Southwest® flights from Ontario/LA to Baltimore/Washington from $174

Promo Code

Low fares from Ontario/LA to Baltimore/Washington

$

Ontario/LA (ONT)to

Baltimore/Washington (BWI)
Depart: 10/20/2026

One-way

Basic

From
$174
Seen: 11 hrs ago

Ontario/LA (ONT)to

Baltimore/Washington (BWI)
Depart: 11/14/2026

One-way

Basic

From
$174
Seen: 8 hrs ago

Ontario/LA (ONT)to

Baltimore/Washington (BWI)
Depart: 10/21/2026

One-way

Basic

From
$174
Seen: 11 hrs ago

Ontario/LA (ONT)to

Baltimore/Washington (BWI)
Depart: 09/14/2026

One-way

Basic

From
$174
Seen: 20 hrs ago

Ontario/LA (ONT)to

Baltimore/Washington (BWI)
Depart: 10/13/2026

One-way

Basic

From
$174
Seen: 11 hrs ago

Ontario/LA (ONT)to

Baltimore/Washington (BWI)
Depart: 10/24/2026

One-way

Basic

From
$174
Seen: 4 hrs ago

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Explore flights from Ontario/LA to Baltimore/Washington

Aug 2026
From$304*
Seen: 22 hrs ago
One Way/Basic
Sep 2026
From$174*
Seen: 20 hrs ago
One Way/Basic
Oct 2026
From$174*
Seen: 14 hrs ago
One Way/Basic
cmp-daily-histogram-bars-legend-min-price-aria-label $174
cmp-daily-histogram-bars-legend-max-price-aria-label $454
Displaying fares for August-2026
  • ONT–BWI, 08/22/2026: From $345
    22

    Sat

    AUG

  • ONT–BWI, 08/23/2026: From $330
    23

    Sun

  • ONT–BWI, 08/24/2026: From $304
    24

    Mon

  • ONT–BWI, 08/25/2026: From $304
    25

    Tue

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

    Wed

  • ONT–BWI, 08/27/2026: From $304
    27

    Thu

  • ONT–BWI, 08/28/2026: From $304
    28

    Fri

  • ONT–BWI: cmp-view-offers-disclaimer. Find Offers
    29

    Sat

  • ONT–BWI, 08/30/2026: From $325
    30

    Sun

  • ONT–BWI, 08/31/2026: From $304
    31

    Mon

  • ONT–BWI, 09/01/2026: From $304
    01

    Tue

    SEP

  • ONT–BWI, 09/02/2026: From $304
    02

    Wed

  • ONT–BWI, 09/03/2026: From $304
    03

    Thu

  • ONT–BWI, 09/04/2026: From $304
    04

    Fri

  • ONT–BWI: cmp-view-offers-disclaimer. Find Offers
    05

    Sat

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

    Sun

  • ONT–BWI, 09/07/2026: From $454
    07

    Mon

  • ONT–BWI, 09/08/2026: From $304
    08

    Tue

  • ONT–BWI, 09/09/2026: From $174
    09

    Wed

  • ONT–BWI, 09/10/2026: From $198
    10

    Thu

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

    Fri

  • ONT–BWI, 09/12/2026: From $179
    12

    Sat

  • ONT–BWI, 09/13/2026: From $300
    13

    Sun

  • ONT–BWI, 09/14/2026: From $174
    14

    Mon

  • ONT–BWI, 09/15/2026: From $174
    15

    Tue

  • ONT–BWI, 09/16/2026: From $229
    16

    Wed

  • ONT–BWI, 09/17/2026: From $235
    17

    Thu

  • ONT–BWI, 09/18/2026: From $206
    18

    Fri

  • ONT–BWI, 09/19/2026: From $198
    19

    Sat

  • ONT–BWI, 09/20/2026: From $300
    20

    Sun

  • ONT–BWI, 09/21/2026: From $179
    21

    Mon

    • Range$174-$454

    *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:
    Balt./Wash. International Airport
    Average flight time:
    4 hours 48 minutes
    Distance:
    2283 miles

    Route Information

    153† Weekly flights
    • 1‡ Nonstop flight per day Monday through Friday
    • 1‡ Nonstop flight on Saturday
    • 1‡ Nonstop flight on Sunday

    † Weekly flights based on DOT published scheduled average flights Monday through Sunday between 9/1/2025 and 9/30/2025. Note: route may not operate every day of the week.

    ‡ Nonstop flights based on DOT published scheduled average flights Monday through Sunday between 9/1/2025 and 9/30/2025.

    Questions we hear the most

    The average flight time from Ontario/LA to Baltimore/Washington is 4 hours 48 minutes.
    There are 153 weekly flights from Ontario/LA to Baltimore/Washington on Southwest Airlines.
    Yes, Southwest flies nonstop from Ontario/LA to Baltimore/Washington once per day from Monday through Friday.
    Yes, Southwest flies nonstop from Ontario/LA to Baltimore/Washington once per day on Saturdays and Sundays.
    To find the lowest fares by day and time to fly Ontario/LA to Baltimore/Washington with Southwest, check out our Low Fare Calendar.
    You can rent a car at Balt./Wash. International Airport book yours with your flight.
    Yes! Flights from Ontario/LA to Baltimore/Washington—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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