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Cheap flights from Ontario to Milwaukee from $121

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Ontario to Milwaukee departing on 3/5. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

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Find the cheapest flights from Ontario to Milwaukee

Cheap round-trip flights

Enter your travel dates to find the best prices.
Frontier Logo
3:30 pm - 1:02 pm
ONT
-
MKE
19h 32m
1 stop
Frontier Logo
1:57 pm - 3:57 pm
MKE
-
ONT
28h 00m
1 stop
$215Frontier
Mon, Mar 23 - Tue, Mar 31
Frontier Logo
5:33 pm - 6:59 pm
ONT
-
MKE
23h 26m
1 stop
Frontier Logo
7:37 pm - 11:55 pm
MKE
-
ONT
6h 18m
1 stop
$222Frontier
Thu, Apr 16 - Mon, Apr 20
Frontier Logo
2:08 pm - 6:51 pm
ONT
-
MKE
26h 43m
1 stop
Frontier Logo
7:46 pm - 11:59 pm
MKE
-
ONT
6h 13m
1 stop
$229Frontier
Thu, Mar 5 - Mon, Mar 9
United Airlines Logo
1:50 pm - 9:21 pm
ONT
-
MKE
5h 31m
1 stop
United Airlines Logo
2:54 pm - 10:18 pm
MKE
-
ONT
9h 24m
1 stop
$257United Airlines
Sat, Mar 7 - Sat, Mar 14
United Airlines Logo
5:10 am - 2:27 pm
ONT
-
MKE
7h 17m
1 stop
United Airlines Logo
10:45 am - 6:02 pm
MKE
-
ONT
9h 17m
2 stops
$262United Airlines
Wed, Apr 15 - Tue, Apr 21
United Airlines Logo
11:05 am - 10:15 pm
ONT
-
MKE
9h 10m
2 stops
United Airlines Logo
9:43 am - 6:02 pm
MKE
-
ONT
10h 19m
2 stops
$267United Airlines
Wed, Apr 15 - Tue, Apr 21
Frontier Logo
6:15 am - 6:51 pm
ONT
-
MKE
10h 36m
1 stop
Frontier Logo
7:46 pm - 11:59 pm
MKE
-
ONT
6h 13m
1 stop
$268Frontier
Fri, Mar 6 - Mon, Mar 9
Delta Logo
12:10 pm - 11:59 pm
ONT
-
MKE
9h 49m
1 stop
Delta Logo
2:55 pm - 9:54 pm
MKE
-
ONT
8h 59m
1 stop
$277Delta
Sat, May 16 - Tue, May 19
Frontier Logo
5:33 pm - 6:59 pm
ONT
-
MKE
23h 26m
1 stop
Frontier Logo
7:37 pm - 11:55 pm
MKE
-
ONT
6h 18m
1 stop
$286Frontier
Thu, Apr 16 - Mon, Apr 20
United Airlines Logo
5:00 am - 2:57 pm
ONT
-
MKE
7h 57m
1 stop
United Airlines Logo
2:54 pm - 10:18 pm
MKE
-
ONT
9h 24m
1 stop
$297United Airlines
Wed, Mar 4 - Thu, Mar 5

United Airlines flights from Ontario to Milwaukee

Our best United Airlines deals on Ontario to Milwaukee flight tickets
United Airlines
Mar 7
ONT1:50 pmOntario
5h 31m
1 stop
MKE9:21 pmMilwaukee-Mitchell
Mar 14
MKE2:54 pmMilwaukee-Mitchell
9h 24m
1 stop
ONT10:18 pmOntario
$257
United Airlines
Apr 15
ONT5:10 amOntario
7h 17m
1 stop
MKE2:27 pmMilwaukee-Mitchell
Apr 21
MKE10:45 amMilwaukee-Mitchell
9h 17m
2 stops
ONT6:02 pmOntario
$262
United Airlines
Apr 15
ONT11:05 amOntario
9h 10m
2 stops
MKE10:15 pmMilwaukee-Mitchell
Apr 21
MKE9:43 amMilwaukee-Mitchell
10h 19m
2 stops
ONT6:02 pmOntario
$267

Delta flights from Ontario to Milwaukee

Our best Delta deals on Ontario to Milwaukee flight tickets
Delta
May 16
ONT12:10 pmOntario
9h 49m
1 stop
MKE11:59 pmMilwaukee-Mitchell
May 19
MKE2:55 pmMilwaukee-Mitchell
8h 59m
1 stop
ONT9:54 pmOntario
$277
Delta
Mar 9
ONT10:25 pmOntario
8h 39m
1 stop
MKE9:04 amMilwaukee-Mitchell
Mar 17
MKE5:45 amMilwaukee-Mitchell
8h 02m
1 stop
ONT11:47 amOntario
$309
Delta
May 14
ONT1:25 pmOntario
6h 08m
1 stop
MKE9:33 pmMilwaukee-Mitchell
May 19
MKE2:55 pmMilwaukee-Mitchell
8h 59m
1 stop
ONT9:54 pmOntario
$320

momondo Fare Finder

 
Customize your flight search to find flights from Ontario to Milwaukee that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 832,500 searches. Data last updated February 9, 2026.
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

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Mon 3/23

3:30 pm-1:02 pm

1 stop19h 32m

Milwaukee-Mitchell

Tue 3/31

1:57 pm-3:57 pm

1 stop28h 00m

$215

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Thu 4/16

5:33 pm-6:59 pm

1 stop23h 26m

Milwaukee-Mitchell

Mon 4/20

7:37 pm-11:55 pm

1 stop6h 18m

$222

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Thu 3/5

2:08 pm-6:51 pm

1 stop26h 43m

Milwaukee-Mitchell

Mon 3/9

7:46 pm-11:59 pm

1 stop6h 13m

$229

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Sat 3/7

1:50 pm-9:21 pm

1 stop5h 31m

Milwaukee-Mitchell

Sat 3/14

2:54 pm-10:18 pm

1 stop9h 24m

$257

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Wed 4/15

5:10 am-2:27 pm

1 stop7h 17m

Milwaukee-Mitchell

Tue 4/21

10:45 am-6:02 pm

2 stops9h 17m

$262

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Wed 4/15

11:05 am-10:15 pm

2 stops9h 10m

Milwaukee-Mitchell

Tue 4/21

9:43 am-6:02 pm

2 stops10h 19m

$267

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Fri 3/6

6:15 am-6:51 pm

1 stop10h 36m

Milwaukee-Mitchell

Mon 3/9

7:46 pm-11:59 pm

1 stop6h 13m

$268

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Sat 5/16

12:10 pm-11:59 pm

1 stop9h 49m

Milwaukee-Mitchell

Tue 5/19

2:55 pm-9:54 pm

1 stop8h 59m

$277

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Thu 4/16

5:33 pm-6:59 pm

1 stop23h 26m

Milwaukee-Mitchell

Mon 4/20

7:37 pm-11:55 pm

1 stop6h 18m

$286

OntarioMilwaukee

ONT - MKE

ONTMKE

Ontario

Wed 3/4

5:00 am-2:57 pm

1 stop7h 57m

Milwaukee-Mitchell

Thu 3/5

2:54 pm-10:18 pm

1 stop9h 24m

$297

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 cheapest month to fly to Milwaukee?

The cheapest month to fly to Milwaukee from Ontario is in September. Flight prices, which tend to average around $366, are often lower during this time because this is during the off-season. The month of May is another great option to travel to Milwaukee, with average flight prices from Ontario averaging around $374.

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

According to our data, Thursday is the cheapest day to fly to Milwaukee from Ontario. The lowest ticket price found for a Thursday departure recently was $181. 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 Sunday will generally be more expensive and average around $189. 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 February 2026, prices for Ontario to Milwaukee flights are approximately 73% 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

Fastest flight time

6h 22m

Direct flights

None
The fastest flight from Ontario to Milwaukee takes 6h 22m
There are no direct flights from Ontario to Milwaukee. There are no popular flight routes from Ontario to Milwaukee.
Search flight deals

  • 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 6h 22m, 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
DeltaPriceFrom $253Free CancellationRating
7.9
8,174 reviews
Search Delta flights
American AirlinesPriceFrom $276Free CancellationRating
7.2
11,258 reviews
Search American Airlines flights
United AirlinesPriceFrom $309Free CancellationRating
7.4
9,259 reviews
Search United Airlines flights
SouthwestPriceFrom $326Free CancellationRating
8.0
4,282 reviews
Search Southwest flights

Traveling to a place near Milwaukee?

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