$206 Cheap United flights Rapid City (RAP) to Seattle (SEA)

Use the “Price (lowest to highest)” filter on Expedia to search for cheap United Airlines round-trip flights from $351 from RAP to SEA. Affordable one-way options from $206 are also on offer.**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.

United Airlines flights to Seattle are typically cheaper in the low-season months of January and February. Whether you’re after a round-trip or one-way ticket, you could score a better deal then.

For cheap United Airlines fares from Rapid City Regional Airport (RAP) to Seattle - Tacoma Intl. Airport (SEA), start searching one to three months before your planned departure. Securing 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 the cost. Sunday is usually the cheapest, while Monday is often the most expensive for domestic flights. You can save 6% on average by booking your journey 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.

To figure out if there’s a direct trip from RAP to SEA with United Airlines or other carriers, check the “Nonstop” box when looking for tickets.

Browse United Airlines’s earliest flights from RAP to SEA by checking the “Morning” and “Early Morning” filters. Not only will you get to where you’re going 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.

United Airlines flights from Rapid City Regional Airport (RAP) to Seattle come in to Seattle - Tacoma Intl. Airport (SEA). This is the main entry point to this city.

A rewarding loyalty program and the ability to collect points through United Mileage Plus are the start of the reasons to jet off from RAP to SEA with United Airlines. Plus, when you sign up to our One Key™ program, you can receive 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.

Depending on your fare type, a fee is typically charged if you modify or cancel your flight more than 24 hours after it’s been confirmed. To find tickets with more flexibility, select our “Changes included” or “No cancel fee” filter when searching for flights. To learn more about changing or canceling your reservation, visit “Trips,” select your flight and click on “Manage Booking.”