What airlines fly to Ontario?

American Airlines, United Airlines and Spirit Airlines 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 9 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?

United Airlines, Southwest, and Delta 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 January 2026, there are 4 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.

$110 Cheap Flights from Milwaukee to Ontario in 2026

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7:46 pm - 12:01 am

MKE

ONT

6h 15m1 stop

6:15 am - 6:51 pm

ONT

MKE

10h 36m1 stop

$219Frontier

Mon, Mar 9 - Mon, Mar 16

3:47 pm - 10:44 pm

MKE

ONT

8h 57m1 stop

6:14 am - 2:51 pm

ONT

MKE

30h 37m1 stop

$245Alaska Airlines

Wed, Feb 25 - Tue, Mar 3

3:47 pm - 10:44 pm

MKE

ONT

8h 57m1 stop

6:14 am - 2:51 pm

ONT

MKE

30h 37m1 stop

$255Alaska Airlines

Wed, Feb 25 - Sat, Feb 28

3:47 pm - 11:32 pm

MKE

ONT

9h 45m1 stop

6:14 am - 2:51 pm

ONT

MKE

30h 37m1 stop

$256Alaska Airlines

Mon, Mar 2 - Tue, Mar 10

3:47 pm - 11:32 pm

MKE

ONT

9h 45m1 stop

12:02 pm - 2:51 pm

ONT

MKE

24h 49m1 stop

$265Alaska Airlines

Thu, Feb 26 - Wed, Mar 4

7:46 pm - 11:59 pm

MKE

ONT

6h 13m1 stop

6:15 am - 6:51 pm

ONT

MKE

10h 36m1 stop

$268Frontier

Fri, Mar 6 - Mon, Mar 9

7:46 pm - 12:01 am

MKE

ONT

6h 15m1 stop

6:15 am - 6:51 pm

ONT

MKE

10h 36m1 stop

$269Frontier

Fri, Mar 6 - Mon, Mar 16

5:30 am - 11:31 am

MKE

ONT

8h 01m1 stop

1:11 pm - 9:15 pm

ONT

MKE

6h 04m1 stop

$277Delta

Wed, Jan 28 - Tue, Feb 3

11:51 am - 6:42 pm

MKE

ONT

8h 51m1 stop

2:39 pm - 11:38 pm

ONT

MKE

6h 59m1 stop

$279American Airlines

Thu, Feb 12 - Tue, Feb 17

7:46 pm - 12:01 am

MKE

ONT

6h 15m1 stop

6:15 am - 6:51 pm

ONT

MKE

10h 36m1 stop

$280Frontier

Fri, Mar 13 - Mon, Mar 16

Frontier flights from Milwaukee to Ontario

Our best Frontier deals on Milwaukee to Ontario flight tickets

Frontier

Mar 9

MKE7:46 pmMilwaukee-Mitchell

6h 15m

1 stop

ONT12:01 amOntario

Mar 16

ONT6:15 amOntario

10h 36m

1 stop

MKE6:51 pmMilwaukee-Mitchell

$219

Frontier

Mar 6

MKE7:46 pmMilwaukee-Mitchell

6h 15m

1 stop

ONT12:01 amOntario

Mar 16

ONT6:15 amOntario

10h 36m

1 stop

MKE6:51 pmMilwaukee-Mitchell

$269

Frontier

Mar 13

MKE7:46 pmMilwaukee-Mitchell

6h 15m

1 stop

ONT12:01 amOntario

Mar 16

ONT6:15 amOntario

10h 36m

1 stop

MKE6:51 pmMilwaukee-Mitchell

$280

Alaska Airlines flights from Milwaukee to Ontario

Our best Alaska Airlines deals on Milwaukee to Ontario flight tickets

Alaska Airlines

Feb 25

MKE3:47 pmMilwaukee-Mitchell

8h 57m

1 stop

ONT10:44 pmOntario

Mar 3

ONT6:14 amOntario

30h 37m

1 stop

MKE2:51 pmMilwaukee-Mitchell

$245

Alaska Airlines

Feb 25

MKE3:47 pmMilwaukee-Mitchell

8h 57m

1 stop

ONT10:44 pmOntario

Feb 28

ONT6:14 amOntario

30h 37m

1 stop

MKE2:51 pmMilwaukee-Mitchell

$255

Alaska Airlines

Mar 2

MKE3:47 pmMilwaukee-Mitchell

9h 45m

1 stop

ONT11:32 pmOntario

Mar 10

ONT6:14 amOntario

30h 37m

1 stop

MKE2:51 pmMilwaukee-Mitchell

$256

Fly from

Fly to

Route

Depart

Return

Price

MilwaukeeOntario

MKE - ONT

MKEONT

Milwaukee-Mitchell

Mon 3/9

7:46 pm-12:01 am

1 stop6h 15m

Ontario

Mon 3/16

6:15 am-6:51 pm

1 stop10h 36m

$219

MilwaukeeOntario

MKE - ONT

MKEONT

Milwaukee-Mitchell

Wed 2/25

3:47 pm-10:44 pm

1 stop8h 57m

Ontario

Tue 3/3

6:14 am-2:51 pm

1 stop30h 37m

$245

MilwaukeeOntario

MKE - ONT

MKEONT

Milwaukee-Mitchell

Wed 2/25

3:47 pm-10:44 pm

1 stop8h 57m

Ontario

Sat 2/28

6:14 am-2:51 pm

1 stop30h 37m

$255

MilwaukeeOntario

MKE - ONT

MKEONT

Milwaukee-Mitchell

Mon 3/2

3:47 pm-11:32 pm

1 stop9h 45m

Ontario

Tue 3/10

6:14 am-2:51 pm

1 stop30h 37m

$256

MilwaukeeOntario

MKE - ONT

MKEONT

Milwaukee-Mitchell

Thu 2/26

3:47 pm-11:32 pm

1 stop9h 45m

Ontario

Wed 3/4

12:02 pm-2:51 pm

1 stop24h 49m

$265

MilwaukeeOntario

MKE - ONT

MKEONT

Milwaukee-Mitchell

Fri 3/6

7:46 pm-11:59 pm

1 stop6h 13m

Ontario

Mon 3/9

6:15 am-6:51 pm

1 stop10h 36m

$268

MilwaukeeOntario

MKE - ONT

MKEONT

Milwaukee-Mitchell

Fri 3/6

7:46 pm-12:01 am

1 stop6h 15m

Ontario

Mon 3/16

6:15 am-6:51 pm

1 stop10h 36m

$269

MilwaukeeOntario

MKE - ONT

MKEONT

Milwaukee-Mitchell

Wed 1/28

5:30 am-11:31 am

1 stop8h 01m

Ontario

Tue 2/3

1:11 pm-9:15 pm

1 stop6h 04m

$277

MilwaukeeOntario

MKE - ONT

MKEONT

Milwaukee-Mitchell

Thu 2/12

11:51 am-6:42 pm

1 stop8h 51m

Ontario

Tue 2/17

2:39 pm-11:38 pm

1 stop6h 59m

$279

MilwaukeeOntario

MKE - ONT

MKEONT

Milwaukee-Mitchell

Fri 3/13

7:46 pm-12:01 am

1 stop6h 15m

Ontario

Mon 3/16

6:15 am-6:51 pm

1 stop10h 36m

$280

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 cheapest month to fly to Ontario?

In general, January 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 $303. If you aren’t able to travel during the month of January, then book flights to Ontario from Milwaukee during September instead. Flights to Ontario in September, while not as cheap as those in January, still average around $364.

How have Milwaukee to Ontario flight prices changed over time?

As of January 2026, prices for Milwaukee to Ontario flights are approximately 9% more expensive when compared to flights at the same time last year.

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	5h 50m
Direct flights	None

The fastest flight from Milwaukee to Ontario takes 5h 50m

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

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How far is Milwaukee-Mitchell to Ontario by plane?
There are 1710.4 mi between Milwaukee-Mitchell and Ontario. 5h 50m 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 January 2026, there are 4 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 (52% of total bookings). The next most popular airlines are American Airlines (20%), United Airlines (18%), and Delta (9%).

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
American Airlines	PriceFrom $278	Free Cancellation	Rating 7.2 11,095 reviews	Search American Airlines flights
Delta	PriceFrom $300	Free Cancellation	Rating 7.9 8,025 reviews	Search Delta flights
Southwest	PriceFrom $330	Free Cancellation	Rating 8.0 4,248 reviews	Search Southwest flights
United Airlines	PriceFrom $344	Free Cancellation	Rating 7.4 9,139 reviews	Search United 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.