$165+ 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 6/11. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — MKE
mag 28 — giu 41
Round-trip
1 adult, Economy
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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 aprile 28, 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 aprile 28, 2026.
This American Airlines deal was found by Cheapflights users on 4/23. 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.
sab 5/2311:59 pm
ONT
- MKE
1 stop9h 17m
American Airlines
sab 5/306:34 pm
MKE
- ONT
1 stop7h 25m
American Airlines
Deal found 4/23![American Airlines logo]()
$369
This Delta deal was found by Cheapflights users on 4/23. 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.
mar 5/1210:00 pm
ONT
- MKE
1 stop9h 08m
Delta
sab 5/166:45 am
MKE
- ONT
1 stop7h 34m
Delta
Deal found 4/23![Delta logo]()
$387
This Southwest deal was found by Cheapflights users on 4/23. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar 6/94:35 pm
ONT
- MKE
1 stop5h 20m
Southwest
mar 6/162:40 pm
MKE
- ONT
1 stop6h 20m
Southwest
Deal found 4/23![Southwest logo]()
$391
This American Airlines deal was found by Cheapflights users on 4/23. 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.
mar 5/129:24 am
ONT
- MKE
2 stops11h 03m
American Airlines
sab 5/165:00 pm
MKE
- ONT
1 stop7h 40m
American Airlines
Deal found 4/23![American Airlines logo]()
$392
This Delta deal was found by Cheapflights users on 4/26. 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.
lun 5/1812:07 pm
ONT
- MKE
1 stop9h 46m
Delta
mer 5/202:51 pm
MKE
- ONT
1 stop8h 57m
Delta
Deal found 4/26![Delta logo]()
$393
This American Airlines deal was found by Cheapflights users on 4/28. 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.
lun 5/1811:29 pm
ONT
- MKE
1 stop8h 40m
American Airlines
mer 5/207:08 am
MKE
- ONT
1 stop8h 10m
American Airlines
Deal found 4/28![American Airlines logo]()
$395
This Delta deal was found by Cheapflights users on 4/24. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sab 5/301:29 pm
ONT
- MKE
1 stop6h 04m
Delta
sab 6/64:02 pm
MKE
- ONT
1 stop7h 46m
Delta
Deal found 4/24![Delta logo]()
$397
This Delta deal was found by Cheapflights users on 4/26. 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.
lun 5/1810:00 pm
ONT
- MKE
1 stop9h 08m
Delta
gio 5/212:55 pm
MKE
- ONT
1 stop8h 53m
Delta
Deal found 4/26![Delta logo]()
$399
This United Airlines deal was found by Cheapflights users on 4/27. 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.
sab 5/235:00 am
ONT
- MKE
1 stop6h 25m
United Airlines
sab 5/301:30 pm
MKE
- ONT
2 stops11h 20m
United Airlines
Deal found 4/27![United Airlines logo]()
$402
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 aprile 28, 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 aprile 28, 2026.
This Delta deal was found by Cheapflights users on 4/26. 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.
sab 5/3010:00 pm
ONT
- MKE
1 stop9h 08m
Delta
sab 6/64:02 pm
MKE
- ONT
1 stop7h 46m
Delta
Deal found 4/26![Delta logo]()
$397
This United Airlines deal was found by Cheapflights users on 4/23. 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.
lun 5/111:40 pm
ONT
- MKE
1 stop5h 47m
United Airlines
sab 5/162:38 pm
MKE
- ONT
1 stop7h 58m
United Airlines
Deal found 4/23![United Airlines logo]()
$423
This Southwest deal was found by Cheapflights users on 4/26. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mer 7/14:10 pm
ONT
- MKE
1 stop6h 45m
Southwest
mer 7/87:20 am
MKE
- ONT
2 stops7h 35m
Southwest
Deal found 4/26![Southwest logo]()
$433
This Delta deal was found by Cheapflights users on 4/23. 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.
lun 5/1110:00 pm
ONT
- MKE
1 stop9h 08m
Delta
gio 5/146:45 am
MKE
- ONT
1 stop7h 34m
Delta
Deal found 4/23![Delta logo]()
$433
This Southwest deal was found by Cheapflights users on 4/23. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sab 5/236:00 am
ONT
- MKE
2 stops8h 50m
Southwest
sab 5/305:30 am
MKE
- ONT
2 stops8h 45m
Southwest
Deal found 4/23![Southwest logo]()
$438
This United Airlines deal was found by Cheapflights users on 4/27. 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.
mar 5/196:00 am
ONT
- MKE
2 stops13h 27m
United Airlines
mer 5/203:51 pm
MKE
- ONT
1 stop8h 07m
United Airlines
Deal found 4/27![United Airlines logo]()
$492
This Southwest deal was found by Cheapflights users on 4/27. 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.
ven 5/228:10 am
ONT
- MKE
2 stops7h 45m
Southwest
mar 5/263:55 pm
MKE
- ONT
1 stop8h 20m
Southwest
Deal found 4/27![Southwest logo]()
$467
This Delta deal was found by Cheapflights users on 4/26. 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.
dom 8/210:00 pm
ONT
- MKE
1 stop9h 06m
Delta
sab 8/812:56 pm
MKE
- ONT
1 stop7h 27m
Delta
Deal found 4/26![Delta logo]()
$477
This Southwest deal was found by Cheapflights users on 4/23. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mer 7/812:05 pm
ONT
- MKE
2 stops8h 10m
Southwest
lun 7/135:15 am
MKE
- ONT
2 stops8h 05m
Southwest
Deal found 4/23![Southwest logo]()
$487
This Delta deal was found by Cheapflights users on 4/23. 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.
sab 5/91:29 pm
ONT
- MKE
1 stop6h 04m
Delta
mer 5/135:23 am
MKE
- ONT
1 stop7h 34m
Delta
Deal found 4/23![Delta logo]()
$487
This Southwest deal was found by Cheapflights users on 4/23. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
gio 5/2112:40 pm
ONT
- MKE
2 stops7h 35m
Southwest
sab 5/235:25 pm
MKE
- ONT
1 stop5h 55m
Southwest
Deal found 4/23![Southwest logo]()
$503
Last-minute flights from Ontario to MilwaukeeDiscover last-minute flight deals from Ontario to Milwaukee. Data last updated aprile 28, 2026 and is based on user searches.
Discover last-minute flight deals from Ontario to Milwaukee. Data last updated aprile 28, 2026 and is based on user searches.
This Delta deal was found by Cheapflights users on 4/23. 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.
mar 5/1210:00 pm
ONT
- MKE
1 stop9h 08m
Delta
sab 5/166:45 am
MKE
- ONT
1 stop7h 34m
Delta
Deal found 4/23![Delta logo]()
$387
This American Airlines deal was found by Cheapflights users on 4/23. 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.
mar 5/129:24 am
ONT
- MKE
2 stops11h 03m
American Airlines
sab 5/165:00 pm
MKE
- ONT
1 stop7h 40m
American Airlines
Deal found 4/23![American Airlines logo]()
$392
This Delta deal was found by Cheapflights users on 4/26. 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.
lun 5/1812:07 pm
ONT
- MKE
1 stop9h 46m
Delta
mer 5/202:51 pm
MKE
- ONT
1 stop8h 57m
Delta
Deal found 4/26![Delta logo]()
$393
This American Airlines deal was found by Cheapflights users on 4/28. 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.
lun 5/1811:29 pm
ONT
- MKE
1 stop8h 40m
American Airlines
mer 5/207:08 am
MKE
- ONT
1 stop8h 10m
American Airlines
Deal found 4/28![American Airlines logo]()
$395
This Delta deal was found by Cheapflights users on 4/26. 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.
lun 5/1810:00 pm
ONT
- MKE
1 stop9h 08m
Delta
gio 5/212:55 pm
MKE
- ONT
1 stop8h 53m
Delta
Deal found 4/26![Delta logo]()
$399
This CheapOair deal was found by Cheapflights users on 4/23. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mer 5/206:00 am
ONT
- MKE
1 stop7h 44m
Alaska Airlines
dom 5/244:40 pm
MKE
- ONT
1 stop9h 18m
Alaska Airlines
Deal found 4/23![Alaska Airlines logo]()
$406
This American Airlines deal was found by Cheapflights users on 4/23. 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.
sab 5/2311:59 pm
ONT
- MKE
1 stop9h 17m
American Airlines
sab 5/306:34 pm
MKE
- ONT
1 stop7h 25m
American Airlines
Deal found 4/23![American Airlines logo]()
$369
This United Airlines deal was found by Cheapflights users on 4/27. 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.
sab 5/235:00 am
ONT
- MKE
1 stop6h 25m
United Airlines
sab 5/301:30 pm
MKE
- ONT
2 stops11h 20m
United Airlines
Deal found 4/27![United Airlines logo]()
$402
This Delta deal was found by Cheapflights users on 4/24. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sab 5/301:29 pm
ONT
- MKE
1 stop6h 04m
Delta
sab 6/64:02 pm
MKE
- ONT
1 stop7h 46m
Delta
Deal found 4/24![Delta logo]()
$397
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 aprile 28, 2026.
Search for one-way flight options from Ontario to Milwaukee. Find affordable one-way fares based on user searches. Data last updated aprile 28, 2026.
This Trip.com deal was found by Cheapflights users on 4/24. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
gio 6/113:34 pm
ONT
- MKE
2 stops17h 39m
Frontier
Deal found 4/24![Frontier logo]()
$165
This American Airlines deal was found by Cheapflights users on 4/23. 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.
sab 5/307:00 am
ONT
- MKE
1 stop8h 44m
American Airlines
Deal found 4/23![American Airlines logo]()
$185
This Alaska Airlines deal was found by Cheapflights users on 4/27. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mer 5/2712:06 pm
ONT
- MKE
1 stop9h 53m
Alaska Airlines
Deal found 4/27![Alaska Airlines logo]()
$194
This Delta deal was found by Cheapflights users on 4/27. 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.
sab 6/67:05 am
ONT
- MKE
1 stop7h 52m
Delta
Deal found 4/27![Delta logo]()
$199
This American Airlines deal was found by Cheapflights users on 4/26. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sab 6/66:10 am
ONT
- MKE
2 stops9h 25m
American Airlines
Deal found 4/26![American Airlines logo]()
$204
This Kiwi.com deal was found by Cheapflights users on 4/27. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun 5/118:06 pm
ONT
- MKE
3 stops58h 55m
Multiple Airlines
Deal found 4/27![Multiple Airlines logo]()
$212
This United Airlines deal was found by Cheapflights users on 4/23. 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.
mar 6/96:30 am
ONT
- MKE
1 stop8h 12m
United Airlines
Deal found 4/23![United Airlines logo]()
$218
This Alaska Airlines deal was found by Cheapflights users on 4/27. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mer 5/206:00 am
ONT
- MKE
1 stop7h 44m
Alaska Airlines
Deal found 4/27![Alaska Airlines logo]()
$220
This Southwest deal was found by Cheapflights users on 4/26. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar 6/305:15 am
ONT
- MKE
2 stops6h 45m
Southwest
Deal found 4/26![Southwest logo]()
$225
This Kiwi.com deal was found by Cheapflights users on 4/23. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar 6/233:34 pm
ONT
- MKE
3 stops38h 24m
Multiple Airlines
Deal found 4/23![Multiple Airlines logo]()
$232
This Kiwi.com deal was found by Cheapflights users on 4/27. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom 6/76:00 am
ONT
- MKE
3 stops47h 58m
Multiple Airlines
Deal found 4/27![Multiple Airlines logo]()
$234
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 aprile 28, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $369 (American Airlines) |
One-way from | $165 (Trip.com) |
Popular in | January |
Cheapest in | September |
Average price | $456 |
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 2,558,603 searches. Data last updated aprile 28, 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 - MKE
ONTMKE
Ontario
sab 5/30
10:00 pm-9:08 am
1 stop9h 08m
Milwaukee-Mitchell
sab 6/6
4:02 pm-9:48 pm
1 stop7h 46m
$397
OntarioMilwaukee
ONT - MKE
ONTMKE
Ontario
lun 5/11
1:40 pm-9:27 pm
1 stop5h 47m
Milwaukee-Mitchell
sab 5/16
2:38 pm-8:36 pm
1 stop7h 58m
$423
OntarioMilwaukee
ONT - MKE
ONTMKE
Ontario
mer 7/1
4:10 pm-12:55 am
1 stop6h 45m
Milwaukee-Mitchell
mer 7/8
7:20 am-12:55 pm
2 stops7h 35m
$433
OntarioMilwaukee
ONT - MKE
ONTMKE
Ontario
lun 5/11
10:00 pm-9:08 am
1 stop9h 08m
Milwaukee-Mitchell
gio 5/14
6:45 am-12:19 pm
1 stop7h 34m
$433
OntarioMilwaukee
ONT - MKE
ONTMKE
Ontario
sab 5/23
6:00 am-4:50 pm
2 stops8h 50m
Milwaukee-Mitchell
sab 5/30
5:30 am-12:15 pm
2 stops8h 45m
$438
OntarioMilwaukee
ONT - MKE
ONTMKE
Ontario
ven 5/22
8:10 am-5:55 pm
2 stops7h 45m
Milwaukee-Mitchell
mar 5/26
3:55 pm-10:15 pm
1 stop8h 20m
$467
OntarioMilwaukee
ONT - MKE
ONTMKE
Ontario
dom 8/2
10:00 pm-9:06 am
1 stop9h 06m
Milwaukee-Mitchell
sab 8/8
12:56 pm-6:23 pm
1 stop7h 27m
$477
OntarioMilwaukee
ONT - MKE
ONTMKE
Ontario
mer 7/8
12:05 pm-10:15 pm
2 stops8h 10m
Milwaukee-Mitchell
lun 7/13
5:15 am-11:20 am
2 stops8h 05m
$487
OntarioMilwaukee
ONT - MKE
ONTMKE
Ontario
sab 5/9
1:29 pm-9:33 pm
1 stop6h 04m
Milwaukee-Mitchell
mer 5/13
5:23 am-10:57 am
1 stop7h 34m
$487
OntarioMilwaukee
ONT - MKE
ONTMKE
Ontario
mar 5/19
6:00 am-9:27 pm
2 stops13h 27m
Milwaukee-Mitchell
mer 5/20
3:51 pm-9:58 pm
1 stop8h 07m
$492
Showing 1-10 of 20 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 April.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars |
- 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, September is the cheapest month in which you can book a flight from Ontario to Milwaukee (average of $366). Flying from Ontario to Milwaukee in January is currently the most expensive (average of $557). 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?
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 aprile 28, 2026.
Read reviews from past customers who have flown Southwest,Delta, andUnited 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
Food
7.0
Comfort
8.0
Crew
8.6
Entertainment
7.5
Overall
8.0
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Boarding
8.1
Food
7.0
Comfort
8.0
Crew
8.6
Entertainment
7.5
Overall
8.0
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Boarding
8.1
Food
7.0
Comfort
8.0
Crew
8.6
Entertainment
7.5
Overall
8.0
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Boarding
8.1
Food
7.0
Comfort
8.0
Crew
8.6
Entertainment
7.5
Overall
8.0
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Boarding
8.1
Food
7.0
Comfort
8.0
Crew
8.6
Entertainment
7.5
Overall
8.0
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
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 locationsSheboygan
Port Washington
New Berlin
Oak Creek
Wauwatosa
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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 aprile 28, 2026.
Ontario and Milwaukee flights
Browse other Ontario and Milwaukee flight options. Last updated on aprile 28, 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 aprile 28, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Top 4 airlines flying from Ontario to Milwaukee
Discover the top 4 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 2,558,603 searches. Data last updated aprile 28, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$253 | Average$452 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$276 | Average$432 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$309 | Average$440 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$326 | Average$427 | FlexibilityNo cancel fee | On-time63% |