec 1

ONT5:00 amOntario

6h 24m

1 stop

MKE1:24 pmMilwaukee-Mitchell

Dec 8

MKE8:15 amMilwaukee-Mitchell

6h 19m

1 stop

ONT12:34 pmOntario

$399

United Airlines

Dec 1

ONT1:40 pmOntario

5h 30m

1 stop

MKE9:10 pmMilwaukee-Mitchell

Dec 10

MKE9:15 amMilwaukee-Mitchell

10h 21m

2 stops

ONT5:36 pmOntario

$419

United Airlines

Apr 28

ONT7:00 amOntario

6h 04m

1 stop

MKE3:04 pmMilwaukee-Mitchell

May 1

MKE4:15 pmMilwaukee-Mitchell

6h 05m

1 stop

ONT8:20 pmOntario

$438

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

OntarioMilwaukee

ONT Ontario - MKE Milwaukee-Mitchell

ONTMKE

Ontario

Thu 12/10

1:11 pm-9:52 pm

1 stop6h 41m

Milwaukee-Mitchell

Sat 12/12

7:20 am-12:17 pm

1 stop6h 57m

$357

OntarioMilwaukee

ONT Ontario - MKE Milwaukee-Mitchell

ONTMKE

Ontario

Sat 12/5

11:20 am-8:45 pm

1 stop7h 25m

Milwaukee-Mitchell

Sun 12/6

5:50 am-9:55 am

1 stop6h 05m

$397

OntarioMilwaukee

ONT Ontario - MKE Milwaukee-Mitchell

ONTMKE

Ontario

Thu 12/10

1:11 pm-9:52 pm

1 stop6h 41m

Milwaukee-Mitchell

Sun 12/13

3:18 pm-9:55 pm

1 stop8h 37m

$397

OntarioMilwaukee

ONT Ontario - MKE Milwaukee-Mitchell

ONTMKE

Ontario

Fri 12/4

1:11 pm-9:52 pm

1 stop6h 41m

Milwaukee-Mitchell

Sun 12/6

7:20 am-12:17 pm

1 stop6h 57m

$397

OntarioMilwaukee

ONT Ontario - MKE Milwaukee-Mitchell

ONTMKE

Ontario

Sat 12/5

1:25 pm-9:15 pm

1 stop5h 50m

Milwaukee-Mitchell

Sat 12/12

5:05 am-9:50 am

1 stop6h 45m

$399

OntarioMilwaukee

ONT Ontario - MKE Milwaukee-Mitchell

ONTMKE

Ontario

Wed 12/9

12:20 pm-11:59 pm

1 stop9h 39m

Milwaukee-Mitchell

Sat 12/12

7:20 am-12:17 pm

1 stop6h 57m

$399

OntarioMilwaukee

ONT Ontario - MKE Milwaukee-Mitchell

ONTMKE

Ontario

Fri 12/4

9:35 am-10:09 pm

2 stops10h 34m

Milwaukee-Mitchell

Sun 12/6

7:06 am-1:24 pm

1 stop8h 18m

$402

Quickest round-trip

OntarioMilwaukee

ONT Ontario - MKE Milwaukee-Mitchell

ONTMKE

Ontario

Sat 12/5

5:50 am-1:00 pm

1 stop5h 10m

Milwaukee-Mitchell

Sun 12/6

10:15 am-3:25 pm

2 stops7h 10m

$402

OntarioMilwaukee

ONT Ontario - MKE Milwaukee-Mitchell

ONTMKE

Ontario

Sat 12/5

6:30 am-8:00 pm

2 stops11h 30m

Milwaukee-Mitchell

Sun 12/6

7:06 am-3:35 pm

2 stops10h 29m

$407

OntarioMilwaukee

ONT Ontario - MKE Milwaukee-Mitchell

ONTMKE

Ontario

Fri 12/4

6:30 am-8:00 pm

2 stops11h 30m

Milwaukee-Mitchell

Sun 12/6

7:06 am-3:35 pm

2 stops10h 29m

$407

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 November 2026, prices for Ontario to Milwaukee flights are approximately 13% 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	$188
Fastest flight time	5h 40m
Direct flights	None

The best one-way flight to Milwaukee from Ontario in the past 72 hours is $188. The best round-trip flight deal from Ontario to Milwaukee found on momondo in the last 72 hours is $357.

The fastest flight from Ontario to Milwaukee takes 5h 40m

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 40m, 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 November 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 67% of all bookings. The subsequent popular airline is American Airlines at 33%.

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 $356	Free Cancellation	Rating 8.0 4,219 reviews		Search Southwest flights
American Airlines	PriceFrom $366	Free Cancellation	Rating 7.0 12,227 reviews		Search American Airlines flights

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Mequon

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 $188

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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Delta flights from Ontario to Milwaukee

Our best Delta deals on Ontario to Milwaukee flight tickets

United Airlines flights from Ontario to Milwaukee

Our best United 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 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.

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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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