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, Frontier, 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.

$169 Cheap Flights from Milwaukee to Ontario in 2026

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Cheap round-trip flights

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7:00 am - 2:32 pm

MKE

ONT

9h 32m

1 stop

3:26 pm - 3:46 pm

ONT

MKE

22h 20m

1 stop

$323Alaska Airlines

sáb., may. 2 - mar., may. 12

2:55 pm - 9:05 pm

MKE

ONT

8h 10m

1 stop

1:11 pm - 9:15 pm

ONT

MKE

6h 04m

1 stop

$337Delta

mar., feb. 10 - mié., feb. 11

5:30 am - 11:31 am

MKE

ONT

8h 01m

1 stop

10:30 pm - 9:10 am

ONT

MKE

8h 40m

1 stop

$339Delta

mar., feb. 3 - mar., feb. 3

10:30 am - 8:58 pm

MKE

ONT

12h 28m

2 stops

5:00 am - 2:56 pm

ONT

MKE

7h 56m

1 stop

$342United Airlines

mar., feb. 10 - sáb., feb. 14

3:47 pm - 11:32 pm

MKE

ONT

9h 45m

1 stop

4:02 pm - 2:51 pm

ONT

MKE

20h 49m

1 stop

$343Alaska Airlines

jue., mar. 5 - mar., mar. 10

5:30 am - 11:31 am

MKE

ONT

8h 01m

1 stop

1:11 pm - 9:15 pm

ONT

MKE

6h 04m

1 stop

$347Delta

mar., feb. 3 - lun., feb. 9

3:20 pm - 10:53 pm

MKE

ONT

9h 33m

2 stops

5:00 am - 3:20 pm

ONT

MKE

8h 20m

2 stops

$348United Airlines

mar., feb. 10 - sáb., feb. 14

7:45 am - 12:16 pm

MKE

ONT

6h 31m

1 stop

1:15 pm - 11:47 pm

ONT

MKE

8h 32m

1 stop

$350Delta

mar., feb. 10 - jue., feb. 12

3:10 pm - 11:59 pm

MKE

ONT

10h 49m

1 stop

6:00 am - 2:14 pm

ONT

MKE

30h 14m

1 stop

$353Alaska Airlines

mié., abr. 15 - lun., abr. 20

7:45 am - 12:16 pm

MKE

ONT

6h 31m

1 stop

1:11 pm - 9:15 pm

ONT

MKE

6h 04m

1 stop

$357Delta

jue., feb. 5 - lun., feb. 9

Delta flights from Milwaukee to Ontario

Our best Delta deals on Milwaukee to Ontario flight tickets

Delta

Feb 10

MKE2:55 pmMilwaukee-Mitchell

8h 10m

1 stop

ONT9:05 pmOntario

Feb 11

ONT1:11 pmOntario

6h 04m

1 stop

MKE9:15 pmMilwaukee-Mitchell

$337

Delta

Feb 3

MKE5:30 amMilwaukee-Mitchell

8h 01m

1 stop

ONT11:31 amOntario

Feb 3

ONT10:30 pmOntario

8h 40m

1 stop

MKE9:10 amMilwaukee-Mitchell

$339

Delta

Feb 3

MKE5:30 amMilwaukee-Mitchell

8h 01m

1 stop

ONT11:31 amOntario

Feb 9

ONT1:11 pmOntario

6h 04m

1 stop

MKE9:15 pmMilwaukee-Mitchell

$347

United Airlines flights from Milwaukee to Ontario

Our best United Airlines deals on Milwaukee to Ontario flight tickets

United Airlines

Feb 10

MKE10:30 amMilwaukee-Mitchell

12h 28m

2 stops

ONT8:58 pmOntario

Feb 14

ONT5:00 amOntario

7h 56m

1 stop

MKE2:56 pmMilwaukee-Mitchell

$342

United Airlines

Feb 10

MKE3:20 pmMilwaukee-Mitchell

9h 33m

2 stops

ONT10:53 pmOntario

Feb 14

ONT5:00 amOntario

8h 20m

2 stops

MKE3:20 pmMilwaukee-Mitchell

$348

United Airlines

Feb 6

MKE4:05 pmMilwaukee-Mitchell

6h 53m

1 stop

ONT8:58 pmOntario

Feb 10

ONT1:24 pmOntario

5h 57m

1 stop

MKE9:21 pmMilwaukee-Mitchell

$366

Fly from

Fly to

Route

Depart

Return

Price

MilwaukeeOntario

MKE - ONT

MKEONT

Milwaukee-Mitchell

sáb. 5/2

7:00 am-2:32 pm

1 stop9h 32m

Ontario

mar. 5/12

3:26 pm-3:46 pm

1 stop22h 20m

$323

MilwaukeeOntario

MKE - ONT

MKEONT

Milwaukee-Mitchell

mar. 2/10

2:55 pm-9:05 pm

1 stop8h 10m

Ontario

mié. 2/11

1:11 pm-9:15 pm

1 stop6h 04m

$337

MilwaukeeOntario

MKE - ONT

MKEONT

Milwaukee-Mitchell

mar. 2/3

5:30 am-11:31 am

1 stop8h 01m

Ontario

mar. 2/3

10:30 pm-9:10 am

1 stop8h 40m

$339

MilwaukeeOntario

MKE - ONT

MKEONT

Milwaukee-Mitchell

mar. 2/10

10:30 am-8:58 pm

2 stops12h 28m

Ontario

sáb. 2/14

5:00 am-2:56 pm

1 stop7h 56m

$342

MilwaukeeOntario

MKE - ONT

MKEONT

Milwaukee-Mitchell

jue. 3/5

3:47 pm-11:32 pm

1 stop9h 45m

Ontario

mar. 3/10

4:02 pm-2:51 pm

1 stop20h 49m

$343

MilwaukeeOntario

MKE - ONT

MKEONT

Milwaukee-Mitchell

mar. 2/3

5:30 am-11:31 am

1 stop8h 01m

Ontario

lun. 2/9

1:11 pm-9:15 pm

1 stop6h 04m

$347

MilwaukeeOntario

MKE - ONT

MKEONT

Milwaukee-Mitchell

mar. 2/10

3:20 pm-10:53 pm

2 stops9h 33m

Ontario

sáb. 2/14

5:00 am-3:20 pm

2 stops8h 20m

$348

MilwaukeeOntario

MKE - ONT

MKEONT

Milwaukee-Mitchell

mar. 2/10

7:45 am-12:16 pm

1 stop6h 31m

Ontario

jue. 2/12

1:15 pm-11:47 pm

1 stop8h 32m

$350

MilwaukeeOntario

MKE - ONT

MKEONT

Milwaukee-Mitchell

mié. 4/15

3:10 pm-11:59 pm

1 stop10h 49m

Ontario

lun. 4/20

6:00 am-2:14 pm

1 stop30h 14m

$353

MilwaukeeOntario

MKE - ONT

MKEONT

Milwaukee-Mitchell

jue. 2/5

7:45 am-12:16 pm

1 stop6h 31m

Ontario

lun. 2/9

1:11 pm-9:15 pm

1 stop6h 04m

$357

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 40m
Direct flights	None

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

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 40m 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 11,129 reviews	Search American Airlines flights
Delta	PriceFrom $300	Free Cancellation	Rating 7.9 8,048 reviews	Search Delta flights
Southwest	PriceFrom $330	Free Cancellation	Rating 8.0 4,258 reviews	Search Southwest flights
United Airlines	PriceFrom $344	Free Cancellation	Rating 7.4 9,163 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.