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?

Alaska Airlines, Delta, and American Airlines 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.

$151 Cheap Flights from Milwaukee to Ontario in 2026

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Cheap round-trip flights

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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

$268Frontier

Fri, Mar 6 - Mon, Mar 9

3:47 pm - 11:32 pm

MKE

ONT

9h 45m1 stop

12:02 pm - 2:51 pm

ONT

MKE

24h 49m1 stop

$305Alaska Airlines

Thu, Feb 26 - Wed, Mar 4

3:47 pm - 11:32 pm

MKE

ONT

9h 45m1 stop

6:14 am - 2:51 pm

ONT

MKE

30h 37m1 stop

$325Alaska Airlines

Thu, Mar 5 - Sun, Mar 8

3:10 pm - 11:59 pm

MKE

ONT

10h 49m1 stop

3:26 pm - 11:58 pm

ONT

MKE

30h 32m1 stop

$333Alaska Airlines

Wed, Apr 15 - Wed, Apr 22

2:45 pm - 9:05 pm

MKE

ONT

8h 20m1 stop

1:11 pm - 9:15 pm

ONT

MKE

6h 04m1 stop

$337Delta

Sat, Jan 24 - Mon, Jan 26

5:10 am - 10:20 am

MKE

ONT

7h 10m1 stop

10:40 am - 9:10 pm

ONT

MKE

8h 30m2 stops

$342Southwest

Tue, Feb 3 - Tue, Feb 10

3:47 pm - 3:08 pm

MKE

ONT

25h 21m1 stop

6:14 am - 2:51 pm

ONT

MKE

30h 37m1 stop

$344Alaska Airlines

Fri, Feb 27 - Sun, Mar 1

4:03 pm - 10:59 am

MKE

ONT

20h 56m1 stop

6:14 am - 2:51 pm

ONT

MKE

30h 37m1 stop

$345Alaska Airlines

Sun, Feb 8 - Sun, Feb 15

2:55 pm - 9:05 pm

MKE

ONT

8h 10m1 stop

10:30 pm - 9:16 am

ONT

MKE

8h 46m1 stop

$348Delta

Tue, Jan 20 - Sun, Jan 25

2:45 pm - 9:05 pm

MKE

ONT

8h 20m1 stop

10:30 pm - 9:10 am

ONT

MKE

8h 40m1 stop

$352Delta

Sat, Jan 31 - Sat, Feb 7

Alaska Airlines flights from Milwaukee to Ontario

Our best Alaska Airlines deals on Milwaukee to Ontario flight tickets

Alaska Airlines

Feb 26

MKE3:47 pmMilwaukee-Mitchell

9h 45m

1 stop

ONT11:32 pmOntario

Mar 4

ONT12:02 pmOntario

24h 49m

1 stop

MKE2:51 pmMilwaukee-Mitchell

$305

Find similar

Alaska Airlines

Mar 5

MKE3:47 pmMilwaukee-Mitchell

9h 45m

1 stop

ONT11:32 pmOntario

Mar 8

ONT6:14 amOntario

30h 37m

1 stop

MKE2:51 pmMilwaukee-Mitchell

$325

Find similar

Alaska Airlines

Apr 15

MKE3:10 pmMilwaukee-Mitchell

10h 49m

1 stop

ONT11:59 pmOntario

Apr 22

ONT3:26 pmOntario

30h 32m

1 stop

MKE11:58 pmMilwaukee-Mitchell

$333

Find similar

Delta flights from Milwaukee to Ontario

Our best Delta deals on Milwaukee to Ontario flight tickets

Delta

Jan 24

MKE2:45 pmMilwaukee-Mitchell

8h 20m

1 stop

ONT9:05 pmOntario

Jan 26

ONT1:11 pmOntario

6h 04m

1 stop

MKE9:15 pmMilwaukee-Mitchell

$337

Find similar

Delta

Jan 20

MKE2:55 pmMilwaukee-Mitchell

8h 10m

1 stop

ONT9:05 pmOntario

Jan 25

ONT10:30 pmOntario

8h 46m

1 stop

MKE9:16 amMilwaukee-Mitchell

$348

Find similar

Delta

Jan 31

MKE2:45 pmMilwaukee-Mitchell

8h 20m

1 stop

ONT9:05 pmOntario

Feb 7

ONT10:30 pmOntario

8h 40m

1 stop

MKE9:10 amMilwaukee-Mitchell

$352

Find similar

Fly from

Fly to

Route

Depart

Return

Price

MilwaukeeOntario

MKE - ONT

MKEONT

Milwaukee-Mitchell

Fri 3/6

7:46 pm-12:01 am

1 stop6h 15m

Ontario

Mon 3/9

6:15 am-6:51 pm

1 stop10h 36m

$268

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

$305

MilwaukeeOntario

MKE - ONT

MKEONT

Milwaukee-Mitchell

Thu 3/5

3:47 pm-11:32 pm

1 stop9h 45m

Ontario

Sun 3/8

6:14 am-2:51 pm

1 stop30h 37m

$325

MilwaukeeOntario

MKE - ONT

MKEONT

Milwaukee-Mitchell

Wed 4/15

3:10 pm-11:59 pm

1 stop10h 49m

Ontario

Wed 4/22

3:26 pm-11:58 pm

1 stop30h 32m

$333

MilwaukeeOntario

MKE - ONT

MKEONT

Milwaukee-Mitchell

Sat 1/24

2:45 pm-9:05 pm

1 stop8h 20m

Ontario

Mon 1/26

1:11 pm-9:15 pm

1 stop6h 04m

$337

MilwaukeeOntario

MKE - ONT

MKEONT

Milwaukee-Mitchell

Tue 2/3

5:10 am-10:20 am

1 stop7h 10m

Ontario

Tue 2/10

10:40 am-9:10 pm

2 stops8h 30m

$342

MilwaukeeOntario

MKE - ONT

MKEONT

Milwaukee-Mitchell

Fri 2/27

3:47 pm-3:08 pm

1 stop25h 21m

Ontario

Sun 3/1

6:14 am-2:51 pm

1 stop30h 37m

$344

MilwaukeeOntario

MKE - ONT

MKEONT

Milwaukee-Mitchell

Sun 2/8

4:03 pm-10:59 am

1 stop20h 56m

Ontario

Sun 2/15

6:14 am-2:51 pm

1 stop30h 37m

$345

MilwaukeeOntario

MKE - ONT

MKEONT

Milwaukee-Mitchell

Tue 1/20

2:55 pm-9:05 pm

1 stop8h 10m

Ontario

Sun 1/25

10:30 pm-9:16 am

1 stop8h 46m

$348

MilwaukeeOntario

MKE - ONT

MKEONT

Milwaukee-Mitchell

Sat 1/31

2:45 pm-9:05 pm

1 stop8h 20m

Ontario

Sat 2/7

10:30 pm-9:10 am

1 stop8h 40m

$352

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, 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 $364. If you aren’t able to travel during the month of September, then book flights to Ontario from Milwaukee during August instead. Flights to Ontario in August, while not as cheap as those in September, still average around $376.

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.

Search flight deals

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 (53% of total bookings). The next most popular airlines are American Airlines (21%), 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 11,077 reviews	Search American Airlines flights
Delta	PriceFrom $300	Free Cancellation	Rating 7.9 8,023 reviews	Search Delta flights
Southwest	PriceFrom $330	Free Cancellation	Rating 8.0 4,253 reviews	Search Southwest flights
United Airlines	PriceFrom $344	Free Cancellation	Rating 7.4 9,138 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.