What airlines fly to Ontario?

American Airlines, United Airlines and Frontier are the top three most popular airlines that fly to Ontario from Milwaukee 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 Ontario. Keep in mind that there are 8 different airlines that fly to Ontario on a routine basis, so you have a few additional options to choose from.

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

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

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

Prices for flights from Milwaukee-Mitchell Airport to Ontario Airport refresh daily.

How many operators does momondo search for flights from Milwaukee-Mitchell Airport to Ontario Airport?

As of August 2026, there are 3 operators available to choose from for flights from Milwaukee-Mitchell Airport to Ontario Airport.

How old do you have to be to fly from Milwaukee-Mitchell Airport to Ontario Airport?

The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Milwaukee-Mitchell Airport to Ontario Airport.

What documentation or ID do you need to fly to Ontario Airport?

The travel and health documents required for your trip to Ontario 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 Ontario Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

$162 Cheap Flights from Milwaukee to Ontario in 2026

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Find the cheapest flights from Milwaukee to Los Angeles

Round-trip

One-way

Last minute

Cheap round-trip flights

Enter your travel dates to find the best prices.

5:45 am - 10:15 am-

6h 30m

5:35 am - 1:10 pm-

5h 35m

$323Southwest

Thu, Jan 7 - Sat, Jan 9

6:00 am - 1:25 pm-

9h 25m

5:35 am - 1:10 pm-

5h 35m

$328Southwest

Thu, Jan 7 - Sat, Jan 9

6:00 am - 1:25 pm-

9h 25m

10:50 am - 9:55 pm-

9h 05m

$333Southwest

Thu, Jan 7 - Sat, Jan 9

3:15 pm - 10:35 pm-

9h 20m

5:00 am - 1:29 pm-

6h 29m

$335United Airlines

Mon, Aug 31 - Sat, Sep 5

2:55 pm - 8:05 pm-

7h 10m

10:00 pm - 9:06 am-

9h 06m

$335Delta

Fri, Sep 11 - Mon, Sep 14

4:17 pm - 9:52 pm-

7h 35m

1:06 pm - 9:41 pm-

6h 35m

$336Delta

Thu, Aug 27 - Sat, Sep 5

10:35 am - 8:01 pm-

11h 26m

5:00 am - 1:29 pm-

6h 29m

$340United Airlines

Mon, Aug 31 - Sat, Sep 5

1:19 pm - 8:53 pm-

9h 34m

11:00 am - 10:36 pm-

9h 36m

$345United Airlines

Mon, Aug 31 - Sat, Sep 5

7:00 am - 11:43 am-

6h 43m

7:11 pm - 8:01 am-

10h 50m

$368American Airlines

Sun, Sep 6 - Thu, Sep 10

7:05 am - 3:37 pm-

10h 32m

6:00 am - 5:02 pm-

9h 02m

$418American Airlines

Tue, Nov 24 - Tue, Dec 15

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Alaska Airlines flights from Milwaukee to Ontario

Our best Alaska Airlines deals on Milwaukee to Ontario flight tickets

Alaska Airlines

Oct 23

MKE3:53 pmMilwaukee-Mitchell

9h 49m

1 stop

ONT11:42 pmOntario

Oct 27

ONT6:02 amOntario

8h 17m

1 stop

MKE4:19 pmMilwaukee-Mitchell

$408

Alaska Airlines

Nov 24

MKE4:33 pmMilwaukee-Mitchell

8h 31m

1 stop

ONT11:04 pmOntario

Dec 15

ONT12:00 pmOntario

23h 52m

1 stop

MKE1:52 pmMilwaukee-Mitchell

$410

Alaska Airlines

Aug 18

MKE6:02 amMilwaukee-Mitchell

9h 07m

1 stop

ONT1:09 pmOntario

Aug 22

ONT12:00 pmOntario

9h 59m

1 stop

MKE11:59 pmMilwaukee-Mitchell

$483

Delta flights from Milwaukee to Ontario

Our best Delta deals on Milwaukee to Ontario flight tickets

Delta

Aug 27

MKE4:17 pmMilwaukee-Mitchell

7h 35m

1 stop

ONT9:52 pmOntario

Sep 5

ONT1:06 pmOntario

6h 35m

1 stop

MKE9:41 pmMilwaukee-Mitchell

$336

Delta

Aug 27

MKE4:17 pmMilwaukee-Mitchell

7h 35m

1 stop

ONT9:52 pmOntario

Sep 5

ONT1:06 pmOntario

6h 35m

1 stop

MKE9:41 pmMilwaukee-Mitchell

$338

Delta

Sep 1

MKE7:30 amMilwaukee-Mitchell

6h 46m

1 stop

ONT12:16 pmOntario

Sep 8

ONT7:05 amOntario

8h 26m

1 stop

MKE5:31 pmMilwaukee-Mitchell

$347

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

Quickest round-trip

MilwaukeeOntario

MKE - ONT

MKEONT

Milwaukee-Mitchell

Thu 1/7

5:45 am-10:15 am

1 stop6h 30m

Ontario

Sat 1/9

5:35 am-1:10 pm

1 stop5h 35m

$323

MilwaukeeOntario

MKE - ONT

MKEONT

Milwaukee-Mitchell

Thu 1/7

6:00 am-1:25 pm

2 stops9h 25m

Ontario

Sat 1/9

5:35 am-1:10 pm

1 stop5h 35m

$328

MilwaukeeOntario

MKE - ONT

MKEONT

Milwaukee-Mitchell

Thu 1/7

6:00 am-1:25 pm

2 stops9h 25m

Ontario

Sat 1/9

10:50 am-9:55 pm

2 stops9h 05m

$333

MilwaukeeOntario

MKE - ONT

MKEONT

Milwaukee-Mitchell

Mon 8/31

3:15 pm-10:35 pm

1 stop9h 20m

Ontario

Sat 9/5

5:00 am-1:29 pm

1 stop6h 29m

$335

MilwaukeeOntario

MKE - ONT

MKEONT

Milwaukee-Mitchell

Fri 9/11

2:55 pm-8:05 pm

1 stop7h 10m

Ontario

Mon 9/14

10:00 pm-9:06 am

1 stop9h 06m

$335

MilwaukeeOntario

MKE - ONT

MKEONT

Milwaukee-Mitchell

Thu 8/27

4:17 pm-9:52 pm

1 stop7h 35m

Ontario

Sat 9/5

1:06 pm-9:41 pm

1 stop6h 35m

$336

MilwaukeeOntario

MKE - ONT

MKEONT

Milwaukee-Mitchell

Mon 8/31

10:35 am-8:01 pm

2 stops11h 26m

Ontario

Sat 9/5

5:00 am-1:29 pm

1 stop6h 29m

$340

MilwaukeeOntario

MKE - ONT

MKEONT

Milwaukee-Mitchell

Mon 8/31

1:19 pm-8:53 pm

2 stops9h 34m

Ontario

Sat 9/5

11:00 am-10:36 pm

2 stops9h 36m

$345

MilwaukeeOntario

MKE - ONT

MKEONT

Milwaukee-Mitchell

Sun 9/6

7:00 am-11:43 am

1 stop6h 43m

Ontario

Thu 9/10

7:11 pm-8:01 am

2 stops10h 50m

$368

MilwaukeeOntario

MKE - ONT

MKEONT

Milwaukee-Mitchell

Tue 11/24

7:05 am-3:37 pm

2 stops10h 32m

Ontario

Tue 12/15

6:00 am-5:02 pm

1 stop9h 02m

$418

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 Milwaukee to Ontario

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

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

Prices are currently low for flights on this route.

Typical prices usually range from $356 to $437.
The lowest price recently found on this route was $323.

What is the cheapest month to fly to Ontario?

In general, September is the cheapest month to fly from Milwaukee to Ontario. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $327. If you aren’t able to travel during the month of September, then book flights to Ontario from Milwaukee during April instead. Flights to Ontario in April, while not as cheap as those in September, still average around $371.

How have Milwaukee to Ontario flight prices changed over time?

When to book flights from Milwaukee to Ontario

Are you open to changing your travel dates? Check out the ideal times to fly from Milwaukee to Ontario according to our flight data. Find out which month and days have the cheapest flights.

Estimated round-trip price

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

Find info about flight duration, direct flights, and airports for your flight from Milwaukee to Ontario

Fastest flight time	6h 18m
Direct flights	None

The fastest flight from Milwaukee to Ontario takes 6h 18m

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

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Frequently asked questions about flying from Milwaukee to Ontario

How far is Milwaukee-Mitchell to Ontario by plane?
There are 1710.4 mi between Milwaukee-Mitchell and Ontario. 6h 18m is a normal flight duration for this route.
When did momondo last update prices for flights from Milwaukee-Mitchell Airport to Ontario Airport?
Prices for flights from Milwaukee-Mitchell Airport to Ontario Airport refresh daily.
How many operators does momondo search for flights from Milwaukee-Mitchell Airport to Ontario Airport?
As of August 2026, there are 3 operators available to choose from for flights from Milwaukee-Mitchell Airport to Ontario Airport.
How old do you have to be to fly from Milwaukee-Mitchell Airport to Ontario Airport?
The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Milwaukee-Mitchell Airport to Ontario Airport.
What documentation or ID do you need to fly to Ontario Airport?
The travel and health documents required for your trip to Ontario 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 Ontario 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 Milwaukee to Ontario?
Based on momondo bookings for this flight route, the most popular airline on flight routes from Milwaukee to Ontario is Southwest (56% of total bookings). The next most popular airlines are American Airlines (22%) and United Airlines (21%).

Best airlines flying from Milwaukee to Ontario

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

Airline	Rating	Free Cancellation	Price
United Airlines	PriceFrom $306	Free Cancellation	Rating 7.4 10,059 reviews	Search United Airlines flights
Southwest	PriceFrom $327	Free Cancellation	Rating 8.0 4,222 reviews	Search Southwest flights
American Airlines	PriceFrom $356	Free Cancellation	Rating 7.1 11,848 reviews	Search American Airlines flights

Why use momondo?

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

We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from Milwaukee to Ontario for you.

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

Yes. momondo enables you to select and highlight flights to Ontario from Milwaukee with this policy.

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

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to Ontario from Milwaukee.

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

Yes momondo offers price alerts on flights to Ontario from Milwaukee. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.

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Cheap flights from Milwaukee to Los Angeles from $162

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Milwaukee to Los Angeles departing on 9/5. 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 Milwaukee to Ontario

Our best Alaska Airlines deals on Milwaukee to Ontario flight tickets

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How to get the cheapest flight ticket from Milwaukee to Ontario

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

What is the cheapest month to fly to Ontario?

How have Milwaukee to Ontario flight prices changed over time?

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

What airlines fly to Ontario?

When to book flights from Milwaukee to Ontario

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

Fastest flight time

Direct flights

Frequently asked questions about flying from Milwaukee to Ontario

Best airlines flying from Milwaukee to Ontario

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

Why use momondo?

An easier way to manage your Ontario 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

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