$219 Cheap United flights Sioux Falls (FSD) to Seattle (SEA)

You can discover affordable return United Airlines flights from $343 from FSD to SEA by organizing your results from “Price (lowest to highest)” on Expedia. Or search for deals from $219 for a one-way trip.**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.

Search for one-way or return flights to Seattle in January or February. You could find a cheap fare with United Airlines during these quieter months.

Start searching one to three months ahead of your travel date to score cheaper fares on United Airlines flights from Sioux Falls Regional Airport (FSD) to Seattle - Tacoma Intl. Airport (SEA). You can save 25% by booking your domestic flight 34 to 86 days in advance versus last-minute reservations made 6 to 12 days out. You could also reduce costs by buying your fare on a Sunday, as it’s 6% cheaper on average than a Monday, the most expensive day to book.* Nail your timing, and you can enjoy significant savings on domestic journeys.*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.

To see if there’s a direct journey from FSD to SEA with United Airlines or other airlines, check the “Nonstop” filter when browsing for flights.

To find the earliest departure from FSD to SEA with United Airlines, filter your search by “Morning” and “Early Morning.” Booking an early flight usually means you’ll experience fewer cancellations.**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.

United Airlines flights from Sioux Falls Regional Airport (FSD) to Seattle arrive at Seattle - Tacoma Intl. Airport (SEA). This is the main gateway to this city.

Travel from FSD to SEA with United Airlines and you’ll enjoy a host of benefits including a rewarding loyalty program. When booking through Expedia as a United Mileage Plus and One Key™ member, you can also earn OneKeyCash™* to use on select future travel purchases.*OneKeyCash™ disclaimer - OneKeyCash™ is not redeemable for cash and can only be used on Expedia, Hotels.com and Vrbo.

Depending on the type of fare you purchased, a fee may apply if you cancel or reschedule your booking more than 24 hours after it’s confirmed. To secure plane tickets with more flexibility, select our “No cancel fee” or “Changes included” filter while looking for flights. To learn more about canceling or modifying your reservation, head to “Trips,” select your flight and tick “Manage Booking.”