$259 Cheap Flights from Sioux Falls (FSD) to Sidney (SDY)

View $259 flight on Tue, Dec 16, 2025Opens in a new window

Popular airlines from Sioux Falls Regional Airport (FSD) to Sidney, MT (SDY-Sidney-Richland Municipal)

Cheap Flights from Sioux Falls to Sidney (FSD-SDY)

Prices were available within the past 7 days and start at $259 for one-way flights and $686 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Fri, Nov 7 - Fri, Nov 14
FSD
Sioux Falls
SDY
Sidney
$686 Roundtrip, found 4 days ago
$686
Roundtrip
found 4 days ago
Select United flight, departing Fri, Nov 7 from Sioux Falls to Sidney, returning Fri, Nov 14, priced at $686 found 4 days ago
United
Fri, Nov 7 - Fri, Nov 14
FSD
Sioux Falls
SDY
Sidney
$733 Roundtrip, found 4 days ago
$733
Roundtrip
found 4 days ago
Select United flight, departing Fri, Nov 7 from Sioux Falls to Sidney, returning Fri, Nov 14, priced at $733 found 4 days ago
United
Fri, Nov 7 - Fri, Nov 14
FSD
Sioux Falls
SDY
Sidney
$781 Roundtrip, found 4 days ago
$781
Roundtrip
found 4 days ago
Select United flight, departing Fri, Nov 7 from Sioux Falls to Sidney, returning Fri, Nov 14, priced at $781 found 4 days ago
United
Fri, Nov 7 - Fri, Nov 14
FSD
Sioux Falls
SDY
Sidney
$828 Roundtrip, found 4 days ago
$828
Roundtrip
found 4 days ago
Select United flight, departing Fri, Nov 7 from Sioux Falls to Sidney, returning Fri, Nov 14, priced at $828 found 4 days ago
United
Fri, Nov 7 - Fri, Nov 14
FSD
Sioux Falls
SDY
Sidney
$951 Roundtrip, found 4 days ago
$951
Roundtrip
found 4 days ago
Select United flight, departing Fri, Nov 7 from Sioux Falls to Sidney, returning Fri, Nov 14, priced at $951 found 4 days ago
United
Fri, Nov 7 - Fri, Nov 14
FSD
Sioux Falls
SDY
Sidney
$978 Roundtrip, found 4 days ago
$978
Roundtrip
found 4 days ago
Select United flight, departing Fri, Nov 7 from Sioux Falls to Sidney, returning Fri, Nov 14, priced at $978 found 4 days ago
United
Fri, Nov 7 - Fri, Nov 14
FSD
Sioux Falls
SDY
Sidney
$998 Roundtrip, found 4 days ago
$998
Roundtrip
found 4 days ago
Select United flight, departing Fri, Nov 7 from Sioux Falls to Sidney, returning Fri, Nov 14, priced at $998 found 4 days ago
United
Fri, Nov 7 - Fri, Nov 14
FSD
Sioux Falls
SDY
Sidney
$1,025 Roundtrip, found 4 days ago
$1,025
Roundtrip
found 4 days ago
Select United flight, departing Fri, Nov 7 from Sioux Falls to Sidney, returning Fri, Nov 14, priced at $1,025 found 4 days ago
United
Fri, Nov 7 - Fri, Nov 14
FSD
Sioux Falls
SDY
Sidney
$1,073 Roundtrip, found 4 days ago
$1,073
Roundtrip
found 4 days ago
Select United flight, departing Fri, Nov 7 from Sioux Falls to Sidney, returning Fri, Nov 14, priced at $1,073 found 4 days ago
American Airlines
Fri, Nov 7 - Fri, Nov 14
FSD
Sioux Falls
SDY
Sidney
$1,112 Roundtrip, found 4 days ago
$1,112
Roundtrip
found 4 days ago
Select American Airlines flight, departing Fri, Nov 7 from Sioux Falls to Sidney, returning Fri, Nov 14, priced at $1,112 found 4 days ago

Frequently asked questions

How much does a flight from Sioux Falls Regional Airport (FSD) to Sidney-Richland Municipal Airport (SDY) cost?
Get a cheap one-way flight from $259 or cheap return flight from $686 from Sioux Falls Regional Airport (FSD) to Sidney-Richland Municipal Airport (SDY) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to see our cheapest flight offers on this route.
What is the cheapest month to fly from Sioux Falls Regional Airport (FSD) to Sidney-Richland Municipal Airport (SDY)?
The cheapest month to fly from FSD to SDY is November, when demand is low. Off-peak months are typically when better flight deals are available between these airports.
What is the cheapest airline that flies from Sioux Falls Regional Airport (FSD) to Sidney-Richland Municipal Airport (SDY)?
To find the cheapest airline that'll fly you from FSD to SDY, use Expedia's filter tool. Tailor your search based on what matters most to you, such as preferred carriers and cabin class. You can then sort your results by "Price (lowest to highest)" to discover the cheapest flight right away.
How many flights per day from Sioux Falls Regional Airport (FSD) to Sidney-Richland Municipal Airport (SDY)?
There are no daily direct flights departing from Sioux Falls Regional Airport (FSD) to Sidney-Richland Municipal Airport (SDY). But you can opt for flights with layovers. Filter your search results on Expedia to include one or more stops, and you'll be cruising above the clouds before you know it.
What day of the week has the most flights from FSD to SDY?
Generally you'll find the largest variety of flight choices on a Friday. Tuesdays are often the quietest.* However, this can change based on the season, carrier and other factors.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Sioux Falls Regional Airport (FSD) to Sidney-Richland Municipal Airport (SDY)?
To reach Sidney-Richland Municipal Airport (SDY) on schedule, choose a flight that takes off from Sioux Falls Regional Airport (FSD) before 3 PM. The chance of cancellations is 22% higher, on average, for departures after this time.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
Is it cheaper to buy a plane ticket from Sioux Falls Regional Airport (FSD) to Sidney-Richland Municipal Airport (SDY) last-minute?
Last-minute fares from FSD to SDY are generally more expensive. To secure the best prices, start searching for flights early. That being said, if your travel plans are flexible, it's possible to land a cheap ticket just before your departure.
Is it cheaper to book a FSD to SDY flight and hotel package?
You can save money by securing a FSD to SDY flight and hotel package compared to booking separately. In fact, you could save hundreds of dollars by bundling with Expedia. And it's easy to manage everything in one convenient place. Once you've selected your ideal flights and accommodations, consider adding extras such as activities, tours and car rentals.
Can I cancel or change the date of my flight from Sioux Falls Regional Airport (FSD) to Sidney-Richland Municipal Airport (SDY)?
Typically, it's possible to cancel or reschedule your FSD to SDY flight. However, if it's been more than 24 hours since booking, additional charges may apply. Check your airline's policies in your itinerary to see what changes are possible and whether any costs are involved. You'll also find more details on our Customer Service portal.

Travel information

Origin airport
Sioux Falls Regional
Destination airport
Sidney-Richland Municipal
Roundtrip price
$685
Distance
459 mi

Book with confidence

Sioux Falls to Sidney Flights

The cheapest times to fly from Sioux Falls to Sidney

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Sioux Falls to Sidney are during the month of November. You can find some of the cheapest flights from Sioux Falls to Sidney with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Sioux Falls to Sidney

Sunday is one of the best days to book for cheap flights from Sioux Falls to Sidney: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from Sioux Falls to Sidney

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Sioux Falls to Sidney in 2025. You can also book with separate airlines for your outbound and return journeys, from $259 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Sioux Falls to Sidney flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your Sioux Falls to Sidney airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Sioux Falls to Sidney Flights

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*Available to One Key members.