$169+ Cheap flights from Ontario to Milwaukee (ONT - MKE)
This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 12/3. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — MKE
Oct 1 — Oct 81
Round-trip
1 adult, Economy
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Find cheap flights from Ontario to Milwaukee with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheap flight deals from Ontario to Milwaukee
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Cheapest flights from Ontario to MilwaukeeExplore the most affordable flight options available from Ontario to Milwaukee. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 1, 2026.
Explore the most affordable flight options available from Ontario to Milwaukee. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 1, 2026.
This Delta deal was found by Cheapflights users on 9/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/141:35 pm -
1 stop6h 21m
Thu 10/152:59 pm -
1 stop8h 55m
Deal found 9/1![Delta logo]()
$337
This Southwest deal was found by Cheapflights users on 8/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/294:15 pm -
1 stop6h 00m
Sat 10/316:25 am -
2 stops8h 20m
Deal found 8/29![Southwest logo]()
$342
This Delta deal was found by Cheapflights users on 8/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/66:00 pm -
2 stops14h 09m
Tue 10/135:30 am -
2 stops12h 53m
Deal found 8/30![Delta logo]()
$347
This Southwest deal was found by Cheapflights users on 8/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/24:15 pm -
1 stop5h 55m
Mon 10/57:35 pm -
1 stop6h 20m
Deal found 8/28![Southwest logo]()
$353
This Southwest deal was found by Cheapflights users on 8/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/301:05 pm -
2 stops7h 30m
Mon 11/25:00 am -
2 stops10h 00m
Deal found 8/31![Southwest logo]()
$363
This Southwest deal was found by Cheapflights users on 8/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/611:55 pm -
1 stop9h 10m
Tue 10/134:00 pm -
2 stops7h 45m
Deal found 8/30![Southwest logo]()
$364
This Alaska Airlines deal was found by Cheapflights users on 8/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/276:02 am -
1 stop8h 17m
Mon 11/24:31 pm -
1 stop8h 35m
Deal found 8/30![Alaska Airlines logo]()
$369
This Delta deal was found by Cheapflights users on 8/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/111:15 pm -
1 stop6h 40m
Sun 11/155:20 am -
1 stop7h 48m
Deal found 8/27![Delta logo]()
$375
This Southwest deal was found by Cheapflights users on 8/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/111:30 pm -
2 stops7h 40m
Sun 11/155:00 am -
1 stop7h 50m
Deal found 8/27![Southwest logo]()
$380
This Southwest deal was found by Cheapflights users on 9/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/267:25 am -
1 stop5h 30m
Tue 12/15:15 am -
1 stop6h 05m
Deal found 9/1![Southwest logo]()
$383
This Southwest deal was found by Cheapflights users on 8/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/291:30 pm -
2 stops7h 20m
Sun 11/15:50 am -
2 stops9h 10m
Deal found 8/31![Southwest logo]()
$385
Best flights from Ontario to MilwaukeeDiscover carefully curated flight deals from Ontario to Milwaukee that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 1, 2026.
Discover carefully curated flight deals from Ontario to Milwaukee that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 1, 2026.
This Delta deal was found by Cheapflights users on 8/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/141:35 pm -
1 stop6h 21m
Fri 10/164:29 pm -
1 stop7h 40m
Deal found 8/28![Delta logo]()
$353
This Southwest deal was found by Cheapflights users on 8/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/169:40 am -
2 stops8h 20m
Wed 9/236:20 am -
1 stop5h 55m
Deal found 8/30![Southwest logo]()
$430
This United Airlines deal was found by Cheapflights users on 8/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/105:00 am -
1 stop6h 34m
Wed 11/112:35 pm -
1 stop8h 16m
Deal found 8/31![United Airlines logo]()
$437
This Delta deal was found by Cheapflights users on 8/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/227:05 am -
1 stop8h 26m
Wed 9/237:30 am -
1 stop6h 44m
Deal found 8/27![Delta logo]()
$375
This Southwest deal was found by Cheapflights users on 9/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/267:25 am -
2 stops7h 25m
Tue 12/112:45 pm -
2 stops9h 50m
Deal found 9/1![Southwest logo]()
$439
This Delta deal was found by Cheapflights users on 8/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/1112:17 pm -
1 stop7h 13m
Sun 9/134:46 pm -
1 stop7h 38m
Deal found 8/27![Delta logo]()
$413
Last-minute flights from Ontario to MilwaukeeDiscover last-minute flight deals from Ontario to Milwaukee. Data last updated September 1, 2026 and is based on user searches.
Discover last-minute flight deals from Ontario to Milwaukee. Data last updated September 1, 2026 and is based on user searches.
This Delta deal was found by Cheapflights users on 8/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/107:05 am -
1 stop8h 26m
Sun 9/134:46 pm -
1 stop7h 38m
Deal found 8/28![Delta logo]()
$446
This Delta deal was found by Cheapflights users on 8/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/1112:17 pm -
1 stop7h 13m
Sun 9/134:46 pm -
1 stop7h 38m
Deal found 8/27![Delta logo]()
$413
This United Airlines deal was found by Cheapflights users on 8/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/111:18 pm -
1 stop5h 45m
Tue 9/155:00 am -
2 stops11h 01m
Deal found 8/27![United Airlines logo]()
$418
This Delta deal was found by Cheapflights users on 8/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/116:00 pm -
2 stops14h 04m
Tue 9/154:57 pm -
2 stops8h 50m
Deal found 8/27![Delta logo]()
$456
This United Airlines deal was found by Cheapflights users on 8/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/126:08 am -
2 stops9h 22m
Sat 10/32:20 pm -
2 stops8h 38m
Deal found 8/28![United Airlines logo]()
$385
This Southwest deal was found by Cheapflights users on 8/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/169:40 am -
2 stops8h 20m
Wed 9/236:20 am -
1 stop5h 55m
Deal found 8/30![Southwest logo]()
$430
This KAYAK deal was found by Cheapflights users on 8/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/2010:00 pm -
1 stop9h 06m
Tue 9/2212:44 pm -
1 stop9h 40m
Deal found 8/27![Delta logo]()
$457
This Delta deal was found by Cheapflights users on 8/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/227:05 am -
1 stop8h 26m
Wed 9/237:30 am -
1 stop6h 44m
Deal found 8/27![Delta logo]()
$375
This Delta deal was found by Cheapflights users on 8/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/2412:19 pm -
1 stop9h 29m
Thu 10/14:49 pm -
1 stop7h 35m
Deal found 8/27![Delta logo]()
$337
One-way flights from Ontario to MilwaukeeSearch for one-way flight options from Ontario to Milwaukee. Find affordable one-way fares based on user searches. Data last updated September 1, 2026.
Search for one-way flight options from Ontario to Milwaukee. Find affordable one-way fares based on user searches. Data last updated September 1, 2026.
This American Airlines deal was found by Cheapflights users on 8/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/3010:25 am -
1 stop9h 23m
Deal found 8/28![American Airlines logo]()
$169
This Delta deal was found by Cheapflights users on 8/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/306:00 pm -
2 stops13h 18m
Deal found 8/28![Delta logo]()
$174
This Delta deal was found by Cheapflights users on 8/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/3012:16 pm -
1 stop9h 37m
Deal found 8/28![Delta logo]()
$185
This Southwest deal was found by Cheapflights users on 9/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/255:00 pm -
1 stop5h 15m
Deal found 9/1![Southwest logo]()
$202
This American Airlines deal was found by Cheapflights users on 8/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/246:30 am -
1 stop5h 29m
Deal found 8/30![American Airlines logo]()
$206
This Delta deal was found by Cheapflights users on 8/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/2010:00 pm -
1 stop9h 06m
Deal found 8/28![Delta logo]()
$207
This United Airlines deal was found by Cheapflights users on 8/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/86:00 am -
1 stop9h 09m
Deal found 8/30![United Airlines logo]()
$214
This Delta deal was found by Cheapflights users on 8/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/126:01 pm -
2 stops12h 38m
Deal found 8/27![Delta logo]()
$215
This Delta deal was found by Cheapflights users on 8/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/86:00 pm -
2 stops13h 18m
Deal found 8/30![Delta logo]()
$219
This KAYAK deal was found by Cheapflights users on 8/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/812:16 pm -
1 stop9h 37m
Deal found 8/28![Delta logo]()
$222
Find flight deals from Ontario to Milwaukee
Discover tips and strategies to find the most affordable flight options for your journey from Ontario (ONT) to Milwaukee (MKE). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated September 1, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $337 (Delta) |
One-way from | $169 (Delta) |
Popular in | June |
Cheapest in | November |
Average price | $412 |
Cheapflights 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, Cheapflights users made 7,457,451 searches. Data last updated September 1, 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
Cheapest round-trip
Quickest round-trip
OntarioMilwaukee
ONT Ontario - MKE Milwaukee-Mitchell
ONTMKE
Ontario
Wed 10/14
1:35 pm-9:56 pm
1 stop6h 21m
Milwaukee-Mitchell
Fri 10/16
4:29 pm-10:09 pm
1 stop7h 40m
$353
OntarioMilwaukee
ONT Ontario - MKE Milwaukee-Mitchell
ONTMKE
Ontario
Tue 9/22
7:05 am-5:31 pm
1 stop8h 26m
Milwaukee-Mitchell
Wed 9/23
7:30 am-12:14 pm
1 stop6h 44m
$375
OntarioMilwaukee
ONT Ontario - MKE Milwaukee-Mitchell
ONTMKE
Ontario
Fri 9/11
12:17 pm-9:30 pm
1 stop7h 13m
Milwaukee-Mitchell
Sun 9/13
4:46 pm-10:24 pm
1 stop7h 38m
$413
OntarioMilwaukee
ONT Ontario - MKE Milwaukee-Mitchell
ONTMKE
Ontario
Wed 9/16
9:40 am-8:00 pm
2 stops8h 20m
Milwaukee-Mitchell
Wed 9/23
6:20 am-10:15 am
1 stop5h 55m
$430
OntarioMilwaukee
ONT Ontario - MKE Milwaukee-Mitchell
ONTMKE
Ontario
Tue 11/10
5:00 am-1:34 pm
1 stop6h 34m
Milwaukee-Mitchell
Wed 11/11
2:35 pm-8:51 pm
1 stop8h 16m
$437
OntarioMilwaukee
ONT Ontario - MKE Milwaukee-Mitchell
ONTMKE
Ontario
Thu 11/26
7:25 am-4:50 pm
2 stops7h 25m
Milwaukee-Mitchell
Tue 12/1
12:45 pm-8:35 pm
2 stops9h 50m
$439
Cheapest one-way
OntarioMilwaukee
ONT Ontario - MKE Milwaukee-Mitchell
ONTMKE
Ontario
Thu 12/3
11:08 pm-9:13 am
1 stop8h 05m
$169
OntarioMilwaukee
ONT Ontario - MKE Milwaukee-Mitchell
ONTMKE
Ontario
Wed 9/30
7:20 am-4:53 pm
1 stop7h 33m
$169
Quickest one-way
OntarioMilwaukee
ONT Ontario - MKE Milwaukee-Mitchell
ONTMKE
Ontario
Sat 9/19
1:04 pm-9:11 pm
1 stop6h 07m
$169
OntarioMilwaukee
ONT Ontario - MKE Milwaukee-Mitchell
ONTMKE
Ontario
Fri 10/30
12:16 pm-11:53 pm
1 stop9h 37m
$185
Showing 1-10 of 11 resultsSorted by cheapest first
Compare providers for flights from Ontario to Milwaukee
Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Ontario to Milwaukee in September.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy- | Trust Score*1 star |
- Most accurate provider: When it comes to deals on Ontario-Milwaukee flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Ontario-Milwaukee flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Ontario-Milwaukee flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on Ontario-Milwaukee flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Ontario-Milwaukee flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.
Best time to book a flight from Ontario to Milwaukee
Have a flexible travel schedule? Discover the best time to fly to Milwaukee from Ontario with our price prediction graph.
ONT-MKE
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.
Cheapflights Insights
Everything you need to know about your flight from Ontario to Milwaukee
What is the cheapest month to book a flight from Ontario to Milwaukee?
Currently, November is the cheapest month in which you can book a flight from Ontario to Milwaukee (average of $378). Flying from Ontario to Milwaukee in June is currently the most expensive (average of $596). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.
How much does it cost to fly round-trip from Ontario to Milwaukee?
Airfare is below average for this route at the moment.
Ontario to Milwaukee flights typically cost between $366 and $561 in October.The cheapest round-trip price found within the last 5 days was $337 on Delta (Oct 14-Oct 15).
Reviews of airlines servicing Milwaukee
Get insights into the airlines that provide service to Milwaukee. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Milwaukee. Reviews last updated September 1, 2026.
Read reviews from past customers who have flown Southwest,United Airlines, andAmerican Airlines from Ontario to Milwaukee. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Boarding
8.1
Overall
8.0
Crew
8.6
Comfort
8.0
Entertainment
7.5
Food
7.0
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Boarding
8.1
Overall
8.0
Crew
8.6
Comfort
8.0
Entertainment
7.5
Food
7.0
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Boarding
8.1
Overall
8.0
Crew
8.6
Comfort
8.0
Entertainment
7.5
Food
7.0
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Boarding
8.1
Overall
8.0
Crew
8.6
Comfort
8.0
Entertainment
7.5
Food
7.0
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Related info for your journey
Find useful and relevant information for your journey from Ontario to Milwaukee. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
Traveling to a place near Milwaukee?
Book flights to Milwaukee if you plan to visit one of these locationsPort Washington
Sheboygan
New Berlin
Oak Creek
Wauwatosa
Browse thousands of different options on Cheapflights for your next trip
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Complete your trip
Complete your trip to Milwaukee by adding a car rental and/or hotel reservation to your travel itinerary.
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Find flights from Ontario to Milwaukee, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Other flights to Milwaukee
Explore flights to Milwaukee departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on September 1, 2026.
Ontario and Milwaukee flights
Browse other Ontario and Milwaukee flight options. Last updated on September 1, 2026.
Other flights from Ontario
Browse through other flights departing from Ontario. Flights are based on user searches made on Cheapflights and were last updated on September 1, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Top 3 airlines flying from Ontario to Milwaukee
Discover the top 3 airlines that operate flights from Ontario to Milwaukee. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 7,457,451 searches. Data last updated September 1, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$309 | Average$426 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$354 | Average$496 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$366 | Average$448 | FlexibilityNo cancel fee | On-time71% |