$139 Cheap Delta flights Milwaukee (MKE) to Ontario (ONT)

View $139 flight on Tue, Jan 20, 2026Opens in a new window

$139 Cheap Delta flights Milwaukee (MKE) to Ontario (ONT)

Prices were available within the past 7 days and start at $139 for one-way flights and $281 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Delta
Tue, Jan 13 - Sat, Jan 17
MKE
Milwaukee
ONT
Ontario
$281 Roundtrip, found 4 hours ago
$281
Roundtrip
found 4 hours ago
Select Delta flight, departing Tue, Jan 13 from Milwaukee to Ontario, returning Sat, Jan 17, priced at $281 found 4 hours ago
Delta
Thu, Jan 15 - Sat, Jan 17
MKE
Milwaukee
ONT
Ontario
$288 Roundtrip, found 4 hours ago
$288
Roundtrip
found 4 hours ago
Select Delta flight, departing Thu, Jan 15 from Milwaukee to Ontario, returning Sat, Jan 17, priced at $288 found 4 hours ago
Delta
Mon, Mar 2 - Thu, Mar 5
MKE
Milwaukee
ONT
Ontario
$291 Roundtrip, found 15 hours ago
$291
Roundtrip
found 15 hours ago
Select Delta flight, departing Mon, Mar 2 from Milwaukee to Ontario, returning Thu, Mar 5, priced at $291 found 15 hours ago
Delta
Thu, Jan 15 - Thu, Jan 22
MKE
Milwaukee
ONT
Ontario
$295 Roundtrip, found 4 hours ago
$295
Roundtrip
found 4 hours ago
Select Delta flight, departing Thu, Jan 15 from Milwaukee to Ontario, returning Thu, Jan 22, priced at $295 found 4 hours ago
Delta
Tue, Feb 3 - Sat, Feb 7
MKE
Milwaukee
ONT
Ontario
$296 Roundtrip, found 1 day ago
$296
Roundtrip
found 1 day ago
Select Delta flight, departing Tue, Feb 3 from Milwaukee to Ontario, returning Sat, Feb 7, priced at $296 found 1 day ago
Delta
Tue, Jan 13 - Tue, Jan 20
MKE
Milwaukee
ONT
Ontario
$316 Roundtrip, found 3 days ago
$316
Roundtrip
found 3 days ago
Select Delta flight, departing Tue, Jan 13 from Milwaukee to Ontario, returning Tue, Jan 20, priced at $316 found 3 days ago
Delta
Thu, Jan 15 - Fri, Jan 16
MKE
Milwaukee
ONT
Ontario
$330 Roundtrip, found 4 hours ago
$330
Roundtrip
found 4 hours ago
Select Delta flight, departing Thu, Jan 15 from Milwaukee to Ontario, returning Fri, Jan 16, priced at $330 found 4 hours ago
Flights from Milwaukee (MKE) to Ontario (ONT)
Origin airport
General Mitchell Intl.
Destination airport
Los Angeles - Ontario Intl.
Airlines serving
Alaska Airlines, American Airlines, Delta, Frontier Airlines, Hawaiian Airlines, Southwest Airlines, United
Popular airline
American Airlines
Distance
1707 mi

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Frequently asked questions

How much is a Delta Air Lines flight from General Mitchell Intl. Airport (MKE) to Los Angeles - Ontario Intl. Airport (ONT)?
Set the "Price (lowest to highest)" filter on Expedia to look for cheap Delta Air Lines round-trip flights from $281 from MKE to ONT. Affordable one-way fares from $139 are also on offer.**These prices were available on Expedia within the past 7 days, for flights departing within the next year. Prices and availability are subject to change. Additional terms apply.
What is the cheapest month to fly from MKE to ONT with Delta Air Lines?
Delta Air Lines flights to Ontario tend to be cheaper in the quieter months of January and April. Whether you're searching for a one-way or a return ticket, you could land a better deal then.
What is the cheapest time to book flights from General Mitchell Intl. Airport (MKE) to Los Angeles - Ontario Intl. Airport (ONT) with Delta Air Lines?
For cheap Delta Air Lines fares from General Mitchell Intl. Airport (MKE) to Los Angeles - Ontario Intl. Airport (ONT), start searching one to three months before your intended departure. Reserving domestic flights 34 to 86 days in advance could save you 25% compared to booking just 6 to 12 days ahead. The day you book can also affect the cost. Sunday is typically the most affordable, while Monday is often the most expensive for domestic flights. You can save 6% on average by choosing to book on a Sunday.**Ideal booking window recommendation is based on average round-trip ticket prices for January through November for 2024. Best day of the week to book recommendation is based on average round-trip ticket prices for January through October 2024. All data sourced from ARC's global airline sales database.
Does Delta Air Lines fly nonstop from General Mitchell Intl. Airport (MKE) to Los Angeles - Ontario Intl. Airport (ONT)?
Simply enter your dates, press search and select "Nonstop" on Expedia to browse any direct flights from MKE to ONT with Delta Air Lines or another carrier.
What is the earliest Delta Air Lines flight from MKE to ONT?
Browse Delta Air Lines's earliest flights from MKE to ONT by checking our "Morning" and "Early Morning" filters. Not only will you get to your destination sooner, early departures also have a 20% less chance of being canceled.**Most reliable time of the day recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
What airports does Delta Air Lines fly into in Ontario?
Delta Air Lines flights from General Mitchell Intl. Airport (MKE) to Ontario come in to Los Angeles - Ontario Intl. Airport (ONT). This is the main entry point to this destination.
Why fly with Delta Air Lines from MKE to ONT?
Delta Air Lines makes traveling from MKE to ONT more comfortable with a rewarding loyalty program and an excellent in-flight experience. You could even start earning points with Delta SkyMiles. Make sure you sign up to our free One Key™ rewards program to earn OneKeyCash™*, which can be redeemed on future trips.*OneKeyCash™ disclaimer - OneKeyCash™ is not redeemable for cash and can only be used on Expedia, Hotels.com and Vrbo.
Can I change or cancel my Delta Air Lines flight from General Mitchell Intl. Airport (MKE) to Los Angeles - Ontario Intl. Airport (ONT)?
Depending on the type of ticket you purchased, a fee may apply if you cancel or reschedule your flight more than 24 hours after it's confirmed. To find plane tickets with more flexibility, select our "Changes included" or "No cancel fee" filter while looking for flights. To learn more about modifying or canceling your reservation, head to "Trips," select your flight and click on "Manage Booking."

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*Available to One Key members.