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Find low faresSouthwest® flights from Ontario/LA starting at $59
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Book flights from Ontario/LA with Southwest Airlines
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$
Ontario/LA (ONT)to
Phoenix (PHX)Depart: 04/21/2026
From
$59
Seen: 3 hrs ago
One-way
Basic
Ontario/LA (ONT)to
Las Vegas (LAS)Depart: 04/01/2026
From
$69
Seen: 3 hrs ago
One-way
Basic
Ontario/LA (ONT)to
Dallas (Love Field) (DAL)Depart: 02/28/2026
From
$76
Seen: 3 hrs ago
One-way
Basic
Ontario/LA (ONT)to
Denver (DEN)Depart: 03/07/2026
From
$79
Seen: 8 hrs ago
One-way
Basic
Ontario/LA (ONT)to
Portland, OR (PDX)Depart: 02/28/2026
From
$84
Seen: 19 hrs ago
One-way
Basic
Ontario/LA (ONT)to
Sacramento (SMF)Depart: 04/15/2026
From
$85
Seen: 4 hrs ago
One-way
Basic
Ontario/LA (ONT)to
San Jose, CA (SJC)Depart: 04/15/2026
From
$85
Seen: 3 hrs ago
One-way
Basic
Ontario/LA (ONT)to
Seattle/Tacoma (SEA)Depart: 02/24/2026
From
$89
Seen: 21 hrs ago
One-way
Basic
Ontario/LA (ONT)to
Spokane (GEG)Depart: 03/31/2026
From
$99
Seen: 8 hrs ago
One-way
Basic
Ontario/LA (ONT)to
Salt Lake City (SLC)Depart: 03/02/2026
From
$110
Seen: 22 hrs ago
One-way
Basic
Ontario/LA (ONT)to
Reno/Tahoe (RNO)Depart: 03/03/2026
From
$110
Seen: 2 hrs ago
One-way
Basic
Ontario/LA (ONT)to
San Francisco (SFO)Depart: 04/15/2026
From
$118
Seen: 22 hrs ago
One-way
Basic
*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.
Traveling from Ontario/LA
Southwest Airlines is proud to serve Ontario International Airport.
Whether you’d like to see what else the West has to offer or try the Midwest on for size, there’s no need to brave the mid-city traffic when you can catch a convenient Southwest flight closer to home. Even though you’re leaving, everything’s a little easier when you’re closer to home. Find a Southwest flight that works for you out of Ontario International Airport.
Not sure where to head next? Explore the list of places that Southwest flies out of Ontario International Airport and see which locale inflicts you with a bit of a travel bug. Find yourself just the change of scenery that’ll suit your needs, whether that’s a jaunt up to the Pacific Northwest, a trip over to the Rockies, or a visit to the Great Lakes. Trade Tinseltown for any town to which Southwest flies, so long as it’s the town that’s right for you.
Details about LA/Ontario International Airport
Airport code:
ONT
City:
Ontario/LA
State:
California
Concourse:
Terminal 4
Gates:
Gates 403-407
Cities with weekly flights from ONT:
115†
Cities with daily nonstop flights Monday through Friday from ONT:
12‡
Cities with daily nonstop flights Saturday through Sunday from ONT:
23§
† Weekly flights based on DOT published scheduled average flights Monday through Sunday between 10/1/2025 and 10/31/2025. Note: route may not operate every day of the week.
‡ Nonstop flights based on DOT published scheduled average flights Monday through Sunday between 10/1/2025 and 10/31/2025.
Popular Destinations from Ontario/LA
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From | To | Fare Type | Dates | Price | |
|---|---|---|---|---|---|
| Ontario/LA (ONT) | Phoenix (PHX) | One-way / Basic | Depart: 04/21/2026 | From $59 Seen: 3 hrs ago | |
| Ontario/LA (ONT) | Las Vegas (LAS) | One-way / Basic | Depart: 04/01/2026 | From $69 Seen: 3 hrs ago | |
| Ontario/LA (ONT) | Dallas (Love Field) (DAL) | One-way / Basic | Depart: 02/28/2026 | From $76 Seen: 3 hrs ago | |
| Ontario/LA (ONT) | Denver (DEN) | One-way / Basic | Depart: 03/07/2026 | From $79 Seen: 8 hrs ago | |
| Ontario/LA (ONT) | Portland, OR (PDX) | One-way / Basic | Depart: 04/10/2026 | From $84 Seen: 10 hrs ago | |
| Ontario/LA (ONT) | Sacramento (SMF) | One-way / Basic | Depart: 05/20/2026 | From $85 Seen: 4 hrs ago | |
| Ontario/LA (ONT) | San Jose, CA (SJC) | One-way / Basic | Depart: 04/15/2026 | From $85 Seen: 3 hrs ago | |
| Ontario/LA (ONT) | Seattle/Tacoma (SEA) | One-way / Basic | Depart: 02/24/2026 | From $89 Seen: 21 hrs ago |
*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.
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