ONT - MKE

$140 Find Cheap Flights from Ontario to Milwaukee - 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: $408-$566
Southwest
Mon 12/10Tue 2/20
ONT - MKE • 1 stop
Cheapest one-way
$140
Typical prices: $161-$349
Southwest
Sat 11/17
ONT - MKE • 1 stop
Nonstop flights
Not available
There are currently no direct flights between Ontario and Milwaukee. You'll need to take a connecting flight to reach the destination.
Insights
Insights
When to travel
November
Cheapest • 20% price drop
April
Most popular
Good to know
+1
Good to know
+1
Top layover airports
Salt Lake City (SLC)
Cheapest • Avg $376 (round-trip)
Las Vegas Harry Reid Intl (LAS)
Shortest trip • 5h 55m (one-way)
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Insights
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Flight Deals

Cheap Flights from Ontario to Milwaukee (ONT-MKE)

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

Recent round-trip flight deals from Ontario to Milwaukee

Thu, Dec 10 - Sat, Feb 20
Southwest Logo
5:45 am - 2:55 pmONT  Ontario-MKE Milwaukee-Mitchell
7h 10m1 stop Las Vegas Harry Reid Intl
Southwest Logo
5:40 am - 12:25 pmMKE  Milwaukee-Mitchell-ONT Ontario
8h 45m1 stop Chicago Midway
$279Southwest
Thu, Dec 17 - Sat, Dec 19
Southwest Logo
4:00 pm - 11:25 pmONT  Ontario-MKE Milwaukee-Mitchell
5h 25m1 stop Las Vegas Harry Reid Intl
Southwest Logo
8:00 pm - 11:45 pmMKE  Milwaukee-Mitchell-ONT Ontario
5h 45m1 stop Las Vegas Harry Reid Intl
$279Southwest
Wed, Dec 16 - Thu, Dec 17
Delta Logo
1:11 pm - 9:52 pmONT  Ontario-MKE Milwaukee-Mitchell
6h 41m1 stop Salt Lake City
Delta Logo
5:20 am - 11:07 amMKE  Milwaukee-Mitchell-ONT Ontario
7h 47m1 stop Atlanta Hartsfield-Jackson
$279Delta
Mon, Dec 14 - Thu, Dec 17
Delta Logo
1:11 pm - 9:52 pmONT  Ontario-MKE Milwaukee-Mitchell
6h 41m1 stop Salt Lake City
Delta Logo
5:20 am - 11:07 amMKE  Milwaukee-Mitchell-ONT Ontario
7h 47m1 stop Atlanta Hartsfield-Jackson
$279Delta
Thu, Nov 26 - Wed, Dec 2
Southwest Logo
9:05 am - 7:00 pmONT  Ontario-MKE Milwaukee-Mitchell
7h 55m1 stop Las Vegas Harry Reid Intl
Southwest Logo
5:15 am - 9:20 amMKE  Milwaukee-Mitchell-ONT Ontario
6h 05m1 stop Phoenix Sky Harbor Intl
$279Southwest
Tue, Dec 15 - Thu, Dec 17
Delta Logo
1:11 pm - 9:52 pmONT  Ontario-MKE Milwaukee-Mitchell
6h 41m1 stop Salt Lake City
Delta Logo
5:20 am - 11:07 amMKE  Milwaukee-Mitchell-ONT Ontario
7h 47m1 stop Atlanta Hartsfield-Jackson
$279Delta
Thu, Dec 10 - Sat, Feb 20
Southwest Logo
5:55 am - 3:40 pmONT  Ontario-MKE Milwaukee-Mitchell
7h 45m2 stops Phoenix Sky Harbor Intl Dallas Love Field
Southwest Logo
5:40 am - 12:25 pmMKE  Milwaukee-Mitchell-ONT Ontario
8h 45m1 stop Chicago Midway
$284Southwest
Fri, Jan 1 - Wed, Jan 6
American Airlines Logo
6:00 am - 4:24 pmONT  Ontario-MKE Milwaukee-Mitchell
8h 24m1 stop Chicago O'Hare Intl
American Airlines Logo
6:40 am - 3:29 pmMKE  Milwaukee-Mitchell-ONT Ontario
10h 49m2 stops Dallas/Fort Worth Phoenix Sky Harbor Intl
$341American Airlines
Thu, Dec 17 - Tue, Dec 22
American Airlines Logo
9:35 am - 8:00 pmONT  Ontario-MKE Milwaukee-Mitchell
8h 25m2 stops Phoenix Sky Harbor Intl Chicago O'Hare Intl
American Airlines Logo
2:09 pm - 9:57 pmMKE  Milwaukee-Mitchell-ONT Ontario
9h 48m2 stops Chicago O'Hare Intl Phoenix Sky Harbor Intl
$346American Airlines
Fri, Feb 19 - Mon, Feb 22
American Airlines Logo
9:28 am - 8:05 pmONT  Ontario-MKE Milwaukee-Mitchell
8h 37m2 stops Phoenix Sky Harbor Intl Chicago O'Hare Intl
American Airlines Logo
2:28 pm - 11:34 pmMKE  Milwaukee-Mitchell-ONT Ontario
11h 06m1 stop Chicago O'Hare Intl
$364American Airlines
Booking Insights

Price, demand and travel trends for Ontario to Milwaukee 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 Ontario to Milwaukee?

Round-trip flights from Ontario to Milwaukee typically range from $408 to $566. The lowest price found in the past 5 days was $279, on Southwest.

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

Based on deals KAYAK users found in the last 12 months, Wednesday is the cheapest day of the week to fly from Ontario to Milwaukee. It’s 22% cheaper than the average day, while Sunday is the most expensive, with prices 65% higher.

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Key details for Ontario to Milwaukee flights

Low season

January

Cheapest flight

$140
Beat the crowds with an average 46% drop in travelers.
The most popular month to fly with an average 39% increase in travelers.
One-way flight from Ontario to Milwaukee

When to book flights from Ontario to Milwaukee

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

Your Ontario to Milwaukee 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 Ontario to Milwaukee?

    Two cabin classes are available on flights from Ontario to Milwaukee:

    • Economy Class
    • First Class

  • How long is a flight from Ontario to Milwaukee?

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

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

    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 Ontario to Milwaukee flight?

    Round-trip flights from Ontario to Milwaukee range from $408 to $566, with an average of $470 over the past 12 months. Anything below $408 counts as a good deal.

  • Have flight prices from Ontario to Milwaukee 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 $1,388. That means the highest observed fare was about 5x higher than the lowest one.

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

    One-way fares from Ontario to Milwaukee are currently lower than usual. Average one-way flight prices are about $184, which is 26% below the typical average for this route.

  • What car rental options are available at Milwaukee-Mitchell Airport (MKE)?

    Milwaukee-Mitchell Airport (MKE) hosts 5 major car rental companies, with daily rates starting from around $26 for economy cars. Top options include:

    • Dollar
    • Hertz
    • Budget
    • Alamo
    • Sixt

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

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

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

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

    • Phoenix Sky Harbor Intl (PHX) - 41% of one-stop connections
    • Denver Intl (DEN) - 22% of one-stop connections
    • Las Vegas Harry Reid Intl (LAS) - 14% of one-stop connections
    • Atlanta Hartsfield-Jackson (ATL) - 8% of one-stop connections

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

    Yes. Flexible dates can save you up to 53% on flights from Ontario to Milwaukee. Wednesday is the cheapest departure day at $368 round-trip on average, while Sunday is the most expensive at $778, a difference of $410.

    KAYAK's flexible dates feature shows options up to 3 days before and after your selected dates, making it easier to compare nearby fares.

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

    Flying via Las Vegas Harry Reid Intl (LAS) gives the shortest average 1-stop total travel time at 5h 55m, compared with 6h 02m via Phoenix Sky Harbor Intl (PHX) and 6h 15m via Denver Intl (DEN).

  • What is the time difference between Ontario and Milwaukee?

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

  • What popular places can I visit in Milwaukee?

    Some of the most popular sights in Milwaukee are Fiserv Forum, Riverside Theater and Pabst Theater. These are among the most viewed places in Milwaukee on KAYAK.

Your guide to booking Ontario to Milwaukee 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 Wednesday departure and avoid flying on Sunday. On this route, Wednesday flights average $368, about $410 less than Sunday fares (53% savings) based on the last 12 months.
  • If you can choose when to travel, plan your Ontario to Milwaukee trip for November. Fares historically average $377 round-trip in that month - typically $277 less than the most expensive month, which is June (based on the last 12 months).
  • If you're arriving late at night and need somewhere to stay, check out these hotels close to Milwaukee-Mitchell Airport.

    • Best Western Plus Milwaukee Airport Hotel & Conference Center
    • Hampton Inn Milwaukee-Airport
    • Super 8 by Wyndham Milwaukee Airport

More options for your flight from Ontario to Milwaukee

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

Car rentals in Milwaukee
Hotels in Milwaukee
Vacations in Milwaukee