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Cheap flights from Ontario to Milwaukee from $160

1 adult
1 adult, Economy, 0 bags

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from Ontario to Milwaukee

Cheap round-trip flights

Enter your travel dates to find the best prices.
Frontier Logo
5:07 pm - 9:16 amONT  Ontario-MKE Milwaukee-Mitchell
14h 09m2 stops Las Vegas Harry Reid Intl Orlando
Frontier Logo
6:11 pm - 11:39 amMKE  Milwaukee-Mitchell-ONT Ontario
19h 28m2 stops Orlando Las Vegas Harry Reid Intl
$339Frontier
Wed, Nov 18 - Mon, Nov 23
Southwest Logo
5:00 pm - 12:15 amONT  Ontario-MKE Milwaukee-Mitchell
5h 15m1 stop Phoenix Sky Harbor Intl
Southwest Logo
5:10 am - 11:50 amMKE  Milwaukee-Mitchell-ONT Ontario
8h 40m1 stop Phoenix Sky Harbor Intl
$372Southwest
Wed, Dec 23 - Wed, Dec 30
Multiple Airlines Logo
6:25 am - 9:16 amONT  Ontario-MKE Milwaukee-Mitchell
24h 51m2 stops Denver Intl Orlando
Multiple Airlines Logo
6:58 pm - 11:16 amMKE  Milwaukee-Mitchell-ONT Ontario
18h 18m1 stop Las Vegas Harry Reid Intl
$373Multiple Airlines
Wed, Oct 28 - Thu, Oct 29
American Airlines Logo
10:25 am - 9:52 pmONT  Ontario-MKE Milwaukee-Mitchell
9h 27m1 stop Dallas/Fort Worth
American Airlines Logo
6:19 pm - 11:46 pmMKE  Milwaukee-Mitchell-ONT Ontario
7h 27m1 stop Dallas/Fort Worth
$377American Airlines
Wed, Oct 28 - Wed, Nov 4
United Airlines Logo
5:00 am - 1:34 pmONT  Ontario-MKE Milwaukee-Mitchell
6h 34m1 stop Denver Intl
United Airlines Logo
2:35 pm - 8:51 pmMKE  Milwaukee-Mitchell-ONT Ontario
8h 16m1 stop Denver Intl
$377United Airlines
Wed, Oct 28 - Thu, Oct 29
Delta Logo
1:35 pm - 9:56 pmONT  Ontario-MKE Milwaukee-Mitchell
6h 21m1 stop Salt Lake City
Delta Logo
5:30 am - 11:06 amMKE  Milwaukee-Mitchell-ONT Ontario
7h 36m1 stop Atlanta Hartsfield-Jackson
$377Delta
Sat, Oct 24 - Sat, Oct 31
Southwest Logo
5:35 am - 2:15 pmONT  Ontario-MKE Milwaukee-Mitchell
6h 40m1 stop Phoenix Sky Harbor Intl
Southwest Logo
5:15 am - 12:10 pmMKE  Milwaukee-Mitchell-ONT Ontario
8h 55m1 stop Phoenix Sky Harbor Intl
$377Southwest
Sat, Dec 12 - Mon, Dec 14
Southwest Logo
12:50 pm - 11:10 pmONT  Ontario-MKE Milwaukee-Mitchell
8h 20m1 stop Phoenix Sky Harbor Intl
Southwest Logo
5:00 am - 10:50 amMKE  Milwaukee-Mitchell-ONT Ontario
7h 50m1 stop Phoenix Sky Harbor Intl
$377Southwest
Mon, Dec 14 - Thu, Dec 17
American Airlines Logo
7:00 am - 5:38 pmONT  Ontario-MKE Milwaukee-Mitchell
8h 38m1 stop Dallas/Fort Worth
American Airlines Logo
1:38 pm - 6:51 pmMKE  Milwaukee-Mitchell-ONT Ontario
7h 13m1 stop Dallas/Fort Worth
$393American Airlines
Fri, Jan 1 - Wed, Jan 6
American Airlines Logo
7:00 am - 5:38 pmONT  Ontario-MKE Milwaukee-Mitchell
8h 38m1 stop Dallas/Fort Worth
American Airlines Logo
5:18 am - 12:39 pmMKE  Milwaukee-Mitchell-ONT Ontario
9h 21m2 stops Chicago O'Hare Intl Phoenix Sky Harbor Intl
$398American Airlines
Fri, Jan 1 - Wed, Jan 6

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Southwest flights from Ontario to Milwaukee

Our best Southwest deals on Ontario to Milwaukee flight tickets
Southwest
Dec 23
ONT5:00 pmOntario
5h 15m
1 stop
MKE12:15 amMilwaukee-Mitchell
Dec 30
MKE5:10 amMilwaukee-Mitchell
8h 40m
1 stop
ONT11:50 amOntario
$372
Southwest
Nov 11
ONT1:55 pmOntario
5h 55m
1 stop
MKE9:50 pmMilwaukee-Mitchell
Nov 12
MKE11:35 amMilwaukee-Mitchell
8h 55m
2 stops
ONT6:30 pmOntario
$382
Southwest
Nov 11
ONT1:30 pmOntario
7h 45m
2 stops
MKE11:15 pmMilwaukee-Mitchell
Nov 12
MKE11:35 amMilwaukee-Mitchell
8h 55m
2 stops
ONT6:30 pmOntario
$387

Delta flights from Ontario to Milwaukee

Our best Delta deals on Ontario to Milwaukee flight tickets
Delta
Oct 24
ONT1:35 pmOntario
6h 21m
1 stop
MKE9:56 pmMilwaukee-Mitchell
Oct 31
MKE5:30 amMilwaukee-Mitchell
7h 36m
1 stop
ONT11:06 amOntario
$377
Delta
Oct 24
ONT12:16 pmOntario
9h 37m
1 stop
MKE11:53 pmMilwaukee-Mitchell
Oct 31
MKE4:00 pmMilwaukee-Mitchell
8h 12m
2 stops
ONT10:12 pmOntario
$410
Delta
Oct 24
ONT12:16 pmOntario
9h 37m
1 stop
MKE11:53 pmMilwaukee-Mitchell
Oct 29
MKE5:30 amMilwaukee-Mitchell
7h 36m
1 stop
ONT11:06 amOntario
$418

momondo Fare Finder

 
Use the filters below to find and compare flights from Ontario to Milwaukee that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

OntarioMilwaukee

ONT Ontario - MKE Milwaukee-Mitchell

ONTMKE

Ontario

Wed 11/18

5:07 pm-9:16 am

2 stops14h 09m

Milwaukee-Mitchell

Mon 11/23

6:11 pm-11:39 am

2 stops19h 28m

$339
Quickest round-trip

OntarioMilwaukee

ONT Ontario - MKE Milwaukee-Mitchell

ONTMKE

Ontario

Wed 12/23

5:00 pm-12:15 am

1 stop5h 15m

Milwaukee-Mitchell

Wed 12/30

5:10 am-11:50 am

1 stop8h 40m

$372

OntarioMilwaukee

ONT Ontario - MKE Milwaukee-Mitchell

ONTMKE

Ontario

Wed 10/28

6:25 am-9:16 am

2 stops24h 51m

Milwaukee-Mitchell

Thu 10/29

6:58 pm-11:16 am

1 stop18h 18m

$373

OntarioMilwaukee

ONT Ontario - MKE Milwaukee-Mitchell

ONTMKE

Ontario

Wed 10/28

10:25 am-9:52 pm

1 stop9h 27m

Milwaukee-Mitchell

Wed 11/4

6:19 pm-11:46 pm

1 stop7h 27m

$377

OntarioMilwaukee

ONT Ontario - MKE Milwaukee-Mitchell

ONTMKE

Ontario

Wed 10/28

5:00 am-1:34 pm

1 stop6h 34m

Milwaukee-Mitchell

Thu 10/29

2:35 pm-8:51 pm

1 stop8h 16m

$377

OntarioMilwaukee

ONT Ontario - MKE Milwaukee-Mitchell

ONTMKE

Ontario

Sat 10/24

1:35 pm-9:56 pm

1 stop6h 21m

Milwaukee-Mitchell

Sat 10/31

5:30 am-11:06 am

1 stop7h 36m

$377

OntarioMilwaukee

ONT Ontario - MKE Milwaukee-Mitchell

ONTMKE

Ontario

Sat 12/12

5:35 am-2:15 pm

1 stop6h 40m

Milwaukee-Mitchell

Mon 12/14

5:15 am-12:10 pm

1 stop8h 55m

$377

OntarioMilwaukee

ONT Ontario - MKE Milwaukee-Mitchell

ONTMKE

Ontario

Mon 12/14

12:50 pm-11:10 pm

1 stop8h 20m

Milwaukee-Mitchell

Thu 12/17

5:00 am-10:50 am

1 stop7h 50m

$377

OntarioMilwaukee

ONT Ontario - MKE Milwaukee-Mitchell

ONTMKE

Ontario

Fri 1/1

7:00 am-5:38 pm

1 stop8h 38m

Milwaukee-Mitchell

Wed 1/6

1:38 pm-6:51 pm

1 stop7h 13m

$393

OntarioMilwaukee

ONT Ontario - MKE Milwaukee-Mitchell

ONTMKE

Ontario

Fri 1/1

7:00 am-5:38 pm

1 stop8h 38m

Milwaukee-Mitchell

Wed 1/6

5:18 am-12:39 pm

2 stops9h 21m

$398

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Milwaukee from

How to get the cheapest flight ticket from Ontario to Milwaukee

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

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

Prices are currently low for flights on this route.

Typical prices usually range from $439 to $527.
The lowest price recently found on this route was $339.

What is the cheapest month to fly to Milwaukee?

The cheapest month to fly to Milwaukee from Ontario is in November. Flight prices, which tend to average around $378, are often lower during this time because this is during the off-season. The month of February is another great option to travel to Milwaukee, with average flight prices from Ontario averaging around $426.

What is the cheapest day to depart on your flight to Milwaukee?

According to our data, Sunday is the cheapest day to fly to Milwaukee from Ontario. The lowest ticket price found for a Sunday departure recently was $169. Keep in mind that prices can always vary depending on your route and whether or not you are flying domestic or international. Flights from Ontario to Milwaukee on a Thursday will generally be more expensive and average around $181. Keep in mind that these prices on both days could fluctuate depending on the season and the demand.

How have Ontario to Milwaukee flight prices changed over time?

As of September 2026, prices for Ontario to Milwaukee flights are approximately 71% more expensive when compared to flights at the same time last year.

When to book flights from Ontario to Milwaukee

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

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

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

Best Price Found

$160

Fastest flight time

5h 49m

Direct flights

None
The best one-way flight to Milwaukee from Ontario in the past 72 hours is $160. The best round-trip flight deal from Ontario to Milwaukee found on momondo in the last 72 hours is $339.
The fastest flight from Ontario to Milwaukee takes 5h 49m
There are no direct flights from Ontario to Milwaukee. There are no popular flight routes from Ontario to Milwaukee.
Search flight deals

Frequently asked questions about flying from Ontario to Milwaukee

  • How far is Ontario to Milwaukee-Mitchell by plane?

    The straight-line distance from Ontario to Milwaukee-Mitchell is 1710.4 mi. Flights usually cover this in 5h 49m, depending on flying conditions and air traffic around both airports.

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

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

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

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

    Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Ontario Airport to Milwaukee-Mitchell Airport.

  • What documentation or ID do you need to fly to Milwaukee-Mitchell Airport?

    The travel and health documents required for your trip to Milwaukee-Mitchell 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 Milwaukee-Mitchell 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 Ontario to Milwaukee?

Best airlines flying from Ontario to Milwaukee

Compare and see reviews for airlines that fly from Ontario to Milwaukee with momondo
Airline
Rating
Free Cancellation
Price
SouthwestPriceFrom $354Free CancellationRating
8.0
4,202 reviews
Search Southwest flights
American AirlinesPriceFrom $366Free CancellationRating
7.0
12,097 reviews
Search American Airlines flights

Traveling to a place near Milwaukee?

Book flights to Milwaukee if you plan to visit one of these locations
Sheboygan
Waukesha
Oak Creek
Mequon
Wauwatosa
Glendale
West Bend
Kohler
Port Washington
Pewaukee
New Berlin
Grafton

Why use momondo?

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

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from Ontario to Milwaukee. momondo saves you time and could save you money on your trip.

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

Yes. momondo allows you to filter the results for Ontario to Milwaukee flights to just show those with flexible booking policies.

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

momondo provides multiple filters to help you find the best flight to Milwaukee from Ontario. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.

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

Price alerts on flights to Milwaukee from Ontario are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.

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