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?

American Airlines, Alaska Airlines, 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.

$153 Cheap Flights from Milwaukee to Ontario in 2026

1 adult

0 bags

Discover deals from 900+ travel sites with momondo.

Save money when you book flights with momondo

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize your results.

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Not ready to book? to track prices.

Search flight deals

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.

3:47 pm - 11:32 pm

MKE

ONT

9h 45m

1 stop

6:15 am - 6:51 pm

ONT

MKE

10h 36m

1 stop

$272Multiple Airlines

Thu, Mar 5 - Mon, Mar 9

7:46 pm - 11:59 pm

MKE

ONT

6h 13m

1 stop

6:15 am - 6:51 pm

ONT

MKE

10h 36m

1 stop

$279Frontier

Mon, Mar 9 - Fri, Mar 13

3:47 pm - 11:32 pm

MKE

ONT

9h 45m

1 stop

6:14 am - 2:51 pm

ONT

MKE

30h 37m

1 stop

$285Alaska Airlines

Thu, Feb 26 - Wed, Mar 4

7:15 pm - 11:59 pm

MKE

ONT

6h 44m

1 stop

6:15 am - 6:51 pm

ONT

MKE

10h 36m

1 stop

$289Frontier

Mon, Mar 16 - Fri, Mar 20

3:47 pm - 10:44 pm

MKE

ONT

8h 57m

1 stop

6:14 am - 2:51 pm

ONT

MKE

30h 37m

1 stop

$294Alaska Airlines

Wed, Mar 4 - Tue, Mar 10

7:30 am - 12:07 pm

MKE

ONT

6h 37m

1 stop

1:15 pm - 11:47 pm

ONT

MKE

8h 32m

1 stop

$315Delta

Wed, Feb 25 - Wed, Mar 4

7:16 am - 4:22 pm

MKE

ONT

11h 06m

1 stop

12:18 pm - 10:57 pm

ONT

MKE

8h 39m

2 stops

$320American Airlines

Tue, Feb 17 - Tue, Feb 24

9:15 am - 6:24 pm

MKE

ONT

11h 09m

2 stops

7:35 pm - 7:45 am

ONT

MKE

10h 10m

2 stops

$326American Airlines

Wed, Apr 8 - Fri, Apr 24

5:30 am - 11:31 am

MKE

ONT

8h 01m

1 stop

1:15 pm - 11:47 pm

ONT

MKE

8h 32m

1 stop

$327Delta

Fri, Feb 6 - Thu, Mar 5

12:26 pm - 11:32 pm

MKE

ONT

13h 06m

2 stops

6:15 am - 6:51 pm

ONT

MKE

10h 36m

1 stop

$328Multiple Airlines

Thu, Mar 5 - Mon, Mar 9

Frontier flights from Milwaukee to Ontario

Our best Frontier deals on Milwaukee to Ontario flight tickets

Frontier

Mar 9

MKE7:46 pmMilwaukee-Mitchell

6h 13m

1 stop

ONT11:59 pmOntario

Mar 13

ONT6:15 amOntario

10h 36m

1 stop

MKE6:51 pmMilwaukee-Mitchell

$279

Frontier

Mar 16

MKE7:15 pmMilwaukee-Mitchell

6h 44m

1 stop

ONT11:59 pmOntario

Mar 20

ONT6:15 amOntario

10h 36m

1 stop

MKE6:51 pmMilwaukee-Mitchell

$289

Frontier

Mar 23

MKE7:15 pmMilwaukee-Mitchell

6h 44m

1 stop

ONT11:59 pmOntario

Mar 27

ONT6:15 amOntario

10h 36m

1 stop

MKE6:51 pmMilwaukee-Mitchell

$330

Delta flights from Milwaukee to Ontario

Our best Delta deals on Milwaukee to Ontario flight tickets

Delta

Feb 25

MKE5:23 amMilwaukee-Mitchell

8h 39m

1 stop

ONT12:02 pmOntario

Mar 6

ONT1:10 pmOntario

6h 22m

1 stop

MKE9:32 pmMilwaukee-Mitchell

$315

Delta

Feb 6

MKE5:30 amMilwaukee-Mitchell

8h 01m

1 stop

ONT11:31 amOntario

Mar 5

ONT1:15 pmOntario

8h 32m

1 stop

MKE11:47 pmMilwaukee-Mitchell

$327

Delta

Feb 6

MKE7:45 amMilwaukee-Mitchell

6h 31m

1 stop

ONT12:16 pmOntario

Feb 9

ONT1:11 pmOntario

6h 04m

1 stop

MKE9:15 pmMilwaukee-Mitchell

$338

Fly from

Fly to

Route

Depart

Return

Price

MilwaukeeOntario

MKE - ONT

MKEONT

Milwaukee-Mitchell

Thu 3/5

3:47 pm-11:32 pm

1 stop9h 45m

Ontario

Mon 3/9

6:15 am-6:51 pm

1 stop10h 36m

$272

MilwaukeeOntario

MKE - ONT

MKEONT

Milwaukee-Mitchell

Mon 3/9

7:46 pm-11:59 pm

1 stop6h 13m

Ontario

Fri 3/13

6:15 am-6:51 pm

1 stop10h 36m

$279

MilwaukeeOntario

MKE - ONT

MKEONT

Milwaukee-Mitchell

Thu 2/26

3:47 pm-11:32 pm

1 stop9h 45m

Ontario

Wed 3/4

6:14 am-2:51 pm

1 stop30h 37m

$285

MilwaukeeOntario

MKE - ONT

MKEONT

Milwaukee-Mitchell

Mon 3/16

7:15 pm-11:59 pm

1 stop6h 44m

Ontario

Fri 3/20

6:15 am-6:51 pm

1 stop10h 36m

$289

MilwaukeeOntario

MKE - ONT

MKEONT

Milwaukee-Mitchell

Wed 3/4

3:47 pm-10:44 pm

1 stop8h 57m

Ontario

Tue 3/10

6:14 am-2:51 pm

1 stop30h 37m

$294

MilwaukeeOntario

MKE - ONT

MKEONT

Milwaukee-Mitchell

Wed 2/25

7:30 am-12:07 pm

1 stop6h 37m

Ontario

Wed 3/4

1:15 pm-11:47 pm

1 stop8h 32m

$315

MilwaukeeOntario

MKE - ONT

MKEONT

Milwaukee-Mitchell

Tue 2/17

7:16 am-4:22 pm

1 stop11h 06m

Ontario

Tue 2/24

12:18 pm-10:57 pm

2 stops8h 39m

$320

MilwaukeeOntario

MKE - ONT

MKEONT

Milwaukee-Mitchell

Wed 4/8

9:15 am-6:24 pm

2 stops11h 09m

Ontario

Fri 4/24

7:35 pm-7:45 am

2 stops10h 10m

$326

MilwaukeeOntario

MKE - ONT

MKEONT

Milwaukee-Mitchell

Fri 2/6

5:30 am-11:31 am

1 stop8h 01m

Ontario

Thu 3/5

1:15 pm-11:47 pm

1 stop8h 32m

$327

MilwaukeeOntario

MKE - ONT

MKEONT

Milwaukee-Mitchell

Thu 3/5

12:26 pm-11:32 pm

2 stops13h 06m

Ontario

Mon 3/9

6:15 am-6:51 pm

1 stop10h 36m

$328

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	6h 13m
Direct flights	None

The fastest flight from Milwaukee to Ontario takes 6h 13m

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. 6h 13m 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 (10%).

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
Delta	PriceFrom $300	Free Cancellation	Rating 7.9 8,089 reviews	Search Delta flights
American Airlines	PriceFrom $324	Free Cancellation	Rating 7.2 11,174 reviews	Search American Airlines flights
Southwest	PriceFrom $330	Free Cancellation	Rating 8.0 4,266 reviews	Search Southwest flights
United Airlines	PriceFrom $344	Free Cancellation	Rating 7.4 9,191 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.