$107+ 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 3/25. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — MKE
Apr 9 — Apr 161
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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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 March 10, 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 March 10, 2026.
This CheapOair deal was found by Cheapflights users on 3/8. 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.
Thu 4/165:33 pm
ONT
- MKE
1 stop22h 11m
Frontier
Mon 4/205:05 pm
MKE
- ONT
1 stop8h 50m
Frontier
Deal found 3/8![Frontier logo]()
$201
This CheapOair deal was found by Cheapflights users on 3/9. 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.
Thu 4/2312:59 am
ONT
- MKE
1 stop14h 35m
Frontier
Mon 4/275:05 pm
MKE
- ONT
1 stop8h 50m
Frontier
Deal found 3/9![Frontier logo]()
$222
This Delta deal was found by Cheapflights users on 3/8. 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 4/710:25 pm
ONT
- MKE
1 stop8h 39m
Delta
Tue 4/1412:33 pm
MKE
- ONT
1 stop10h 27m
Delta
Deal found 3/8![Delta logo]()
$317
This Expedia deal was found by Cheapflights users on 3/8. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/167:08 pm
ONT
- MKE
2 stops13h 35m
Multiple Airlines
Mon 4/205:05 pm
MKE
- ONT
1 stop8h 50m
Multiple Airlines
Deal found 3/8![Multiple Airlines logo]()
$329
This Delta deal was found by Cheapflights users on 3/7. 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 4/3012:49 pm
ONT
- MKE
1 stop9h 08m
Delta
Tue 5/57:25 am
MKE
- ONT
1 stop6h 49m
Delta
Deal found 3/7![Delta logo]()
$337
This Southwest deal was found by Cheapflights users on 3/9. 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 5/263:45 pm
ONT
- MKE
1 stop5h 25m
Southwest
Tue 6/94:10 pm
MKE
- ONT
2 stops8h 35m
Southwest
Deal found 3/9![Southwest logo]()
$342
This Alaska Airlines deal was found by Cheapflights users on 3/6. 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 4/286:00 am
ONT
- MKE
1 stop30h 13m
Alaska Airlines
Wed 5/67:00 am
MKE
- ONT
1 stop28h 45m
Alaska Airlines
Deal found 3/6![Alaska Airlines logo]()
$343
This Delta deal was found by Cheapflights users on 3/9. 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 4/175:55 pm
ONT
- MKE
2 stops12h 54m
Delta
Mon 4/207:25 am
MKE
- ONT
1 stop6h 49m
Delta
Deal found 3/9![Delta logo]()
$355
This Delta deal was found by Cheapflights users on 3/7. 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 4/61:20 pm
ONT
- MKE
1 stop5h 55m
Delta
Mon 4/137:25 am
MKE
- ONT
1 stop6h 49m
Delta
Deal found 3/7![Delta logo]()
$357
This Priceline deal was found by Cheapflights users on 3/9. 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.
Fri 3/136:15 am
ONT
- MKE
1 stop10h 36m
Frontier
Mon 3/167:15 pm
MKE
- ONT
1 stop6h 44m
Frontier
Deal found 3/9![Frontier logo]()
$360
This United Airlines deal was found by Cheapflights users on 3/6. 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 6/25:00 am
ONT
- MKE
2 stops10h 53m
United Airlines
Tue 6/95:29 pm
MKE
- ONT
1 stop7h 17m
United Airlines
Deal found 3/6![United Airlines logo]()
$362
This Southwest deal was found by Cheapflights users on 3/8. 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 4/161:55 pm
ONT
- MKE
2 stops7h 05m
Southwest
Mon 4/204:50 pm
MKE
- ONT
2 stops8h 15m
Southwest
Deal found 3/8![Southwest logo]()
$367
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 March 10, 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 March 10, 2026.
This Alaska Airlines deal was found by Cheapflights users on 3/6. 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 4/286:00 am
ONT
- MKE
1 stop30h 13m
Alaska Airlines
Wed 5/67:00 am
MKE
- ONT
1 stop28h 45m
Alaska Airlines
Deal found 3/6![Alaska Airlines logo]()
$343
This Delta deal was found by Cheapflights users on 3/7. 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 4/61:20 pm
ONT
- MKE
1 stop5h 55m
Delta
Mon 4/137:25 am
MKE
- ONT
1 stop6h 49m
Delta
Deal found 3/7![Delta logo]()
$357
This United Airlines deal was found by Cheapflights users on 3/5. 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.
Wed 5/135:00 am
ONT
- MKE
1 stop6h 31m
United Airlines
Sat 5/162:38 pm
MKE
- ONT
1 stop7h 58m
United Airlines
Deal found 3/5![United Airlines logo]()
$407
This Southwest deal was found by Cheapflights users on 3/9. 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.
Sat 5/303:35 pm
ONT
- MKE
1 stop5h 50m
Southwest
Sat 6/65:20 am
MKE
- ONT
2 stops10h 20m
Southwest
Deal found 3/9![Southwest logo]()
$462
This United Airlines deal was found by Cheapflights users on 3/7. 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 4/161:34 pm
ONT
- MKE
1 stop6h 58m
United Airlines
Mon 4/204:13 pm
MKE
- ONT
1 stop6h 23m
United Airlines
Deal found 3/7![United Airlines logo]()
$447
This Delta deal was found by Cheapflights users on 3/5. 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.
Sat 8/110:59 pm
ONT
- MKE
1 stop8h 24m
Delta
Sat 8/82:45 pm
MKE
- ONT
1 stop9h 24m
Delta
Deal found 3/5![Delta logo]()
$457
This Alaska Airlines deal was found by Cheapflights users on 3/6. 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 5/296:00 am
ONT
- MKE
1 stop7h 44m
Alaska Airlines
Mon 6/17:00 am
MKE
- ONT
1 stop10h 09m
Alaska Airlines
Deal found 3/6![Alaska Airlines logo]()
$472
This Delta deal was found by Cheapflights users on 3/6. 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 9/67:00 am
ONT
- MKE
1 stop7h 17m
Delta
Sat 9/1212:20 pm
MKE
- ONT
1 stop7h 41m
Delta
Deal found 3/6![Delta logo]()
$457
This Delta deal was found by Cheapflights users on 3/7. 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.
Sat 5/3010:00 pm
ONT
- MKE
1 stop9h 08m
Delta
Sat 6/64:02 pm
MKE
- ONT
1 stop7h 46m
Delta
Deal found 3/7![Delta logo]()
$457
Last-minute flights from Ontario to MilwaukeeDiscover last-minute flight deals from Ontario to Milwaukee. Data last updated March 10, 2026 and is based on user searches.
Discover last-minute flight deals from Ontario to Milwaukee. Data last updated March 10, 2026 and is based on user searches.
This Priceline deal was found by Cheapflights users on 3/9. 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.
Fri 3/136:15 am
ONT
- MKE
1 stop10h 36m
Frontier
Mon 3/167:15 pm
MKE
- ONT
1 stop6h 44m
Frontier
Deal found 3/9![Frontier logo]()
$360
This Delta deal was found by Cheapflights users on 3/7. 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 4/61:20 pm
ONT
- MKE
1 stop5h 55m
Delta
Mon 4/137:25 am
MKE
- ONT
1 stop6h 49m
Delta
Deal found 3/7![Delta logo]()
$357
This Delta deal was found by Cheapflights users on 3/8. 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 4/710:25 pm
ONT
- MKE
1 stop8h 39m
Delta
Tue 4/1412:33 pm
MKE
- ONT
1 stop10h 27m
Delta
Deal found 3/8![Delta logo]()
$317
This CheapOair deal was found by Cheapflights users on 3/8. 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.
Thu 4/165:33 pm
ONT
- MKE
1 stop22h 11m
Frontier
Mon 4/205:05 pm
MKE
- ONT
1 stop8h 50m
Frontier
Deal found 3/8![Frontier logo]()
$201
This Expedia deal was found by Cheapflights users on 3/8. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/167:08 pm
ONT
- MKE
2 stops13h 35m
Multiple Airlines
Mon 4/205:05 pm
MKE
- ONT
1 stop8h 50m
Multiple Airlines
Deal found 3/8![Multiple Airlines logo]()
$329
This Southwest deal was found by Cheapflights users on 3/8. 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 4/161:55 pm
ONT
- MKE
2 stops7h 05m
Southwest
Mon 4/204:50 pm
MKE
- ONT
2 stops8h 15m
Southwest
Deal found 3/8![Southwest logo]()
$367
This Delta deal was found by Cheapflights users on 3/9. 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 4/175:55 pm
ONT
- MKE
2 stops12h 54m
Delta
Mon 4/207:25 am
MKE
- ONT
1 stop6h 49m
Delta
Deal found 3/9![Delta logo]()
$355
This CheapOair deal was found by Cheapflights users on 3/9. 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.
Thu 4/2312:59 am
ONT
- MKE
1 stop14h 35m
Frontier
Mon 4/275:05 pm
MKE
- ONT
1 stop8h 50m
Frontier
Deal found 3/9![Frontier logo]()
$222
This Alaska Airlines deal was found by Cheapflights users on 3/7. 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 4/237:59 pm
ONT
- MKE
1 stop16h 14m
Alaska Airlines
Sat 4/257:00 am
MKE
- ONT
1 stop28h 45m
Alaska Airlines
Deal found 3/7![Alaska Airlines logo]()
$383
This Alaska Airlines deal was found by Cheapflights users on 3/6. 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 4/286:00 am
ONT
- MKE
1 stop30h 13m
Alaska Airlines
Wed 5/67:00 am
MKE
- ONT
1 stop28h 45m
Alaska Airlines
Deal found 3/6![Alaska Airlines logo]()
$343
This Delta deal was found by Cheapflights users on 3/7. 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 4/3012:49 pm
ONT
- MKE
1 stop9h 08m
Delta
Tue 5/57:25 am
MKE
- ONT
1 stop6h 49m
Delta
Deal found 3/7![Delta logo]()
$337
This Delta deal was found by Cheapflights users on 3/7. 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 4/3012:49 pm
ONT
- MKE
1 stop9h 08m
Delta
Sun 5/312:33 pm
MKE
- ONT
1 stop8h 00m
Delta
Deal found 3/7![Delta logo]()
$407
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 March 10, 2026.
Search for one-way flight options from Ontario to Milwaukee. Find affordable one-way fares based on user searches. Data last updated March 10, 2026.
This CheapOair deal was found by Cheapflights users on 3/8. 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.
Wed 3/2510:03 pm
ONT
- MKE
1 stop12h 59m
Frontier
Deal found 3/8![Frontier logo]()
$107
This Frontier deal was found by Cheapflights users on 3/9. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/110:03 pm
ONT
- MKE
1 stop11h 59m
Frontier
Deal found 3/9![Frontier logo]()
$111
This Expedia deal was found by Cheapflights users on 3/9. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/309:49 pm
ONT
- MKE
1 stop13h 13m
Frontier
Deal found 3/9![Frontier logo]()
$125
This CheapOair deal was found by Cheapflights users on 3/9. 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.
Sun 5/1712:59 am
ONT
- MKE
1 stop16h 00m
Frontier
Deal found 3/9![Frontier logo]()
$157
This United Airlines deal was found by Cheapflights users on 3/8. 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 3/315:10 am
ONT
- MKE
1 stop7h 18m
United Airlines
Deal found 3/8![United Airlines logo]()
$159
This American Airlines deal was found by Cheapflights users on 3/8. 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 3/317:59 pm
ONT
- MKE
2 stops9h 50m
American Airlines
Deal found 3/8![American Airlines logo]()
$164
This Delta deal was found by Cheapflights users on 3/9. 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 5/155:50 pm
ONT
- MKE
2 stops12h 59m
Delta
Deal found 3/9![Delta logo]()
$177
This Delta deal was found by Cheapflights users on 3/8. 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 6/27:05 am
ONT
- MKE
1 stop7h 07m
Delta
Deal found 3/8![Delta logo]()
$179
This United Airlines deal was found by Cheapflights users on 3/9. 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.
Mon 3/306:49 pm
ONT
- MKE
2 stops13h 11m
United Airlines
Deal found 3/9![United Airlines logo]()
$194
This Southwest deal was found by Cheapflights users on 3/9. 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.
Mon 3/303:05 pm
ONT
- MKE
2 stops7h 50m
Southwest
Deal found 3/9![Southwest logo]()
$204
This American Airlines deal was found by Cheapflights users on 3/6. 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.
Mon 3/307:59 pm
ONT
- MKE
2 stops9h 50m
American Airlines
Deal found 3/6![American Airlines logo]()
$207
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 March 10, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $201 (CheapOair) |
One-way from | $107 (CheapOair) |
Popular in | January |
Cheapest in | September |
Average price | $448 |
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 March 10, 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
Tue 4/28
6:00 am-2:13 pm
1 stop30h 13m
Milwaukee-Mitchell
Wed 5/6
7:00 am-9:45 am
1 stop28h 45m
$343
Quickest round-trip
OntarioMilwaukee
ONT - MKE
ONTMKE
Ontario
Mon 4/6
1:20 pm-9:15 pm
1 stop5h 55m
Milwaukee-Mitchell
Mon 4/13
7:25 am-12:14 pm
1 stop6h 49m
$357
OntarioMilwaukee
ONT - MKE
ONTMKE
Ontario
Wed 5/13
5:00 am-1:31 pm
1 stop6h 31m
Milwaukee-Mitchell
Sat 5/16
2:38 pm-8:36 pm
1 stop7h 58m
$407
OntarioMilwaukee
ONT - MKE
ONTMKE
Ontario
Thu 4/16
1:34 pm-10:32 pm
1 stop6h 58m
Milwaukee-Mitchell
Mon 4/20
4:13 pm-8:36 pm
1 stop6h 23m
$447
OntarioMilwaukee
ONT - MKE
ONTMKE
Ontario
Sat 8/1
10:59 pm-9:23 am
1 stop8h 24m
Milwaukee-Mitchell
Sat 8/8
2:45 pm-10:09 pm
1 stop9h 24m
$457
OntarioMilwaukee
ONT - MKE
ONTMKE
Ontario
Sun 9/6
7:00 am-4:17 pm
1 stop7h 17m
Milwaukee-Mitchell
Sat 9/12
12:20 pm-6:01 pm
1 stop7h 41m
$457
OntarioMilwaukee
ONT - MKE
ONTMKE
Ontario
Sat 5/30
10:00 pm-9:08 am
1 stop9h 08m
Milwaukee-Mitchell
Sat 6/6
4:02 pm-9:48 pm
1 stop7h 46m
$457
OntarioMilwaukee
ONT - MKE
ONTMKE
Ontario
Sat 5/30
3:35 pm-11:25 pm
1 stop5h 50m
Milwaukee-Mitchell
Sat 6/6
5:20 am-1:40 pm
2 stops10h 20m
$462
OntarioMilwaukee
ONT - MKE
ONTMKE
Ontario
Fri 5/29
6:00 am-3:44 pm
1 stop7h 44m
Milwaukee-Mitchell
Mon 6/1
7:00 am-3:09 pm
1 stop10h 09m
$472
Cheapest one-way
OntarioMilwaukee
ONT - MKE
ONTMKE
Ontario
Sat 5/16
6:59 pm-7:49 am
2 stops10h 50m
$164
Showing 1-10 of 21 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 March.
| 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
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 March 10, 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
Entertainment
7.5
Crew
8.6
Comfort
8.0
Overall
8.0
Food
7.0
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Boarding
8.1
Entertainment
7.5
Crew
8.6
Comfort
8.0
Overall
8.0
Food
7.0
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Boarding
8.1
Entertainment
7.5
Crew
8.6
Comfort
8.0
Overall
8.0
Food
7.0
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Boarding
8.1
Entertainment
7.5
Crew
8.6
Comfort
8.0
Overall
8.0
Food
7.0
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Boarding
8.1
Entertainment
7.5
Crew
8.6
Comfort
8.0
Overall
8.0
Food
7.0
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
New Berlin
Oak Creek
Wauwatosa
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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 March 10, 2026.
Ontario and Milwaukee flights
Browse other Ontario and Milwaukee flight options. Last updated on March 10, 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 March 10, 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 March 10, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$253 | Average$442 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$276 | Average$426 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$309 | Average$426 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$326 | Average$404 | FlexibilityNo cancel fee | On-time63% |