Southwest® flights from Ontario/LA to Baltimore/Washington from $198

Promo Code

Low fares from Ontario/LA to Baltimore/Washington

$

Ontario/LA (ONT)to

Baltimore/Washington (BWI)
Depart: 10/22/2026

One-way

Basic

From
$198
Seen: 17 hrs ago

Ontario/LA (ONT)to

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

One-way

Basic

From
$198
Seen: 19 hrs ago

Ontario/LA (ONT)to

Baltimore/Washington (BWI)
Depart: 11/05/2026

One-way

Basic

From
$198
Seen: 6 hrs ago

Ontario/LA (ONT)to

Baltimore/Washington (BWI)
Depart: 10/29/2026

One-way

Basic

From
$198
Seen: 14 hrs ago

Ontario/LA (ONT)to

Baltimore/Washington (BWI)
Depart: 11/07/2026

One-way

Basic

From
$198
Seen: 20 hrs ago

Ontario/LA (ONT)to

Baltimore/Washington (BWI)
Depart: 11/19/2026

One-way

Basic

From
$198
Seen: 15 hrs ago

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Explore flights from Ontario/LA to Baltimore/Washington

Sep 2026
From$299*
Seen: 16 hrs ago
One Way/Basic
Oct 2026
From$198*
Seen: 14 hrs ago
One Way/Basic
Nov 2026
From$198*
Seen: 20 hrs ago
One Way/Basic
cmp-daily-histogram-bars-legend-min-price-aria-label $250
cmp-daily-histogram-bars-legend-max-price-aria-label $370
Displaying fares for September-2026
  • ONT–BWI, 09/11/2026: From $304
    11

    Fri

    SEP

  • ONT–BWI, 09/12/2026: From $299
    12

    Sat

  • ONT–BWI, 09/13/2026: From $370
    13

    Sun

  • ONT–BWI: cmp-view-offers-disclaimer. Find Offers
    14

    Mon

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

    Tue

  • ONT–BWI, 09/16/2026: From $304
    16

    Wed

  • ONT–BWI, 09/17/2026: From $370
    17

    Thu

  • ONT–BWI, 09/18/2026: From $360
    18

    Fri

  • ONT–BWI, 09/19/2026: From $299
    19

    Sat

  • ONT–BWI: cmp-view-offers-disclaimer. Find Offers
    20

    Sun

  • ONT–BWI: cmp-view-offers-disclaimer. Find Offers
    21

    Mon

  • ONT–BWI, 09/22/2026: From $304
    22

    Tue

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

    Wed

  • ONT–BWI, 09/24/2026: From $304
    24

    Thu

  • ONT–BWI, 09/25/2026: From $314
    25

    Fri

  • ONT–BWI, 09/26/2026: From $299
    26

    Sat

  • ONT–BWI: cmp-view-offers-disclaimer. Find Offers
    27

    Sun

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

    Mon

  • ONT–BWI, 09/29/2026: From $304
    29

    Tue

  • ONT–BWI, 09/30/2026: From $304
    30

    Wed

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

    Thu

    OCT

  • ONT–BWI, 10/02/2026: From $266
    02

    Fri

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

    Sat

  • ONT–BWI, 10/04/2026: From $310
    04

    Sun

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    05

    Mon

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    06

    Tue

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    07

    Wed

  • ONT–BWI, 10/08/2026: From $266
    08

    Thu

  • ONT–BWI, 10/09/2026: From $250
    09

    Fri

  • ONT–BWI: cmp-view-offers-disclaimer. Find Offers
    10

    Sat

    • Range$250-$370

    *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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