Southwest® flights from Ontario/LA to Milwaukee from $140

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Low fares from Ontario/LA to Milwaukee

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Ontario/LA (ONT)to

Milwaukee (MKE)
Depart: 12/02/2026

One-way

Basic

From
$140
Seen: 22 hrs ago

Ontario/LA (ONT)to

Milwaukee (MKE)
Depart: 12/24/2026

One-way

Basic

From
$140
Seen: 19 hrs ago

Ontario/LA (ONT)to

Milwaukee (MKE)
Depart: 11/10/2026

One-way

Basic

From
$140
Seen: 5 hrs ago

Ontario/LA (ONT)to

Milwaukee (MKE)
Depart: 11/26/2026

One-way

Basic

From
$140
Seen: 4 hrs ago

Ontario/LA (ONT)to

Milwaukee (MKE)
Depart: 12/17/2026

One-way

Basic

From
$140
Seen: 13 hrs ago

Ontario/LA (ONT)to

Milwaukee (MKE)
Depart: 12/16/2026

One-way

Basic

From
$140
Seen: 10 hrs ago

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Explore flights from Ontario/LA to Milwaukee

Oct 2026
From$304*
Seen: 16 hrs ago
One Way/Basic
Nov 2026
From$140*
Seen: 5 hrs ago
One Way/Basic
Dec 2026
From$140*
Seen: 10 hrs ago
One Way/Basic
cmp-daily-histogram-bars-legend-min-price-aria-label $140
cmp-daily-histogram-bars-legend-max-price-aria-label $470
Displaying fares for October-2026
  • ONT–MKE: cmp-view-offers-disclaimer. Find Offers
    20

    Tue

    OCT

  • ONT–MKE, 10/21/2026: From $470
    21

    Wed

  • ONT–MKE: cmp-view-offers-disclaimer. Find Offers
    22

    Thu

  • ONT–MKE: cmp-view-offers-disclaimer. Find Offers
    23

    Fri

  • ONT–MKE, 10/24/2026: From $304
    24

    Sat

  • ONT–MKE: cmp-view-offers-disclaimer. Find Offers
    25

    Sun

  • ONT–MKE: cmp-view-offers-disclaimer. Find Offers
    26

    Mon

  • ONT–MKE, 10/27/2026: From $304
    27

    Tue

  • ONT–MKE: cmp-view-offers-disclaimer. Find Offers
    28

    Wed

  • ONT–MKE, 10/29/2026: From $392
    29

    Thu

  • ONT–MKE, 10/30/2026: From $392
    30

    Fri

  • ONT–MKE: cmp-view-offers-disclaimer. Find Offers
    31

    Sat

  • ONT–MKE: cmp-view-offers-disclaimer. Find Offers
    01

    Sun

    NOV

  • ONT–MKE: cmp-view-offers-disclaimer. Find Offers
    02

    Mon

  • ONT–MKE: cmp-view-offers-disclaimer. Find Offers
    03

    Tue

  • ONT–MKE: cmp-view-offers-disclaimer. Find Offers
    04

    Wed

  • ONT–MKE, 11/05/2026: From $324
    05

    Thu

  • ONT–MKE: cmp-view-offers-disclaimer. Find Offers
    06

    Fri

  • ONT–MKE, 11/07/2026: From $304
    07

    Sat

  • ONT–MKE: cmp-view-offers-disclaimer. Find Offers
    08

    Sun

  • ONT–MKE: cmp-view-offers-disclaimer. Find Offers
    09

    Mon

  • ONT–MKE, 11/10/2026: From $140
    10

    Tue

  • ONT–MKE: cmp-view-offers-disclaimer. Find Offers
    11

    Wed

  • ONT–MKE, 11/12/2026: From $140
    12

    Thu

  • ONT–MKE: cmp-view-offers-disclaimer. Find Offers
    13

    Fri

  • ONT–MKE, 11/14/2026: From $145
    14

    Sat

  • ONT–MKE: cmp-view-offers-disclaimer. Find Offers
    15

    Sun

  • ONT–MKE, 11/16/2026: From $295
    16

    Mon

  • ONT–MKE, 11/17/2026: From $180
    17

    Tue

  • ONT–MKE: cmp-view-offers-disclaimer. Find Offers
    18

    Wed

  • ONT–MKE: cmp-view-offers-disclaimer. Find Offers
    19

    Thu

    • Range$140-$470

    *Fares displayed have been collected within the last 24 hours and may no longer be available at time of booking. Additional fees and charges for optional products and services may apply. Modifying this information may result in a different fare. To find the most updated fare, please visit Southwest.com. Fares listed are Basic, which are subject to additional terms and conditions.

    Flight Details

    Departing from:
    LA/Ontario International Airport
    Arriving at:
    General Mitchell Airport
    Distance:
    1712 miles

    Questions we hear the most

    There are 130 weekly flights from Ontario/LA to Milwaukee on Southwest Airlines.
    To find the lowest fares by day and time to fly Ontario/LA to Milwaukee with Southwest, check out our Low Fare Calendar.
    You can rent a car at General Mitchell Airport book yours with your flight.
    Yes! Flights from Ontario/LA to Milwaukee—or from here or there to anywhere—can be changed with no change fees. Fare difference may apply.
    Check the status of your upcoming Southwest flight.
    Check out the Southwest Airlines® Help Center for answers about everything Southwest.

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