Southwest® flights from Boston to Ontario/LA from $160

Promo Code

Low fares from Boston to Ontario/LA

$

Boston (BOS)to

Ontario/LA (ONT)
Depart: 10/30/2026

One-way

Basic

From
$160
Seen: 8 hrs ago

Boston (BOS)to

Ontario/LA (ONT)
Depart: 10/23/2026

One-way

Basic

From
$181
Seen: 2 hrs ago

Boston (BOS)to

Ontario/LA (ONT)
Depart: 10/21/2026

One-way

Basic

From
$199
Seen: 5 hrs ago

Boston (BOS)to

Ontario/LA (ONT)
Depart: 11/05/2026

One-way

Basic

From
$199
Seen: 16 hrs ago

Boston (BOS)to

Ontario/LA (ONT)
Depart: 10/30/2026

One-way

Choice

From
$213
Seen: 8 hrs ago

Boston (BOS)to

Ontario/LA (ONT)
Depart: 10/03/2026

One-way

Basic

From
$220
Seen: 7 hrs ago

Looking for more low-fare flights?

Check out the Low Fare Calendar to find a fare that works for you. Just choose the month you want to depart and return, and we’ll show you the best fares available.

Find low fares

Explore flights from Boston to Ontario/LA

Sep 2026
From$283*
Seen: 12 hrs ago
One Way/Basic
Oct 2026
From$160*
Seen: 8 hrs ago
One Way/Basic
Nov 2026
From$199*
Seen: 16 hrs ago
One Way/Basic
cmp-daily-histogram-bars-legend-min-price-aria-label $220
cmp-daily-histogram-bars-legend-max-price-aria-label $470
Displaying fares for September-2026
  • BOS–ONT: cmp-view-offers-disclaimer. Find Offers
    18

    Fri

    SEP

  • BOS–ONT, 09/19/2026: From $283
    19

    Sat

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

    Sun

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

    Mon

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

    Tue

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

    Wed

  • BOS–ONT: cmp-view-offers-disclaimer. Find Offers
    24

    Thu

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

    Fri

  • BOS–ONT, 09/26/2026: From $283
    26

    Sat

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

    Sun

  • BOS–ONT, 09/28/2026: From $375
    28

    Mon

  • BOS–ONT, 09/29/2026: From $283
    29

    Tue

  • BOS–ONT, 09/30/2026: From $283
    30

    Wed

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

    Thu

    OCT

  • BOS–ONT, 10/02/2026: From $260
    02

    Fri

  • BOS–ONT, 10/03/2026: From $220
    03

    Sat

  • BOS–ONT, 10/04/2026: From $334
    04

    Sun

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

    Mon

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

    Tue

  • BOS–ONT: cmp-view-offers-disclaimer. Find Offers
    07

    Wed

  • BOS–ONT, 10/08/2026: From $370
    08

    Thu

  • BOS–ONT, 10/09/2026: From $465
    09

    Fri

  • BOS–ONT, 10/10/2026: From $334
    10

    Sat

  • BOS–ONT, 10/11/2026: From $465
    11

    Sun

  • BOS–ONT, 10/12/2026: From $470
    12

    Mon

  • BOS–ONT, 10/13/2026: From $305
    13

    Tue

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

    Wed

  • BOS–ONT, 10/15/2026: From $300
    15

    Thu

  • BOS–ONT, 10/16/2026: From $250
    16

    Fri

  • BOS–ONT: cmp-view-offers-disclaimer. Find Offers
    17

    Sat

    • Range$220-$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:
    Logan International Airport
    Arriving at:
    LA/Ontario International Airport
    Distance:
    2566 miles

    Route Information

    90† Weekly flights

    † 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

    There are 90 weekly flights from Boston to Ontario/LA on Southwest Airlines.
    To find the lowest fares by day and time to fly Boston to Ontario/LA with Southwest, check out our Low Fare Calendar.
    You can rent a car at LA/Ontario International Airport book yours with your flight.
    Yes! Flights from Boston to Ontario/LA—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.

    Explore Flights from Other Popular Origins

    Popular Flights from Boston