$140+ Cheap flights from Ontario to Milwaukee (ONT - MKE)
This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 11/16. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — MKE
Nov 25 — Dec 21
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
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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 October 26, 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 October 26, 2026.
This Southwest deal was found by Cheapflights users on 10/22. 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 12/105:45 am -
1 stop7h 10m
Sat 2/205:40 am -
1 stop8h 45m
Deal found 10/22![Southwest logo]()
$279
This Delta deal was found by Cheapflights users on 10/22. 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 11/157:30 am -
1 stop6h 47m
Deal found 10/22![Delta logo]()
$336
This Delta deal was found by Cheapflights users on 10/21. 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 12/241:15 pm -
1 stop6h 26m
Tue 12/295:50 pm -
1 stop7h 51m
Deal found 10/21![Delta logo]()
$366
This Delta deal was found by Cheapflights users on 10/21. 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 12/241:15 pm -
1 stop6h 26m
Fri 12/257:10 am -
1 stop7h 12m
Deal found 10/21![Delta logo]()
$369
This Delta deal was found by Cheapflights users on 10/25. 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 11/181:15 pm -
1 stop6h 40m
Fri 12/412:53 pm -
1 stop7h 45m
Deal found 10/25![Delta logo]()
$376
This Alaska Airlines deal was found by Cheapflights users on 10/25. 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.
Thu 11/196:00 am -
1 stop7h 42m
Thu 12/34:25 pm -
1 stop8h 34m
Deal found 10/25![Alaska Airlines logo]()
$393
This United Airlines deal was found by Cheapflights users on 10/21. 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 11/106:00 am -
1 stop7h 15m
Wed 11/112:35 pm -
1 stop8h 16m
Deal found 10/21![United Airlines logo]()
$399
This Alaska Airlines deal was found by Cheapflights users on 10/22. 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.
Fri 12/256:00 am -
1 stop7h 33m
Mon 1/44:27 pm -
1 stop9h 32m
Deal found 10/22![Alaska Airlines logo]()
$407
This American Airlines deal was found by Cheapflights users on 10/22. 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 11/119:50 am -
2 stops10h 06m
Sun 11/157:05 am -
1 stop8h 26m
Deal found 10/22![American Airlines logo]()
$408
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 October 26, 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 October 26, 2026.
This Southwest deal was found by Cheapflights users on 10/22. 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 12/105:45 am -
1 stop7h 10m
Sat 2/205:40 am -
1 stop8h 45m
Deal found 10/22![Southwest logo]()
$279
This United Airlines deal was found by Cheapflights users on 10/23. 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 -
2 stops10h 43m
Wed 11/112:35 pm -
1 stop8h 16m
Deal found 10/23![United Airlines logo]()
$404
This Alaska Airlines deal was found by Cheapflights users on 10/26. 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.
Fri 1/16:00 am -
1 stop7h 33m
Thu 1/73:25 pm -
1 stop9h 16m
Deal found 10/26![Alaska Airlines logo]()
$411
This Delta deal was found by Cheapflights users on 10/22. 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 12/2411:10 am -
1 stop7h 17m
Tue 12/295:50 pm -
1 stop7h 51m
Deal found 10/22![Delta logo]()
$419
This Alaska Airlines deal was found by Cheapflights users on 10/26. 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.
Fri 1/16:00 am -
1 stop7h 33m
Wed 1/63:25 pm -
1 stop9h 16m
Deal found 10/26![Alaska Airlines logo]()
$429
This Alaska Airlines deal was found by Cheapflights users on 10/26. 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.
Wed 12/306:00 am -
1 stop7h 29m
Wed 1/63:25 pm -
1 stop9h 16m
Deal found 10/26![Alaska Airlines logo]()
$429
This Alaska Airlines deal was found by Cheapflights users on 10/25. 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 12/296:00 am -
1 stop7h 29m
Wed 1/63:25 pm -
1 stop9h 16m
Deal found 10/25![Alaska Airlines logo]()
$429
This Alaska Airlines deal was found by Cheapflights users on 10/24. 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 12/156:00 am -
1 stop7h 27m
Tue 12/224:27 pm -
1 stop9h 32m
Deal found 10/24![Alaska Airlines logo]()
$429
Last-minute flights from Ontario to MilwaukeeDiscover last-minute flight deals from Ontario to Milwaukee. Data last updated October 26, 2026 and is based on user searches.
Discover last-minute flight deals from Ontario to Milwaukee. Data last updated October 26, 2026 and is based on user searches.
This United Airlines deal was found by Cheapflights users on 10/21. 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 11/106:00 am -
1 stop7h 15m
Wed 11/112:35 pm -
1 stop8h 16m
Deal found 10/21![United Airlines logo]()
$399
This Delta deal was found by Cheapflights users on 10/22. 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 11/157:30 am -
1 stop6h 47m
Deal found 10/22![Delta logo]()
$336
This American Airlines deal was found by Cheapflights users on 10/22. 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 11/119:50 am -
2 stops10h 06m
Sun 11/157:05 am -
1 stop8h 26m
Deal found 10/22![American Airlines logo]()
$408
This United Airlines deal was found by Cheapflights users on 10/22. 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.
Thu 11/125:00 am -
1 stop6h 34m
Fri 11/132:35 pm -
1 stop8h 16m
Deal found 10/22![United Airlines logo]()
$437
This Delta deal was found by Cheapflights users on 10/25. 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 11/181:15 pm -
1 stop6h 40m
Fri 12/412:53 pm -
1 stop7h 45m
Deal found 10/25![Delta logo]()
$376
This Alaska Airlines deal was found by Cheapflights users on 10/25. 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.
Thu 11/196:00 am -
1 stop7h 42m
Thu 12/34:25 pm -
1 stop8h 34m
Deal found 10/25![Alaska Airlines logo]()
$393
This Delta deal was found by Cheapflights users on 10/23. 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 11/191:15 pm -
1 stop6h 40m
Thu 11/265:20 am -
1 stop7h 43m
Deal found 10/23![Delta logo]()
$429
This American Airlines deal was found by Cheapflights users on 10/23. 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.
Thu 11/197:45 pm -
2 stops10h 11m
Thu 11/267:00 am -
2 stops12h 13m
Deal found 10/23![American Airlines logo]()
$433
This Alaska Airlines deal was found by Cheapflights users on 10/25. 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.
Sun 11/226:00 am -
1 stop7h 35m
Fri 12/44:25 pm -
1 stop8h 34m
Deal found 10/25![Alaska Airlines logo]()
$431
This Alaska Airlines deal was found by Cheapflights users on 10/25. 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.
Mon 11/236:00 am -
1 stop7h 35m
Fri 12/44:25 pm -
1 stop8h 34m
Deal found 10/25![Alaska Airlines logo]()
$411
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 October 26, 2026.
Search for one-way flight options from Ontario to Milwaukee. Find affordable one-way fares based on user searches. Data last updated October 26, 2026.
This Delta deal was found by Cheapflights users on 10/21. 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 11/1611:10 pm -
1 stop8h 05m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/21![Delta logo]()
$140
This Mytrip deal was found by Cheapflights users on 10/23. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/179:00 am -
2 stops12h 46m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/23![Multiple Airlines logo]()
$146
This Southwest deal was found by Cheapflights users on 10/22. 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 12/11:30 pm -
2 stops7h 45m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/22![Southwest logo]()
$152
This Delta deal was found by Cheapflights users on 10/22. 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 11/1311:10 pm -
1 stop8h 00m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/22![Delta logo]()
$178
This Delta deal was found by Cheapflights users on 10/22. 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 12/2110:35 pm -
1 stop8h 49m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/22![Delta logo]()
$180
This Kiwi.com deal was found by Cheapflights users on 10/25. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/236:45 am -
2 stops32h 41m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/25![Frontier logo]()
$185
This Mytrip deal was found by Cheapflights users on 10/23. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/167:26 pm -
3 stops26h 20m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/23![Multiple Airlines logo]()
$187
This Delta deal was found by Cheapflights users on 10/26. 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 12/157:05 am -
1 stop8h 33m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/26![Delta logo]()
$197
This Priceline deal was found by Cheapflights users on 10/21. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/1711:55 am -
1 stop10h 04m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/21![Alaska Airlines logo]()
$200
This Delta deal was found by Cheapflights users on 10/22. 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 11/3011:10 pm -
1 stop8h 03m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/22![Delta logo]()
$202
This United Airlines deal was found by Cheapflights users on 10/21. 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 -
2 stops11h 58m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/21![United Airlines logo]()
$205
This Alaska Airlines deal was found by Cheapflights users on 10/23. 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.
Fri 1/16:00 am -
1 stop7h 33m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/23![Alaska Airlines logo]()
$208
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 October 26, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $279 (Southwest) |
One-way from | $140 (Delta) |
Popular in | June |
Cheapest in | February |
Average price | $476 |
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 October 26, 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
OntarioMilwaukee
ONT Ontario - MKE Milwaukee-Mitchell
ONTMKE
Ontario
Mon 11/16
11:10 pm-9:15 am
1 stop8h 05m
Milwaukee-Mitchell
Wed 12/31
12:00 am-10:00 pm
Nonstop0h 00m
$140
OntarioMilwaukee
ONT Ontario - MKE Milwaukee-Mitchell
ONTMKE
Ontario
Wed 11/18
1:15 pm-9:55 pm
1 stop6h 40m
Milwaukee-Mitchell
Wed 12/31
12:00 am-10:00 pm
Nonstop0h 00m
$140
OntarioMilwaukee
ONT Ontario - MKE Milwaukee-Mitchell
ONTMKE
Ontario
Tue 11/17
1:15 pm-9:55 pm
1 stop6h 40m
Milwaukee-Mitchell
Wed 12/31
12:00 am-10:00 pm
Nonstop0h 00m
$140
OntarioMilwaukee
ONT Ontario - MKE Milwaukee-Mitchell
ONTMKE
Ontario
Fri 12/11
11:08 pm-9:13 am
1 stop8h 05m
Milwaukee-Mitchell
Wed 12/31
12:00 am-10:00 pm
Nonstop0h 00m
$178
OntarioMilwaukee
ONT Ontario - MKE Milwaukee-Mitchell
ONTMKE
Ontario
Wed 12/16
12:20 pm-11:59 pm
1 stop9h 39m
Milwaukee-Mitchell
Wed 12/31
12:00 am-10:00 pm
Nonstop0h 00m
$197
OntarioMilwaukee
ONT Ontario - MKE Milwaukee-Mitchell
ONTMKE
Ontario
Mon 11/23
6:00 am-3:35 pm
1 stop7h 35m
Milwaukee-Mitchell
Wed 12/31
12:00 am-10:00 pm
Nonstop0h 00m
$200
OntarioMilwaukee
ONT Ontario - MKE Milwaukee-Mitchell
ONTMKE
Ontario
Tue 11/10
5:00 am-6:58 pm
2 stops11h 58m
Milwaukee-Mitchell
Wed 12/31
12:00 am-10:00 pm
Nonstop0h 00m
$205
OntarioMilwaukee
ONT Ontario - MKE Milwaukee-Mitchell
ONTMKE
Ontario
Fri 1/1
6:00 am-3:33 pm
1 stop7h 33m
Milwaukee-Mitchell
Wed 12/31
12:00 am-10:00 pm
Nonstop0h 00m
$215
OntarioMilwaukee
ONT Ontario - MKE Milwaukee-Mitchell
ONTMKE
Ontario
Fri 12/25
6:00 am-3:33 pm
1 stop7h 33m
Milwaukee-Mitchell
Wed 12/31
12:00 am-10:00 pm
Nonstop0h 00m
$215
OntarioMilwaukee
ONT Ontario - MKE Milwaukee-Mitchell
ONTMKE
Ontario
Fri 12/18
11:52 pm-10:03 am
1 stop8h 11m
Milwaukee-Mitchell
Wed 12/31
12:00 am-10:00 pm
Nonstop0h 00m
$238
Showing 1-10 of 19 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 October.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy2 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, February is the cheapest month in which you can book a flight from Ontario to Milwaukee (average of $426). 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 $408 and $479 in December.The cheapest round-trip price found within the last 5 days was $279 on Southwest (Dec 10-Feb 20).
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 October 26, 2026.
Read reviews from past customers who have flown Southwest and American 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.
Overall
7.9
Comfort
8.0
Boarding
8.1
Crew
8.6
Entertainment
7.4
Food
7.0
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Overall
7.9
Comfort
8.0
Boarding
8.1
Crew
8.6
Entertainment
7.4
Food
7.0
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Overall
7.9
Comfort
8.0
Boarding
8.1
Crew
8.6
Entertainment
7.4
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
Toggle through the tabs below to find thousands of 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.
Search flights from Ontario to Milwaukee by cabin class
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 October 26, 2026.
Ontario and Milwaukee flights
Browse other Ontario and Milwaukee flight options. Last updated on October 26, 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 October 26, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Top 2 airlines flying from Ontario to Milwaukee
Discover the top 2 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 October 26, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$354 | Average$478 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$366 | Average$448 | FlexibilityNo cancel fee | On-time71% |