MKE - ONT

$140 Find Cheap Flights from Milwaukee to Ontario - Compare and Save

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1 adult, Economy, 0 bags

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Everything you should know

Cheapest round-trip
$279
Typical prices: $384-$518
Southwest
Sat 11/10Mon 11/12
MKE - ONT • 1 stop
Cheapest one-way
$140
Typical prices: $200-$359
Southwest
Thu 1/4
MKE - ONT • 1 stop
Nonstop flights
Not available
There are currently no direct flights between Milwaukee and Ontario. You'll need to take a connecting flight to reach the destination.
Insights
Insights
When to travel
January
Cheapest • 34% price drop
July
Most popular
Good to know
+1
Good to know
+1
Top layover airports
Denver Intl (DEN)
Cheapest • Avg $451 (round-trip)
Las Vegas Harry Reid Intl (LAS)
Shortest trip • 5h 58m (one-way)
Insights
Insights
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Flight Deals

Cheap Flights from Milwaukee to Ontario (MKE-ONT)

 
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Milwaukee to Ontario

Mon, Dec 14 - Wed, Dec 16
Southwest Logo
5:15 am - 9:20 amMKE  Milwaukee-Mitchell-ONT Ontario
6h 05m1 stop Phoenix Sky Harbor Intl
Southwest Logo
1:30 pm - 10:45 pmONT  Ontario-MKE Milwaukee-Mitchell
7h 15m1 stop Las Vegas Harry Reid Intl
$279Southwest
Tue, Nov 10 - Thu, Nov 12
Southwest Logo
5:15 am - 12:10 pmMKE  Milwaukee-Mitchell-ONT Ontario
8h 55m1 stop Phoenix Sky Harbor Intl
Southwest Logo
2:45 pm - 10:10 pmONT  Ontario-MKE Milwaukee-Mitchell
5h 25m1 stop Denver Intl
$279Southwest
Thu, Jan 7 - Tue, Jan 12
Delta Logo
5:55 am - 11:27 amMKE  Milwaukee-Mitchell-ONT Ontario
7h 32m1 stop Atlanta Hartsfield-Jackson
Delta Logo
7:00 am - 5:45 pmONT  Ontario-MKE Milwaukee-Mitchell
8h 45m1 stop Atlanta Hartsfield-Jackson
$279Delta
Wed, Jan 6 - Mon, Jan 11
Delta Logo
7:15 am - 12:30 pmMKE  Milwaukee-Mitchell-ONT Ontario
7h 15m1 stop Salt Lake City
Delta Logo
12:00 pm - 10:29 pmONT  Ontario-MKE Milwaukee-Mitchell
8h 29m1 stop Atlanta Hartsfield-Jackson
$279Delta
Mon, Dec 14 - Thu, Dec 17
Southwest Logo
5:45 am - 10:10 amMKE  Milwaukee-Mitchell-ONT Ontario
6h 25m1 stop Denver Intl
Southwest Logo
5:20 pm - 12:45 amONT  Ontario-MKE Milwaukee-Mitchell
5h 25m1 stop Phoenix Sky Harbor Intl
$279Southwest
Wed, Jan 6 - Sat, Jan 9
Delta Logo
7:15 am - 12:30 pmMKE  Milwaukee-Mitchell-ONT Ontario
7h 15m1 stop Salt Lake City
Delta Logo
1:00 pm - 9:25 pmONT  Ontario-MKE Milwaukee-Mitchell
6h 25m1 stop Salt Lake City
$279Delta
Tue, Nov 17 - Sat, Nov 21
American Airlines Logo
7:05 am - 4:19 pmMKE  Milwaukee-Mitchell-ONT Ontario
11h 14m2 stops Dallas/Fort Worth Phoenix Sky Harbor Intl
American Airlines Logo
6:30 am - 1:59 pmONT  Ontario-MKE Milwaukee-Mitchell
5h 29m1 stop Phoenix Sky Harbor Intl
$284American Airlines
Tue, Nov 10 - Thu, Nov 12
United Airlines Logo
9:33 am - 6:01 pmMKE  Milwaukee-Mitchell-ONT Ontario
10h 28m2 stops Chicago O'Hare Intl San Francisco
United Airlines Logo
5:00 am - 1:34 pmONT  Ontario-MKE Milwaukee-Mitchell
6h 34m1 stop Denver Intl
$284United Airlines
Mon, Dec 14 - Thu, Dec 17
United Airlines Logo
7:00 am - 3:35 pmMKE  Milwaukee-Mitchell-ONT Ontario
10h 35m2 stops Chicago O'Hare Intl San Francisco
United Airlines Logo
5:00 am - 1:44 pmONT  Ontario-MKE Milwaukee-Mitchell
6h 44m1 stop Denver Intl
$284United Airlines
Thu, Jan 14 - Mon, Jan 18
American Airlines Logo
2:53 pm - 8:37 amMKE  Milwaukee-Mitchell-ONT Ontario
19h 44m1 stop Phoenix Sky Harbor Intl
American Airlines Logo
6:26 am - 3:04 pmONT  Ontario-MKE Milwaukee-Mitchell
6h 38m1 stop Chicago O'Hare Intl
$315American Airlines
Booking Insights

Price, demand and travel trends for Milwaukee to Ontario flights

Use KAYAK data on prices, travel dates, airlines and seasonal trends to compare options and book flights with more confidence.

How much is a round-trip flight from Milwaukee to Ontario?

Round-trip flights from Milwaukee to Ontario typically range from $384 to $518. The lowest price found in the past 5 days was $279, on Southwest.

What's the cheapest day of the week to fly from Milwaukee to Ontario?

Based on deals KAYAK users found in the last 12 months, Saturday is the cheapest day of the week to fly from Milwaukee to Ontario. It’s 21% cheaper than the average day, while Friday is the most expensive, with prices 8% higher.

What’s the cheapest month to fly from Milwaukee to Ontario?

•January is the cheapest month to fly from Milwaukee to Ontario at $306 round-trip.
•September ($674) and February ($625) are the most expensive months.
•The price difference between flying in the cheapest and most expensive months is 120% on average.
This is based on KAYAK aggregated and averaged internal data over the past 12 months.

Find deals

Key details for Milwaukee to Ontario flights

Low season

September

Cheapest flight

$140
Beat the crowds with an average 41% drop in travelers.
The most popular month to fly with an average 28% increase in travelers.
One-way flight from Milwaukee to Ontario

When to book flights from Milwaukee to Ontario

Are your dates flexible? Find out the best times to travel from Milwaukee to Ontario based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price

Your Milwaukee to Ontario flight questions, answered

Find helpful answers about this route, including flight times, airports, airlines and booking tips.

  • What cabin classes can I book on flights from Milwaukee to Ontario?

    Only Economy Class is available on flights from Milwaukee to Ontario.

  • How long is a flight from Milwaukee to Ontario?

    A nonstop flight from Milwaukee to Ontario takes 00m, covering 1,707 miles.

  • Do I need a passport to fly from Milwaukee to Ontario?

    No, a passport is not required for this domestic route, but you will need a real ID-compliant driver's license, a state ID or another TSA-accepted form of identification.

  • How much should I expect to pay for a Milwaukee to Ontario flight?

    Round-trip flights from Milwaukee to Ontario range from $384 to $518, with an average of $461 over the past 12 months. Anything below $384 counts as a good deal.

  • Have flight prices from Milwaukee to Ontario changed much recently?

    Yes. Based on fares seen in the past 5 days, round-trip prices on this route showed a wide range, from about $279 to $2,112. That means the highest observed fare was about 8x higher than the lowest one.

  • How are flight prices from Milwaukee to Ontario looking right now?

    One-way fares from Milwaukee to Ontario are currently lower than usual. Average one-way flight prices are about $165, which is 31% below the typical average for this route.

  • What car rental options are available at Ontario Airport (ONT)?

    Ontario Airport (ONT) hosts 5 major car rental companies, with daily rates starting from around $18 for economy cars. Top options include:

    • Fox
    • Thrifty
    • Europcar
    • Dollar
    • Alamo

  • Which airports can I use when flying from Milwaukee to Ontario?

    Flights from Milwaukee to Ontario usually depart from Milwaukee-Mitchell (MKE) and arrive at Ontario (ONT).

  • Which airports do connecting flights from Milwaukee to Ontario pass through?

    One-stop flights from Milwaukee to Ontario most commonly connect through:

    • Denver Intl (DEN) - 46% of one-stop connections
    • Phoenix Sky Harbor Intl (PHX) - 23% of one-stop connections
    • Salt Lake City (SLC) - 17% of one-stop connections
    • Las Vegas Harry Reid Intl (LAS) - 8% of one-stop connections

  • Can I save money by using flexible dates for flights from Milwaukee to Ontario?

    Yes. Flexible dates can save you up to 27% on flights from Milwaukee to Ontario. Saturday is the cheapest departure day at $368 round-trip on average, while Friday is the most expensive at $499, a difference of $131.

    Cheaper weekend fares like these are typical of routes dominated by weekday business travel.

  • How much time can I save by choosing a different layover airport from Milwaukee to Ontario?

    Flying via Las Vegas Harry Reid Intl (LAS) gives the shortest average 1-stop total travel time at 5h 58m, compared with 6h 04m via Phoenix Sky Harbor Intl (PHX) and 6h 17m via Denver Intl (DEN).

  • What is the time difference between Milwaukee and Ontario?

    Ontario is 2 hours behind Milwaukee (Pacific Time vs Central Time). Plan for the time shift when scheduling connections or first-day activities.

  • What popular places can I visit in Ontario?

    Some of the most popular sights in Ontario are Ontario Convention Center and Cucamonga-Guasti Regional Park. These are among the most viewed places in Ontario on KAYAK.

Your guide to booking Milwaukee to Ontario flights

Get tips on when to book, when to fly and what to know before your trip.
  • If your dates are flexible, aim for a Saturday departure and avoid flying on Friday. On this route, Saturday flights average $368, about $131 less than Friday fares (26% savings) based on the last 12 months.
  • If you can choose when to travel, plan your Milwaukee to Ontario trip for January. Fares historically average $306 round-trip in that month - typically $368 less than the most expensive month, which is September (based on the last 12 months).
  • If you're arriving late at night and need somewhere to stay, check out these hotels close to Ontario Airport.

    • Ontario Airport Inn
    • Azure Hotel & Suites, Trademark Collection by Wyndham
    • Holiday Inn Ontario Airport By IHG

More options for your flight from Milwaukee to Ontario

Complete your trip to Ontario with a hotel stay or car rental

Car rentals in Ontario
Hotels in Ontario
Vacations in Ontario