$127 Cheap Flights from Sioux Falls (FSD) to Seattle (SEA)

View $127 flight on Fri, Oct 24, 2025Opens in a new window

Popular airlines from Sioux Falls Regional Airport (FSD) to Seattle-Tacoma International Airport (SEA)

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Cheap Flights from Sioux Falls to Seattle (FSD-SEA)

Prices were available within the past 7 days and start at $127 for one-way flights and $218 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Frontier Airlines
Wed, Aug 13 - Wed, Aug 27
FSD
Sioux Falls
SEA
Seattle
$218 Roundtrip, found 5 days ago
$218
Roundtrip
found 5 days ago
Select Frontier Airlines flight, departing Wed, Aug 13 from Sioux Falls to Seattle, returning Wed, Aug 27, priced at $218 found 5 days ago
Frontier Airlines
Mon, Aug 18 - Wed, Aug 27
FSD
Sioux Falls
SEA
Seattle
$225 Roundtrip, found 5 days ago
$225
Roundtrip
found 5 days ago
Select Frontier Airlines flight, departing Mon, Aug 18 from Sioux Falls to Seattle, returning Wed, Aug 27, priced at $225 found 5 days ago
Frontier Airlines
Fri, Aug 15 - Wed, Aug 27
FSD
Sioux Falls
SEA
Seattle
$231 Roundtrip, found 6 days ago
$231
Roundtrip
found 6 days ago
Select Frontier Airlines flight, departing Fri, Aug 15 from Sioux Falls to Seattle, returning Wed, Aug 27, priced at $231 found 6 days ago
Frontier Airlines
Thu, Aug 7 - Wed, Aug 20
FSD
Sioux Falls
SEA
Seattle
$236 Roundtrip, found 5 days ago
$236
Roundtrip
found 5 days ago
Select Frontier Airlines flight, departing Thu, Aug 7 from Sioux Falls to Seattle, returning Wed, Aug 20, priced at $236 found 5 days ago
Frontier Airlines
Thu, Aug 7 - Thu, Aug 14
FSD
Sioux Falls
SEA
Seattle
$246 Roundtrip, found 5 days ago
$246
Roundtrip
found 5 days ago
Select Frontier Airlines flight, departing Thu, Aug 7 from Sioux Falls to Seattle, returning Thu, Aug 14, priced at $246 found 5 days ago
Frontier Airlines
Wed, Aug 13 - Fri, Aug 29
FSD
Sioux Falls
SEA
Seattle
$249 Roundtrip, found 6 days ago
$249
Roundtrip
found 6 days ago
Select Frontier Airlines flight, departing Wed, Aug 13 from Sioux Falls to Seattle, returning Fri, Aug 29, priced at $249 found 6 days ago
United
Tue, Aug 19 - Tue, Aug 26
FSD
Sioux Falls
SEA
Seattle
$269 Roundtrip, found 17 hours ago
$269
Roundtrip
found 17 hours ago
Select United flight, departing Tue, Aug 19 from Sioux Falls to Seattle, returning Tue, Aug 26, priced at $269 found 17 hours ago
American Airlines
Thu, Oct 23 - Mon, Oct 27
FSD
Sioux Falls
SEA
Seattle
$269 Roundtrip, found 5 hours ago
$269
Roundtrip
found 5 hours ago
Select American Airlines flight, departing Thu, Oct 23 from Sioux Falls to Seattle, returning Mon, Oct 27, priced at $269 found 5 hours ago
Delta
Fri, Oct 3 - Sat, Oct 11
FSD
Sioux Falls
SEA
Seattle
$308 Roundtrip, found 12 hours ago
$308
Roundtrip
found 12 hours ago
Select Delta flight, departing Fri, Oct 3 from Sioux Falls to Seattle, returning Sat, Oct 11, priced at $308 found 12 hours ago
Alaska Airlines
Tue, Sep 16 - Sat, Sep 20
FSD
Sioux Falls
SEA
Seattle
$349 Roundtrip, just found
$349
Roundtrip
just found
Select Alaska Airlines flight, departing Tue, Sep 16 from Sioux Falls to Seattle, returning Sat, Sep 20, priced at $349 just found

Find the cheapest month to fly from Sioux Falls (FSD) to Seattle (SEA)

November is typically the cheapest month to fly

From $178 - $709 per traveler.

Graph displaying average flight prices per month

Flights from Sioux Falls (FSD) to Seattle (SEA)
Origin airport
Sioux Falls Regional
Destination airport
Seattle - Tacoma Intl.
Airlines serving
Alaska Airlines, American Airlines, Delta, Frontier Airlines, United
Roundtrip price
$217
Distance
1260 mi

Sioux Falls to Seattle Flights

The cheapest times to fly from Sioux Falls to Seattle

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 Seattle are during the month of August. You can find some of the cheapest flights from Sioux Falls to Seattle with Expedia's search tool and vast selection of airlines.

 

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

Sunday is one of the best days to book for cheap flights from Sioux Falls to Seattle: 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 Seattle

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 Seattle in 2025. You can also book with separate airlines for your outbound and return journeys, from $127 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 Seattle 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 Seattle 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.

 

Frequently asked questions

How much does a flight from Sioux Falls Regional Airport (FSD) to Seattle - Tacoma Intl. Airport (SEA) cost?
Discover the latest flight deals from FSD to SEA by entering your preferred travel dates and searching on Expedia. Easily compare prices by departure date if you have flexibility with your schedule and use handy filters to explore prices for your preferred journey. As a member of One Key™, our free loyalty program, you can use Price Tracking to watch fares and receive notifications if prices go up or down.
What is the cheapest month to fly from FSD to SEA?
The cheapest flights from FSD to SEA are usually during off-peak season, when demand is lower. To save money, avoid flying during public holidays, school breaks and major local events.
What is the cheapest airline that flies from FSD to SEA?
Use the filter tool on Expedia to compare airlines and find the cheapest carrier that'll take you from FSD to SEA. Sort your results by "Price (lowest to highest)" to snap up a great deal.
How many flights per day from Sioux Falls Regional Airport (FSD) to Seattle - Tacoma Intl. Airport (SEA)?
There are no daily nonstop flights from Sioux Falls Regional Airport (FSD) to Seattle - Tacoma Intl. Airport (SEA). But you can opt for flights with layovers. Filter your search results on Expedia to include one or two stops, and you'll be cruising above the clouds in no time.
What day of the week has the most flights from FSD to SEA?
You'll usually find Tuesday the quietest day for flights, while Fridays are often the busiest.* However this can vary from season to season and during peak travel times or public holidays.*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 Seattle - Tacoma Intl. Airport (SEA)?
To avoid possible delays on the Sioux Falls Regional Airport (FSD) to Seattle - Tacoma Intl. Airport (SEA) route, aim to travel before 3 PM. Later departures are 22% more likely to be canceled.**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 Seattle - Tacoma Intl. Airport (SEA) last-minute?
Waiting until just before your departure to book your flight from FSD to SEA generally means paying more. While it's possible to find some last-minute offers, they aren't always guaranteed. Keep your travel schedule open to boost your chances of snagging a bargain.
Is it cheaper to book a FSD to SEA flight and hotel package?
You'll typically save money by booking a FSD to SEA 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 chosen your preferred flights and accommodations, consider adding extras such as car rentals, tours and activities.
Can I cancel or change the date of my flight from Sioux Falls Regional Airport (FSD) to Seattle - Tacoma Intl. Airport (SEA)?
In most instances, you're able to cancel or reschedule your FSD to SEA flight. However, additional charges may apply, especially if you booked over 24 hours ago. Check your itinerary for the airline's rules and fees on flight changes, or if you want more information, visit our Customer Service portal.

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*Available to One Key members.