$136 Cheap United flights Ontario (ONT) to Sioux Falls (FSD)

View $136 flight on Tue, Sep 16, 2025Opens in a new window

  • Plan, book, fly with confidence

  • trending down icon

    Be in the know

    Get alerts if flight prices drop or rise*
  • bex rewards loyalty icon

    Book smarter

    Save up to 30% on select hotels after you book a flight*
  • one key icon

    Earn twice

    Earn your airline miles on top of our OneKeyCash
    Learn about One Key

$136 Cheap United flights Ontario (ONT) to Sioux Falls (FSD)

Prices were available within the past 7 days and start at $136 for one-way flights and $255 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Wed, Oct 8 - Sun, Oct 12
ONT
Ontario
FSD
Sioux Falls
$255 Roundtrip, found 1 day ago
$255
Roundtrip
found 1 day ago
Select United flight, departing Wed, Oct 8 from Ontario to Sioux Falls, returning Sun, Oct 12, priced at $255 found 1 day ago
United
Wed, Aug 27 - Wed, Sep 3
ONT
Ontario
FSD
Sioux Falls
$269 Roundtrip, found 1 day ago
$269
Roundtrip
found 1 day ago
Select United flight, departing Wed, Aug 27 from Ontario to Sioux Falls, returning Wed, Sep 3, priced at $269 found 1 day ago
United
Wed, Oct 29 - Tue, Nov 4
ONT
Ontario
FSD
Sioux Falls
$278 Roundtrip, found 3 days ago
$278
Roundtrip
found 3 days ago
Select United flight, departing Wed, Oct 29 from Ontario to Sioux Falls, returning Tue, Nov 4, priced at $278 found 3 days ago
United
Wed, Sep 10 - Tue, Sep 16
ONT
Ontario
FSD
Sioux Falls
$279 Roundtrip, found 4 days ago
$279
Roundtrip
found 4 days ago
Select United flight, departing Wed, Sep 10 from Ontario to Sioux Falls, returning Tue, Sep 16, priced at $279 found 4 days ago
United
Wed, Sep 17 - Tue, Sep 23
ONT
Ontario
FSD
Sioux Falls
$281 Roundtrip, found 1 day ago
$281
Roundtrip
found 1 day ago
Select United flight, departing Wed, Sep 17 from Ontario to Sioux Falls, returning Tue, Sep 23, priced at $281 found 1 day ago
United
Wed, Sep 17 - Tue, Sep 23
ONT
Ontario
FSD
Sioux Falls
$287 Roundtrip, found 1 day ago
$287
Roundtrip
found 1 day ago
Select United flight, departing Wed, Sep 17 from Ontario to Sioux Falls, returning Tue, Sep 23, priced at $287 found 1 day ago
Flights from Ontario (ONT) to Sioux Falls (FSD)
Origin airport
Los Angeles - Ontario Intl.
Destination airport
Sioux Falls Regional
Airlines serving
American Airlines, Delta, Frontier Airlines, United
Popular airline
United
Distance
1295 mi

Frequently asked questions

How much is a United Airlines flight from Los Angeles - Ontario Intl. Airport (ONT) to Sioux Falls Regional Airport (FSD)?
Landing cheap one-way United Airlines flights from ONT to FSD from $136 on Expedia is simple — just filter by "Price (lowest to highest)." Alternatively, check out our affordable return fares from $255 for your next break.**These prices were available on Expedia within the past 7 days, for flights departing within the next year. Prices and availability are subject to change. Additional terms apply.
What is the cheapest month to fly from ONT to FSD with United Airlines?
United Airlines flights to Sioux Falls are generally more affordable in the quieter months of January and December. Whether you're in search of a one-way or a return ticket, you could score a better deal then.
What is the cheapest time to book flights from Los Angeles - Ontario Intl. Airport (ONT) to Sioux Falls Regional Airport (FSD) with United Airlines?
For cheap United Airlines fares from Los Angeles - Ontario Intl. Airport (ONT) to Sioux Falls Regional Airport (FSD), start searching one to three months before your planned departure. Reserving domestic flights 34 to 86 days in advance could save you 25% compared to booking just 6 to 12 days ahead. The day you book can also impact how much you pay. Sunday is generally the cheapest, while Monday is often the most expensive for domestic flights. You can save 6% on average by booking your trip on a Sunday.**Ideal booking window recommendation is based on average round-trip ticket prices for January through November for 2024. Best day of the week to book recommendation is based on average round-trip ticket prices for January through October 2024. All data sourced from ARC's global airline sales database.
Does United Airlines fly nonstop from Los Angeles - Ontario Intl. Airport (ONT) to Sioux Falls Regional Airport (FSD)?
Simply enter your dates, press search and check the "Nonstop" filter on Expedia to browse any direct flights from ONT to FSD with United Airlines or other airlines.
What is the earliest United Airlines flight from ONT to FSD?
Find United Airlines's earliest flights from ONT to FSD by checking our "Morning" and "Early Morning" filters. Not only will you arrive at your destination sooner, early departures also have a 20% less chance of being canceled.**Most reliable time of the day recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
What airports does United Airlines fly into in Sioux Falls?
Hop on a United Airlines flight from Los Angeles - Ontario Intl. Airport (ONT) to Sioux Falls, and you'll probably land at Sioux Falls Regional Airport (FSD). This is the airline's main hub here.
Why fly with United Airlines from ONT to FSD?
A rewarding loyalty program and the ability to collect points through United Mileage Plus are the start of the reasons to depart from ONT to FSD with United Airlines. Plus, when you join our One Key™ program, you can earn OneKeyCash™* on top of United Airlines's loyalty program earnings. It's yours to use wherever your next trip takes you.*OneKeyCash™ disclaimer - OneKeyCash™ is not redeemable for cash and can only be used on Expedia, Hotels.com and Vrbo.
Can I change or cancel my United Airlines flight from Los Angeles - Ontario Intl. Airport (ONT) to Sioux Falls Regional Airport (FSD)?
In most cases, you can change or cancel your flight, although there may be additional charges if you made your booking more than 24 hours ago. Need to keep your options open? Use Expedia's "Changes included" or "No cancel fee" filter to find flights that won't charge extra if you need to adjust your plans. To make modifications, visit "Trips," select your flight and click on "Manage Booking" for more details.

Explore a world of travel with Expedia

*Available to One Key members.